DTC P0642:00 [PCM (SKYACTIV-D 2.2)]

DTC P0642:00	Constant voltage power supply circuit low input
DETECTION CONDITION	• When the following condition is met, the output voltage of the constant voltage (5 V) power supply terminal is less than 2.36 V for a continuous 0.5 s. ― Battery positive voltage: 8—16 V 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	• Limits the engine torque/limits the maximum engine speed. • Inhibits the automatic diesel particulate filter regeneration control. • Inhibits the intake shutter valve control. • Inhibits the manual diesel particulate filter regeneration control. • Inhibits the EGR control. • Stops the G-vectoring control (GVC). • Limits the engine transaxle total control. • Inhibits engine-stop by i-stop control.
POSSIBLE CAUSE	• APP sensor connector or terminal malfunction • CKP sensor connector or terminal malfunction • MAP sensor No.2 connector or terminal malfunction • Engine oil temperature/engine oil pressure sensor connector or terminal malfunction • MAF/IAT sensor No.1 connector or terminal malfunction • Power brake unit vacuum sensor connector or terminal malfunction • Refrigerant pressure sensor connector or terminal malfunction • Fuel pressure sensor (integrated with fuel injector No.1) connector or terminal malfunction • Fuel pressure sensor (integrated with fuel injector No.4) connector or terminal malfunction • Variable turbine geometry turbocharger actuator position sensor connector or terminal malfunction • EGR cooler bypass valve/EGR cooler bypass valve position sensor connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― APP sensor terminal A and PCM terminal 2AM ― CKP sensor terminal A and PCM terminal 1J ― MAP sensor No.2 terminal C and PCM terminal 1CN ― Engine oil temperature/engine oil pressure sensor terminal A and PCM terminal 1DN ― MAF/IAT sensor No.1 terminal D and PCM terminal 2AC ― Power brake unit vacuum sensor terminal A and PCM terminal 2BB ― Refrigerant pressure sensor terminal C and PCM terminal 2BB ― Fuel pressure sensor (integrated with fuel injector No.1) terminal C and PCM terminal 1M ― Fuel pressure sensor (integrated with fuel injector No.4) terminal C and PCM terminal 1N ― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E and PCM terminal 1BE ― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B and PCM terminal 1AU • PCM connector or terminal 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 constant voltage (5 V) power supply terminal is less than 2.36 V for a continuous 0.5 s.

― Battery positive voltage: 8—16 V

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

• Limits the engine torque/limits the maximum engine speed.

• Inhibits the automatic diesel particulate filter regeneration control.

• Inhibits the intake shutter valve control.

• Inhibits the manual diesel particulate filter regeneration control.

• Inhibits the EGR control.

• Stops the G-vectoring control (GVC).

• Limits the engine transaxle total control.

• Inhibits engine-stop by i-stop control.

POSSIBLE CAUSE

• APP sensor connector or terminal malfunction

• CKP sensor connector or terminal malfunction

• MAP sensor No.2 connector or terminal malfunction

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

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

• Power brake unit vacuum sensor connector or terminal malfunction

• Refrigerant pressure sensor connector or terminal malfunction

• Fuel pressure sensor (integrated with fuel injector No.1) connector or terminal malfunction

• Fuel pressure sensor (integrated with fuel injector No.4) connector or terminal malfunction

• Variable turbine geometry turbocharger actuator position sensor connector or terminal malfunction

• EGR cooler bypass valve/EGR cooler bypass valve position sensor connector or terminal malfunction

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

― APP sensor terminal A and PCM terminal 2AM

― CKP sensor terminal A and PCM terminal 1J

― MAP sensor No.2 terminal C and PCM terminal 1CN

― Engine oil temperature/engine oil pressure sensor terminal A and PCM terminal 1DN

― MAF/IAT sensor No.1 terminal D and PCM terminal 2AC

― Power brake unit vacuum sensor terminal A and PCM terminal 2BB

― Refrigerant pressure sensor terminal C and PCM terminal 2BB

― Fuel pressure sensor (integrated with fuel injector No.1) terminal C and PCM terminal 1M

― Fuel pressure sensor (integrated with fuel injector No.4) terminal C and PCM terminal 1N

― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E and PCM terminal 1BE

― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B and PCM terminal 1AU

• PCM connector or terminal malfunction

• PCM malfunction

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	VERIFY OTHER RELATED DTCs • Switch the ignition OFF, and then switch it ON (engine off). • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)]) • Has any DTC other than P0642:00 been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
No	Go to the next step.
3	INSPECT APP SENSOR CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the APP sensor connector • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
4	INSPECT CKP SENSOR CONNECTOR CONDITION • Disconnect the CKP sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
5	INSPECT MAP SENSOR NO.2 CONNECTOR CONDITION • Disconnect the MAP sensor No.2 connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
6	INSPECT ENGINE OIL TEMPERATURE/ENGINE OIL PRESSURE SENSOR CONNECTOR CONDITION • Disconnect the engine oil temperature/engine oil pressure sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
7	INSPECT MAF/IAT SENSOR NO.1 CONNECTOR CONDITION • Disconnect the MAF/IAT sensor No.1 connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
8	INSPECT POWER BRAKE UNIT VACUUM SENSOR CONNECTOR • Disconnect the power brake unit vacuum sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
9	INSPECT REFRIGERANT PRESSURE SENSOR CONNECTOR CONNECTION • Disconnect the Refrigerant pressure sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
10	INSPECT FUEL PRESSURE SENSOR (INTEGRATED WITH FUEL INJECTOR NO.1) CONNECTOR CONDITION • Disconnect the fuel pressure sensor (integrated with fuel injector No.1) connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
11	INSPECT FUEL PRESSURE SENSOR (INTEGRATED WITH FUEL INJECTOR NO.4) CONNECTOR CONDITION • Disconnect the fuel pressure sensor (integrated with fuel injector No.4) connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
12	INSPECT VARIABLE TURBINE GEOMETRY TURBOCHARGER ACTUATOR/VARIABLE TURBINE GEOMETRY TURBOCHARGER ACTUATOR POSITION SENSOR CONNECTOR CONDITION • Disconnect the variable turbine geometry turbocharger actuator position sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
13	INSPECT EGR COOLER BYPASS VALVE/EGR COOLER BYPASS VALVE POSITION SENSOR CONNECTOR CONDITION • Disconnect the EGR cooler bypass valve/EGR cooler bypass valve position sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
14	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
No	Repair or replace the connector, then go to Step 16.
15	INSPECT EACH POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Verify that the APP sensor, CKP sensor, MAP sensor No.2, engine oil temperature sensor/engine oil pressure sensor, MAF sensor/IAT sensor No.1, power brake unit vacuum sensor, Refrigerant pressure sensor, fuel pressure sensor (fuel injector No.1, 4 integrated), variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor, or EGR cooler bypass valve/EGR cooler bypass valve position sensor connector is disconnected. • Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground. ― APP sensor terminal A ― CKP sensor terminal A ― MAP sensor No.2 terminal C ― Engine oil temperature sensor/engine oil pressure sensor terminal A ― MAF/IAT sensor No.1 terminal D ― Power brake unit vacuum sensor terminal A ― Refrigerant pressure sensor terminal A ― Fuel pressure sensor (integrated with fuel injector No.1) terminal C ― Fuel pressure sensor (integrated with fuel injector No.4) terminal C ― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E ― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B • Is there continuity?	Yes	• Refer to the wiring diagram and verify if there is a common connector between the following terminals. ― APP sensor terminal A and PCM terminal 2AM ― CKP sensor terminal A and PCM terminal 1J ― MAP sensor No.2 terminal C and PCM terminal 1CN ― Engine oil temperature/engine oil pressure sensor terminal A and PCM terminal 1DN ― MAF/IAT sensor No.1 terminal D and PCM terminal 2AC ― Power brake unit vacuum sensor terminal C and PCM terminal 2BB ― Refrigerant pressure sensor terminal C and PCM terminal 2BB ― Fuel pressure sensor (integrated with fuel injector No.1) terminal C and PCM terminal 1M ― Fuel pressure sensor (integrated with fuel injector No.4) terminal C and PCM terminal 1N ― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E and PCM terminal 1BE ― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B and PCM terminal 1AU If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the wiring harness which is shorted to ground. • Go to the next step.
No	Go to the next step.
16	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)]) • Switch the ignition ON (engine off) and wait for 30 s. • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)]) • Has DTC P0642:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
No	Go to the next step.
17	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
No	DTC troubleshooting completed.

Step

Inspection

Results

Action

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

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

• Record the freeze frame data/snap shot data.

—

Go to the next step.

VERIFY OTHER RELATED DTCs

• Switch the ignition OFF, and then switch it ON (engine off).

• Display the DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)])

• Has any DTC other than P0642:00 been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)])

Go to the next step.

