Engine Idle Speed Selector Sensor/Switch Circuit/Open

Where it lives

For P256A, the circuit described runs through the sensor. The description of P256A reports the sensor as open.

Check these first

• An open in the engine idle speed selector circuit
• A failed engine idle speed selector sensor or switch
• Corrosion at the idle speed selector connector
• A blown idle speed selector circuit fuse

What to do next

1. Read the engine idle speed selector input on a scan tool
2. Check the idle speed selector circuit fuse
3. Test the idle speed selector circuit for an open
4. Inspect the idle speed selector connector for corrosion
5. Replace the engine idle speed selector sensor if the circuit tests good
6. Clear the code and retest

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