High Idle Speed
- Check accelerator pedal linkage.
- Check dashpot. See SYSTEM/COMP TESTS article.
- Check power steering system for proper operation.
- Check water temperature sensor circuit. See CODE 22 in TESTS W/CODES article.
- Check intake air temperature sensor circuit. See CODE 24 in TESTS W/CODES article.
- Check idle speed control valve circuit. See IDLE SPEED CONTROL (ISC) VALVE CIRCUIT chart in TESTS W/CODES article.
- Check A/C signal circuit. See A/C SIGNAL CIRCUIT chart in TESTS W/CODES article.
- Check ECU power source. See ECU POWER SOURCE CIRCUIT chart in TESTS W/CODES article.
- Check neutral start switch circuit. See CODE 51 in TESTS W/CODES article.
- Check throttle position sensor circuit. See CODE 41 and CODE 47 in TESTS W/CODES article.
- Check ECU. See SYSTEM/COMP TESTS article.