INSPECT APP SENSOR CONNECTOR CONDITION

• Switch the ignition OFF.

• Disconnect the APP sensor connector

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT CKP SENSOR CONNECTOR CONDITION

• Disconnect the CKP sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT MAP SENSOR NO.2 CONNECTOR CONDITION

• Disconnect the MAP sensor No.2 connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT ENGINE OIL TEMPERATURE/ENGINE OIL PRESSURE SENSOR CONNECTOR CONDITION

• Disconnect the engine oil temperature/engine oil pressure sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT MAF/IAT SENSOR NO.1 CONNECTOR CONDITION

• Disconnect the MAF/IAT sensor No.1 connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT POWER BRAKE UNIT VACUUM SENSOR CONNECTOR

• Disconnect the power brake unit vacuum sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT REFRIGERANT PRESSURE SENSOR CONNECTOR CONNECTION

• Disconnect the Refrigerant pressure sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT FUEL PRESSURE SENSOR (INTEGRATED WITH FUEL INJECTOR NO.1) CONNECTOR CONDITION

• Disconnect the fuel pressure sensor (integrated with fuel injector No.1) connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT FUEL PRESSURE SENSOR (INTEGRATED WITH FUEL INJECTOR NO.4) CONNECTOR CONDITION

• Disconnect the fuel pressure sensor (integrated with fuel injector No.4) connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT VARIABLE TURBINE GEOMETRY TURBOCHARGER ACTUATOR/VARIABLE TURBINE GEOMETRY TURBOCHARGER ACTUATOR POSITION SENSOR CONNECTOR CONDITION

• Disconnect the variable turbine geometry turbocharger actuator position sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT EGR COOLER BYPASS VALVE/EGR COOLER BYPASS VALVE POSITION SENSOR CONNECTOR CONDITION

• Disconnect the EGR cooler bypass valve/EGR cooler bypass valve position sensor connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT PCM CONNECTOR CONDITION

• Disconnect the PCM connector.

• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

• Is the connector normal?

Yes

Go to the next step.

Repair or replace the connector, then go to Step 16.

INSPECT EACH POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

• Verify that the APP sensor, CKP sensor, MAP sensor No.2, engine oil temperature sensor/engine oil pressure sensor, MAF sensor/IAT sensor No.1, power brake unit vacuum sensor, Refrigerant pressure sensor, fuel pressure sensor (fuel injector No.1, 4 integrated), variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor, or EGR cooler bypass valve/EGR cooler bypass valve position sensor connector is disconnected.

• Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.

― APP sensor terminal A

― CKP sensor terminal A

― MAP sensor No.2 terminal C

― Engine oil temperature sensor/engine oil pressure sensor terminal A

― MAF/IAT sensor No.1 terminal D

― Power brake unit vacuum sensor terminal A

― Refrigerant pressure sensor terminal A

― Fuel pressure sensor (integrated with fuel injector No.1) terminal C

― Fuel pressure sensor (integrated with fuel injector No.4) terminal C

― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E

― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B

• Is there continuity?

Yes

• Refer to the wiring diagram and verify if there is a common connector between the following terminals.

― APP sensor terminal A and PCM terminal 2AM

― CKP sensor terminal A and PCM terminal 1J

― MAP sensor No.2 terminal C and PCM terminal 1CN

― Engine oil temperature/engine oil pressure sensor terminal A and PCM terminal 1DN

― MAF/IAT sensor No.1 terminal D and PCM terminal 2AC

― Power brake unit vacuum sensor terminal C and PCM terminal 2BB

― Refrigerant pressure sensor terminal C and PCM terminal 2BB

― Fuel pressure sensor (integrated with fuel injector No.1) terminal C and PCM terminal 1M

― Fuel pressure sensor (integrated with fuel injector No.4) terminal C and PCM terminal 1N

― Variable turbine geometry turbocharger actuator/variable turbine geometry turbocharger actuator position sensor terminal E and PCM terminal 1BE

― EGR cooler bypass valve/EGR cooler bypass valve position sensor terminal B and PCM terminal 1AU

If there is a common connector:

― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.

― Repair or replace the malfunctioning location.

If there is no common connector:

― Repair or replace the wiring harness which is shorted to ground.

• Go to the next step.

Go to the next step.

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

• Reconnect all the disconnected connectors.

• Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.

(See CLEARING DTC [PCM (SKYACTIV-D 2.2)])

• Switch the ignition ON (engine off) and wait for 30 s.

• Display the DTCs using the M-MDS.

(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)])