Test QD: DTC P1260: Testing
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2003 Mercury Sable, 2003 Mercury Mountaineer, 2003 Mercury Marauder, 2003 Mercury Grand Marquis, and 2003 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
- 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 .