Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0509-IAC VALVE SIGNAL CIRCUIT HIGH DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
If the engine will not idle, maintain an engine speed between 800 and 1500 RPM. Start the engine.Allow the engine to idle.Check for vacuum leaks, proper PCV valve installation, proper MAP Sensor installation, and proper IAC installation.With the DRBIII®, read the IAC Current.Is the IAC Current above 999 mA?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION SYMPTOM (Diagnostic Procedure).Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 2 | Turn the ignition off. Disconnect the IAC Motor harness connector. With the DRBIII®, monitor the IAC Current. Ignition on, engine not running. Does the DRBIII® display IAC Current at 0mA? Yes --> Replace the IAC Motor. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 3 |
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| 3 | With the DRBIII®, actuate the ASD Relay. Measure the voltage on the (K961) IAC Signal circuit in the IAC Motor harness connector. Is the voltage above 0.5 of a volt? Yes --> Repair the short to voltage in the (K961) IAC Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 4 |
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| 4 | Measure the voltage on the (K61) IAC Control circuit in the IAC Motor harness connector. Is the voltage above 0.5 of a volt? Yes --> Repair the short to voltage in the (K61) IAC Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5
NOTE:
Stop the ASD Relay actuation before continuing.
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| 5 | Turn the ignition off. Disconnect the C2 PCM harness connector. Measure the resistance across the (K961) IAC Signal circuit and the (K61) IAC Control circuit in the IAC Motor harness connector. Is the resistance below 5.0 ohms? Yes --> Repair the short between the (K61) IAC Control circuit and the (K961) IAC Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 6 |
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| 6 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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