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Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
TRANSMISSION RANGE SENSOR IMPROPERLY CALIBRATED
TRS HARNESS CONNECTOR
(F1) FUSED IGNITION SWITCH OUTPUT (OFF-RUN-START) OPEN
(T826) TRS REVERSE SIGNAL CIRCUIT OPEN
(T825) TRS NEUTRAL SIGNAL CIRCUIT OPEN
(T826) TRS REVERSE SIGNAL CIRCUIT SHORT TO GROUND
(T825) TRS NEUTRAL SIGNAL CIRCUIT SHORT TO GROUND
TRANSMISSION RANGE SENSOR
TRANSMISSION CONTROL MODULE (TCM)

Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  Standard Procedure  . 



  1. CHECK IF DTC IS CURRENT 
    NOTE:

    This DTC may set if the Transmission Range Sensor has been replaced or reinstalled and not properly adjusted (calibrated). Make sure the TRS is properly adjusted in accordance to the Service Information before attempting to perform this diagnostic procedure. If the TRS was improperly adjusted, adjust as necessary and perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

    1. Using the scan tool, read TCM DTCs.
    2. Record the Environmental Data and any DTCs.
    3. Clear DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. Read TCM DTCs.

      Did the DTC reset?

      Yes 

      • Go To  2.

      No 

      • Go To  12.
  2. CHECK IF DTC CONDITIONS 
    1. Ignition on, engine not running.
    2. With the scan tool, monitor the TRS circuits while moving the shift lever several times to each gear position (P, R, N, D, 3, 2, and 1).

      Pick the answer that best describes your findings:

      No TRS circuits change from "Open" to "Closed" 

      • Go To  3.

      The Reverse (R) TRS position does not change from "Open" to "Closed" 

      • Go To  6.

      The Neutral (N) TRS position does not change from "Open" to "Closed" 

      • Go To  9.

      All TRS circuits seem to be working properly 

      • Go To  12.
  3. CHECK THE TRS CONNECTOR 
    1. Turn the ignition off to the lock position.
    2. Inspect the TRS harness connector.

      Is the TRS harness connector unplugged or not fully seated?

      Yes 

      • Repair or replace the TRS harness connector as necessary.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Go To  4.
  4. CHECK THE (F1) FUSED IGNITION SWITCH OUTPUT (OFF-RUN-START) CIRCUIT FOR AN OPEN 
    Fig 1: Checking Fused Ignition Switch Output (Off-Run-Start) Circuit For An Open
    GC0111519Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the TRS harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    3. Ignition on, engine not running.
    4. Using a test light connected to ground, check the (F1) Fused Ignition Switch Output (Off-Run-Start) circuit.
      NOTE:

      The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

      Does the test light illuminate brightly?

      Yes 

      • Go To  5.

      No 

      • Repair the (F1) Fused Ignition Switch Output (Off-Run-Start) circuit for an open.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .
  5. CHECK THE TRANSMISSION RANGE SENSOR 
    Fig 2: Checking Transmission Range Sensor
    GC0111520Courtesy of CHRYSLER LLC
    1. Ignition on, engine not running.
    2. With the scan tool, monitor the TRS circuits in the following steps.
    3. Using a jumper wire, jump each TRS circuit one at a time to the (F1) Fused Ignition Switch Output (Off-Run-Start) circuit in the TRS harness connector.

      Do the TRS circuits read as "Closed" on each circuit when connected with a jumper wire?

      Yes 

      • Replace the Transmission Range Sensor in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the TCM in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .
  6. CHECK THE (T826) TRS REVERSE SIGNAL CIRCUIT 
    Fig 3: Checking TRS Reverse Signal Circuit
    GC0111521Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the TRS harness connector.
    3. Using a jumper wire, connect the (F1) Fused Ignition Switch Output (Off-Run-Start) circuit to the (T826) TRS Reverse Signal circuit in the TRS harness connector.
    4. Ignition on, engine not running.
    5. With the scan tool, read the TRS Reverse state.

      Does the scan tool read as "Closed"?

      Yes 

      • Replace the Transmission Range Sensor in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Go To  7.
  7. CHECK THE (T826) TRS REVERSE CIRCUIT FOR AN OPEN 
    Fig 4: Checking TRS Reverse Circuit For An Open
    GC0111522Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the TCM C3 harness connector
    3. Measure the resistance of the (T826) TRS Reverse Signal circuit between TRS harness connector and the TCM C3 harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      • Repair the (T826) TRS Reverse Signal circuit for an open.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Go To  8.
  8. CHECK THE (T826) TRS REVERSE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 5: Checking TRS Reverse Signal Circuit For A Short To Ground
    GC0111523Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (T826) TRS Reverse Signal circuit.

      Is the resistance below 100k Ohms?

      Yes 

      • Repair the (T826) TRS Reverse Signal circuit for a short to ground.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the TCM in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .
  9. CHECK THE (T825) TRS NEUTRAL SIGNAL CIRCUIT 
    Fig 6: Checking TRS Neutral Signal Circuit
    GC0111524Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the TRS harness connector.
    3. Using a jumper wire, connect the (F1) Fused Ignition Switch Output (Off-Run-Start) circuit to the (T825) TRS Neutral Signal circuit in the TRS harness connector.
    4. Ignition on, engine not running.
    5. With the scan tool, read the TRS Neutral state.

      Does the scan tool read as "Closed"?

      Yes 

      • Replace the Transmission Range Sensor in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Go To  10.
  10. CHECK THE (T825) TRS NEUTRAL CIRCUIT FOR AN OPEN 
    Fig 7: Checking TRS Neutral Circuit For An Open
    GC0111525Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the TCM C3 harness connector
    3. Measure the resistance of the (T825) TRS Neutral Signal circuit between TRS harness connector and the TCM C3 harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      • Repair the (T825) TRS Neutral Signal circuit for an open.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Go To  11.
  11. CHECK THE (T825) TRS NEUTRAL SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 8: Checking TRS Neutral Signal Circuit For A Short To Ground
    GC0111526Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (T825) TRS Neutral Signal circuit.

      Is the resistance below 100k Ohms?

      Yes 

      • Repair the (T825) TRS Neutral Signal circuit for a short to ground.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .

      No 

      • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace and program the TCM in accordance with the Service Information.
      • Perform AS68RC VERIFICATION TEST. Refer to Standard Procedure .
  12. CHECK WIRING AND CONNECTORS 
    1. With the scan tool, erase Transmission DTCs.
    2. Test Drive the vehicle while perform multiple upshifts, downshifts, stops, shift to park then to drive.
    3. With the scan tool, read Transmission DTCs.

      Did the DTC reset?

      Yes 

      • Go To  3.

      No 

      • Go To  13.
  13. CHECK WIRING AND CONNECTORS 
    1. The conditions necessary to set the 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 wires while checking for shorted and open circuits.
    4. Check for any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

      • Test Complete.
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