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.

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 2
  No
  - Go To 7
CHECK THE PCM AND WIRING
1. Turn the ignition OFF to the LOCK position.
2. Remove the Ignition Switch Feed fuse from the Totally Integrated Power Module (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. Ignition ON, Engine Not Running.
5. With the scan tool, under Transmission Sensors, monitor the Line Pressure.
6. Using the Transmission Simulator, set the rotary switch to each of the three line pressure positions.
  NOTE:
  The readings should be within ±14 kPa (2.0 psi) on the scan tool to the pressure readings specified on Transmission Simulator.
  
  Does the Line Pressure on the scan tool match the line pressures on the Transmission Simulator?
  
  Yes
  - Replace the Line Pressure Sensor in accordance with the Service Information.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 1: Checking Line Pressure Sensor Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition OFF to the LOCK position.
2. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position).
3. Disconnect the (special tool #8333B, Simulator, Transmission).
  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 between ground and the (T38) Line Pressure Sensor Signal circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T38) Line Pressure Sensor Signal circuit for a short to ground.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

Fig 2: Checking Line Pressure Sensor Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 harness connector.
2. Measure the resistance of the (T38) Line Pressure Sensor Signal 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
  - Repair the (T38) Line Pressure Sensor Signal circuit for an open.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN

Fig 3: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C1 harness connector.
2. 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 below 5.0 ohms?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for an open.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND

Fig 4: Checking 5-Volt Supply Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the PCM C1 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position).
2. Measure the resistance between ground and the (F856) 5-volt Supply circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for a short to ground.
  - 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 .
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.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to the 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Test Complete.