Diagnostic Procedures

Check All Other Passive Anti-Theft System (PATS) DTCs - Repair all other PATS DTCs before DTC P1260. Refer to SELF-DIAGNOSTIC SYSTEM in appropriate IMMOBILIZER SYSTEM - PASSIVE ANTI-THEFT SYSTEM - TRIBUTE article in ACCESSORIES & EQUIPMENT. After all other PATS DTCs have been diagnosed, go to next step.
Check For Other Powertrain DTCs - Repair all other powertrain DTCs before P1260. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . After all other powertrain DTCs have been diagnosed, go to next step.

NOTE: PATS cannot stall engine after one second of operation.

Attempt To Start Engine - Complete Keep Alive Random Access Memory (KAM). Reset to clear DTC 1260. This reset initializes PCM to communicate with PATS. Attempt to start engine. If engine starts, problem is intermittent. For intermittent Stalls while driving, verify scan tool to PCM communication during concern. If PCM communication error occurs, possible causes are:
- Loss of PWRS or GNDS to PCM.
- Faulty PCM PWR relay.
- Faulty EEC PWR diode.
Repair as necessary and return vehicle to customer. If engine does not start, DTC P1260 is not cause of No Start. See TROUBLE SHOOTING - NO CODES article and BASIC DIAGNOSTIC PROCEDURES article.