Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read the DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2
  No
  - The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded or contaminated terminals.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
1. With the scan tool, read all active DTCs from all CAN C Bus modules.
  NOTE:
  Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
  
  Does the scan tool display any active DTCs related to the conditions listed above?
  
  Yes
  - Diagnose and repair the DTC(s). Refer to the applicable article.
  No
  - Go To 3
CHECK IF PCM DTCs ARE PRESENT
1. With the scan tool, read PCM DTCs.
  Are any DTCs present?
  
  Yes
  - Diagnose and repair the DTC(s). For 2.4L, refer to 2.4L - DIAGNOSTIC CODE INDEX . For 3.2L, refer to 3.2L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 4
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
1. With the scan tool, select Network View and select Advanced.
  Is there more than one module with active DTCs "Logged Against" the PCM?
  
  Yes
  - Replace/update the PCM in accordance with the service information.
  - Perform PCM VERIFICATION TEST Refer to POWERTRAIN VERIFICATION TEST, 2.4L or POWERTRAIN VERIFICATION TEST, 3.2L . .
  No
  - Using the schematics as a guide, check the Automatic Headlamp Leveling Module (AHLM) pins, terminals, and connectors for corrosion, damage, and terminal push out. Pay particular attention to all Communication circuits. If no problems are found, replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to MODULE, HEADLAMP LEVELING (HLM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .