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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 ((Cabin Compartment Node (CCN) - Electrical Diagnostics)) >> DTC Troubleshooting >> P0839-Four Wheel Drive (4WD) Switch Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read Cluster DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2.

      No 

      • The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. TRANSFER CASE SELECTOR SWITCH 
    Fig 1: Measuring Voltage Of Transfer Case Selector Switch
    GC0091202Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Transfer Case Selector Switch harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K77) Transfer Case Position Sensor Input circuit.

      Is the voltage above 5.5 volts?

      Yes 

      • Go To  3.

      No 

      • Replace the Transfer Case Selector Switch in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. (K77) TRANSFER CASE POSITION SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 2: Checking Transfer Case Position Sensor Input Circuit For A Short To Voltage
    GC0091203Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Cluster C3 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (K77) Transfer Case Position Sensor Input circuit at the Transfer Case Selector Switch harness connector.

      Is the voltage above 0.2 of a volt?

      Yes 

      • Repair the (K77) Transfer Case Position Sensor Input circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Cluster in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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