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.

DIAGNOSTIC TEST REFERENCE - CHECKING PARK/NEUTRAL SWITCH OPERATION

TEST	ACTION	APPLICABILITY
1	Ignition on, engine not running. With the DRBIII®, monitor the P/N Position Switch Input status. Move the gear selector through all gear positions, Park to 1st and back to Park. Did the DRB display P/N and D/R in the correct gear positions. Yes --> Go To 2 No --> Go To 3	All
2	The condition is not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wires while checking for shorted and open circuits. Were there any problems found? Yes --> Repair as necessary. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . No --> Test Complete.	All
3	Turn the ignition off to the lock position. Disconnect the PCM harness connector. Disconnect the PNP Switch harness connector. Check connectors - Clean/repair as necessary Measure the resistance of the PNP Switch Sense circuit between the PCM harness connector and the PNP Switch harness connector. Is the resistance below 5.0 ohms? Yes --> Go To 4 No --> Repair the Park/Neutral Position Switch Sense circuit for an open. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .	All
4	Ignition on, engine not running. Disconnect the PCM harness connector. Disconnect the PNP Switch harness connector. Check connectors - Clean/repair as necessary Measure the resistance between the PNP Switch Sense Circuit and ground. Is the resistance below 5.0 ohms? Yes --> Repair the Park/Neutral Position Switch Sense circuit for a short to ground. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST . No --> Go To 5	All
5	If there are no possible causes remaining, view repair. Repair Replace and program the Powertrain Control Module per the Service Information. Perform TRANSMISSION NO TROUBLE CODE VERIFICATION TEST .	All