DTC C0052 Motor Malfunction: Wiring Diagram

Fig 1: Motor Malfunction - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC TROUBLE CODE REFERENCE

Step	Check	Yes	No
1 CHECK MOTOR RELAY RESISTANCE . Turn the ignition switch to OFF. Remove the motor relay from the relay box. Measure the resistance between motor relay terminals. Terminals No. 12 - No. 13:	Is the resistance between 70 - 100 Ω?	Go to step 2 .	Replace the motor relay.
2 CHECK MOTOR RELAY CONTACT POINT . Connect the battery to motor relay terminals No. 13(+)and No. 12(-). Measure the resistance between motor relay terminals. Terminals No. 11 - No. 14:	Is the resistance less than 0.5 Ω?	Go to step 3 .	Replace the motor relay.
3 CHECK MOTOR RELAY SHORT . Measure the resistance between motor relay terminals. Terminals No. 12 - No. 11: No. 12 - No. 14:	Is the resistance more than 1 MΩ?	Go to step 4 .	Replace the motor relay.
4 CHECK FAIL SAFE RELAY RESISTANCE . Turn the ignition switch to OFF. Remove the fail safe relay from the relay box. Measure the resistance between fail safe relay terminals. Terminals No. 6 - No. 8:	Is the resistance between 80 - 130 Ω?	Go to step 5 .	Replace the fail safe relay.
5 CHECK THE FAIL SAFE RELAY CONTACT POINT . Connect the battery to motor relay terminals No. 6 (+) and No. 8(-). Measure the resistance between motor relay terminals. Terminals No. 9 - No. 10:	Is the resistance less than 0.5 Ω	Go to step 6 .	Replace the fail safe relay.
6 CHECK FAIL SAFE RELAY SHORT . Measure the resistance between motor relay terminals. Terminals No. 6 - No. 9: No. 6 - No. 10:	Is the resistance more than 1 MΩ?	Go to step 7 .	Replace the fail safe relay.
7 CHECK MOTOR RELAY POWER SUPPLY VOLTAGE . Disconnect the connectors (B423) and (VC1). Turn the ignition switch to ON. Measure the voltage between connector (B423) and chassis ground. Connector & terminal (B423) No. 5 (+) - Chassis ground (-):	Is the voltage 10 - 15 V?	Go to step 8 .	Repair the power supply circuit.
8 CHECK RELAY BOX . Measure the resistance between each terminal. Terminals (VC1) No. 5 - (VC2) No. 10: (VC1) No. 2 - (VC2) No. 6: (VC1) No. 2 - (VC2) No. 13: (VC1) No. 3 - (VC2) No. 8: (VC1) No. 1 - (VC2) No. 12: (VC1) No. 4 - (VC2) No. 11: (VC2) No. 9 - (VC2) No. 14:	Is the resistance less than 0.5 Ω?	Go to step 9 .	Replace the relay box.
9 CHECK HARNESS . Disconnect the connector from the VDCCM & H/U. Measure the resistance between VDCCM & H/U and relay box. Connector & terminal (B423) No. 3 - (B310) No. 31: (B423) No. 2 - (B310) No. 2: (B423) No. 1 - (B310) No. 30: (B423) No. 4 - (B310) No. 45:	Is the resistance less than 0.5 Ω?	Go to step 10 .	Repair the harness.
10 CHECK GROUND SHORT CIRCUIT OF HARNESS . Measure the resistance between harness and chassis ground. Connector & terminal (B423) No. 3 - Chassis ground: (B423) No. 2 - Chassis ground: (B423) No. 1 - Chassis ground: (B423) No. 4 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 11 .	Repair the harness.
11 CHECK GROUND CIRCUIT FOR MOTOR . Measure the resistance between VDCCM & H/U and chassis ground. Connector & terminal (B310) No. 46 - Chassis ground:	Is the resistance less than 0.5 Ω?	Go to step 12 .	Repair the harness.
12 CHECK POOR CONTACT OF CONNECTORS .	Is there poor contact in connector?	Repair the connector.	Go to step 13 .
13 CHECK THE VDCCM & H/U . Connect all the connectors and relays. Erase the memory. Perform the Inspection Mode. Read the DTC.	Is the same DTC displayed?	Replace the VDCCM & H/U. <Ref. to VDC CONTROL MODULE AND HYDRAULIC CONTROL UNIT (VDCCM & H/U) . >	Go to step 14 .
14 CHECK OTHER DTC DETECTION .	Is any other DTC displayed?	Perform the diagnosis according to DTC.	Temporary poor contact occurs.