Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

CHECK PCM FOR CHARGING SYSTEM DTC

Turn the ignition on.
With the scan tool, clear all DTC's.
Cycle the ignition switch from on to off.
Start the engine.
Run the engine at approximately 1500 RPM for 1 minute.
With the scan tool, read DTCs.
Are there any Charging System DTCs set in the PCM?

Yes
- Refer to the DTC INDEX article for Charging System diagnostic procedures.
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .