Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

DETERMINE IF RELATED TCM POWER INPUT DTCS ARE PRESENT
1. Using the scan tool, check for transmission DTCs.
  Are TCM Power Input DTCs present?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK IF THE DTC IS CURRENT
1. Using the scan tool, check the Event Data.
  Does the Event Data show data for DTC P0846?
  
  Yes
  - Go To 3
  No
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate symptom shown in the Event Data.
CHECK FOR MULTIPLE DTCS
1. Using the scan tool, check for transmission DTCs.
  Are there two or more related pressure switch rationality DTCs present in addition to P0846?
  
  Yes
  - Go To 4
  No
  - Go To 7
CHECK IF ALL PRESSURE SWITCHES READ CLOSED
1. Using the scan tool, check the Event Data for P0846.
  NOTE:
  Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.
  
  Do all the pressure switches read CLOSED in the Event Data for P0846?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the diagnostics for P0882.
  No
  - Go To 5
CHECK IF ALL PRESSURE SWITCHES READ OPEN
In the Event Data recorded earlier, do all the pressure switches read OPEN?

Yes
- Go To 6
No
- Go To 7
CHECK FOR LOW LINE PRESSURE
In the Event Data recorded earlier, is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure?

Yes
- Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to the Service Information for the above procedures.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK IF THE DTC SET IN PARK REVERSE OR NEUTRAL
1. Using the scan tool, check the Event Data for P0846.
  NOTE:
  Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.
  
  Does the Event Data show DTC P0846 set in Park, Reverse or Neutral?
  
  Yes
  - Go To 12
  No
  - Go To 8
CHECK IF THE 2C PRESSURE SWITCH READS CLOSED
In the Event Data recorded earlier, does the Event Data show the 2C Pressure Switch reading CLOSED?

Yes
- Go To 10
No
- Go To 9
COMPARE THE LINE PRESSURE TO THE DESIRED LINE PRESSURE
1. In the Event Data recorded earlier, compare the Line Pressure and the Desired Line Pressure.
  Is the Line Pressure less than 40 psi and significantly below the Desired Line Pressure?
  
  Yes
  - Repair as necessary to correct low line pressure. Check the fluid level and adjust as necessary. If the fluid level is OK, check the Primary Oil Filter seal for a split, crack or improperly installed. If the filter and seal are OK, check the Main Regulator Valve in the Oil Pump.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 15
CHECK THE PCM AND WIRING
1. Turn the ignition OFF.
2. Remove the Starter Relay from the PDC.
  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.
3. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
4. Ignition ON, Engine Not Running.
5. With the Transmission Simulator, turn the Pressure Switch selector switch to the 2C position.
6. Using the scan tool, monitor the 2C Pressure Switch while pressing the Pressure Switch test button on the Transmission Simulator.
  Did the state of the 2C Pressure Switch change while pressing the Pressure Switch Test button?
  
  Yes
  - Go To 11
  No
  - Go To 12
CHECK THE TRANSMISSION SOLENOID/TRS ASSEMBLY
1. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
2. Wiggle the wires while checking for shorted and open circuits.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition OFF.
2. Disconnect the Transmission Simulator (special tool #8333B, Simulator, Transmission).
3. Disconnect the PCM C1 harness connector.
4. Measure the resistance of the (T147) 2C Pressure Switch Sense circuit between the Transmission Solenoid/TRS Assembly harness connector and the appropriate terminal of the PCM C1 harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T147) 2C Pressure Switch Sense circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 13
CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (T147) 2C Pressure Switch Sense circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T147) 2C Pressure Switch Sense circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 14
CHECK THE (T147) 2C PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Measure the resistance between the (T147) 2C Pressure Switch Sense circuit and all the other circuits in the Transmission Solenoid/TRS Assembly harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T147) 2C Pressure Switch Sense circuit for a short to another circuit(s).
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Using the scan tool, perform a Quick Learn procedure. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL and MODULE, POWERTRAIN CONTROL, 6.7L DIESEL [ETK], REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK IF THE NO. 5 CHECK BALL IS CUT OR DAMAGED
1. Turn the Ignition OFF.
2. Remove the Valve Body Assembly in accordance with the Service Information.
3. Inspect the No. 5 check ball for any cuts or damage.
4. Inspect the 2C accumulator piston and seals and also the 2C tower seal on top of the valve body.
  Where any problems found?
  
  Yes
  - Repair as necessary. Check for excessive clutch debris in the transmission oil pan. If excessive clutch debris is present, repair 2C clutch as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 16
CHECK FOR EXCESSIVE FLUID LEAKAGE WITHIN 2C CLUTCH CIRCUIT
1. Air check the 2C Clutch hydraulic circuit. Refer to the Service Information.
  NOTE:
  This hydraulic clutch circuit contains a small bleed orifice. Small leakage is considered normal.
  
  Was there excessive air leakage in the 2C Clutch hydraulic circuit?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .