DTC P026A:00 [SKYACTIV-D 1.5]

id0102q2416800

DTC P026A:00

Charge air cooler efficiency below threshold

DETECTION CONDITION

•  When the following conditions are met, the boost air temperature after passing through the charge air cooler exceeds 120 °C {248 °F} for a continuous 10 s.

MONITORING CONDITIONS

―  Vehicle speed: 30 km/h {19 mph} or more

―  Duty value of the electric water pump: 80 % or more

―  The amount of fluctuation in the boost air temperature before and after passing through the charge air cooler for the past 10 s: Within 50 °C {122 °F}

―  The following components are normal:

•  IAT sensor No.1

•  Battery

•  Electric water pump circuit

•  Vehicle speed signal

•  Intake shutter valve

•  HP-EGR control valve

•  LP-EGR control valve

•  Exhaust shutter valve

•  Exhaust gas reflux amount of EGR system

•  Turbocharger with variable turbine geometry

•  Speed sensor assy (turbocharger with variable turbine geometry)

•  MAP sensor

Diagnostic support note

•  This is an intermittent monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA is not available.

•  Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Restricts the upper limit of the engine speed.

•  Inhibits the EGR control.

•  Inhibits the auto diesel particulate filter regeneration control.

•  Inhibits the compulsory diesel particulate filter regeneration control.

•  Inhibits engine-stop by operating the i-stop function.

POSSIBLE CAUSE

•  Improper water-cooled charge air cooler coolant level

•  Restrict air flow at radiator core

•  Restrict air flow at water-cooled charge air cooler core

•  Electric water pump malfunction (Damage of internal impeller, stuck)

•  Water-cooled charge air cooler coolant passage clogged

•  Boost air temperature sensor malfunction

•  PCM malfunction

SYSTEM WIRING DIAGRAM

Not applicable

DTC P026A:00	Charge air cooler efficiency below threshold
DETECTION CONDITION	• When the following conditions are met, the boost air temperature after passing through the charge air cooler exceeds 120 °C {248 °F} for a continuous 10 s. MONITORING CONDITIONS ― Vehicle speed: 30 km/h {19 mph} or more ― Duty value of the electric water pump: 80 % or more ― The amount of fluctuation in the boost air temperature before and after passing through the charge air cooler for the past 10 s: Within 50 °C {122 °F} ― The following components are normal: • IAT sensor No.1 • Battery • Electric water pump circuit • Vehicle speed signal • Intake shutter valve • HP-EGR control valve • LP-EGR control valve • Exhaust shutter valve • Exhaust gas reflux amount of EGR system • Turbocharger with variable turbine geometry • Speed sensor assy (turbocharger with variable turbine geometry) • MAP sensor Diagnostic support note • This is an intermittent monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA is not available. • Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Restricts the upper limit of the engine speed. • Inhibits the EGR control. • Inhibits the auto diesel particulate filter regeneration control. • Inhibits the compulsory diesel particulate filter regeneration control. • Inhibits engine-stop by operating the i-stop function.
POSSIBLE CAUSE	• Improper water-cooled charge air cooler coolant level • Restrict air flow at radiator core • Restrict air flow at water-cooled charge air cooler core • Electric water pump malfunction (Damage of internal impeller, stuck) • Water-cooled charge air cooler coolant passage clogged • Boost air temperature sensor malfunction • PCM malfunction
SYSTEM WIRING DIAGRAM	Not applicable

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the snapshot data on the repair order.	—	Go to the next step.
2	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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 1.5].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
3		No	Go to the next step.
4	INSPECT WATER-COOLED CHARGE AIR COOLER COOLANT LEVEL • Perform the “WATER-COOLED CHARGE AIR COOLER COOLANT LEVEL INSPECTION”. (See WATER-COOLED CHARGE AIR COOLER COOLANT LEVEL INSPECTION [SKYACTIV-D 1.5].) • Is the coolant level within the specified?	Yes	Go to the next step.
4		No	Add water-cooled charge air cooler coolant, then go to Step 9.
5	INSPECT RADIATOR CORE CONDITION • Visually inspect the radiator core condition. • Is there damage or an object which obstructs cool airflow?	Yes	Repair or replace the malfunctioning part, then go to Step 9.
5		No	Go to the next step.
6	DETERMINE IF MALFUNCTION IS DUE TO ELECTRIC WATER PUMP STUCK • Access the PID/DATA monitor item E_WP and simulation item E_WP using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 1.5].) • Does the electric water pump operation sound change according to the simulation function operation?	Yes	Go to the next step.
6		No	Replace the electric water pump, then go to Step 9. (See ELECTRIC WATER PUMP REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
7	INSPECT BOOST AIR TEMPERATURE SENSOR • Inspect the boost air temperature sensor. (See BOOST AIR TEMPERATURE SENSOR INSPECTION [SKYACTIV-D 1.5].) • Is there any malfunction?	Yes	Go to the next step.
7		No	Replace the MAP sensor/boost air temperature sensor, then go to Step 9. (See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/BOOST AIR TEMPERATURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.5].)
8	INSPECT WATER-COOLED CHARGE AIR COOLER CORE CONDITION • Visually inspect the water-cooled charge air cooler core condition. • Is there damage or an object which prevents intake airflow?	Yes	Clean or replace water-cooled charge air cooler as necessary, then go to the next step.
8		No	Inspect restrict in water-cooled charge air cooler coolant passage. • If malfunction is detected: ― Repair or replace the malfunctioning part, then go to the next step. • If normal: ― Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [SKYACTIV-D 1.5].) • Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-D 1.5].) • Is the same DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [SKYACTIV-D 1.5].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-D 1.5].)
10		No	DTC troubleshooting completed.