P0977

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: 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 6th is performed in combination with the 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. Also, the ECM stops sending 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 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 its 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 its resistance is 100 kOhms or higher, 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

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 D:





PROCEDURE

1. INSPECT NO. 1 TRANSMISSION WIRE (SHIFT SOLENOID VALVE S2)

(a) Disconnect the C39 No. 1 transmission wire connector.





(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 (NO. 1 TRANSMISSION WIRE - ECM)





(a) Disconnect the C53 ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

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) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.

OK:





NG -- REPLACE SHIFT SOLENOID VALVE S2 Disassembly

OK -- REPAIR OR REPLACE NO. 1 TRANSMISSION WIRE Removal