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Home >> Chrysler >> 2011 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1616 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 68RFE Automatic Transmission - 2500 Hd)) >> DTC Troubleshooting >> P0871-Od Pressure Switch Rationality >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTCS 
    1. With the scan tool, read DTCs.

      Are there any TCM Power Control Circuit or TCM Power Input DTCs present?

      Yes 

      No 

      • Go To  2
  2. CHECK IF LINE PRESSURE DTCS ARE PRESENT 
    1. With the scan tool, read DTCs.

      Are there any Line Pressure DTCs present?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR OTHER PRESSURE SWITCH DTCS 
    1. With the scan tool, read DTCs.

      Are there two or more other pressure switch rationality DTCs present in addition to P0871?

      Yes 

      • Go To  5

      No 

      • Go To  4
  4. CHECK IF DTC IS CURRENT 
    1. With the scan tool, check and record the Event Data.
      NOTE:

      Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.

      Does the Event Data show data for P0871?

      Yes 

      • Go To  8

      No 

  5. CHECK IF RELATED DTC IS PRESENT 
    1. With the scan tool, check and record the Event Data.
      NOTE:

      Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.

      Do all the pressure switches read CLOSED in the Event Data?

      Yes 

      No 

      • Go To  6
  6. CHECK IF PRESSURE SWITCHES READ OPEN 

    In the Event Data recorded earlier, do all the pressure switches read open?

    Yes 

    • Go To  7

    No 

    • Go To  8
  7. CHECK FOR LOW LINE PRESSURE 

    In the Event Data recorded earlier, is the (actual) Line Pressure less than 276 kPa (40 psi), and significantly below the Desired (target) Line Pressure?

    Yes 

    No 

    • Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
    • Perform the 68RFE TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .
  8. CHECK IF IN PARK, NEUTRAL, OR REVERSE 

    In the Event Data recorded earlier, does the Event Data show the OD Pressure Switch DTC set while in Park, Neutral, or Reverse?

    Yes 

    • Go To  19

    No 

    • Go To  9
  9. CHECK IF THE OD PRESSURE SWITCH WAS OPEN 

    In the Event Data recorded earlier, did the OD Pressure Switch read OPEN?

    Yes 

    • Go To  10

    No 

    • Go To  15
  10. CHECK FOR LOW LINE PRESSURE 

    In the Event Data recorded earlier, is the Line Pressure less than 40 psi, and significantly below the Desired Line Pressure?

    Yes 

    No 

    • Go To  11
  11. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect all PCM harness connectors.
    3. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
    4. Measure the resistance between the (T9) OD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

      Is the resistance below 5.0 Ohms between the (T9) OD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

      Yes 

      No 

      • Go To  12
  12. CHECK TO SEE IF THE DTC RESETS 
    1. Reconnect all previously disconnected connectors.
    2. With the scan too, erase transmission DTCs.
    3. Test drive the vehicle, use the Event Data recorded earlier to help duplicate the conditions when the DTC originality set.

      Does the DTC P0871 reset?

      Yes 

      • Go To  13

      No 

      • Go To  23
  13. CHECK THE POWERTRAIN CONTROL MODULE 
    1. Remove the PCM/TCM Relay.
    2. Operate the vehicle in Drive.

      Is the transmission slipping while in Drive?

      Yes 

      • Go To  14

      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 68RFE TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .
  14. AIR CHECK TRANSMISSION CLUTCH OPERATION 
    1. Perform an Air Check Transmission Clutch Operation procedure in accordance with the Service Information.
      NOTE:

      The OD/Rev piston contains a small bleed orifice, a small amount of leakage between the OD and Reverse hydraulic clutch circuits is considered normal.

      Is there excessive air leakage in any clutch circuit?

      Yes 

      No 

  15. CHECK THE PCM AND WIRING 
    1. Turn the ignition off.
    2. Remove the Starter Relay from the PDC.
      CAUTION:

      Removal of the Starter Relay will prevent the vehicle from being started in gear.

      WARNING:

      The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury.

    3. Install Transmission Simulator. (special tool #8333B, Simulator, Transmission).
    4. Ignition on, engine not running.
    5. With the Transmission Simulator, turn the Pressure Switch selector switch to OD.
    6. With the scan tool, monitor the OD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.

      Did the state of the OD Pressure Switch change from OPEN to CLOSED while pressing the Test button?

      Yes 

      • Go To  16

      No 

      • Go To  19
  16. CHECK IF THE NO. 4 CHECK BALL IS CUT OR DAMAGED 
    1. With the scan tool, erase previously stored DTCs and test drive the vehicle, use the Event Data to help duplicate the conditions when the DTC originality set. Note any DTCs that may set.
    2. Remove the Transmission Valve Body in accordance with the Service Information.
    3. Check the No. 4 Check Ball for cuts or damage.

      Is the No. 4 Check Ball cut or damaged?

      Yes 

      No 

      • Go To  17
  17. CHECK THE SOLENOID SWITCH VALVE BORE IN VALVE BODY 
    1. Check the size of the Solenoid Switch Valve (SSV) plug bore in the main valve body. Check the diameter of the outer four (4) lands in the SSV bore. Maximum allowable diameter is 11.544 mm (0.454 in).

      Are any of the large SSV bore lands over the maximum allowable size?

      Yes 

      No 

      • Go To  18
  18. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY 

    Did the DTC P0871 reset during the test drive in the previous step?

    Yes 

    • Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
    • Perform the 68RFE TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

    No 

    • Go To  23
  19. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR AN OPEN 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Disconnect the Transmission Solenoid /TRS Assembly harness connector.
    4. Measure the resistance of the (T9) OD Pressure Signal circuit between the Solenoid/TRS Assembly harness connector and the appropriate terminal of the PCM C2 harness connector.

      Is the resistance above 5.0 Ohms?

      Yes 

      No 

      • Go To  20
  20. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Measure the resistance between ground and the (T9) OD Pressure Signal circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go To  21
  21. CHECK WIRING AND CONNECTORS 
    1. Using the schematics as a guide, inspect the wiring and connectors. Pay particular attention to all power and ground circuits.

      Were there any problems found

      Yes 

      No 

      • Go To  22
  22. CHECK THE POWERTRAIN CONTROL MODULE 
    1. Reconnect all previously disconnected connectors.
    2. Make sure all Event Data is recorded.
    3. With the scan tool, erase previously stored DTCs and test drive the vehicle, use the Event Data to help duplicate the conditions when the DTC originality set.

      Does the DTC P0871 reset?

      Yes 

      • 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 68RFE TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

      No 

      • Go To  23
  23. CHECK THE 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 wires while checking for shorted and open circuits.
    4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.

      Where there any problems found?

      Yes 

      No 

      • Test Complete.
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