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Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> Diagnostic Tests >> DTC P1275: Accelerator Pedal Position Circuit (Sensor 1) >> Diagnostic Procedures

Diagnostic Procedures

  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 ignition on, with engine off. With scan tool observe the APP sensor 1 voltage with the accelerator pedal in the rest position. Does scan tool indicate voltage less than 0.13 volt or greater than 4.87 volts? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC or as close to the Freeze Frame/Failure Records data that you observed. See CONDITIONS FOR RUNNING DTC . Does the DTC fail this ignition cycle? If yes, go to next step. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.2L BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article.
  4. Turn ignition off. Disconnect the accelerator pedal harness connector. Turn ignition on, with engine off. With scan tool, observe the APP sensor 1 voltage parameter. Does scan tool indicate voltage at zero volts? If yes, go to next step. If no, go to step  10.
  5. 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 scan tool, observe the APP sensor 1 voltage parameter. Does scan tool indicate the APP sensor 1 voltage at 5 volts? If yes, go to next step. If no, go to step  7.
  6. With a test light connected to battery voltage, probe the APP sensor low reference circuit. Does the test light illuminate? If yes, go to step  16. If no, go to step  12.
  7. With a DVOM, measure the voltage of the APP sensor 1 5-volt reference circuit. Does the DVOM indicate voltage at 5 volts? If yes, go to step  9. If no, go to next step.
  8. Does the DVOM indicate voltage less than 5 volts on the APP sensor 1 5-volt reference circuit? If yes, go to step  13. If no, go to step  15.
  9. 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  20. If no, go to step  11.
  10. Test the APP sensor 1 signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  20. If no, go to step  18.
  11. Test the APP sensor 1 signal circuit for a short to ground. Did you find and correct the condition? If yes, go to step  20. If no, go to step  18.
  12. 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  20. If no, go to step  18.
  13. 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  20. If no, go to next step.
  14. 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  20. If no, go to step  18.
  15. Test the APP sensor 1 5-volt reference circuit for a short to voltage. Repair as necessary. After repairs, go to step  20.
  16. Inspect for poor connections at the accelerator pedal harness connector. Did you find and correct the condition? If yes, go to step  20. If no, go to next step.
  17. Replace accelerator pedal assembly. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. After repairs, go to step  20.
  18. Inspect for poor connections at the PCM harness connector. Did you find and correct the condition? If yes, go to step  20. If no, go to next step.
  19. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  20. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  21. Observe the stored information, Capture Info with scan tool. Does 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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