LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 968 (Powertrain Control Module (Pcm) - Electrical Diagnostics - 66RFE Automatic Transmission - 2500 Hd & 3500 Hd) >> Diagnosis And Testing >> P0841-LR Pressure Switch Rationality >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR OTHER DTCS 
    1. Ignition ON, Engine Not Running.
    2. With the scan tool, check for transmission DTCs.

      Are any Transmission Loss of Prime, TCM Power Input and/or TIPM TCM Power Control Circuit DTCs present?

      Yes 

      • Refer to the DIAGNOSTIC CODE INDEX  or appropriate Electrical Diagnostics article and perform the appropriate diagnostic procedure. If the DTC P0944 is present, perform its respective test first.

      No 

      • Go To  2
  2. CHECK IF DTC P0841 IS PRESENT 
    1. With the scan tool, check the Event Data for P0841.
      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 DTC P0841?

      Yes 

      • Go To  3

      No 

  3. CHECK IF DTC SET IN REVERSE 

    Does the Event Data show DTC P0841 set while in Reverse?

    Yes 

    • Go To  10

    No 

    • Go To  4
  4. CHECK IF THE L/R PRESSURE SWITCH WAS CLOSED 

    Does the Event Data show the L/R Pressure Switch reading CLOSED when DTC P0841 set?

    Yes 

    • Go To  5

    No 

    • Go To  14
  5. CHECK THE PCM AND WIRING 
    1. Turn the ignition OFF to the LOCK position.
    2. Remove the Starter Relay.
      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 (special tool #8333B, Simulator, Transmission).
    4. Ignition ON, Engine Not Running.
    5. Turn the Pressure Switch selector to L/R on the Transmission Simulator.
    6. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.

      Did the L/R Pressure Switch state change from open to closed while pressing the Pressure Switch Test button on the Transmission Simulator?

      Yes 

      • Go To  6

      No 

      • Go To  10
  6. CHECK WIRING AND CONNECTORS 
    1. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
    2. Wiggle the wires while checking for shorted and open circuits.

      Were any problems found?

      Yes 

      No 

      • Go To  7
  7. CHECK IF DTC SET IN FIRST GEAR 

    In the Event Data recorded earlier, does the Event Data show the Present Gear as first gear when DTC P0841 set ?

    Yes 

    • Go To  8

    No 

  8. CHECK IF THE NO. 1 CHECK BALL IS CUT OR DAMAGED 
    1. Turn the ignition OFF to the LOCK position.
    2. Remove the Transmission Valve Body in accordance with the Service Information.
    3. Check the No. 1 Check Ball for any possible cuts or damage.

      Is the No. 1 Check Ball cut or damaged?

      Yes 

      • Replace the No. 1 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the L/R Clutch assembly. Refer to REMOVAL .
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .

      No 

      • Go To  9
  9. CHECK IF THE REVERSE CARRIER SNAP RING IS DISLODGED 
    1. Looking through the windows in the bottom of the case, check whether the snap ring at the front of the Reverse (center) Carrier has dislodged.
      NOTE:

      It may be necessary to pry the Input Annulus Gear Shell rearward to check this snap ring.

      Is the Reverse Carrier Snap Ring dislodged?

      Yes 

      No 

  10. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR AN OPEN 
    Fig 1: Checking L/R Pressure Control Circuit For An Open
    GC0148837Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition OFF to the LOCK position.
    2. Disconnect the (special tool #8333B, Simulator, Transmission) if connected in a previous step or disconnect the Transmission Solenoid/TRS Assembly harness connector.
    3. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position).
      CAUTION:

      Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the Miller tool 8815A to perform diagnosis.

    4. Measure the resistance of the (T50) L/R Pressure Control circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position).

      Is the resistance above 5.0 ohms?

      Yes 

      No 

      • Go To  11
  11. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Checking L/R Pressure Switch Sense Circuit Shorted To Ground
    GC0148836Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (T50) L/R Pressure Control circuit.

      Is the resistance below 5.0 ohms?

      Yes 

      No 

      • Go To  12
  12. CHECK THE PCM POWERS AND GROUNDS 
    1. 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.

      Were any problems found?

      Yes 

      No 

      • Go To  13
  13. CHECK IF THE DTC RESETS 
    1. With the scan tool, clear the DTC and road test the vehicle.
    2. Try to duplicate the conditions in which the DTC set using the Event Data recorded earlier.

      Did DTC P0841 reset?

      Yes 

      No 

      • Go To  17
  14. CHECK FOR LOW LINE PRESSURE 
    1. In the Event Data recorded earlier, compare the Line Pressure and the Desired Line Pressure.

      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 for low 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 Primary Oil Filter are OK, check the Main Regulator Valve in the Oil Pump in accordance with the Service Information. Refer to PUMP, TRANSMISSION OIL, DISASSEMBLY .
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .

      No 

      • Go To  15
  15. CHECK THE (T50) L/R PRESSURE CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 3: Checking L/R Pressure Control Circuit For A Short To Another Circuit
    GC0148835Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition OFF to the LOCK position.
    2. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
    3. Disconnect all PCM harness connectors.
    4. Measure the resistance between the (T50) L/R Pressure Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

      Is the resistance below 5.0 ohms between the (T50) L/R Pressure Control circuit and all other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

      Yes 

      No 

      • Go To  16
  16. CHECK IF DTC RESETS 
    1. With the scan tool, clear the DTC and road test the vehicle.
    2. Try to duplicate the conditions in which the DTC set using the Event Data recorded earlier.

      Did DTC P0841 reset?

      Yes 

      No 

      • Go To  17
  17. 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.

      Were any problems found?

      Yes 

      No 

      • Test Complete.
scientia non olet · About LEMON Manuals