P0740
DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVEDescription
The torque converter clutch solenoid valve is activated, with the gear in "D4", by the TCM in response to signals sent from the vehicle speed and throttle position sensors. Lock-up piston operation will then be controlled.
Lock-up operation, however, is prohibited when A/T fluid temperature is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
TCM TERMINALS AND REFERENCE VALUE
ON BOARD DIAGNOSIS LOGIC
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE
NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
With CONSULT-II
1) Turn ignition switch ON.
2) Select "DATA MONITOR" mode for "ENGINE" with CONSULT-II and wait at least 1 second.
With GST
Follow the procedure "With CONSULT-II".
Wiring Diagram-AT-TCV
Diagnostic Procedure
1. Check Ground Circuit
2. Check Resistance
3. Check DTC
Resistance Check
- Check resistance between terminal 7 and ground.
Operation Check
- Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal 7 and ground.