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.

CHECK FOR RELATED DTCS
1. With the scan tool, check for transmission DTCs
  Are any Loss of Prime, TCM Power Control Circuit and/or TCM Power Input DTCs present also?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure. If DTC, P0944-LOSS OF PRIME is present, perform its respective test first.
  No
  - Go To 2
CHECK IF DTC P0755 IS PRESENT
1. With the scan tool, read DTCs.
  Is DTC P0755 present?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 3
CHECK IF DTCS P0732, P0735 AND/OR P0846 ARE PRESENT
1. With the scan tool, read DTCs.
  Are DTCs P0732, P0735 and/or P0846 present?
  
  Yes
  - Go To 12
  No
  - Go To 4
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 5
  No
  - Go To 15
CHECK IF THE LINE PRESSURE STAYS THE SAME
1. Start the engine.
2. Warm the transmission to 82° C or 180° F.
3. Firmly apply the brakes.
4. With the scan tool, monitor the Line Pressure during the following step.
5. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure reading. Allow the pressure to stabilize for at least five seconds in each range.
  Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 psi in each position?
  
  Yes
  - Go To 6
  No
  - Go To 10
CHECK THE LINE PRESSURE SENSOR CONNECTION
1. Ignition ON, Engine Not Running.
2. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector inwards towards the Transmission.
  Did the Line Pressure reading on the scan tool change to about 207 kPa (30 psi) or 0.7 volts when the connector was pushed inward?
  
  Yes
  - Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect the terminals and repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 7
CHECK THE LINE PRESSURE SENSOR OPERATION
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. With the Transmission Simulator select the "OFF" position on the "Input/Output Speed" switch.
5. Ignition ON, Engine Not Running.
6. With the scan tool, monitor the Line Pressure while turning the Pressure Switch selector to each of the three line pressure positions on the Transmission Simulator.
  NOTE:
  All three scan tool Line Pressure readings should be steady and ±14 kPa (2.0 psi) or 1.0 volt of the reading specified on the Transmission Simulator.
  
  Did the scan tool Line Pressure readings match the specified readings on the Transmission Simulator and remain steady in all three positions?
  
  Yes
  - Replace the Line Pressure Sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 8
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN
1. Turn the ignition OFF.
2. Disconnect Transmission Simulator.
3. Disconnect the PCM C1 harness connector.
4. Measure the resistance of the (F856) 5-volt Supply circuit between the Line Pressure Sensor harness connector and the appropriate terminal of the PCM C1 harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 9
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (F856) 5-volt Supply circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (F856) 5-volt Supply circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 the and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL and MODULE, POWERTRAIN CONTROL, 6.7L DIESEL [ETK], REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
COMPARE SCAN TOOL TO THE PRESSURE GAUGE
1. Turn the ignition OFF.
2. Connect the Line Pressure Adapter (special tool #8259, Adapter, Pressure Test) and 0-300 psi Test Gauge (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.). Refer to the Service Information for proper installation procedure.
  CAUTION:
  Apply parking brake.
3. Start the engine.
4. In the following steps, compare the scan tool Line Pressure to the Pressure Gauge readings in each gear.
  CAUTION:
  Do not overheat transmission.
5. With the gear selector in park, raise the RPM to 1500 and compare line pressure readings.
6. Firmly apply the brakes, move the gear selector into reverse, raise the RPM to 1500 and compare the line pressure readings.
7. Firmly apply the brakes, move the gear selector into drive, raise the RPM to 1500 and compare the line pressure readings.
  Does the scan tool Line Pressure readings match the Pressure Gauge readings ± 10 psi?
  
  Yes
  - Go To 11
  No
  - Replace the Line Pressure Sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK WIRING AND CONNECTORS
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 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. Remove the Line Pressure Adapter (special tool #8259, Adapter, Pressure Test) and 0-300 psi Test Gauge (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.).
4. Install the Transmission Simulator (special tool #8333B, Simulator, Transmission).
5. On the Transmission Simulator, turn the Pressure Switch selector switch to 2C.
6. Ignition ON, Engine Not Running.
7. With the scan tool, monitor the 2C Pressure Switch state while pressing and holding the Pressure Switch test button and wiggling the wire harness and connectors that pertain to the 2C Pressure Switch.
  Did the 2C Pressure Switch state change to closed and remain closed while wiggling the wires?
  
  Yes
  - Go To 12
  No
  - Go To 14
CHECK FOR EXCESSIVE DEBRIS
1. Turn the ignition OFF.
2. Remove the Transmission Simulator (special tool #8333B, Simulator, Transmission).
3. Remove and inspect the Transmission Oil Pan in accordance with the Service Information.
  Does the Transmission Oil Pan contain excessive debris or contamination?
  
  Yes
  - Repair the cause of the excessive debris in the Transmission Oil Pan.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 13
CHECK THE 2C HYDRAULIC CLUTCH CIRCUIT
1. Remove the Valve Body and air check the 2C clutch hydraulic circuit in the 2C/4C clutch retainer for leakage in accordance with the Service Information.
  NOTE:
  The 2C hydraulic clutch circuit contains a small bleed orifice and a small amount of air leakage is normal.
  
  Was there excessive air leakage noticed during the air check?
  
  Yes
  - Repair as necessary. Check the 2C clutch piston, piston seals and bleed orifice assembly.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Disassemble and inspect the Valve Body and repair as necessary. Inspect the 2C Accumulator piston and seals. Check for an extra check ball downstream from the No. 7 check ball pocket and repair as necessary. If no problems are found in the Valve Body, 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 A SHORT TO ANOTHER CIRCUIT
1. Disconnect all PCM harness connectors.
2. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
  NOTE:
  Make sure the Transmission Solenoid/TRS Assembly harness connector is disconnected.
3. Measure the resistance between the (T147) 2C Pressure Signal circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.
  Is the resistance below 5.0 ohms between the (T147) 2C Pressure Signal circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?
  
  Yes
  - Repair the (T147) 2C Pressure Signal circuit for a short to another circuit(s).
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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, REMOVAL and MODULE, POWERTRAIN CONTROL, 6.7L DIESEL [ETK], REMOVAL .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
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.
5. If the Event Data shows DTC P0845 set while the Line Pressure was significantly below the Desired Line Pressure reading, check for causes of low line pressure (low fluid level, broken or mis-installed primary oil filter or filter seal, sticking Main Regulator Valve in the Pump Valve Body etc.). If the data shows the DTC set while the Line Pressure reading was significantly higher than the Desired Line Pressure, check the Line Pressure Sensor and related wiring.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Test Complete.