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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 68RFE Automatic Transmission)) >> Diagnosis and Testing >> P0871-Od Pressure Switch Rationality >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. 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 TIPM TCM Power Control Circuit or TCM Power Input DTCs present?

      Yes 

      • Refer to appropriate Electrical Diagnostic Information and perform the appropriate diagnostic procedure .

      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 

      • Refer to Diagnosis and Testing  and perform diagnostics 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 (actual) Line Pressure less than 276 kPa (40 psi), and significantly below the Desired (target) Line Pressure?

    Yes 

    • Repair as necessary to correct low line pressure. Check fluid level and adjust as necessary. If 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 appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

    No 

    • Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
    • Perform the appropriate 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 

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

    No 

    • Go To  11.
  11. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 1: Measuring Resistance Between OD Pressure Switch Sense Circuit & All Other Circuits In Transmission Solenoid/TRS Assembly Harness Connector
    GC0111742Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    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 appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

      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 appropriate 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 

      • 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. Refer to the Service Information.
      • Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

      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. Refer to the Service Information for proper repair procedures.
      • Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .
  15. CHECK THE PCM AND WIRING 
    1. Turn the ignition off to the lock position.
    2. Remove the Ignition Switch Feed fuse from the TIPM.
      CAUTION:

      Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear.

      WARNING:

      The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in possible serious or fatal injury.

    3. Install Transmission Simulator (special tool #8333A, 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 AND/OR NO. 6 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 and No. 6 Check Balls for cuts or damage.

      Is the No. 4 and/or No. 6 Check Ball cut or damaged?

      Yes 

      • Replace the No. 4 and/or No. 6 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. Refer to the Service Information for proper repair procedures.
      • Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

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

    No 

    • Go To  23.
  19. CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR AN OPEN 
    Fig 2: Checking OD Pressure Signal Circuit For Open
    GC0137263Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    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 
    Fig 3: Checking OD Pressure Signal Circuit For Short To Ground
    GC0137264Courtesy of CHRYSLER LLC
    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 appropriate 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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