Idle Air Control (IAC) Valve

See appropriate articles; BASIC TESTING , TESTS W/CODES - MOTRONIC 4.1L & 5.2L SYSTEM or TESTS W/CODES - TRIONIC SYSTEM articles. Since many computer controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in appropriate articles; TESTS W/CODES - MOTRONIC 4.1L & 5.2L SYSTEM or TESTS W/CODES - TRIONIC SYSTEM .