DTC P0171:00 [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]

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Note

• To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

• If the added fuel is 5 L {1 US gal, 1 Imp gal} or less, the PCM may not be able to determine the mixing proportion of the premium unleaded fuel and premium unleaded fuel (within E85) correctly and detects DTC P0171:00. (Premium unleaded fuel (within E85) compatible vehicles)

Details On DTCs

DESCRIPTION

Fuel trim system too lean

DETECTION CONDITION

Determination conditions

•  Any one of the following conditions is met:

―  The sum of the fuel feedback correction amount (SHRTFT1) and the fuel learning correction amount (LONGFT1) is the specified value (30 %) or more, and 10 s or more have elapsed with the fuel learning correction amount (LONGFT1) at the specified value (15 %) or more.

―  While the engine is idling or the vehicle is driven, the fuel feedback correction amount reaches the upper limit (25 % or more) for 20 s or more.

Preconditions

•  Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more^*1

^*1: Value can be verified by displaying PIDs using M-MDS

Malfunction determination period

•  10 s or 20 s period

Drive cycle

•  2

Self test type

•  CMDTC self test

Sensor used

•  A/F sensor

FAIL-SAFE FUNCTION

•  Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

•  Illuminates check engine light.

POSSIBLE CAUSE

•  Erratic signal to PCM

―  ECT sensor signal malfunction

―  MAF sensor signal malfunction

―  MAP sensor signal malfunction

―  IAT sensor No.2 signal malfunction

―  Related connector or terminals malfunction

―  Related wiring harness malfunction

•  High-pressure side fuel delivery system malfunction

―  Fuel pressure sensor malfunction

―  Relief valve (built-into high pressure fuel pump) malfunction

―  Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system)

―  Spill valve control solenoid valve (built-into high pressure fuel pump) malfunction

―  High pressure fuel pump malfunction

•  Fuel leakage in fuel line

•  Low-pressure side fuel delivery system malfunction

―  Fuel filter clogged (built-into fuel pump unit)

―  Low pressure side fuel line restriction (between fuel pump unit and high pressure fuel pump)

―  Fuel pump unit malfunction

―  Pressure regulator (built-into fuel pump unit) malfunction

―  Fuel pump control module malfunction

•  Fuel injector malfunction

―  Improper operation of fuel injector

―  Fuel injector related wiring harness malfunction

•  Improper operation of purge control system

―  Purge solenoid valve malfunction

―  Purge solenoid hoses improper connection

•  PCV valve malfunction

•  MAF sensor malfunction

•  Air cleaner element malfunction

•  MAP sensor malfunction

•  Air suction in intake air system

•  Improper operation of electric variable valve timing control system

―  Electric variable valve timing driver malfunction

―  Electric variable valve timing motor malfunction

―  Electric variable valve timing actuator malfunction

•  Improper operation of hydraulic variable valve timing control system

•  A/F sensor malfunction

―  A/F sensor loose

―  Exhaust system leakage

•  Poor fuel quality

•  PCM malfunction

DESCRIPTION	Fuel trim system too lean
DETECTION CONDITION	Determination conditions	• Any one of the following conditions is met: ― The sum of the fuel feedback correction amount (SHRTFT1) and the fuel learning correction amount (LONGFT1) is the specified value (30 %) or more, and 10 s or more have elapsed with the fuel learning correction amount (LONGFT1) at the specified value (15 %) or more. ― While the engine is idling or the vehicle is driven, the fuel feedback correction amount reaches the upper limit (25 % or more) for 20 s or more.
Preconditions	• Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more^1 ^1: Value can be verified by displaying PIDs using M-MDS
Malfunction determination period	• 10 s or 20 s period
Drive cycle	• 2
Self test type	• CMDTC self test
Sensor used	• A/F sensor
FAIL-SAFE FUNCTION	• Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• Illuminates check engine light.
POSSIBLE CAUSE	• Erratic signal to PCM ― ECT sensor signal malfunction ― MAF sensor signal malfunction ― MAP sensor signal malfunction ― IAT sensor No.2 signal malfunction ― Related connector or terminals malfunction ― Related wiring harness malfunction • High-pressure side fuel delivery system malfunction ― Fuel pressure sensor malfunction ― Relief valve (built-into high pressure fuel pump) malfunction ― Spill valve control solenoid valve control circuit malfunction (damage to driver in PCM caused by short circuit to ground system) ― Spill valve control solenoid valve (built-into high pressure fuel pump) malfunction ― High pressure fuel pump malfunction • Fuel leakage in fuel line • Low-pressure side fuel delivery system malfunction ― Fuel filter clogged (built-into fuel pump unit) ― Low pressure side fuel line restriction (between fuel pump unit and high pressure fuel pump) ― Fuel pump unit malfunction ― Pressure regulator (built-into fuel pump unit) malfunction ― Fuel pump control module malfunction • Fuel injector malfunction ― Improper operation of fuel injector ― Fuel injector related wiring harness malfunction • Improper operation of purge control system ― Purge solenoid valve malfunction ― Purge solenoid hoses improper connection • PCV valve malfunction • MAF sensor malfunction • Air cleaner element malfunction • MAP sensor malfunction • Air suction in intake air system • Improper operation of electric variable valve timing control system ― Electric variable valve timing driver malfunction ― Electric variable valve timing motor malfunction ― Electric variable valve timing actuator malfunction • Improper operation of hydraulic variable valve timing control system • A/F sensor malfunction ― A/F sensor loose ― Exhaust system leakage • Poor fuel quality • PCM malfunction

