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.

DETERMINING IF RELATED DTCS ARE PRESENT
1. With the scan tool, check for transmission DTCs
  Is DTC P0841 present?
  
  Yes
  - Refer to P0841-LR PRESSURE SWITCH RATIONALITY and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK TO SEE IF DTC P1776 IS CURRENT
1. With the scan tool, Check the Starts Since Set counter.
  NOTE:
  NOTE: This counter only applies to the last DTC set.
  
  Is the Starts Since Set counter 2 or less?
  
  Yes
  - Go To 3
  No
  - Go To 7
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.
  
  NOTE:
  Failure to remove the Starter Relay can cause a Transmission - No Response condition.
3. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
4. Turn the Ignition ON, Engine not running.
5. With the Transmission Simulator, turn the Pressure Switch selector switch to the L/R position.
6. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.
  Did the state of the L/R Pressure Switch change while pressing the Pressure Switch Test button?
  
  Yes
  - Go To 4
  No
  - Go To 5
SOLENOID SWITCH VALVE
1. Remove the Valve Body in accordance with the Service Information.
2. Inspect the Solenoid Switch Valve and Plugs for sticking in the bore and/or wear.
  Were any problems found?
  
  Yes
  - Clean and repair as necessary in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 7
L/R PRESSURE SWITCH SENSE CIRCUIT OPEN
1. Turn the Ignition OFF.
2. Disconnect the Transmission Simulator (special tool #8333B, Simulator, Transmission).
3. Disconnect the PCM C1 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 (T50) L/R Pressure Switch Sense circuit between the appropriate terminal of the GPEC Diagnostic Adaptor and the Solenoid/TRS Assembly harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORTED TO GROUND
1. Measure the resistance between ground and the (T50) L/R Pressure Switch Sense circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for a short to ground.
  - 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. Refer to MODULE, POWERTRAIN CONTROL, (PCM) 5.7L / 6.4L, REMOVAL or MODULE, POWERTRAIN CONTROL, (PCM) 6.7L DIESEL, REMOVAL .
  - Perform the 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. This DTC can also be set by the Solenoid Switch Valve intermittently sticking in it's bore under extreme temperature conditions or by a worn Solenoid Switch Valve or Plugs.
5. 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.