Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, clear DTCs, PCM battery disconnect to reset the PCM.

Start the engine.

If the MIL has not yet illuminated, test drive the vehicle to try to get the code to reset.

Does the code reset while cranking or during the test drive?

Yes
1. Go To step 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) WIRE HARNESS INSPECTION

Fig 1: Checking CKP Sensor Wire Harness
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Visually inspect the CKP wire harness. Look for any chafed, pierced, pinched, or partially broken wires.

Visually inspect the CKP wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Make sure the Crankshaft Position Sensor is properly installed and the mounting bolt(s) are torqued to the proper specification.

Were any of the above conditions present?

Yes
1. Repair as necessary
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 3).
3) TONE WHEEL/FLEX PLATE INSPECTION
Remove the Crankshaft Position Sensor.

Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.

Were any problems found?

Yes
1. Repair or replace the Tone Wheel/Flex Plate as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 4).
4) CRANKSHAFT POSITION SENSOR
If there are no possible causes remaining, view repair.

Repair
1. Replace the Crankshaft Position Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .