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.

CHECK FOR RELATED DTCS
1. With the scan tool, read TCM DTCs and record on the repair order.
  Are any other Gear Ratio Error, TCC Out of Range or Line Pressure related DTCs present?
  
  Yes
  - Repair any Gear Ratio Error, TCC Out of Range or Line Pressure DTCs before continuing the P0933 diagnostics. If P0934 or P0935 is set, perform that diagnostic procedure first. Refer to P0934-LINE PRESSURE SENSOR CIRCUIT LOW or P0935-LINE PRESSURE SENSOR CIRCUIT HIGH .
  No
  - Go To 2
COMPARE ACTUAL LINE PRESSURE TO DESIRED LINE PRESSURE
CAUTION:
Apply the parking brake.
1. Start the Engine.
2. With the scan tool, read the Line Pressure, Desired Line Pressure and the TPS degrees.
3. While firmly applying the brakes, place the shifter in reverse, then slowly press the accelerator pedal to a TPS angle of 15°.
4. Compare the Line Pressure reading to the Desired Line Pressure reading on the scan tool.
  Does the Line Pressure stay within ± 34 kPa (5 psi) of the Desired Line Pressure?
  
  No
  - Go To 3
  Yes
  - Go To 7
CHECK LINE PRESSURE CONNECTOR AND WIRING
1. Turn the ignition on.
2. With the scan tool, read the Line Pressure Sensor voltage while wiggling the wiring harness and connectors pertaining to the Line Pressure Sensor and the Transmission Solenoid/TRS Assembly.
  Did the voltage remain steady while wiggling the wiring harness and connectors?
  
  Yes
  - Go To 4
  No
  - Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
CHECK 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.
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. Turn the ignition on.
6. With the scan tool, read the Line Pressure during the following step.
7. With the Transmission Simulator, turn the selector switch to each of the three Line Pressure positions.
  NOTE:
  All three scan tool Line Pressure readings should be steady and ±14 kPa or 2.0 psi of the reading specified on the Transmission Simulator.
  
  Does the Line Pressure on the scan tool fluctuate up and down more than 69 kPa or 10 psi at any of the 3 line pressure positions on the Transmission Simulator?
  
  Yes
  - Go To 5
  No
  - Go To 6
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all PCM harness connectors.
  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.
2. Important: The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
4. Disconnect all related in-line harness connections (if equipped).
5. Disconnect the related component harness connectors.
6. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
7. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
10. With the scan tool, erase DTCs.
11. Using the recorded Event and Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
12. With the scan tool, read PCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module (PCM) in accordance with the Service information. 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 .
  No
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  - Test complete.
CHECK THE LINE PRESSURE SENSOR
1. Turn the ignition off
2. Disconnect the Transmission Simulator (special tool #8333B, Simulator, Transmission) and reconnect all previously disconnected connectors.
3. Install the Line Pressure Adaptor (special tool #8259, Adapter, Pressure Test), and the 0-300 psi Pressure Gauge (special tool #C-3293-SP, Gauge, Pressure 0-300 P.S.I.).
4. Start the Engine in PARK.
5. Monitor the line pressure readings of both the scan tool and the pressure gauge and compare the two readings.
  Is the line pressure gauge reading within 34 kPa (5 psi) of the scan tool reading?
  
  Yes
  - Repair internal Transmission and inspect the oil pump per the Service information and replace if necessary. If no problems are found, replace the Transmission Solenoid/TRS Assembly - possible cause is the Pressure Control Solenoid is stuck.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Replace the Line Pressure Sensor in accordance with the Service Information.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
CHECK WIRING AND CONNECTORS
1. The conditions necessary to set the 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. Check for any Service Bulletins that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the TRANSMISSION VERIFICATION TEST. (Refer to 66RFE TRANSMISSION VERIFICATION TEST ).
  No
  - Test complete.