P0973

Diagnostic Chart:

Schematic:

Shift solenoid 1 is turned electrically ON/hydraulically closed, applying pressure to the M1 shift valve, during 1st gear operation. The transaxle control module (TCM) controls shift solenoid 1 by controlling an internal driver that pulls the solenoid circuit to voltage. During normal 1st, 2nd gear shift operation, the TCM will turn shift solenoid 1 OFF and keep it OFF until a downshift to 1st gear occurs. Circuit 1222 is monitored for low and high voltage feedback. DTC P0973 sets if shift solenoid 1 is commanded ON and the feedback voltage at the TCM is low.

DTC PARAMETERS
DTC P0973 sets if low voltage is detected on the shift solenoid 1 control circuit and:
^ The engine is running
^ Transaxle Protection Mode is OFF
^ Shift solenoid 1 commanded ON
^ Condition exists for a least 500 ms

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

DTC P0973 is a type A DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use a Scan tool to monitor SHIFT SOLENOID 1 CKT STATUS with solenoid 1 commanded ON. Wiggling wires while watching for a change on SHIFT SOLENOID 1 CKT STATUS may locate the area where a short to ground in the wiring could lie.

Shift solenoid 1 resistance: 9.2-24.1 ohms