| 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. |
Circuit Description
ETCS is composed of throttle control motor, electromagnetic clutch, Throttle Position (TP) sensor, accelerator position sensor, ECM and throttle body. If DTC P1129 is set, ECM shuts down power to throttle control motor and electromagnetic clutch. DTC P1129 is set when throttle opening angle continuously varies from normal range. Possible causes are
- Electric throttle control system.
- ECM.