Low Idle Speed
- Check water temperature sensor circuit. See CODE 22 in TESTS W/CODES article.
- Check idle speed control valve. See SYSTEM/COMP TESTS article.
- Check EGR system. See SYSTEM/COMP TESTS article.
- Check airflow meter circuit. See CODE 31 and CODE 32 in TESTS W/CODES article.
- Check fuel injectors. See SYSTEM/COMP TESTS article.
- Check ECU. See SYSTEM/COMP TESTS article.