DTC P0976 Primary Solenoid System B Circuit (Low): Wiring Diagram

Fig 1: Primary Solenoid System B Circuit Wiring Diagram (Low)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK HARNESS. Turn the ignition switch to OFF. Disconnect the TCM and transmission connectors. Measure the resistance between TCM connector and chassis ground. Connector & terminal (B54) No. 25 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 2 .	Repair the short circuit of harness.
2 CHECK PRIMARY DOWN SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal (T4) No. 1 - Transmission body:	Is the resistance approx. 13 Ω? (when engine cold)	Check for poor contact of the connector, and repair the fault location.	Go to step 3 .
3 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission oil pan. Check for the harness pinch, damage.	Is there any malfunction in harness?	Go to step 4 .	Replace the transmission harness.
4 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Measure the resistance between transmission connector and transmission body. Connector & terminal (T4) No. 1 - Transmission body:	Is the resistance 1 MΩ or more?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness.