Diagnostic Test

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE ACTIVE AIR DAM FOR PROPER OPERATION
1. Turn the ignition off.
2. Visually inspect the Active Air Dam Assembly for the following items:
  - Dirt, ice or obstructions that could cause the Active Air Dam Assembly to bind causing linkage or Dams to become disconnected
  - Damaged or disconnected Active Air Dam Actuator linkages
  - Damaged Active Air Dam Assembly frame or Dams
  - Loose or missing Active Air Dam Actuator mounting bolts/retainers
  Were any problems found?
  
  Yes
  - Repair as the Active Air Dam as necessary. With the scan tool perform the Active Air Dam test to validate repair(s).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Active Air Dam Actuator in accordance with the Service Information. Refer to AIR DAM, FRONT, REMOVAL AND INSTALLATION . With the scan tool, perform the Active Air Dam Replaced procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .