P2770

U341E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P2769,P2770: 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" and "OFF" by signals from the ECM in order to control the hydraulic pressure operation and lock-up relay valve, which then controls the operation of the lock-up clutch.
Fail safe function:
If the ECM detects a malfunction, it turns the shift solenoid valve SL off.






MONITOR DESCRIPTION

Based on the signals from the throttle position sensor, the mass airflow meter and the crankshaft position sensor, the ECM sends a signal to the shift solenoid valve SL to regulate the hydraulic pressure and provide smoother gearshifts. The 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, the ECM will illuminate the MIL and store the DTC.

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 (SL)




(a) Disconnect the transmission wire connector from the transaxle.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- INSPECT SHIFT SOLENOID VALVE SL
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)




(a) Connect the transmission wire connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
3. INSPECT SHIFT SOLENOID VALVE SL




(a) Remove the shift solenoid valve SL.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.
OK:
The solenoid valve makes an operating sound.
NG -- REPLACE SHIFT SOLENOID VALVE SL
OK -- REPAIR OR REPLACE TRANSMISSION WIRE