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P0508-IDLE AIR CONTROL VALVE SENSE CIRCUIT LOW (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (K61) IAC CONTROL CIRCUIT SHORTED TO GROUND (K961) IAC SIGNAL CIRCUIT OPEN (K961) IAC SIGNAL CIRCUIT SHORTED TO GROUND (K61) IAC CONTROL CIRCUIT OPEN IAC MOTOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. IAC MOTOR OPERATION NOTE: If the engine will not idle, maintain an engine speed between 800 and 1500 RPM. Allow the engine to idle. With a scan tool, read the IAC Current. Is the IAC Current below 146 mA? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. IAC MOTOR Turn the ignition off. Disconnect the IAC Motor harness connector. Remove the IAC Motor. NOTE: Inspect the IAC air passages for restrictions and damage Is the resistance 9.7 +/- 1.0 ohms? Yes >> Go To 3 No >> Replace the IAC Motor. Perform the POWERTRAIN VERIFICATION TEST. (Refer HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 547 |