P0974

DTC P0973 Shift solenoid system A circuit (Low)
DTC P0974 Shift solenoid system A circuit (High)

Circuit description

Signals from the transmission control computer ASSY change the vehicle speed from 1st to 6th gear according to the combination of the transmission 3 way solenoid ASSY (S1, S2, S3, S4, SR) and the clutch control solenoid No.1 (SL1, SL2). When there is an open or short circuit in the solenoid valve system, the transmission control computer ASSY stops continuity to all solenoids as the fail safe function. As a result, only the mechanical hydraulic circuit is available and the manual shift control is initiated.





Monitor description

These diagnostic codes indicate open or short circuit in the shift solenoid valve S1 circuit. If there is open or short circuit in any of the shift solenoid valve circuits, TCM detects the defect, turns on MIL, and records the diagnostic code.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS
P0973: Shift solenoid 1 (short circuit to ground)





P0974: Shift solenoid 1 (open circuit/battery short circuit)





Circuit figure





Inspection steps

NOTE:
ON/OFF status when transmission 3 way solenoid ASSY (S1) is normal (Select lever in D position)