DTC P0C0C: Drive Motor "A" Inverter Power Supply Circuit Low: Wiring Diagram

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Hybrid system < Ref. to WIRING DIAGRAM , Hybrid Electric Vehicle System.>

Fig 1: Drive Motor A Inverter Power Supply Circuit - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DTC PROCEDURE

Step	Check	Yes	No
1 CHECK RELAY. Using the Subaru Select Monitor, perform «Drive Motor Inverter power supply relay» of System Operation Check Mode for the drive motor control system. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, System Operation Check Mode.>	Does the relay operate?	Go to step 2 .	Go to step 3 .
2 CHECK CURRENT DATA. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the value of «Drive Motor Inverter Operation Update Counter». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>	Does the value change?	Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	Perform the diagnosis according to DTC P1C30. < Ref. to DTC P1C30 MANUFACTURER CONTROLLED DTC , Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
3 CHECK RELAY. Check the inverter power supply relay as a single unit. < Ref. to RELAY AND FUSE .>	Is the condition normal? (Check for continuity between terminals, damage, etc.)	Go to step 4 .	Replace the relay.
4 CHECK HARNESS (OPEN CIRCUIT). Turn the ignition switch to OFF. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.> Remove the service disconnect plug. < Ref. to SERVICE PLUG .> Wait for 10 minutes. Disconnect the DMCM connector. Remove the inverter power supply relay. Using a tester, measure the resistance between the inverter power supply relay and DMCM connector. Connector & terminal (R440) No. 10 - (R443) No. 24: (R440) No. 8 - (R443) No. 13: (R440) No. 8 - (R443) No. 26:	Is the resistance less than 1 Ω?	Go to step 5 .	Repair open circuit in harness between DMCM connector and inverter power supply relay connector, or repair the intermediate connector.
5 CHECK HARNESS (SHORT TO GROUND). Using a tester, measure the resistance between the inverter power supply relay and the ground bolt of inverter frame body. Connector & terminal (R440) No. 10 - Ground bolt of inverter frame body: (R440) No. 8 - Ground bolt of inverter frame body:	Is the resistance 1 MΩ or more?	Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.>	Repair short circuit to ground in harness between DMCM connector and inverter power supply relay connector or between inverter power supply relay and inverter connector, or repair the intermediate connector.