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.

CHECK DTCS
1. With the scan tool, read DTCs.
  Are any TIPM TCM Power Control Circuit or TCM Power Input DTCs present?
  
  Yes
  - Refer to appropriate Electrical Diagnostics article and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK IF DTC P0750 IS PRESENT
1. Ignition ON, Engine Not Running.
2. With the scan tool, erase all Transmission DTCs.
3. Turn the ignition OFF to the LOCK position.
4. 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.
5. Install the (special tool #8333B, Simulator, Transmission).
6. Ignition ON, Engine Not Running.
7. With the scan tool, actuate the L/R Solenoid.
8. Monitor the L/R Solenoid LED on the Transmission Simulator.
  Did the L/R Solenoid LED on the Transmission Simulator blink on and off?
  
  Yes
  - Go To 3
  No
  - Go To 5
CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY
1. With the Transmission Simulator connected, continue to actuate the L/R solenoid for two minutes.
2. After two minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs.
  Did DTC P0750 reset during the actuation test?
  
  Yes
  - Go To 5
  No
  - Go To 4
CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY
1. With the Transmission Simulator connected, continue to actuate the L/R solenoid for another two minutes while wiggling the related wiring harness and connectors.
2. Stop the actuation and check for transmission DTCs.
  Did DTC P0750 reset during the actuation test?
  
  Yes
  - Repair wiring harness or connectors as necessary.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information. Note: Do NOT replace the entire Valve Body.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT

Fig 1: Checking L/R Solenoid Control Circuit For A Short To Another Circuit
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 harness connectors.
4. Measure the resistance between the (T20) L/R Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.
  Is the resistance below 5.0 ohms between the (T20) L/R Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?
  
  Yes
  - Repair the (T20) L/R Solenoid Control circuit for a short to another circuit(s).
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR AN OPEN

Fig 2: Checking L/R Solenoid Control Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Connect the (special tool #8815A, Kit, NGC, 38 Position) to the PCM C4 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 Miller tool 8815A to perform diagnosis.
2. Measure the resistance of the (T20) L/R Solenoid 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
  - Repair the (T20) L/R Solenoid Control circuit for an open.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 7
CHECK THE (T20) L/R SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking L/R Solenoid Control Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (T20) L/R Solenoid Control circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T20) L/R Solenoid Control 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 .