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Home >> Jeep >> 2009 >> Commander Overland, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Powertrain Control Module (Pcm) - Electrical Diagnostics - 545RFE Automatic Transmission) >> DTC Troubleshooting >> P0957-AUTOSTICK Circuit Low >> Diagnostic Test

Diagnostic Test

  1. CHECK IF THE DTC IS CURRENT 
    1. Start the engine in park.
    2. With the scan tool, read the AutoStick® voltage.

      Does the scan tool AutoStick voltage read below 0.35 of a volt?

      Yes 

      • Go to step  2

      No 

      • Go to step  5
  2. CHECK THE SHIFT LEVER ASSEMBLY 
    1. Turn the ignition off to the lock position.
    2. Disconnect the Shift Lever Assembly harness connector.
    3. Start the engine in park.
    4. With the scan tool, read the AutoStick voltage.

      Does the scan tool AutoStick voltage read below 0.35 of a volt?

      Yes 

      • Go to step  3

      No 

  3. CHECK THE (T5) AUTOSHIFT UP/DOWN SENSE CIRCUIT FOR A SHORT TO GROUND 
    Fig 1: Checking Autoshift Up/Down Sense Circuit For A Short To Ground
    GC0120476Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the PCM C3 harness connector and connect the PCM Pinout Box 8815.
      CAUTION: 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 the PCM Pinout Box 8815 to perform diagnosis.
    3. Measure the resistance between ground and the (T5) AutoStick Up/Down Sense circuit.

      Is the resistance below 5.0 Ohms

      Yes 

      No 

      • Go to step  4
  4. CHECK THE (T5) AUTOSHIFT UP/DOWN SENSE CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 2: Checking Autoshift Up/Down Sense Circuit For A Short To Another Circuit
    GC0120477Courtesy of CHRYSLER LLC
    1. Measure the resistance between the (T5) AutoStick Up/Down Sense circuit and all other circuits in the Shift Lever Assembly harness connector.

      Is the resistance below 5.0 Ohms between the (T5) AutoStick Up/Down Sense circuit and any other circuit(s) in the Shift Lever Assembly harness connector.

      Yes 

      No 

      • Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform Quick Learn.
      • Perform the 545RFE TRANSMISSION VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  5. CHECK THE AUTOSTICK VOLTAGE WHILE SHIFTING 
    1. Start the engine in park.
    2. With the brakes firmly applied, shift into AutoStick.
    3. With the scan tool, monitor the AutoStick voltage while shifting both Up and Down.

      Did the scan tool AutoStick voltage drop below 0.35 of a volt at any given time?

      Yes 

      No 

      • Go to step  6
  6. CHECK WIRING AND CONNECTORS 
    1. The conditions necessary to set this DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    3. Wiggle the wiring and connectors while checking for any possible open or shorted circuits.
    4. Check for any Service Information Tune-ups or Technical Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Test Complete.