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.

DETERMINE IF RELATED DTCS ARE PRESENT
1. With the scan tool, read DTCs.
  Are any line pressure sensor or throttle position sensor DTCs present?
  
  Yes
  - Perform the appropriate diagnostic procedure.
  No
  - Go To 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 5
TRANSMISSION TEMPERATURE SENSOR
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. Ignition ON, Engine Not Running.
5. With the Transmission Simulator, turn the Input/Output switch to OFF.
6. With the scan tool, monitor the TRANS TEMP VOLTS while turning the Thermistor Voltage switch to all three positions on the Transmission Simulator.
7. Compare the scan tool readings with the numbers listed on the Transmission Simulator.
  Do the readings on the Transmission Simulator match the scan tool readings ± 0.2 volts?
  
  Yes
  - Replace Transmission Solenoid/TRS Assembly in accordance with the Service Information.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
(T54) TRANSMISSION TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Fig 1: Checking Transmission Temperature Sensor Signal Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition OFF to the LOCK position.
2. Disconnect the (special tool #8333B, Simulator, Transmission).
3. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position).
  NOTE:
  Check connectors - Clean/repair as necessary.
  
  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 (T54) Transmission Temperature Sensor Signal circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T54) Transmission Temperature Sensor Signal circuit for a short to ground.
  - Perform the 66RFE 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 66RFE TRANSMISSION VERIFICATION TEST. Refer to 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.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Test Complete.