DTC Confirmation Test

Malfunction is detected when an excessively low or high voltage from Throttle Actuator Control (TAC) module is sent to ECM. Possible causes are:

• TCS signal circuit open or shorted.
• Defective TAC module.

To set DTC, turn ignition on. Turn TCS switch to ON position. Start engine and let it idle for at least 3 seconds. Turn ignition off and wait at least 5 seconds. Turn ignition on and retrieve DTCs using MIL. See RETRIEVING DIAGNOSTIC TROUBLE CODES USING MIL  under SELF-DIAGNOSTIC SYSTEM.