System Wiring Diagram

• Not applicable

Function Explanation (DTC Detection Outline)

• The PCM detects the oxygen concentration in the exhaust gas from the A/F sensor signal and performs fuel injection amount feedback to maintain the optimum air/fuel ratio. If a condition in which the feedback correction amount is large (fuel injection amount being increased) continues for the specified time, a feedback correction amount malfunction is determined, and a DTC is stored. The feedback correction amount has a “Fuel feedback correction amount” for the air/fuel ratio and a “Fuel learning correction amount” for fuel injector deterioration over time.

• “Fuel feedback correction amount (SHRTFT1)” and “Fuel learning correction amount (LONGFT1)” can be verified from the M-MDS PID item.

1. The sum of the fuel feedback correction amount (SHRTFT1) and the fuel learning correction amount (LONGFT1) is the specified value (30 %) or more, and 10 s or more have elapsed with the fuel learning correction amount (LONGFT1) at the specified value (15 %) or more.

Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more

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2. Fuel learning correction amount (LONGFT1) at specified value (25%) or more.

Engine coolant temperature: 0—45 °C {32—113 °F}, 60 °C {140 °F} or more

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Repeatability Verification Procedure

1. Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.

2. Start the engine and leave it idling for 1 min.

Note

• Match the engine coolant temperature in the recorded FREEZE FRAME DATA (Mode 2)/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.

3. Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the FREEZE FRAME DATA (Mode 2)/snapshot data.

Cause of Malfunction Verification Procedure (Premium Unleaded Fuel and Premium Unleaded Fuel (within E85)

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION

•  Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.

Note

•  Recording can be facilitated using the screen capture function of the PC.

2

PURPOSE: VERIFY FUEL AMOUNT WHEN DTC DETECTED

•  Verify the FLI of the FREEZE FRAME DATA (Mode 2).

•  Is the FLI value 30% or more?

Yes

Perform the DTC P0171:00 procedure.

No

Disconnect and connect the battery negative battery cable.

(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

Go to the next step.

3

PURPOSE: DETERMINE IF MALFUNCTION CAUSE IS THAT MIXING PROPORTION OF PREMIUN UNLEADED FUEL AND PREMIUM UNLEADED FUEL (WITHIN E85) CANNOT BE DETERMINED CORRECTLY

•  Implement the repeatability verification procedure.
(See Repeatability Verification Procedure.)

•  Perform the DTC Reading Procedure.
(See OBD ON-BOARD SYSTEM READINESS TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the DTC P0171:00 present?

Yes

Perform the DTC P0171:00 procedure.

No

If DTC is detected:

•  Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

If no DTC is detected:

•  DTC is output because the mixing proportion of premium unleaded fuel and premium unleaded fuel (within E85) cannot be determined correctly.

•  Explain the following refueling method to the customer.

―  It is recommended that premium unleaded fuel and premium unleaded fuel (within E85) should not be added alternately.

―  When changing the fuel type, refueling the tank to the extent possible (half of fuel tank capacity or more at minimum) with the different fuel is recommended.

―  Add more than 15 L {16 US qt, 14 Imp qt} of fuel when refueling.

