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 sensor and throttle position sensor [Accelerator Pedal Position (APP) 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
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
AT-TCV-01:
AT-TCV-01
TCM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND
Diagnostic Procedure
1. CHECK VALVE RESISTANCE
1. Turn ignition switch to OFF position.
2. Disconnect terminal cord assembly connector in engine compartment.
3. Check resistance between terminal 5 and around
OK or NG
OK >> GO TO 2.
NG >>
1. Remove oil pan.
2. Check the following items:
- Torque converter clutch solenoid valve
Refer to TORQUE CONVERTER CLUTCH SOLENOID VALVE.
- Harness of terminal cord assembly for short or open
2. CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect TCM harness connector F56.
3. Check continuity between terminal cord assembly F50 terminal 5 (Y/G) and TCM harness connector terminal 3 (Y/G).
Continuity should exist.
If OK, check harness for short to ground and short to power.
4. Reinstall any part removed.
OK or NG
OK >> GO TO 3.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
3. CHECK DTC
Perform AT-159, DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE.
OK or NG
OK >> INSPECTION END
NG >>
1. Perform TCM input/output signal inspection. Pinout Values and Diagnostic Parameters
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
Component Inspection
TORQUE CONVERTER CLUTCH SOLENOID VALVE
-
Resistance Check
- Check resistance between two terminals.
Operation Check
- Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal and ground.