P0979

A760H AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0979: Shift Solenoid "C" Control Circuit Low (Shift Solenoid Valve S3)

DTC P0979 - Shift Solenoid "C" Control Circuit Low (Shift Solenoid Valve S3)

DTC P0980 - Shift Solenoid "C" Control Circuit High (Shift Solenoid Valve S3)

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 is controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly. (In case of an open or short circuit, the ECM stops sending current to the circuit.) Fail safe function Fail-Safe Chart.






MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S3 circuit. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. When the shift solenoid valve S3 is on, if resistance is 8 Ohms or less, the ECM determines there is a short in the shift solenoid valve S3 circuit.
When the shift solenoid valve S3 is off, if resistance is 100 kOhms or more, the ECM determines there is an open in the shift solenoid valve S3 circuit Fail-Safe Chart.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0979:

Range check (Low resistance)






P0980:

Range check (High resistance)






TYPICAL MALFUNCTION THRESHOLDS

P0979:

Range check (Low resistance)






P0980:

Range check (High resistance)






COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- The shift solenoid valve S3 is turned on/off normally when the shift lever is in the D position:






PROCEDURE

1. INSPECT TRANSMISSION WIRE (S3)




(a) Disconnect the transmission wire connector from the transmission.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- INSPECT SHIFT SOLENOID VALVE S3
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)




(a) Connect the transmission connector to the transmission.
(b) Disconnect the connector from the ECM.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
3. INSPECT SHIFT SOLENOID VALVE S3




(a) Remove the shift solenoid valve S3.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
OK:
The solenoid makes an operating sound.
NG -- REPLACE SHIFT SOLENOID VALVE S3
OK -- REPAIR OR REPLACE TRANSMISSION WIRE