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Idle Control System NOTE: If DTC P1508 is stored at the same time as DTC P0505, troubleshoot DTC P1508 first, then troubleshoot DTC P0505. Possible Cause • IAC valve mechanical malfunction • Idle air control thermal valve malfunction • Throttle body clogged port, improper adjustment • Intake manifold gasket leakage • Intake air hose loose or leaking • Vacuum hoses leakage • ECT sensor incorrect output • Throttle Position sensor incorrect output* •: '96 model only — The MIL has been reported on. Problem verification: engine at 3,000 rpm with no the radiator fan comes on, 2. With the scan tool, check the following items ('96 model about 10% with the throttle fully closed. — Engine coolant tempera- ture should be about 176 - 194°F (80-90°C). If they are not within the spec., 3 Check the engine speed at idle with no-load conditions: Is it 650 50 rpm? NO Is it 600 rpm or less? YES Intermittent failure, system is OK at this time. NO ) (To page YES The scan tool indicates Diagnostic Trouble Code (DTC) P0505: Idle control system malfunction. Troubleshooting Flowchart Main Menu Table of Contents |