P2770

U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P2769: Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)

DTC P2769 - Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)

DTC P2770 - Open in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)

DESCRIPTION

The shift solenoid valve SL is turned ON or OFF by signals from the TCM to control the hydraulic pressure acting on the lock-up relay valve, which then controls operation of the lock-up clutch.






Fail-safe function:
If the TCM detects a malfunction, it turns the shift solenoid valve SL OFF.

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, the air flow meter and the crankshaft position sensor, the TCM sends a signal to the solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. The shift solenoid valve SL responds to commands from the TCM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the TCM detects an open or short circuit for shift solenoid valve SL, it will illuminate the MIL.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P2769: Range check (Low resistance):





P2770: Range check (High resistance):





TYPICAL MALFUNCTION THRESHOLDS

P2769: Range check (Low resistance):





P2770: Range check (High resistance):





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)




(a) Remove the TCM from the transaxle.
(b) Measure the resistance of the transmission wire.
Standard resistance:






OK -- REPLACE TCM
NG -- Continue to next step.
2. INSPECT SHIFT SOLENOID VALVE SL (RESISTANCE)
(a) Remove the shift solenoid valve SL.




(b) Measure the resistance between the solenoid valve terminal and solenoid valve body.
Standard resistance:






NG -- REPLACE SHIFT SOLENOID VALVE SL
OK -- REPLACE TRANSMISSION WIRE