Test Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Test numbers refer to numbers on diagnostic chart.

Determines whether fault is caused by a bad solenoid or control circuit.
Checks availability of battery voltage.
Checks PCM's ability to pulse PWM solenoid on and off.

Fig 1: Code P0740 Schematic (3.8L) Torque Converter Clutch

Fig 2: Code P0740 Diagnostic Flow Chart (3.8L) Torque Converter Clutch