DTC P0977 Primary Solenoid System B Circuit (High): Wiring Diagram

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

CVT Control System. See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: CVT Control System - Wiring Diagram (Primary Solenoid System B)

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

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 transmission connectors. Connector & terminal (B54) No. 25 - (B11) No. 3:	Is the resistance less than 1 Ω?	Go to step 2 .	Repair the open circuit of harness.
2 CHECK HARNESS. Turn the ignition switch to ON. Measure the voltage between TCM connector and chassis ground. Connector & terminal (B54) No. 25 (+) - Chassis ground (-):	Is the voltage approx. 0 V?	Go to step 3 .	Repair the short circuit of harness.
3 CHECK PRIMARY DOWN SOLENOID. Measure the resistance between transmission connector and transmission body. Connector & terminal (T4) No. 3 - Transmission body:	Is the resistance approx. 13 Ω? (when engine cold)	Check for poor contact of the connector, and repair the defective part.	Go to step 4 .
4 CHECK HARNESS INSIDE TRANSMISSION. CAUTION: Start work after ATF cools down. Remove the transmission valve cover. Check for the harness pinch, damage.	Is the harness normal?	Go to step 5 .	Replace the transmission harness.
5 CHECK HARNESS INSIDE TRANSMISSION. Disconnect the control valve body connector. Turn the ignition switch to ON. Measure the voltage between transmission connector and transmission body. Connector & terminal (T4) No. 3 (+) - Transmission body (-):	Is the voltage approx. 0 V?	Replace the control valve body. Refer to CONTROL VALVE BODY .	Replace the transmission harness.