Functional Check Procedure

PRELIMINARY CHECKING PROCEDURE
The purpose of the preliminary checking procedure is to isolate external electrical problems from internal ones.

Important: You may use a DLC scanner in order to verify the electrical circuit. Remember, a complete circuit does not indicate that the solenoid will apply.

Important: Do not bench test using an automotive type battery. Accidentally crossed wires will damage the internal diodes of the TCC solenoid.

FUNCTIONAL CHECK PROCEDURE
1. Install a tachometer or a scan tool.
2. Operate the vehicle until you have reached the proper operating temperature.
3. Drive the vehicle at 80-88 km/h (50-55 mph) with a light throttle (road load).
4. Maintaining throttle speed, lightly touch the brake pedal. Check for the release of the TCC and a slight increase in engine speed.
5. Release the brake and slowly accelerate. Check for a reapply of the converter clutch and a slight decrease in engine speed.

EXTERNAL CONTROLS
1. Connect a voltmeter between the transmission electrical connector and the ground.
2. Turn the key ON.
3. If zero or low voltage is found, refer to Powertrain Management for electrical diagnosis.
4. If 12 volts are present at the connector, diagnose TCC hydraulic system.