P0740

Description
The torque converter clutch solenoid valve is activated, with the gear in "D(4)", 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 REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.




TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.




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
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode for "ENGINE" with CONSULT and wait at least 1 second.

OR

With Generic Scan Tool
1. Turn ignition switch "ON".
2. Select "MODE 7" with GST.

OR

Without Scan Tools
1. Turn ignition switch "ON".
2. Perform self-diagnosis for ECM.
Refer to ["Malfunction Indicator Lamp (MIL)", "ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION"].




DIAGNOSTIC PROCEDURE







COMPONENT INSPECTION

Torque converter clutch solenoid valve
Resistance check




- Check resistance between terminal (5) and ground.

Operation check
- Check solenoid valve by listening for its operating sound while applying battery voltage to the terminal (5) and ground.