P0976

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM (for 1GR-FE): P0976: Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2)

DTC P0976 - Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2)

DTC P0977 - Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2 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 smoothly. (In case of an open or short circuit, the ECM stops sending current to the circuit. For details, refer to the fail-safe chart Fail-Safe Chart.)





MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve S2 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 S2 is on, if resistance is 8 Ohms or less, the ECM determines there is a short in the shift solenoid valve S2 circuit.
When the shift solenoid valve S2 is off, if resistance is 100 kOhms or more, the ECM determines there is an open in the shift solenoid valve S2 circuit Fail-Safe Chart.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0976: Range check (Low resistance)





P0977: Range check (High resistance)





TYPICAL MALFUNCTION THRESHOLDS

P0976: Range check (Low resistance)





P0977: Range check (High resistance)





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: The shift solenoid valve S2 turns ON/OFF normally when the shift lever is in the D position:





PROCEDURE

1. INSPECT TRANSMISSION WIRE (S2)




(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 S2
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)




(a) Connect the transmission wire connector to the transmission.
(b) Disconnect the ECM connector.
(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 S2




(a) Remove the shift solenoid valve S2.
(b) Measure the resistance according to the value(s) in the table below.
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 an operating noise.

NG -- REPLACE SHIFT SOLENOID VALVE S2
OK -- REPAIR OR REPLACE TRANSMISSION WIRE