―  Drive the vehicle for 10 km {6.3 mile} immediately after refueling so that the mixing proportion of premium unleaded fuel and premium unleaded fuel (within E85) is determined correctly.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step. Note • Recording can be facilitated using the screen capture function of the PC.
2	PURPOSE: VERIFY FUEL AMOUNT WHEN DTC DETECTED • Verify the FLI of the FREEZE FRAME DATA (Mode 2). • Is the FLI value 30% or more?	Yes	Perform the DTC P0171:00 procedure.
No	Disconnect and connect the battery negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) Go to the next step.
3	PURPOSE: DETERMINE IF MALFUNCTION CAUSE IS THAT MIXING PROPORTION OF PREMIUN UNLEADED FUEL AND PREMIUM UNLEADED FUEL (WITHIN E85) CANNOT BE DETERMINED CORRECTLY • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the DTC Reading Procedure. (See OBD ON-BOARD SYSTEM READINESS TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the DTC P0171:00 present?	Yes	Perform the DTC P0171:00 procedure.
No	If DTC is detected: • Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) If no DTC is detected: • DTC is output because the mixing proportion of premium unleaded fuel and premium unleaded fuel (within E85) cannot be determined correctly. • Explain the following refueling method to the customer. ― It is recommended that premium unleaded fuel and premium unleaded fuel (within E85) should not be added alternately. ― When changing the fuel type, refueling the tank to the extent possible (half of fuel tank capacity or more at minimum) with the different fuel is recommended. ― Add more than 15 L {16 US qt, 14 Imp qt} of fuel when refueling. ― Drive the vehicle for 10 km {6.3 mile} immediately after refueling so that the mixing proportion of premium unleaded fuel and premium unleaded fuel (within E85) is determined correctly.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item	Definition	Unit	Condition/Specification
APP	Accelerator pedal opening angle (relative value) with the fully released status as 0% and fully depressed status as 100%	%	• Accelerator pedal released: Approx. 0% • Accelerator pedal fully depressed: Approx. 100%
ECT	Engine coolant temperature	°C, °F	• Displays ECT
ECT	ECT sensor voltage	V	• ECT is 20 °C {68 °F}: Approx. 3.10 V • ECT is 40 °C {104 °F}: Approx. 2.16 V • ECT is 60 °C {140 °F}: Approx. 1.40 V • ECT is 80 °C {176 °F}: Approx. 0.87 V • ECT is 100 °C {212 °F}: Approx. 0.54 V
EVAPCP	Purge solenoid valve control duty value	%	• Idle (after warm up): 0% (Engine coolant temperature 59 °C {140 °F} or less) • Racing (Engine speed 2,000 rpm): 4.3—35% • Racing (Engine speed 4,000 rpm): Approx. 66%
FP	Fuel pump relay operation status	Off/On	• Ignition switched ON (engine off): Off • Cranking: On • Idle (after warm up): On
FUEL_PRES	Fuel pressure	KPa {MPa}, mBar {Bar}, psi, in H20	• Displays fuel pressure
FUEL_PRES	Fuel pressure sensor voltage	V	• Fuel pressure is 3.0 MPa {31 kgf/cm², 435 psi}: Approx. 0.92 V • Fuel pressure is 4.8 MPa {49 kgf/cm², 696 psi}: Approx. 1.17 V
IAT2	Intake air temperature (No.2) input from IAT sensor No.2	°C, °F	• Displays IAT (No.2)
IAT2	IAT sensor No.2 voltage	V	• IAT2 is 20 °C {68 °F}: Approx. 3.57 V • IAT2 is 40 °C {104 °F}: Approx. 2.70 V • IAT2 is 60 °C {140 °F}: Approx. 1.87 V
MAF	Mass air flow	g/Sec	• Displays MAF
MAF	MAF sensor voltage	V	• Ignition switched ON (engine off) (MAF: 0.59 g/s {0.078 lb/min}): Approx. 0.72 V • Idle (after warm up) (MAF: 2.17 g/s {0.287 lb/min}): Approx. 0.86 V • Racing (engine speed is 2,000 rpm) (MAF: 4.73 g/s {0.626 lb/min}): Approx. 1.07 V
MAP	Manifold absolute pressure	KPa {MPa}, mBar {Bar}, psi, in H20	• Displays MAP
MAP	MAP sensor voltage	V	• Ignition switched ON (engine off) (MAP:101 kPa {1.03 kgf/cm², 14.6 psi}): Approx. 4.07 V • Idle (after warm up) (MAP: 33 kPa {0.34 kgf/cm², 4.8 psi}): Approx. 1.34 V • Racing (engine speed is 2,000 rpm) (MAP: 26 kPa {0.27 kgf/cm², 3.8 psi}): Approx. 1.05 V
O2S11	A/F sensor current	µA	• Idle (after warm up): Approx. -39 µA • Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): Approx. 3.84 mA
TP_REL	Throttle valve opening angle (relative value) with value at throttle valve fully open timing as the start point	%	• Accelerator pedal released: Approx. 12% • Accelerator pedal fully depressed: Approx. 82%
VT_EX_ACT	Actual exhaust valve timing	°	• Displays actual exhaust valve timing
VT EX_DES	Desired exhaust valve timing	°	• Displays desired exhaust valve timing
VT IN_ACT	Actual intake valve timing	°	• Displays actual intake valve timing
VT IN_DES	Desired intake valve timing	°	• Displays desired intake valve timing

