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Idle Control System Idle Control System The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0506: Idle control system RPM lower than NOTE: If DTC P0511 is stored at the same time as DTC P0506, troubleshoot DTC P0511 first, then troubleshoot DTC P0506. Possible Cause IAC valve mechanical malfunction Throttle body clogged port, improper adjustment Intake manifold gasket leakage Vacuum hoses leakage ECT sensor incorrect output Troubleshooting Flowchart — The MIL has been reported on. Problem verification: 1. Start the engine. Hold the engine at 3,000 rpm with no 2. Check the engine speed at idle with no-load conditions: conditioner are not operating. Is it 650 ± 50 rpm? Intermittent failure, system is OK NO (To page 11-77 ) Main Menu Table of Contents |