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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 430 (Powertrain Control Module (Pcm) - Electrical Diagnostics - 66RFE Automatic Transmission - 2500 Hd & 3500) >> Diagnosis And Testing >> P0871-Od Pressure Switch Rationality >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 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 TCM Power Input DTCs present?

      Yes 

      No 

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

      Are Line Pressure DTCs present?

      Yes 

      No 

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

      Are there two or more 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 PRESSURE SWITCHES READ CLOSED 
    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 

      • Refer to DIAGNOSIS AND TESTING  and perform the diagnostic procedure for P0882. Follow instructions as if the DTC is current.

      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 Line Pressure less than 40 psi and significantly below the Desired Line Pressure?

    Yes 

    • Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter weal for a spit, crack or improperly installed. If the filer and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures.
    • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

    No 

    • Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
    • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .
  8. CHECK IF IN DTC SET 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  18

    No 

    • Go To  9
  9. CHECK IF THE OD PRESSURE SWITCH IS 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 

    • Repair as necessary to correct low line pressure. Check the fluid level. Check the Primary Oil Filter seal for a split, crack or improperly installed. Refer to the Service Information for the proper installation procedure. If the fluid level and filter are OK, check the Main Regulator Valve in the Oil Pump.
    • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

    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 

      • Repair the (T9) OD Pressure Signal circuit for a short to another circuit(s).
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Go To  12
  12. CHECK 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 set.

      Does DTC P0871 reset?

      Yes 

      • Go To  13

      No 

      • Go To  22
  13. CHECK THE POWERTRAIN CONTROL MODULE (PCM) 
    1. Remove the Transmission Control Relay.
    2. Operate the vehicle in Drive.

      Is the transmission slipping while in Drive?

      Yes 

      • Go To  14

      No 

  14. CHECK INTERNAL TRANSMISSION 
    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 and 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 

      • Check the OD/Rev piston seals and bleed orifice, reaction shaft support seal rings, dribbler orifice assemblies in the reaction shaft support and for poor machine on the pump valve body faces.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Repair the Valve Body. Check the OD Accumulator piston and seals, OD bleed orifice and No. 6 check ball cuts or damage. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .
  15. CHECK 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.

      NOTE:

      Failure to remove the Starter Relay can cause a Transmission - No Response condition.

    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  18
  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 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 

      • Replace the No. 4 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the OD Clutch Assembly.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Go To  17
  17. TRANSMISSION SOLENOID/TRS ASSEMBLY 

    Did 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 TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

    No 

    • Go To  22
  18. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR AN OPEN 
    1. Turn the ignition OFF.
    2. Disconnect the PCM C1 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 C1 harness connector.

      Is the resistance above 5.0 ohms?

      Yes 

      • Repair the (T9) OD Pressure Signal circuit for an open.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Go To  19
  19. 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 

      • Repair the (T9) OD Pressure Signal circuit for a short to ground.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Go To  20
  20. 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 any problems found

      Yes 

      • Repair as necessary.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Go To  21
  21. CHECK IF DTC RESETS 
    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 set.

      Does DTC P0871 reset?

      Yes 

      No 

      • Go To  22
  22. 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 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 set.

      Where any problems found?

      Yes 

      • Repair as necessary.
      • Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE  .

      No 

      • Test Complete.
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