DTC: P0740

Search Bulletins/Recalls for P0740

Trouble diagnosis name: Automatic Transmission (A/T) Torque Converter Clutch (TCC) Solenoid Valve (S/V)

Shape may vary for some models

Component Description

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 the ECM (throttle opening). 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.

DTC detecting condition:

• Diagnostic trouble code TCC SOLENOID/CIRC with CONSULT-II or P0740 without CONSULT-II is detected when TCM detects an improper voltage drop when it tries to operate the solenoid valve.

Possible cause:

• Torque converter clutch solenoid valve
• Harness or connectors (The solenoid circuit is open or shorted.)