Simulation item table

Item	Definition	Unit	Operation
INJ_1	Fuel injector No.1	OFF	• Select OFF to forcibly stop fuel injector No.1.
INJ_2	Fuel injector No.2	OFF	• Select OFF to forcibly stop fuel injector No.2.
INJ_3	Fuel injector No.3	OFF	• Select OFF to forcibly stop fuel injector No.3.
INJ_4	Fuel injector No.4	OFF	• Select OFF to forcibly stop fuel injector No.4.

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY

•  Verify related Service Information availability.

•  Is any related Service Information available?

Yes

Perform repair or diagnosis according to the available Service Information.

•  If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)

•  Is the DTC P0171:00 on FREEZE FRAME DATA (Mode 2)?

Yes

Go to the next step.

No

Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).

(See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

3

PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION

•  Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?

Yes

Go to the next step.

No

Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step.

Note

•  Recording can be facilitated using the screen capture function of the PC.

4

PURPOSE: VERIFY IF INPUT SIGNAL TO PCM AFFECTS FUEL INJECTION

•  Start the engine.

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

―  ECT

―  APP

―  TP_REL

•  Is there any signal that is far out of specification?
(See PCM INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

Yes

Inspect the suspected sensor and related wiring harness.

•  If there is any malfunction:

―  Repair or replace the malfunctioning part.

―  Go to the troubleshooting procedure to perform the procedure from Step 20.

•  If there is no malfunction:

―  Go to the next step.

No

Go to the next step.

5

PURPOSE: VERIFY CONNECTOR CONNECTIONS

•  Start the engine.

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

―  FUEL_PRES

―  FP

―  EVAPCP

―  MAF

―  MAP

―  IAT2

―  VT_EX_ACT

―  VT IN_ACT

•  When the following parts are shaken, does the PID value include a PID item which has changed?

―  Fuel pressure sensor

―  Fuel pump control module

―  Purge solenoid valve

―  MAF sensor

―  MAP sensor/IAT sensor No.2

―  OCV

―  Electric variable valve timing motor/driver

―  PCM

Yes

Repair or replace the applicable connector parts.

Go to the troubleshooting procedure to perform the procedure from Step 20.

No

Go to the next step.

6

PURPOSE: VERIFY FUEL PRESSURE (HIGH-SIDE) MALFUNCTION

•  Switch the ignition off.

•  Reconnect all disconnected connectors.

•  Start the engine and idle it.

•  Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm², 435 psi}?

Yes

Go to the next step.

No

FUEL_PRES PID value is lower than 3 MPa {31 kgf/cm², 435 psi}:

•  Go to the troubleshooting procedure to perform the procedure from Step 1.

FUEL_PRES PID value is higher than 3 MPa {31 kgf/cm², 435 psi}:

•  Go to Step 8.

7

PURPOSE: VERIFY FUEL PRESSURE (LOW-SIDE) MALFUNCTION

Note

•  Verify the fuel pressure on the low pressure side with the operation of the high pressure fuel pump turned off.

•  Bleed the remaining pressure in the fuel line using the following procedure.

1.  Switch the ignition off.

2.  Disconnect the high pressure fuel pump connector.

3.  Disconnect the fuel pump relay.

4.  Start the engine and wait until the engine stalls.

•  Switch the ignition off.

•  Install the fuel pump relay.

•  Switch the ignition ON (engine off).

•  Display PID FUEL_PRES and simulation item FP using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Turn simulation item FP on.

