P2769

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

DESCRIPTION

Shift solenoid valve SL is turned on and off by signals from the ECM 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 ECM detects a malfunction, it turns 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 ECM sends a signal to shift solenoid valve SL to regulate the hydraulic pressure and provide smoother torque converter clutch engagement. Shift solenoid valve SL responds to commands from the ECM. The valve controls the lock-up relay valve to perform the torque-converter lock-up function. If the ECM 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

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

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (SHIFT SOLENOID VALVE SL CIRCUIT)

(a) Disconnect the ECM connector.





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

Standard Resistance:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)

OK -- REPLACE ECM Components

2. CHECK HARNESS AND CONNECTOR (ECM - WIRING HARNESS CONNECTOR)

(a) Disconnect the harness connector from the wiring harness connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL)

(a) Remove the wiring harness connector from the transaxle.





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

Standard Resistance:





Text in Illustration





NG -- INSPECT SHIFT SOLENOID VALVE SL

OK -- REPLACE WIRING HARNESS CONNECTOR Components

4. 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:





Text in Illustration





NG -- REPLACE SHIFT SOLENOID VALVE SL Components

OK -- REPLACE TRANSMISSION WIRE Components