P0974

A761E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0973: Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)

DTC P0973 - Shift Solenoid "A" Control Circuit Low (Shift Solenoid Valve S1)

DTC P0974 - Shift Solenoid "A" Control Circuit High (Shift Solenoid Valve S1)

DESCRIPTION

Shifting from 1st to 6th is performed in combination with ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely. In case of an open or short circuit, the ECM stops sending the current to the open or short circuited solenoid Fail-Safe Chart.






MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S1 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve S1 is ON, if resistance is 8 Ohms or less, the ECM determines there is a short in the shift solenoid valve S1 circuit.
When the shift solenoid valve S1 is OFF, if resistance is 100 kOhms or more, the ECM determines there is an open in the shift solenoid valve S1 circuit Fail-Safe Chart.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0973: Range check (Low resistance)





P0974: Range check (High resistance)





TYPICAL MALFUNCTION THRESHOLDS

P0973: Range check (Low resistance)





P0974: Range check (High resistance)





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: The shift solenoid valve S1 is turned ON/OFF normally when the shift lever is on D:





PROCEDURE

1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE S1)




(a) Disconnect the E1 wire connector.
(b) Measure the resistance of the transmission wire.
Standard resistance:






NG -- INSPECT SHIFT SOLENOID VALVE S1
OK -- Continue to next step.
2. CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)




(a) Disconnect the E3 ECM connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE ECM
3. INSPECT SHIFT SOLENOID VALVE S1




(a) Remove the shift solenoid valve S1.
(b) Measure the resistance of the solenoid valve.
Standard resistance:





(c) Connect the battery's positive (+) lead to the terminal of the solenoid valve connector, and the negative (-) lead to the solenoid body. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes operating noise.
NG -- REPLACE SHIFT SOLENOID VALVE S1
OK -- REPAIR OR REPLACE TRANSMISSION WIRE