Test QD: DTC P1260: Testing
- 1) For Continuous Memory Only DTC P1260: Check For Passive Anti-Theft System DTCs
This DTC indicates that the passive anti-theft system (PATS) has determined a theft condition existed and the engine is disabled. This DTC is a good indicator to check the PATS for DTCs. Possible causes are:- Previous theft condition.
- Anti-Theft System failure.
If any Passive Anti-Theft System (PATS) DTCs are present, service PATS DTCs as necessary before continuing. See appropriate ANTI-THEFT SYSTEMS article in ACCESSORIES & EQUIPMENT. If no PATS DTCs are present, go to next step.
- 2) Check For Other Powertrain DTCs
Repair all other PCM DTCs before diagnosing DTC P1260. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no other PCM DTCs are present, go to next step. - 3) Attempt To Start Engine
Perform KEEP ALIVE RANDOM ACCESS MEMORY RESET PROCEDURE under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM to clear DTCs. Attempt to start engine. If engine does not start, DTC P1260 is not the cause of no-start. Diagnose NO-START/NORMAL CRANK symptom. See SYMPTOMS in TROUBLE SHOOTING - NO CODES - CNG, FLEX-FUEL & GASOLINE article. If engine starts, no concern is indicated at this time. Testing is complete. For intermittent no-start, or starts and stalls concern, check for intermittent PATS faults. PATS will not cause engine to stall after one second of operation. 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
- Shorted VREF Signal
Repair as necessary. Return vehicle to customer.
NOTE:
For additional testing information, see DIAGNOSTIC AIDS .