On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

QD: Diagnostic Trouble Code (DTC) P1260

QD1 CHECK FOR PATS DTCs

Repair all Passive Anti-Theft (PATS) DTCs before P1260. (Refer to Workshop Manual, Anti-Theft Section for System Description and Operation).

Have all PATS DTCs been diagnosed?

Yes	No
GO to QD2 .	GO to Workshop Manual, Anti-Theft Section for DTC diagnosis.

QD2 CHECK FOR OTHER POWERTRAIN DTCs

Repair all Powertrain DTCs other than P1260.

Have all other Powertrain DTCs been diagnosed?

Yes	No
GO to QD3	GO to Section 4 , Powertrain Diagnostic Trouble Code (DTC) Charts for Pinpoint Test direction and REPAIR other DTCs.

QD3 ATTEMPT TO START ENGINE

Complete Keep Alive Memory Reset to clear DTC P1260. Refer to Section 2 , Powertrain Control Module (PCM) Reset for detailed instructions.
Attempt to start the engine.

Will the engine start?

Yes	No
No system faults exist at present time. For intermittent No Starts or Start Stalls, check for intermittent PATS faults. (PATS cannot stall the engine after 1 second of operation.) For intermittent Stalls while driving, verifiy 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.	DTC P1260 is not the cause of the No Start. GO to Section 3 , Symptom Charts to diagnose the No Start symptom.

Yes

No system faults exist at present time. For intermittent No Starts or Start Stalls, check for intermittent PATS faults. (PATS cannot stall the engine after 1 second of operation.) For intermittent Stalls while driving, verifiy 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.

DTC P1260 is not the cause of the No Start. GO to Section 3 , Symptom Charts to diagnose the No Start symptom.