Diagnostic Test

WARNING: This page is about a different car, the 2020 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read DTCs and record on the repair order.
2. Record the Environmental Data.
3. With the scan tool, erase DTCs.
4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read Drivetrain Control Module (DTCM) DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK REAR DRIVELINE COMPONENTS FOR PROPER OPERATION
1. Place vehicle on hoist and raise the wheels off ground. Refer to HOISTING, STANDARD PROCEDURE .
2. Put the vehicle in Sport Mode, then operate with the Transmission in DRIVE.
3. Visually confirm that the Rear Prop Shaft is spinning.
4. Visually confirm that both Rear Half Shafts are not disconnected physically damaged and they are capable of spinning the rear wheels.
  Were any problems found with the Rear Prop Shaft or Rear Half Shafts?
  
  Yes
  - Repair as necessary in accordance with the Service Information.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - Go To 3
CHECK THE REAR DRIVELINE MODULE (RDM) HYDRAULIC FLUID LEVEL
1. Check the RDM hydraulic fluid level in accordance with the Service Information. Refer to FLUID, HYDRAULIC, STANDARD PROCEDURE .
  Is the RDM hydraulic fluid at the proper level?
  
  Yes
  - Go To 4
  No
  - Inspect the RDM for hydraulic fluid leaks and repair as necessary in accordance with the Service Information.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
CHECK FOR AIR IN THE HYDRAULIC SYSTEM
NOTE:
Air in the hydraulic system can also cause this DTC to set. A scan tool is required to bleed the hydraulic system.
1. Perform the hydraulic fluid bleed procedure. Refer to FLUID, HYDRAULIC, STANDARD PROCEDURE .
2. If air in the hydraulic system was suspected, inspect the hydraulic system for conditions that could cause air in the system and repair as necessary.
  Were any problems found?
  
  Yes
  - Repair and bleed the hydraulic system as necessary in accordance with the Service Information.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - Go To 5
CHECK FOR LOW HYDRAULIC PRESSURE AND INTERNAL LEAKS
1. Remove the RDM Hydraulic Pump Motor in accordance with the Service Information. Refer to MOTOR, PUMP, REMOVAL .
2. Inspect the RDM Hydraulic pump and associated components for conditions that would cause low hydraulic pressure.
  Were any problems found?
  
  Yes
  - Repair the condition that caused the low RDM hydraulic pressure as necessary.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - Go To 6
REPLACE THE RDM HYDRAULIC PUMP MOTOR AND CHECK FOR THE DTC TO RETURN
1. Replace the RDM Hydraulic Pump Motor in accordance with the Service Information. Refer to MOTOR, PUMP, REMOVAL .
2. Connect the RDM Hydraulic Pump Motor and DTCM harness connectors.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the recorded Environmental Data and the When Monitored conditions, operate the vehicle in the conditions that set the DTC.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 7
  No
  - The new RDM Hydraulic Pump Motor repaired the problem.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
REPLACE THE RDM AND CHECK FOR THE DTC TO RETURN
1. Replace the RDM in accordance with the Service Information. Refer to REMOVAL .
2. With the scan tool, erase DTCs.
3. Test drive the vehicle under the conditions that originally set the DTC or use the When Monitored condition above.
4. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 8
  No
  - The new RDM repaired the problem.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all DTCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. 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.
5. Reconnect all DTCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read DTCM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the DTCM in accordance with the Service information. Refer to MODULE, DRIVETRAIN CONTROL (DTCM), REMOVAL .
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the DTCM VERIFICATION TEST. Refer to DTCM VERIFICATION TEST .