DTC P0763 Shift Solenoid "C" Electrical

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Output signal circuit of high clutch duty solenoid is open or shorted.

TROUBLE SYMPTOM:

Excessive shift shock

WIRING DIAGRAM:

Fig 1: Wiring Diagram - Shift Solenoid "C" Electrical

Courtesy of SUBARU OF AMERICA, INC.

DTC P0763 DIAGNOSTIC PROCEDURE

Step	CHECK	Yes	No
1 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Turn the ignition switch to OFF. Disconnect the connector from TCM and transmission. Measure the resistance of harness between TCM and transmission connector. Connector & terminal (B55) No. 8 - (B11) No. 7:	Is the resistance less than 1 Ω?	Go to step 2 .	Repair the open circuit in harness between TCM and transmission connector.
2 CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION. Measure the resistance of harness connector between TCM and chassis ground. Connector & terminal (B55) No. 8 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 3 .	Repair the short circuit in harness between TCM and transmission connector.
3 CHECK HIGH CLUTCH DUTY SOLENOID. Measure the resistance between transmission connector receptacle's terminals. Connector & terminal (T4) No. 7 - No. 20:	Is the resistance 2.0 - 6.0 Ω?	Go to step 4 .	Go to step 7 .
4 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. Connect the connectors to TCM and transmission. Lift-up the vehicle and support with rigid racks. NOTE: Raise all wheels off floor. Connect the Subaru Select Monitor to data link connector. Start the engine, and turn the Subaru Select Monitor switch to ON. Start the engine and warm-up the engine until the ATF temperature is above 80°C (176°F). NOTE: If the ambient temperature is below 0°C (32°F), drive the vehicle until the ATF reaches its operating temperature. Read the data of "High Clutch Duty Ratio" using Subaru Select Monitor. High clutch duty solenoid is indicated in "%". Shift the select lever to "D", and slowly increase vehicle speed at 3rd or 4th to measure. NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE . >	Is the value 0%?	Go to step 5.	Go to step 6.
5 CHECK OUTPUT SIGNAL EMITTED FROM TCM USING SUBARU SELECT MONITOR. Return the engine to idling speed and shift the select lever to "N" range. NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE . >	Is the value 100%?	Even if the SPORT indicator light is blinking, the circuit has returned to normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in TCM and transmission.	Go to step 6.
6 CHECK POOR CONTACT.	Is there poor contact in high clutch duty solenoid circuit?	Repair the poor contact.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
7 CHECK HIGH CLUTCH DUTY SOLENOID (IN TRANSMISSION). Remove the transmission connector from bracket. Drain the ATF. CAUTION: Do not drain the ATF until it cools down. Remove the oil pan, and disconnect the connector from control valve body. Measure the resistance between high clutch duty solenoid connector and transmission ground. Connector & terminal (AT3) No. 3 - Transmission ground:	Is the resistance 2.0 - 6.0 Ω?	Go to step 8 .	Replace the control valve body. < Ref. to CONTROL VALVE BODY . >
8 CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION. Measure the resistance of harness between high clutch duty solenoid and transmission connector. Connector & terminal (T4) No. 7 - (AT3) No. 3:	Is the resistance less than 1 Ω?	Go to step 9 .	Repair the open circuit in harness between TCM and transmission connector.
9 CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION. Measure the resistance of harness between transmission connector and transmission ground. Connector & terminal (T4) No. 7 - Transmission ground:	Is the resistance more than 1 MΩ?	Even if the SPORT indicator light is blinking, the circuit has returned to normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in high clutch duty solenoid and transmission.	Repair the short circuit of harness between high clutch duty solenoid and transmission connector.