Test QD: DTC P1260: Testing

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NOTE: For additional testing information, see DIAGNOSTIC AIDS .

1) Continuous Memory DTC P1260: Check For Passive Anti-Theft System DTCs
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 - EEC-V - GASOLINE & NGV 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.