| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. |
Circuit Description
Throttle control motor opens and closes throttle valve as commanded by ECM. ECM determines throttle valve position using throttle position sensor. If DTC P1128 is set, ECM shuts down power to throttle control motor and electromagnetic clutch.
DTC P1128 is set when throttle control motor locks. Possible causes are
- Faulty throttle control motor.
- Faulty throttle body assembly.
Diagnostic Aids
Using scan tool, read freeze frame data. Freeze frame records engine conditions when malfunction is detected.