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 OTHER DTCS
1. With the scan tool, read TCM DTCs and record on the repair order.
  Are TCM Power input DTCs set?
  
  Yes
  - Repair TCM power input DTCs. Refer to DTC INDEX - 2500 HD .
  No
  - Go To 2
CHECK FOR LINE PRESSURE DTCS
1. With the scan tool, read TCM DTCs.
  Are Line Pressure DTCs set?
  
  Yes
  - Repair Line Pressure DTCs. Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK FOR OTHER PRESSURE SWITCH DTCS
1. With the scan tool, read TCM DTCs.
  Are there two or more pressure switch rationality DTCs set in addition to P0871?
  
  Yes
  - Go To 5
  No
  - Go To 4
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read and record the Event Data.
  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 data for P0871?
  
  Yes
  - Go To 8
  No
  - Repair DTC(s) shown in Event Data. Refer to DIAGNOSTIC CODE INDEX .
CHECK IF PRESSURE SWITCHES READ CLOSED
1. With the scan tool, read and record the Event Data.
  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?
  
  Yes
  - Perform diagnostic procedure for DTC P0882 as if the DTC is Active. Refer to P0882-TCM POWER INPUT LOW .
  No
  - Go To 6
CHECK IF PRESSURE SWITCHES READ OPEN
In the Event Data recorded earlier, do all the pressure switches read OPEN?

Yes
- Go To 7
No
- Go To 8
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 weal for a spit, crack or improperly installed. If the filer and seal are OK, check the Main Regulator Valve in the Oil Pump. Refer to 66RFE AUTOMATIC TRANSMISSION - (SERVICE INFORMATION) - 2500 HD for the above procedures.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
No
- Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
CHECK IF IN DTC SET IN PARK, NEUTRAL, OR REVERSE
In the Event Data recorded earlier, does the Event Data show the OD Pressure Switch DTC set while in PARK, NEUTRAL or REVERSE?

Yes
- Go To 19
No
- Go To 9
CHECK IF THE OD PRESSURE SWITCH IS OPEN
In the Event Data recorded earlier, did the OD Pressure Switch read OPEN?

Yes
- Go To 10
No
- Go To 16
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. Check the Primary Oil Filter seal for a split, crack or improperly installed. Refer to 66RFE AUTOMATIC TRANSMISSION - (SERVICE INFORMATION) - 2500 HD for the proper installation procedure. If the fluid level and filter are OK, check the Main Regulator Valve in the Oil Pump.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
No
- Go To 11
CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Turn the Ignition off.
2. 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.
3. Important: The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
4. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
5. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
6. Check for continuity between the (T9) OD Pressure Signal circuit and all other circuits at the GPEC Diagnostic Adaptor.
  Is there continuity between the (T9) OD Pressure Signal circuit and any other circuit?
  
  Yes
  - Repair the (T9) OD Pressure Signal circuit for a short to another circuit.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 12
CHECK IF THE DTC RETURNS
1. Reconnect all previously disconnected connectors.
2. With the scan tool, erase DTCs.
3. 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.
4. With the scan tool, read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 13
  No
  - Go To 21
CHECK THE POWERTRAIN CONTROL MODULE (PCM)
1. Remove the Transmission Control Relay.
2. Operate the vehicle in DRIVE.
  Is the Transmission slipping while in DRIVE?
  
  Yes
  - Go To 15
  No
  - Go To 14
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 INTERNAL TRANSMISSION
1. Perform an Air Check Transmission Clutch Operation procedure in accordance with the Service Information.
  NOTE:
  The OD/Rev piston contains a small bleed orifice and a small amount of leakage between the OD and Reverse hydraulic clutch circuits is considered normal.
  
  Is there excessive air leakage in any clutch circuit?
  
  Yes
  - Check the OD/Rev piston seals and bleed orifice, reaction shaft support seal rings, dribbler orifice assemblies in the reaction shaft support and for poor machine on the pump valve body faces.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Repair the Valve Body. Check the OD Accumulator piston and seals, OD bleed orifice and No. 6 check ball cuts or damage. If no problems are found in the Valve Body, replace the Transmission Solenoid/TRS Assembly.
  - 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.
  
  NOTE:
  Failure to remove the Starter Relay can cause a Transmission - No Response condition.
3. Install Transmission Simulator (special tool #8333B, Simulator, Transmission).
4. Turn the ignition on.
5. With the Transmission Simulator, turn the Pressure Switch selector switch to OD.
6. With the scan tool, read the OD Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.
  Did the state of the OD Pressure Switch change from OPEN to CLOSED while pressing the Test button?
  
  Yes
  - Go To 17
  No
  - Go To 19
CHECK IF THE NO. 4 CHECK BALL IS CUT OR DAMAGED
1. Remove the Transmission Valve Body in accordance with the Service Information.
2. Check the No. 4 Check Ball for cuts or damage.
  Is the No. 4 Check Ball cut or damaged?
  
  Yes
  - Replace the No. 4 Check Ball and check for clutch debris in the transmission oil pan. If there is excessive debris, perform internal repairs to the OD Clutch Assembly.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 18
TRANSMISSION SOLENOID/TRS ASSEMBLY
Did DTC P0871 return during the test drive in the previous step?

Yes
- Replace the Transmission Solenoid/TRS Assembly in accordance with the Service Information.
- Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
No
- Go To 21
CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. 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.
3. Important: The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.
4. Connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
5. Disconnect the Transmission Solenoid/TRS Assembly harness connector
6. Measure the resistance of the (T9) OD Pressure Signal circuit between the Solenoid/TRS Assembly harness connector and the GPEC Diagnostic Adaptor.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the (T9) OD Pressure Signal circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 20
CHECK THE (T9) OD PRESSURE SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (T9) OD Pressure Signal circuit at the GPEC Diagnostic Adaptor.
  Is there continuity between ground and the (T9) OD Pressure Signal circuit?
  
  Yes
  - Repair the (T9) OD Pressure Signal circuit for a short to ground.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 21
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.