Chart C-8, Transmission/Transaxle Torque Converter Clutch: Notes

Fused battery ignition is supplied to the TCC solenoid through the brake switch and transmission/transaxle third gear apply switch. The ECM will engage TCC by grounding circuit No. 422 to energize the solenoid. TCC will engage when engine is warmed up, vehicle speed is above a calibrated value, throttle position sensor output is not changing (indicating a steady road speed), transaxle third gear apply switch is closed and brake switch is closed.

1. Light off confirms transmission/transaxle third gear supply switch is open.
2. At 30 MPH the transmission/transaxle third gear switch should close. Test light will come on and confirm battery supply and closed brake switch.
3. Grounding the diagnostic terminal with engine off should energize the TCC solenoid. This test checks the capability of the ECM to control the solenoid.
4. Solenoids and relays are turned on and off by the ECM internal electronic switches called "drivers". Each driver is part of a group of 4 called Quad-Drivers. Failure of one can damage any other driver with in the set.