P0976

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0976, P0977: Shift Solenoid "B" Control Circuit Low (Shift Solenoid Valve S2)
P0977 - Shift Solenoid "B" Control Circuit High (Shift Solenoid Valve S2)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operations of the shift solenoid valves S1, S2, SR, SL1 and SL2, 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 valve to allow the vehicle to be driven smoothly 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 circuits, the ECM detects the problem, illuminates the MIL and stores the DTC. When the shift solenoid valve S2 is ON, if the resistance is 8 Ohms or less, the ECM determines that there is a short malfunction in the shift solenoid valve S2 circuit.

When the shift solenoid valve S2 is OFF, if the resistance is 100 kOhms or more, the ECM determines that the shift solenoid valve S2 circuit is open Fail-Safe Chart.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

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

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
The shift solenoid valve S2 is turned 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:





Text in Illustration





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:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

3. INSPECT SHIFT SOLENOID VALVE S2 P0756

NG -- REPLACE SHIFT SOLENOID VALVE S2 Disassembly

OK -- REPAIR OR REPLACE TRANSMISSION WIRE Removal