P2770

U760E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P2769, P2770: Short in Torque Converter Clutch Solenoid Circuit (Shift Solenoid Valve SL)


DESCRIPTION

Shift solenoid valve SL is turned on and 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 shift solenoid valve SL off.

MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, air flow meter and crankshaft position sensor, the TCM sends a signal to shift solenoid valve SL to regulate the hydraulic pressure and provide smooth torque converter engagement. 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 and store the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





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

Refer to DTC P0741 P0741.

INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL) P0741

NG -- INSPECT SHIFT SOLENOID VALVE SL

OK -- REPLACE TCM Removal

2. INSPECT SHIFT SOLENOID VALVE SL

(a) Remove shift solenoid valve SL.





(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:





Text in Illustration





NG -- REPLACE SHIFT SOLENOID VALVE SL Disassembly

OK -- REPLACE TRANSMISSION WIRE Removal