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 GRILL SHUTTER OPERATION
1. Turn the ignition off.
2. Visually inspect the Active Grill Shutter Assembly for the items listed but not limited to the following:
3. - Dirt, ice or obstructions that could cause the Active Grill Shutter Assembly to bind causing linkage or shutters to become disconnected
  - Damaged or disconnected Active Grill Shutter Actuator linkages
  - Damaged Active Grill Shutter Assembly frame or shutters
  - Loose or missing Active Grill Shutter Actuator mounting bolts/retainers
  Were any problems found?
  
  Yes
  - Repair as necessary. With the scan tool perform the Active Grill Shutter test to validate repair(s).
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Active Grill Shutter Actuator in accordance with the Service Information. With the scan tool, perform the Active Grille Shutter Replaced procedure.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .