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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 >> P0876-UD 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 IF RELATED DTCS ARE PRESENT 
    1. With the scan tool, read DTCs.

      Is there any Loss of Prime, TIPM TCM Power Control circuit, TCM Power Input and/or Line Pressure Sensor DTCs present?

      Yes 

      • For the TIPM DTCs, and perform the appropriate diagnostic procedure. Refer to appropriate Electrical Diagnostic Information . If a Loss of Prime DTC is present, perform its respective test first.

      No 

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

      Are there two or more other pressure switch rationality DTCs present in addition to P0876?

      Yes 

      • Go To  3.

      No 

      • Go To  4.
  3. CHECK IF ALL PRESSURE SWITCHES READ CLOSED 
    1. With the scan tool, read and record all 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 all pressure switches reading CLOSED?

      Yes 

      • Refer to Diagnosis and Testing  and perform the diagnostics for P0882 . Perform the diagnostics as if the DTC is current.

      No 

      • Go To  4.
  4. CHECK FOR OTHER DTCS 
    1. With the scan tool, read DTCs.

      Is the DTC P2704 present also?

      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  5.
  5. CHECK THE Event Data 

    In the Event Data recorded earlier, does the Event Data display information for the DTC P0876?

    Yes 

    • Go To  6.

    No 

  6. CHECK IF EVENT DATA WAS SET IN PARK, NEUTRAL OR REVERSE 

    In the Event Data recorded earlier, did the DTC P0876 set in Park, Neutral, or Reverse?

    Yes 

    • Go To  10.

    No 

    • Go To  7.
  7. CHECK THE UD PRESSURE SWITCH STATUS 

    In the Event Data recorded earlier, did the DTC P0876 set with the UD Pressure Switch closed?

    Yes 

    • Go To  10.

    No 

    • Go To  8.
  8. CHECK THE 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 seal for a split, crack, or improperly installed. If the filter 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 

    • Go To  9.
  9. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 1: Measuring Resistance Between UD Pressure Switch Sense Circuit & All Other Circuits In Transmission Solenoid/TRS Assembly Harness Connector
    GC0111747Courtesy 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 (T29) UD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

      Is the resistance below 5.0 Ohms between the (T29) UD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

      Yes 

      • Repair the (T29) UD Pressure Signal circuit for a short to another circuit(s).
      • 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  .
  10. CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR 
    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 the 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 the UD position.
    6. With the scan tool, monitor the UD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.

      Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button?

      Yes 

      • Go To  14.

      No 

      • Go To  11.
  11. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR AN OPEN 
    Fig 2: Checking UD Pressure Switch Sense & Signal Circuit For Open
    GC0137265Courtesy of CHRYSLER LLC
    1. Turn the ignition off to the lock position.
    2. Disconnect the Transmission Simulator (special tool #8333A, Simulator, Transmission).
    3. Disconnect the PCM C2 harness connector.
    4. Measure the resistance of the (T29) UD Pressure Signal circuit between the Transmission 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  12.
  12. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    Fig 3: Checking UD Pressure Switch Sense & Signal Circuit For Short To Ground
    GC0137266Courtesy of CHRYSLER LLC
    1. Measure the resistance between ground and the (T29) UD Pressure Signal circuit.

      Is the resistance below 5.0 Ohms?

      Yes 

      No 

      • Go To  13.
  13. CHECK THE (T29) UD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 4: Measuring Resistance Between UD Pressure Switch Sense Circuit & All Other Circuits In Transmission Solenoid/TRS Assembly Harness Connector
    GC0111747Courtesy of CHRYSLER LLC
    1. Disconnect all PCM harness connectors.
      NOTE:

      Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected.

    2. Measure the resistance between the (T29) UD Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

      Is the resistance below 5.0 Ohms between the (T29) UD Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

      Yes 

      • Repair the (T29) UD Pressure Signal circuit for a short to another circuit(s).
      • Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .

      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 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. PERFORM A WIGGLE TEST USING THE TRANSMISSION SIMULATOR 
    1. Perform the steps in the previous test while wiggling the wiring harness and connectors pertaining to the UD Pressure Switch.

      Did the state of the UD Pressure Switch change while pressing the Pressure Switch Test button?

      Yes 

      No 

      • Go To  15.
  15. CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY FOR A SHORT TO GROUND 
    Fig 5: Checking Transmission Solenoid/TRS Assembly For Short To Ground
    GC0137267Courtesy of CHRYSLER LLC
    1. Disconnect the Transmission Simulator and reconnect the Transmission Solenoid/TRS Assembly harness connector.
    2. Disconnect the PCM C2 harness connector.
    3. Measure the resistance between ground and the (T29) UD Pressure Signal circuit in the appropriate terminal of the PCM C2 harness connector.

      Is the resistance below 5.0 Ohms?

      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  16.
  16. CHECK IF THE DTC RESETS 
    1. Reconnect all previously disconnected connectors.
    2. With the scan tool, erase all transmission DTCs.
    3. Test drive the vehicle. Using the Event Data recorded earlier, try to duplicate the conditions in which the DTC originally set.

      Does the DTC P0876 reset?

      Yes 

      • Go To  17.

      No 

      • Go To  18.
  17. CHECK FOR A CUT NO. 2 CHECK BALL 
    1. Remove the Valve Body in accordance with the Service Information.
    2. Check the No. 2 check ball for cuts or damage.

      Is the No. 2 check ball cut or damaged?

      Yes 

      • Replace the No. 2 check ball. Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary.
      • 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. Check for excessive clutch debris in the oil pan. If excessive debris is present, check the UD Clutch and repair as necessary.
      • Perform the appropriate TRANSMISSION VERIFICATION TEST. Refer to 68RFE TRANSMISSION VERIFICATION TEST  .
  18. CHECK FOR 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.

      Were there any problems found?

      Yes 

      No 

      • Test Complete.
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