•  Is the FUEL_PRES PID value 430 kPa {4.38 kgf/cm², 62.4 psi} or more?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 5.

8

PURPOSE: VERIFY IF MALFUNCTION CAUSED BY FUEL INJECTOR IMPROPER OPERATION

•  Switch the ignition off.

•  Reconnect all disconnected connectors.

•  Start the engine and idle it.

•  Access the following simulation items using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

―  INJ_1

―  INJ_2

―  INJ_3

―  INJ_4

•  Turn each fuel injector from on to off using the simulation items.

•  Does the vibration during idling worsen?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 7.

9

PURPOSE: VERIFY IF MALFUNCTION CAUSED BY PURGE SOLENOID VALVE IMPROPER OPERATION

•  Start the engine and idle it.

•  Access the EVAPCP PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the EVAPCP PID value normal?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 8.

10

PURPOSE: VERIFY MAF SENSOR

•  Start the engine and idle it.

•  Access the MAF PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the MAF PID value normal?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 10.

11

PURPOSE: VERIFY MAP SENSOR

•  Start the engine and idle it.

•  Access the MAP PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the MAP PID value normal?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 12.

12

PURPOSE: VERIFY INTAKE VALVE TIMING

•  Start the engine and idle it.

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

―  VT IN_ACT

―  VT IN_DES

•  Depress the accelerator pedal to increase the engine speed.

•  Does the monitor value of the PID item VT IN_ACT conform to the VT IN_DES PID value?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 14.

13

PURPOSE: VERIFY EXHAUST VALVE TIMING

•  Start the engine and idle it.

•  Access the following PIDs using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

―  VT_EX_ACT

―  VT EX_DES

•  Perform the following:

1.  Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.

2.  Shift to 2nd gear (MTX)/D position (ATX) and rapidly accelerate the vehicle to 50 km/h {31 mph} (to operate hydraulic variable valve timing control).

3.  Decelerate to idling.

4.  Shift to 2nd gear (MTX)/D position (ATX) and rapidly accelerate the vehicle to 50 km/h {31 mph} again.

•  Does the monitor value of the PID item VT_EX_ACT conform to the VT EX_DES PID value?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 17.

14

PURPOSE: VERIFY A/F SENSOR

•  Access the O2S11 PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the O2S11 PID value normal?

Yes

Go to the next step.

No

Go to the troubleshooting procedure to perform the procedure from Step 18.

15

PURPOSE: VERIFY DTC

•  Switch the ignition off, then ON (engine off).

•  Retrieve the PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

Go to the troubleshooting procedure to perform the procedure from Step 1.

