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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 734 ((Powertrain Control Module (Pcm) - Electrical Diagnostics - 66RFE Automatic Transmission - 2500 Hd & 3500 Hd)) >> Diagnosis And Testing >> P0868-Line Pressure Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR RELATED DTCS 
    1. With the scan tool, read DTCs.

      Is DTC P0933 present?

      Yes 

      No 

      • Go To  2
  2. CHECK IF THE DTC IS CURRENT 
    1. With the scan tool, read DTCs.

      Is the status Active or is the Starts Since Set counter 2 or less for this DTC?

      Yes 

      • Go To  3

      No 

      • Go To  11
  3. CHECK THE LINE PRESSURE SENSOR CONNECTION 
    1. Ignition ON, Engine Not Running.
    2. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission.

      Did the Line Pressure reading on the scan tool CHANGE to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward?

      Yes (value was higher and changed to 207 kPa (30 psi) or 0.7 volts) 

      • Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary.
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST  .

      No (value is higher than 207 kPa (30 psi) or 0.7 volts and did not change or the value was already 207 kPa (30 psi) or 0.7 volts and did not change) 

      • Go To  4
  4. 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 the (special tool #8333B, Simulator, Transmission).
    4. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch.
    5. Ignition ON, Engine Not Running.
    6. With the scan tool, monitor the Line Pressure during the following steps.
    7. Using the Transmission Simulator, set the rotary knob to each of the three line pressure positions.
      NOTE:

      All three scan tool Line Pressure readings should be steady and ± 14 kPa (2.0 psi) or 0.1 volts of the reading specified on the Transmission Simulator.

      Did the Line Pressure read within ± 14 kPa (2.0 psi) or 0.1 volts in all three positions?

      Yes 

      • Go To  5

      No 

      • Go To  7
  5. CHECK THE LINE PRESSURE SENSOR 
    1. Turn the ignition OFF to the LOCK position.
    2. Disconnect the (special tool #8333B, Simulator, Transmission) and reconnect all previously disconnected connectors.
    3. Install the (special tool #8259, Adapter, Pressure Test), and the (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.).
    4. Start the engine in park.
    5. Monitor the line pressure readings of both the scan tool and the pressure gauge and compare the two readings.

      Is the line pressure gauge reading within 34 kPa (5 psi) of the scan tool reading?

      Yes 

      • Go To  6

      No 

      • Replace the Line Pressure Sensor in accordance with the Service Information.
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST  .
  6. CHECK FOR A PLUGGED TRANSMISSION OIL FILTER 
    1. Turn the ignition OFF to the LOCK position.
    2. Remove and inspect the Transmission Oil Pan for excessive debris in accordance with the Service Information.
    3. Remove and inspect the Primary Oil Filter in accordance with the Service Information.
      NOTE:

      Make sure the Primary Transmission Oil Filter and/or O-ring is not cracked or split.

      Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked or plugged?

      Yes 

      • Repair the plugged, cracked or split Primary Transmission Oil Filter and/or O-ring. If the Primary Transmission Oil Filter is plugged, refer to DIAGNOSIS AND TESTING and the Service Information for the proper Hydraulic repair procedure.
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST  .

      No 

      • Repair internal transmission and inspect the Transmission Oil Pump in accordance with the Service Information and replace if necessary. If no problem is found, replace the Solenoid/TRS Assembly.
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST  .
  7. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking 5-Volt Supply Circuit
    GC0090598Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the (special tool #8333B, Simulator, Transmission).
    2. Reconnect all previously disconnected connectors except the Line Pressure Sensor harness connector.
    3. Ignition ON, Engine Not Running.
    4. Measure the voltage of the (F856) 5-volt Supply circuit in the Line Pressure Sensor harness connector.

      Is the voltage above 5.5 volts?

      Yes 

      No 

      • Go To  8
  8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN 
    Fig 2: Checking 5-Volt Supply Circuit
    GC0090593Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition OFF to the LOCK position.
    2. Disconnect the PCM C1 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.

    3. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor 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  9
  9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    Fig 3: Checking 5-Volt Supply Circuit
    GC0090594Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between ground and the (F856) 5-volt Supply circuit.

      Is the resistance below 5.0 ohms?

      Yes 

      No 

      • Go To  10
  10. CHECK THE (T118) LINE PRESSURE VARIABLE FORCE SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT 
    Fig 4: Checking Line Pressure Variable Force Solenoid Control Circuit
    GC0090599Courtesy 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 (T118) Line Pressure Variable Force Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

      Is the resistance below 5.0 ohms between the (T118) Line Pressure Variable Force Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

      Yes 

      • Repair the (T118) Line Pressure Variable Force Solenoid Control circuit for a short to another circuit(s).
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE 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 and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn.
      • Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST  .
  11. 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 set.

      Were any problems found?

      Yes 

      No 

      • Test Complete.
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