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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 111 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0105: MAP/TP SENSOR PERFORMANCEDIAGNOSTIC PROCEDURES
2004 Oldsmobile Bravada RWD

Diagnostic Procedures

2004 Oldsmobile Bravada RWDSECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Sunfire, 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Install scan tool. Turn ignition on, with engine off. Observe the TP sensor voltage on the scan tool. Does the scan tool display a TP voltage less than 0.9 volt when throttle is fully closed? If yes, go to next step. If no, go to step  4.
  3. Select TP angle parameter on scan tool. Monitor scan tool while slowly depressing accelerator pedal to the floor, then slowly release pedal. Repeat the procedure several times. Does the TP angle value increase steadily when accelerator pedal is depressed to more than 98 percent value and decrease steadily, returning to less than 1 percent value when pedal is released? If yes, go to step  5. If no, go to step  17.
  4. Check throttle body for binding linkage or damaged linkage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  17.
  5. Observe Manifold Absolute Pressure (MAP) sensor pressure with a scan tool. Compare this value to a value observed from a known-good vehicle. Is the difference between the MAP values less than 3 kPa? If yes, go to next step. If no, go to step  9.
  6. Start engine while watching the MAP sensor value with scan tool. Does MAP sensor value change while starting the engine? If yes, go to next step. If no, go to step  8.
  7. With engine running, snap throttle while watching MAP sensor display on scan tool. Does MAP sensor value change rapidly when throttle position changes? If yes, go to DIAGNOSTIC AIDS . If no, go to next step.
  8. Turn ignition off. Remove MAP sensor from vacuum source. Inspect port for vacuum restrictions or vacuum leaks. Did you find and correct the condition? If yes, go to step  34. If no, go to next step.
  9. Turn ignition off. Disconnect MAP sensor electrical connector. Turn ON ignition. Observe MAP sensor voltage on scan tool. Does scan tool indicate that voltage is about 0 volts? If yes, go to next step. If no, go to step  12.
  10. Connect a test light to a good ground. Probe the 5-volt reference circuit of MAP sensor with test light. Does test light illuminate? If yes, go to next step. If no, go to step  14.
  11. Connect a 3-amp fused jumper to MAP sensor 5-volt reference circuit. Connect the other end of 3-amp fused jumper to MAP sensor signal circuit. Does scan tool indicate that voltage is about 5 volts? If yes, go to step  13. If no, go to step  15.
  12. Test MAP sensor signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  13. Connect a test light to B+. Probe MAP sensor low reference circuit with test light. Does test light illuminate? If yes, go to step  28. If no, go to step  16.
  14. Test the 5-volt reference circuit of MAP sensor for high resistance or an open. Did you find and correct condition? If yes, go to step  34. If no, go to step  30.
  15. Test the signal circuit of MAP sensor for high resistance or an open. Did you find and correct the condition? If yes, go to step  344. If no, go to step  30.
  16. Test MAP sensor low reference circuit for high resistance or an open. Did you find and correct the condition? If yes, go to step  344. If no, go to step  30.
  17. Turn ignition off. Disconnect TP sensor electrical connector. Turn ignition on. Observe the TP sensor voltage on the scan tool. Does the scan tool indicate that the voltage is about 0 volts? If yes, go to next step. If no, go to step  21.
  18. Connect a test light to a good ground. Probe the 5-volt reference circuit of the TP sensor with the test light. Does the test light illuminate? If yes, go to next step. If no, go to step  23.
  19. Measure the voltage from the TP sensor 5-volt reference circuit to a good ground. Does the voltage measure more than 5.2 volts? If yes, go to step  24. If no, go to next step.
  20. Connect a 3-amp fused jumper to the TP sensor 5-volt reference circuit. Connect the other end of the 3-amp fused jumper to the TP sensor signal circuit. Does the scan tool indicate that the voltage is about 5 volts? If yes, go to step  22. If no, go to step  25.
  21. Test the TP sensor signal circuit for a short to voltage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  22. Connect a test light to B+. Probe the TP sensor low reference circuit at the TP sensor electrical connector with the test light. Does the test light illuminate? If yes, go to step  29. If no, go to step  26.
  23. Test the 5-volt reference circuit of the TP sensor for high resistance or an open. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  24. Test the 5-volt reference circuit of the TP sensor for a short to voltage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  27.
  25. Test the TP sensor signal circuit for high resistance or an open. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  26. Test the TP sensor low reference circuit for high resistance or an open. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  27. Test the 5-volt reference circuit of the following sensors for a short to voltage: The A/C high side pressure sensor and FTP sensor. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  28. Inspect for poor connections at the MAP sensor. Did you find and correct the condition? If yes, go to step  34. If no, go to step  31.
  29. Inspect for poor connections at the TP sensor electrical connector. Did you find and correct the condition? If yes, go to step  34. If no, go to step  32.
  30. Inspect for poor connections at the PCM. Did you find and correct the condition? If yes, go to step  34. If no, go to step  33.
  31. Replace MAP sensor. After replacing sensor, go to step  34.
  32. Replace TP sensor. After replacing sensor, go to step  34.
  33. Turn ignition off. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to step  35.
  34. Use the scan tool in order to perform the Fuel Trim Reset procedure. When complete, go to next step.
  35. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR SETTING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  36. Using scan tool, observe stored information. Does scan tool any DTCs that have not been 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.