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Idle Control System Idle Air Control (IAC) Valve The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0511: A problem in the Idle Air Control (IAC) valve circuit. — The MIL has been reported on. Problem verification: 1. Do the PCM Reset Procedure. 2. Start the engine. Is DTC P0511 indicated? YES Check for an open in the wire (IGP1 line): nector. 3. Turn the ignition switch ON (II). ground and the IAC valve con- Is there battery voltage? Is there battery voltage? YES Check the IAC valve function: Does the IAC valve click? YES Substitute a known-good PCM tion goes away, replace the origi- nal PCM. NO Intermittent failure, system is OK Repair open in the wire between Wire side of female terminals Repair open or short in the wire Replace the IAC valve. Main Menu Table of Contents |