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.

P0837-4WD MUX SWITCH PERFORMANCE DIAGNOSTIC TEST REFERENCE

TEST	ACTION	APPLICABILITY
1	With the DRBIII®, read DTCs. Are any other Transfer Case DTCs present? Yes --> Repair all other Transfer Case DTCs before proceeding. No --> Go To 2	All
2	Verify proper Transfer Case Shifter adjustment per the Service Information. Is the Transfer Case Shifter adjusted correctly? Yes --> Go To 3 No --> Adjust the Transfer Case shifter linkage per the Service Information.	All
3	Turn the ignition off to the lock position. Disconnect the PCM harness connector(s). CAUTION: IF EQUIPPED WITH NGC CONTROLLER, DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance across the Transfer Case Position Sensor signal circuit and Sensor Ground circuit at the PCM harness connector. Place the transfer case in each of the following positions: 2H - resistance should be between 1124 and 1243 ohms. 4H - resistance should be between 650 and 719 ohms. N - resistance should be between 389 and 431 ohms. 4L - resistance should be between 199 and 221 ohms. Were all resistance values in each transfer case position within the specified range? Yes --> Go To 4 No --> Replace the Transfer Case Position Sensor.	All
4	If there are no possible causes remaining, view repair. Repair Replace and program the Powertrain/Engine Control Module per the Service Information. Perform the appropriate Powertrain verification test.	All