P0979

Diagnostic Chart:

Schematic:

Shift solenoid 3 is turned electrically ON/hydraulically open, relieving pressure from the M3 shift valve, during 1st, 2nd, 3rd, and reverse gear operation. Shift solenoid 3 is turned electrically OFF/hydraulic ON, applying pressure to M3 shift valve, during 4th and 5th gear operation. The transaxle control module (TCM) controls shift solenoid 3 by controlling an internal driver that pulls the solenoid circuit to voltage. During normal 3rd-4th gear shift operation, the TCM will turn OFF shift solenoid 3 and keep it OFF until a downshift to 3rd or lower gear occurs. Circuit 898 is monitored for low and high voltage feedback. DTC P0979 sets when shift solenoid 3 is commanded electrically ON and the feedback voltage at the TCM is low.

DTC PARAMETERS
DTC P0979 sets when shift solenoid 2 is commanded ON and the feedback voltage at the TCM is low and:
^ The engine is running
^ Transaxle Protection Mode is OFF
^ Shift solenoid 3 commanded ON
^ Condition exists for a least 500 ms

The TCM will command Transaxle Protection Mode ON if this DTC is active.

DTC P0979 is a type A DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use a Scan tool to monitor SHIFT SOLENOID 3 CKT STATUS with solenoid 3 commanded ON. Wiggling wires while watching for a change on SHIFT SOLENOID 3 CKT STATUS may locate the area where a short to ground in the wiring could lie.

Shift solenoid 3 resistance: 8.4-22.6 ohms