Component Diagnostic Charts (C-Charts) - Throttle Body Fuel Injection

Fig. 115 - Wiring Diagram for Chart C-8 Transmission/Transaxle Converter Clutch. VIN P:

CHART C-8A

TRANSMISSION/TRANSAXLE CONVERTER CLUTCH (TCC)

2.0L "J" SERIES

FUEL INJECTION (TBI)

The purpose of the transmission/transaxle converter clutch feature is to eliminate the power loss of the transmission/transaxle converter stage when the vehicle is in a cruise condition. This allows the convenience of the automatic transmission/transaxle and the fuel economy of a manual transmission/transaxle.
Fused battery ignition is supplied to the TCC solenoid through the brake switch, and transmission/transaxle third gear switch. The ECM will engage TCC by grounding CKT 422 to energize the solenoid.
TCC will engage when:
a. Engine warmed up.
b. Vehicle speed above a calibrated value.
c. Throttle position sensor output not changing, indicating a steady road speed.
d. Transmission/transaxle third gear switch closed
e. Brake switch closed

Fig. 113 Chart C-8 Transmission/Transaxle Converter Clutch.:

1. Light off confirms transmission/transaxle third gear apply 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 ignition "ON", engine "OFF", should energize the TCC solenoid by grounding CKT 422. This test checks the capability of the ECM to supply a ground for the TCC solenoid.
4. Solenoid and relay's are turned "ON" or "OFF" by the ECM internal electronic switches called "drivers". Each driver is part of a group of four called "Quad-Drivers."
Failure of one can damage any other driver within the set.
Before replacing ECM be sure to check the coil resistance of all solenoids and relays controlled by the ECM. See ECM wiring diagram for the solenoid(s) and relay(s) and the coil terminal identification.
When checking TCC solenoid be sure to raise drive wheels and run about 30 MPH to close third gear apply switch.