Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Remove any debris from the ECM connector surfaces before servicing the ECM. Inspect the ECM connector gaskets when diagnosing or replacing the ECM. Ensure that the gaskets are installed correctly. The gaskets are installed correctly. The gaskets prevent containment intrusion into the ECM.
- For any test that requires probing the ECM or the component harness connectors, use the J 35616-A Connector Test Adapter Kit. Using this kit prevents any damage to the harness connector terminals.
- The following conditions may cause this DTC to set:
- Any poor connections or poor terminal tension at the sensor.
- Crankshaft reluctor wheel damage or improper installation.
- Foreign material passing between the CKP sensor and the reluctor wheel.
- Insufficient fuel.
- Excessive air gap between the CKP sensor and the reluctor wheel.
- Excess crankshaft end play causes the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. This could result in a no start, start and stall or erratic performance.
- For an intermittent, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.