DTC P0642:00 [SKYACTIV-D 1.5]

id0102q2315500

DTC P0642:00

Constant voltage power supply circuit low input

DETECTION CONDITION

•  When the following condition is met, the output voltage of the 5 V power supply terminal 4.63 V or less for a continuous 1 s:

MONITORING CONDITIONS

―  Battery voltage: 8 V or more

―  0.5 s have elapsed after the ignition was switched ON (engine off or on)

Diagnostic support note

•  This is a continuous monitor (CCM).

•  The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  PCM restricts engine torque.

•  Fully open the intake shutter valve.

•  Inhibits the EGR control.

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

POSSIBLE CAUSE

•  APP sensor connector or terminals malfunction

•  CKP sensor connector or terminals malfunction

•  MAP sensor/boost air temperature sensor connector or terminals malfunction

•  Engine oil temperature sensor/engine oil pressure sensor connector or terminals malfunction

•  MAF sensor/IAT sensor No.1 connector or terminals malfunction

•  Actuator position sensor (turbocharger with variable turbine geometry) connector or terminals malfunction

•  Power brake unit vacuum sensor connector or terminals malfunction

•  Refrigerant pressure sensor connector or terminals malfunction

•  Clutch stroke sensor connector or terminals malfunction

•  Exhaust shutter valve connector or terminals malfunction

•  Intake shutter valve connector or terminals malfunction

•  Exhaust gas pressure sensor No.1 connector or terminals malfunction

•  Exhaust gas pressure sensor No.2 connector or terminals malfunction

•  Coolant control valve connector or terminals malfunction

•  Speed sensor assy (turbocharger with variable turbine geometry) connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  APP sensor terminal A—PCM terminal 2AM

―  CKP sensor terminal A—PCM terminal 1J

―  MAP sensor/boost air temperature sensor terminal C—PCM terminal 1AZ

―  Engine oil temperature sensor/engine oil pressure sensor terminal A—PCM terminal 1BT

―  MAF sensor/IAT sensor No.1 terminal D—PCM terminal 2AI

―  Actuator position sensor (turbocharger with variable turbine geometry) terminal B—PCM terminal 1BJ

―  Power brake unit vacuum sensor terminal A—PCM terminal 2AK

―  Refrigerant pressure sensor terminal A—PCM terminal 2AR

―  Clutch stroke sensor terminal C—PCM terminal 2AL

―  Exhaust shutter valve terminal A—PCM terminal 1AK

―  Intake shutter valve terminal E—PCM terminal 1AU

―  Exhaust gas pressure sensor No.1 terminal A—PCM terminal 1CJ

―  Exhaust gas pressure sensor No.2 terminal A—PCM terminal 1AA

―  Coolant control valve terminal F—PCM terminal 1BO

―  Speed sensor assy (turbocharger with variable turbine geometry) terminal D—PCM terminal 1BI

•  PCM connector or terminals malfunction

•  PCM malfunction

DTC P0642:00	Constant voltage power supply circuit low input
DETECTION CONDITION	• When the following condition is met, the output voltage of the 5 V power supply terminal 4.63 V or less for a continuous 1 s: MONITORING CONDITIONS ― Battery voltage: 8 V or more ― 0.5 s have elapsed after the ignition was switched ON (engine off or on) Diagnostic support note • This is a continuous monitor (CCM). • The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• PCM restricts engine torque. • Fully open the intake shutter valve. • Inhibits the EGR control. • Inhibits engine-stop by operating the i-stop function.
POSSIBLE CAUSE	• APP sensor connector or terminals malfunction • CKP sensor connector or terminals malfunction • MAP sensor/boost air temperature sensor connector or terminals malfunction • Engine oil temperature sensor/engine oil pressure sensor connector or terminals malfunction • MAF sensor/IAT sensor No.1 connector or terminals malfunction • Actuator position sensor (turbocharger with variable turbine geometry) connector or terminals malfunction • Power brake unit vacuum sensor connector or terminals malfunction • Refrigerant pressure sensor connector or terminals malfunction • Clutch stroke sensor connector or terminals malfunction • Exhaust shutter valve connector or terminals malfunction • Intake shutter valve connector or terminals malfunction • Exhaust gas pressure sensor No.1 connector or terminals malfunction • Exhaust gas pressure sensor No.2 connector or terminals malfunction • Coolant control valve connector or terminals malfunction • Speed sensor assy (turbocharger with variable turbine geometry) connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― APP sensor terminal A—PCM terminal 2AM ― CKP sensor terminal A—PCM terminal 1J ― MAP sensor/boost air temperature sensor terminal C—PCM terminal 1AZ ― Engine oil temperature sensor/engine oil pressure sensor terminal A—PCM terminal 1BT ― MAF sensor/IAT sensor No.1 terminal D—PCM terminal 2AI ― Actuator position sensor (turbocharger with variable turbine geometry) terminal B—PCM terminal 1BJ ― Power brake unit vacuum sensor terminal A—PCM terminal 2AK ― Refrigerant pressure sensor terminal A—PCM terminal 2AR ― Clutch stroke sensor terminal C—PCM terminal 2AL ― Exhaust shutter valve terminal A—PCM terminal 1AK ― Intake shutter valve terminal E—PCM terminal 1AU ― Exhaust gas pressure sensor No.1 terminal A—PCM terminal 1CJ ― Exhaust gas pressure sensor No.2 terminal A—PCM terminal 1AA ― Coolant control valve terminal F—PCM terminal 1BO ― Speed sensor assy (turbocharger with variable turbine geometry) terminal D—PCM terminal 1BI • PCM connector or terminals malfunction • PCM malfunction

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 FREEZE FRAME DATA/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 APP SENSOR CONNECTOR CONDITION • Switch the ignition off. • Disconnect the APP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
4		No	Go to the next step.
5	INSPECT CKP SENSOR CONNECTOR CONDITION • Disconnect the CKP sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
5		No	Go to the next step.
6	INSPECT MAP SENSOR/BOOST AIR TEMPERATURE SENSOR CONNECTOR CONDITION • Disconnect the MAP sensor/boost air temperature sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
6		No	Go to the next step.
7	INSPECT ENGINE OIL TEMPERATURE SENSOR/ENGINE OIL PRESSURE SENSOR CONNECTOR CONDITION • Disconnect the engine oil temperature sensor/engine oil pressure sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
7		No	Go to the next step.
8	INSPECT MAF SENSOR/IAT SENSOR NO.1 CONNECTOR CONDITION • Disconnect the MAF sensor/IAT sensor No.1 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
8		No	Go to the next step.
9	INSPECT ACTUATOR POSITION SENSOR (TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY) CONNECTOR CONDITION • Disconnect the actuator position sensor (turbocharger with variable turbine geometry) connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
9		No	Go to the next step.
10	INSPECT POWER BRAKE UNIT VACUUM SENSOR CONNECTOR CONDITION • Disconnect the power brake unit vacuum sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
10		No	Go to the next step.
11	INSPECT REFRIGERANT PRESSURE SENSOR CONNECTOR CONDITION • Disconnect the refrigerant pressure sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
11		No	Go to the next step.
12	INSPECT CLUTCH STROKE SENSOR CONNECTOR CONDITION • Disconnect the clutch stroke sensor connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
12		No	Go to the next step.
13	INSPECT EXHAUST SHUTTER VALVE CONNECTOR CONDITION • Disconnect the exhaust shutter valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
13		No	Go to the next step.
14	INSPECT INTAKE SHUTTER VALVE CONNECTOR CONDITION • Disconnect the intake shutter valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
14		No	Go to the next step.
15	INSPECT EXHAUST GAS PRESSURE SENSOR NO.1 CONNECTOR CONDITION • Disconnect the exhaust gas pressure sensor No.1 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
15		No	Go to the next step.
16	INSPECT EXHAUST GAS PRESSURE SENSOR NO.2 CONNECTOR CONDITION • Disconnect the exhaust gas pressure sensor No.2 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
16		No	Go to the next step.
17	INSPECT COOLANT CONTROL VALVE CONNECTOR CONDITION • Disconnect the coolant control valve connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
17		No	Go to the next step.
18	INSPECT SPEED SENSOR ASSY (TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY) CONNECTOR CONDITION • Disconnect the speed sensor assy (turbocharger with variable turbine geometry) connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 21.
18		No	Go to the next step.
19	INSPECT EACH CONSTANT VOLTAGE POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Verify that the following connector parts are disconnected. ― APP sensor ― CKP sensor ― MAP sensor/boost air temperature sensor ― Engine oil temperature sensor/engine oil pressure sensor ― MAF sensor/IAT sensor No.1 ― Actuator position sensor (turbocharger with variable turbine geometry) ― Power brake unit vacuum sensor ― Refrigerant pressure sensor ― Clutch stroke sensor ― Exhaust shutter valve ― Intake shutter valve ― Exhaust gas pressure sensor No.1 ― Exhaust gas pressure sensor No.2 ― Coolant control valve ― Speed sensor assy (turbocharger with variable turbine geometry) • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― APP sensor terminal A ― CKP sensor terminal A ― MAP sensor/boost air temperature sensor terminal C ― Engine oil temperature sensor/engine oil pressure sensor terminal A ― MAF sensor/IAT sensor No.1 terminal D ― Actuator position sensor (turbocharger with variable turbine geometry) terminal B ― Power brake unit vacuum sensor terminal A ― Refrigerant pressure sensor terminal A ― Clutch stroke sensor terminal C ― Exhaust shutter valve terminal A ― Intake shutter valve terminal E ― Exhaust gas pressure sensor No.1 terminal A ― Exhaust gas pressure sensor No.2 terminal A ― Coolant control valve terminal F ― Speed sensor assy (turbocharger with variable turbine geometry) terminal D • Is there continuity?	Yes	Disconnect the PCM connector and inspect the wiring harness for short to ground. • If the short to ground circuit could be detected in the wiring harness: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • APP sensor terminal A—PCM terminal 2AM • CKP sensor terminal A—PCM terminal 1J • MAP sensor/boost air temperature sensor terminal C—PCM terminal 1AZ • Engine oil temperature sensor/engine oil pressure sensor terminal A—PCM terminal 1BT • MAF sensor/IAT sensor No.1 terminal D—PCM terminal 2AI • Actuator position sensor (turbocharger with variable turbine geometry) terminal B—PCM terminal 1BJ • Power brake unit vacuum sensor terminal A—PCM terminal 2AK • Refrigerant pressure sensor terminal A—PCM terminal 2AR • Clutch stroke sensor terminal C—PCM terminal 2AL • Exhaust shutter valve terminal A—PCM terminal 1AK • Intake shutter valve terminal E—PCM terminal 1AU • Exhaust gas pressure sensor No.1 terminal A—PCM terminal 1CJ • Exhaust gas pressure sensor No.2 terminal A—PCM terminal 1AA • Coolant control valve terminal F—PCM terminal 1BO • Speed sensor assy (turbocharger with variable turbine geometry) terminal D—PCM terminal 1BI If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • If the short to ground circuit could not be detected in the wiring harness: ― Replace the PCM (short to ground in the PCM internal circuit). (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.5].) Go to Step 21.
19		No	Go to the next step.
20	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to the next step.
20		No	Go to the next step.
21	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.
21		No	Go to the next step.
22	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].)
22		No	DTC troubleshooting completed.