Code P0740, TCC Circuit: Notes

Control module monitors difference between engine speed and transaxle input shaft speed. With selector in D3 or D4 (indicated gear 3 or 4) and TCC locked, scan should display engine speed closely matching input speed. PWM solenoid is used to vary hydraulic pressure to converter clutch regulator valve which causes a smooth TCC engagement.

Code 740 will set when vehicle is in 3rd or 4th gear and, brake not applied, TCC is commanded by control module and engine speed-to-vehicle speed ratio does not indicate TCC has engaged. All these conditions must have been met for more than 10 seconds.

1. Checks if fault is caused by a bad solenoid or control circuit.
2. Tests fuse, brake switch, battery power circuits to transaxle connector.
3. Checks control module's ability to pulse PWM solenoid.