A750E

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0985,P0986: Shift Solenoid "E" Control Circuit Low (Shift Solenoid Valve SR)
P0986 - Shift Solenoid "E" Control Circuit High (Shift Solenoid Valve SR)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, S1, S2 and SR, which is controlled by the ECM. If an open or short circuit occurs in one 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 .)





MONITOR DESCRIPTION

These DTCs indicate an open or short in the shift solenoid valve SR 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 SR is on, if its resistance is 8 Ohms or less, the ECM determines there is a short in the shift solenoid valve SR circuit.

When the shift solenoid valve SR is off, if its resistance is 100 kOhms or more, the ECM determines there is an open in the shift solenoid valve SR circuit .

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





P0985: Range check (Low resistance)





P0986: Range check (High resistance)





TYPICAL MALFUNCTION THRESHOLDS

P0985: Range check (Low resistance)





P0986: Range check (High resistance)





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs .

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





PROCEDURE

1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SR)

(a) Disconnect the D63 transmission wire connector.





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

Standard resistance:





NG -- INSPECT SHIFT SOLENOID VALVE SR
OK -- Continue to next step.

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

(a) Disconnect the D74 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 SR

(a) Remove shift solenoid valve SR.





(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 SR

OK -- REPAIR OR REPLACE TRANSMISSION WIRE