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

Fig. 111 - Wiring Diagram for Chart C-8 Transmission/Transaxle Converter Clutch. VIN P:

CHART C-8,

TRANSMISSION CONVERTER CLUTCH (TCC)

2.0L "J" SERIES

Fig. 110 Chart C-8 Transmission/Transaxle Converter Clutch:

The purpose of the automatic transmission torque converter clutch feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise condition. This allows the convenience of the automatic transmission and the fuel economy of a manual transmission.
Fused battery ignition is supplied to the TCC solenoid through the brake and third gear apply switch.
The ECM will engage TCC by gounding CKT 422 to energize the solenoid.
TCC will engage when:
- Vehicle speed above 45 MPH (72 km/h).
- Engine at normal operating temperature (above 70°C, 158°F).
- Throttle position sensor output not changing, indicating a steady road speed.
- Transmission 3rd gear switch closed.
- Brake switch closed.
1. Light "OFF" confirms transmission 3rd gear switch is open.
2. At 30 MPH (48 km/h), the 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 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. Solenoid coil resistance must measure more than 20 ohms. Less resistance will cause early failure of the ECM "DRIVER". Using on ohmmeter, check the solenoid coil resistance of the following before installing a replacement ECM.
- Pulsair solenoid.

TCC solenoid, check resistance of TCC solenoid as follows:
1. Disconnect TCC at transmission.
2. Connect ohmmeter between transmission connector opposite harness connector Terminal "A" and "D".
3. Raise drive wheels.
4. Run engine in drive about 30 MPH (48 km/h) to close third gear apply switch.
5. Replace the TCC solenoid and ECM if resistance measures less than 20 ohms when switch is closed.