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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 4.2L)DIAGNOSTIC TESTSDTC P1275: ACCELERATOR PEDAL POSITION CIRCUIT - SENSOR 1DIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada RWD

Diagnostic Procedures

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ON the ignition, with the engine OFF. With a scan tool observe the APP sensor 1 voltage with the accelerator pedal in the rest position. Does the scan tool indicate voltage less than 0.13 V or greater than 4.87 V? If yes, go to step  5 . If no, go to next step.
  3. Is DTC P1271 also set? If yes, see DTC P1271: EXCESSIVE DIFFERENCE BETWEEN ACCELERATOR PEDAL POSITION SENSORS  . If no, go to next step.
  4. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  5. Turn OFF the ignition. Disconnect the accelerator pedal harness connector. Turn ON the ignition, with the engine OFF. With a scan tool, observe the APP sensor 1 voltage parameter. Does the scan tool indicate voltage at 0 V? If yes, go to next step. If no, go to step  11 .
  6. Connect a fused jumper wire between the APP sensor 1 5-volt reference circuit and the APP sensor 1 signal circuit at the accelerator pedal harness connector. With a scan tool, observe the APP sensor 1 voltage parameter. Does the scan tool indicate the APP sensor 1 voltage at 5 V? If yes, go to next step. If no, go to step  8 .
  7. With a test lamp connected to battery voltage, probe the APP sensor low reference circuit. Does the test lamp illuminate? If yes, go to step  17 . If no, go to step  13 .
  8. With a Digital Multimeter (DMM), measure the voltage of the APP sensor 1 5-volt reference circuit. Does the DMM indicate voltage at 5 V? If yes, go to step  10 . If no, go to next step.
  9. Does the DMM indicate voltage less than 5 V on the APP sensor 1 5-volt reference circuit? If yes, go to step  14 . If no, go to step  16 .
  10. Test the APP sensor 1 signal circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  12 .
  11. Test the APP sensor 1 signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  19 .
  12. Test the APP sensor 1 signal circuit for a short to ground. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  19 .
  13. Test the APP sensor 1 low reference circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  19 .
  14. Test the APP sensor 1 5-volt reference circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  21 . If no, go to next step.
  15. Test the APP sensor 1 5-volt reference circuit for a short to ground. Did you find and correct the condition? If yes, go to step  21 . If no, go to step  19 .
  16. Test the APP sensor 1 5-volt reference circuit for a short to voltage. Repair as necessary. After repairs, go to step  21 .
  17. Inspect for poor connections at the accelerator pedal harness connector. Did you find and correct the condition? If yes, go to step  21 . If no, go to next step.
  18. Replace the accelerator pedal assembly. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  21 .
  19. Inspect for poor connections at the PCM harness connector. Did you find and correct the condition? If yes, go to step  21 . If no, go to next step.
  20. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  21. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2 .
  22. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.