Engine Cranks But Will Not Start

Anti-Theft - Passive

Engine cranks but will not start
If the Engine is cranking it means that the ECM has passed the authorization required with the Instrument Cluster. If this authorization failed, the ECM would not engage the starter relay. This could be confirmed by verifying the PATS LED prove out (illuminated solid for 3 seconds) or by reading DTCs from the instrument cluster and ECM.

In this case, the fuel pump circuit should be verified. The Fuel Pump Delivery Module (FPDM), which is supplied via the RJB (authentication required with the instrument cluster) and controlled by the ECM, supplies the fuel pump.

In all cases of suspected non-start issues, the most logical failure modes should be eliminated first. i.e.
- Check all relevant supplies and grounds to the relevant modules listed herein.
- Note any unusual behavior from other systems/functionality.
- Note any functions that are not operating as expected.