No

Go to the troubleshooting procedure to perform the procedure from Step 1.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2) • Is the DTC P0171:00 on FREEZE FRAME DATA (Mode 2)?	Yes	Go to the next step.
No	Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2). (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
3	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION • Has the FREEZE FRAME DATA (Mode 2)/snapshot data been recorded?	Yes	Go to the next step.
No	Record the FREEZE FRAME DATA (Mode 2)/snapshot data on the repair order, then go to the next step. Note • Recording can be facilitated using the screen capture function of the PC.
4	PURPOSE: VERIFY IF INPUT SIGNAL TO PCM AFFECTS FUEL INJECTION • Start the engine. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) ― ECT ― APP ― TP_REL • Is there any signal that is far out of specification? (See PCM INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)	Yes	Inspect the suspected sensor and related wiring harness. • If there is any malfunction: ― Repair or replace the malfunctioning part. ― Go to the troubleshooting procedure to perform the procedure from Step 20. • If there is no malfunction: ― Go to the next step.
No	Go to the next step.
5	PURPOSE: VERIFY CONNECTOR CONNECTIONS • Start the engine. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) ― FUEL_PRES ― FP ― EVAPCP ― MAF ― MAP ― IAT2 ― VT_EX_ACT ― VT IN_ACT • When the following parts are shaken, does the PID value include a PID item which has changed? ― Fuel pressure sensor ― Fuel pump control module ― Purge solenoid valve ― MAF sensor ― MAP sensor/IAT sensor No.2 ― OCV ― Electric variable valve timing motor/driver ― PCM	Yes	Repair or replace the applicable connector parts. Go to the troubleshooting procedure to perform the procedure from Step 20.
No	Go to the next step.
6	PURPOSE: VERIFY FUEL PRESSURE (HIGH-SIDE) MALFUNCTION • Switch the ignition off. • Reconnect all disconnected connectors. • Start the engine and idle it. • Access the FUEL_PRES PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the FUEL_PRES PID value approx. 3 MPa {31 kgf/cm², 435 psi}?	Yes	Go to the next step.
No	FUEL_PRES PID value is lower than 3 MPa {31 kgf/cm², 435 psi}: • Go to the troubleshooting procedure to perform the procedure from Step 1. FUEL_PRES PID value is higher than 3 MPa {31 kgf/cm², 435 psi}: • Go to Step 8.
7	PURPOSE: VERIFY FUEL PRESSURE (LOW-SIDE) MALFUNCTION Note • Verify the fuel pressure on the low pressure side with the operation of the high pressure fuel pump turned off. • Bleed the remaining pressure in the fuel line using the following procedure. 1. Switch the ignition off. 2. Disconnect the high pressure fuel pump connector. 3. Disconnect the fuel pump relay. 4. Start the engine and wait until the engine stalls. • Switch the ignition off. • Install the fuel pump relay. • Switch the ignition ON (engine off). • Display PID FUEL_PRES and simulation item FP using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Turn simulation item FP on. • Is the FUEL_PRES PID value 430 kPa {4.38 kgf/cm², 62.4 psi} or more?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 5.
8	PURPOSE: VERIFY IF MALFUNCTION CAUSED BY FUEL INJECTOR IMPROPER OPERATION • Switch the ignition off. • Reconnect all disconnected connectors. • Start the engine and idle it. • Access the following simulation items using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) ― INJ_1 ― INJ_2 ― INJ_3 ― INJ_4 • Turn each fuel injector from on to off using the simulation items. • Does the vibration during idling worsen?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 7.
9	PURPOSE: VERIFY IF MALFUNCTION CAUSED BY PURGE SOLENOID VALVE IMPROPER OPERATION • Start the engine and idle it. • Access the EVAPCP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the EVAPCP PID value normal?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 8.
10	PURPOSE: VERIFY MAF SENSOR • Start the engine and idle it. • Access the MAF PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the MAF PID value normal?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 10.
11	PURPOSE: VERIFY MAP SENSOR • Start the engine and idle it. • Access the MAP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the MAP PID value normal?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 12.
12	PURPOSE: VERIFY INTAKE VALVE TIMING • Start the engine and idle it. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) ― VT IN_ACT ― VT IN_DES • Depress the accelerator pedal to increase the engine speed. • Does the monitor value of the PID item VT IN_ACT conform to the VT IN_DES PID value?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 14.
13	PURPOSE: VERIFY EXHAUST VALVE TIMING • Start the engine and idle it. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) ― VT_EX_ACT ― VT EX_DES • Perform the following: 1. Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more. 2. Shift to 2nd gear (MTX)/D position (ATX) and rapidly accelerate the vehicle to 50 km/h {31 mph} (to operate hydraulic variable valve timing control). 3. Decelerate to idling. 4. Shift to 2nd gear (MTX)/D position (ATX) and rapidly accelerate the vehicle to 50 km/h {31 mph} again. • Does the monitor value of the PID item VT_EX_ACT conform to the VT EX_DES PID value?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 17.
14	PURPOSE: VERIFY A/F SENSOR • Access the O2S11 PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the O2S11 PID value normal?	Yes	Go to the next step.
No	Go to the troubleshooting procedure to perform the procedure from Step 18.
15	PURPOSE: VERIFY DTC • Switch the ignition off, then ON (engine off). • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) Go to the troubleshooting procedure to perform the procedure from Step 1.
No	Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure

• Step 1—7

― Perform a fuel injector control system inspection.

• Step 8—9

― Perform an emission system parts inspection.

• Step 10—13

― Perform an intake air system parts inspection.

• Step 14—17

― Perform a valve timing inspection.

• Step 18—19

― Perform an exhaust system parts inspection.

• Step 20

― Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION

1

PURPOSE: VERIFY IF CAUSE OF MALFUNCTION IS RELATED TO LACK OF FUEL

•  Verify the remaining amount of fuel.

•  Is there a lack of fuel?

Yes

Refill the fuel, then go to Step 20.

No

Go to the next step.

2

PURPOSE: DETERMINE INTEGRITY OF FUEL PRESSURE SENSOR

•  Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the fuel distributor, then go to Step 20.

(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

3

PURPOSE: DETERMINE INTEGRITY OF HIGH PRESSURE FUEL PUMP

•  Inspect the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the high pressure fuel pump, then go to Step 20.

(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

4

PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS

•  Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction.

•  Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.

No

Go to the next step.

5

PURPOSE: DETERMINE INTEGRITY OF FUEL PUMP CONTROL MODULE

•  Inspect the fuel pump control module.
(See FUEL PUMP CONTROL MODULE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the fuel pump control module, then go to Step 20.

(See FUEL PUMP CONTROL MODULE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

6

PURPOSE: DETERMINE INTEGRITY OF FUEL PUMP UNIT

•  Inspect the fuel pump unit.
(See FUEL PUMP UNIT INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the fuel pump unit, then go to Step 20.

(See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

7

PURPOSE: DETERMINE INTEGRITY OF FUEL INJECTOR

•  Inspect the fuel injector.
(See FUEL INJECTOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the fuel injector, then go to Step 20.

(See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

8

PURPOSE: DETERMINE INTEGRITY OF PURGE SOLENOID VALVE

•  Inspect the purge solenoid valve.
(See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the purge solenoid valve, then go to Step 20.

(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

9

PURPOSE: DETERMINE INTEGRITY OF PCV VALVE

•  Inspect the PCV valve.
(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

Yes

Replace the PCV valve, then go to Step 20.

(See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

10

PURPOSE: DETERMINE INTEGRITY OF MAF SENSOR

•  Inspect the MAF sensor.
(See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the MAF sensor/IAT sensor No.1, then go to Step 20.

(See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

11

PURPOSE: VERIFY IF MALFUNCTION RELATED TO AIR CLEANER ELEMENT AFFECTS MEASUREMENT OF INTAKE AIR AMOUNT

•  Inspect the air cleaner element.
(See AIR CLEANER ELEMENT INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the air cleaner element, then go to Step 20.

(See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

12

PURPOSE: DETERMINE INTEGRITY OF MAP SENSOR

•  Reconnect all disconnected connectors.

•  Inspect the MAP sensor.
(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the MAP sensor/IAT sensor No.2, then go to Step 20.

(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

13

PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE AIR SYSTEM AFFECTS DIAGNOSTIC RESULTS

•  Visually inspect for loose, cracked or damaged hoses on intake air system.

•  Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.

No

Go to the next step.

14

PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING DRIVER

•  Inspect the electric variable valve timing driver.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the electric variable valve timing motor/driver, then go to Step 20.

(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

15

PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING MOTOR

•  Inspect the electric variable valve timing motor.
(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the electric variable valve timing motor/driver, then go to Step 20.

(See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

16

PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING ACTUATOR

•  Inspect the electric variable valve timing actuator.
(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the electric variable valve timing actuator, then go to Step 20.

(See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

17

PURPOSE: DETERMINE INTEGRITY OF OCV

•  Inspect the OCV.
(See OIL CONTROL VALVE (OCV) INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the OCV, then go to Step 20.

(See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

18

PURPOSE: DETERMINE INTEGRITY OF A/F SENSOR

•  Inspect the A/F sensor.
(See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is there any malfunction?

Yes

Replace the A/F sensor, then go to Step 20.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

No

Go to the next step.

19

PURPOSE: VERIFY IF MALFUNCTION RELATED TO EMISSION SYSTEM AFFECTS HO2S SIGNAL

•  Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S)

•  Is there any malfunction?

Yes

Repair or replace the malfunctioning part according to the inspection results, then go to the next step.

No

Go to the next step.

20

PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

•  Always reconnect all disconnected connectors.

•  Clear the DTC from the PCM memory using the M-MDS.
(See CLEARING DTC [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Implement the repeatability verification procedure.
(See Repeatability Verification Procedure.)

•  Perform the Pending Trouble Code Access Procedure.
(See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Is the PENDING CODE for this DTC present?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

Go to the next step.

No

DTC troubleshooting completed.

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY IF CAUSE OF MALFUNCTION IS RELATED TO LACK OF FUEL • Verify the remaining amount of fuel. • Is there a lack of fuel?	Yes	Refill the fuel, then go to Step 20.
1		No	Go to the next step.
2	PURPOSE: DETERMINE INTEGRITY OF FUEL PRESSURE SENSOR • Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the fuel distributor, then go to Step 20. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
2		No	Go to the next step.
3	PURPOSE: DETERMINE INTEGRITY OF HIGH PRESSURE FUEL PUMP • Inspect the high pressure fuel pump. (See HIGH PRESSURE FUEL PUMP INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the high pressure fuel pump, then go to Step 20. (See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
3		No	Go to the next step.
4	PURPOSE: VERIFY IF MALFUNCTION RELATED TO FUEL LEAK FROM FUEL SYSTEM OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS • Inspect the fuel system pipes (low to high pressure sides) for fuel leakage and restriction. • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
4		No	Go to the next step.
5	PURPOSE: DETERMINE INTEGRITY OF FUEL PUMP CONTROL MODULE • Inspect the fuel pump control module. (See FUEL PUMP CONTROL MODULE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the fuel pump control module, then go to Step 20. (See FUEL PUMP CONTROL MODULE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
5		No	Go to the next step.
6	PURPOSE: DETERMINE INTEGRITY OF FUEL PUMP UNIT • Inspect the fuel pump unit. (See FUEL PUMP UNIT INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the fuel pump unit, then go to Step 20. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
6		No	Go to the next step.
7	PURPOSE: DETERMINE INTEGRITY OF FUEL INJECTOR • Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the fuel injector, then go to Step 20. (See FUEL INJECTOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
7		No	Go to the next step.
8	PURPOSE: DETERMINE INTEGRITY OF PURGE SOLENOID VALVE • Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the purge solenoid valve, then go to Step 20. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
8		No	Go to the next step.
9	PURPOSE: DETERMINE INTEGRITY OF PCV VALVE • Inspect the PCV valve. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)	Yes	Replace the PCV valve, then go to Step 20. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
9		No	Go to the next step.
10	PURPOSE: DETERMINE INTEGRITY OF MAF SENSOR • Inspect the MAF sensor. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the MAF sensor/IAT sensor No.1, then go to Step 20. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
10		No	Go to the next step.
11	PURPOSE: VERIFY IF MALFUNCTION RELATED TO AIR CLEANER ELEMENT AFFECTS MEASUREMENT OF INTAKE AIR AMOUNT • Inspect the air cleaner element. (See AIR CLEANER ELEMENT INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the air cleaner element, then go to Step 20. (See AIR CLEANER ELEMENT REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
11		No	Go to the next step.
12	PURPOSE: DETERMINE INTEGRITY OF MAP SENSOR • Reconnect all disconnected connectors. • Inspect the MAP sensor. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the MAP sensor/IAT sensor No.2, then go to Step 20. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
12		No	Go to the next step.
13	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE AIR SYSTEM AFFECTS DIAGNOSTIC RESULTS • Visually inspect for loose, cracked or damaged hoses on intake air system. • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 20.
13		No	Go to the next step.
14	PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING DRIVER • Inspect the electric variable valve timing driver. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the electric variable valve timing motor/driver, then go to Step 20. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
14		No	Go to the next step.
15	PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING MOTOR • Inspect the electric variable valve timing motor. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the electric variable valve timing motor/driver, then go to Step 20. (See ELECTRIC VARIABLE VALVE TIMING MOTOR/DRIVER REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
15		No	Go to the next step.
16	PURPOSE: DETERMINE INTEGRITY OF ELECTRIC VARIABLE VALVE TIMING ACTUATOR • Inspect the electric variable valve timing actuator. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the electric variable valve timing actuator, then go to Step 20. (See ELECTRIC VARIABLE VALVE TIMING ACTUATOR, HYDRAULIC VARIABLE VALVE TIMING ACTUATOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
16		No	Go to the next step.
17	PURPOSE: DETERMINE INTEGRITY OF OCV • Inspect the OCV. (See OIL CONTROL VALVE (OCV) INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the OCV, then go to Step 20. (See OIL CONTROL VALVE (OCV) REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
17		No	Go to the next step.
18	PURPOSE: DETERMINE INTEGRITY OF A/F SENSOR • Inspect the A/F sensor. (See AIR FUEL RATIO (A/F) SENSOR INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the A/F sensor, then go to Step 20. (See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
18		No	Go to the next step.
19	PURPOSE: VERIFY IF MALFUNCTION RELATED TO EMISSION SYSTEM AFFECTS HO2S SIGNAL • Verify the exhaust gas leakage from the exhaust system. (between A/F sensor and HO2S) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
19		No	Go to the next step.
20	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) • Is the PENDING CODE for this DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) Go to the next step.
20		No	DTC troubleshooting completed.