Diagnostic Aids

Check for any of the following conditions:

• Check the crankshaft position (CKP) sensor output signal with a scan tool. The scan tool will display engine speed while cranking when the PCM detects the CKP sensor signal. Observe the Engine Speed parameter while cranking the engine. The scan tool should indicate a steady 200-300 RPM while cranking.
• The CKP sensor performance may be affected by temperature. Check the sensors operation and internal resistance at various temperatures. The CKP sensor resistance when cold should be between 1,630 ohms and 2,740 ohms at -10 to +50°C (14-122°F). The CKP sensor resistance when hot should be between 2,065 ohms and 3,225 ohms at 50-100°C (122-212°F).
• An intermittent DTC P0339 can be caused by a defective signal rotor. Remove the CKP sensor and visually inspect the teeth of the signal rotor through the CKP sensor aperture for damage, foreign material, or incorrect installation.
• A DTC P0339 that sets while driving and checks OK may be caused by inadequate CKP sensor circuit shielding. Check that the CKP sensor circuit is properly shielded and that the drain wire is fastened securely to ground.

An intermittent malfunction may be caused by a fault in the CKP sensor electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .

Repair any electrical circuit faults that were found. Refer to Wiring Repairs in Wiring Systems.

The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.