Diagnostic Test

WARNING: This page is about a different car, the 2017 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 6
CHECK THE PCM AND WIRING
1. Turn the Ignition OFF.
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. Failure to do so can result in possible serious or fatal injury.
3. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
4. Turn the Ignition ON, Engine not running.
5. With the scan tool, 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 of the pressure reading specified on Transmission Simulator.
  
  Does the 3 line pressures on the scan tool match the Line pressure readings on the Transmission Simulator?
  
  Yes
  - Replace the Line Pressure Sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K900) SENSOR GROUND CIRCUIT FOR AN OPEN
1. Turn the Ignition OFF.
2. Disconnect the Transmission Simulator (special tool #8333B, Simulator, Transmission)
3. Disconnect the PCM C2 harness connector.
  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 GPEC Diagnostic Adaptor to perform the diagnosis.
4. Important: The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
5. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
6. Measure the resistance of the (K900) Sensor Ground circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the GPEC Diagnostic Adaptor.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (K900) Sensor Ground circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN
1. Measure the resistance of the (T38) Line Pressure Sensor Signal circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the GPEC Diagnostic Adaptor.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T38) Line Pressure Sensor Signal circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the Ignition ON, Engine not running.
2. Measure the voltage of the (T38) Line Pressure Sensor Signal circuit.
  Is the voltage above 5.5 volts?
  
  Yes
  - Repair the (T38) Line Pressure Sensor Signal circuit for a short to voltage.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 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 TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
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.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Test Complete.