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Home >> Pontiac >> 2002 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P0106: Map System Performance >> Diagnostic Procedures
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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 ON the ignition, with the engine OFF. Observe the throttle angle parameter with a scan tool. Move the throttle slowly from closed to wide open position. Does the throttle angle move steadily and completely from 0% to above 98%? If yes, go to next step. If no, see DTC P0121: TP SENSOR PERFORMANCE .
  3. Observe the MAP sensor pressure with a scan tool. Compare this value to value observed in a known-good vehicle. Is the difference between the vehicles less than 3 kPa? If yes, go to next step. If no, go to step  8.
  4. Observe the MAP sensor pressure on the scan tool. Start the engine. Does the MAP sensor change value? If yes, go to next step. If no, go to step  8.
  5. Turn OFF the ignition. Remove the MAP sensor from the vacuum source. Leave the electrical harness connected. Connect a hand vacuum pump to the MAP sensor port. Turn ON the ignition, with the engine OFF. Observe the MAP sensor pressure as you SLOWLY apply vacuum 1 in. Hg at a time. Each inch of vacuum should result in a 3-4 kPa drop in the MAP sensor pressure. Does the scan tool indicate that the MAP sensor is operating normally? If yes, go to next step. If no, go to step  16.
  6. Observe the MAP sensor pressure with 20 in. Hg applied to the MAP sensor. Does the scan tool indicate that the MAP sensor pressure is less than 34 kPa? If yes, go to next step. If no, go to step  8.
  7. Disconnect the MAP sensor from the hand vacuum pump. Does the MAP sensor pressure return to the original value that was observed in step  3? If yes, see DIAGNOSTIC AIDS . If no, go to step  16.
  8. Turn OFF the ignition. Disconnect the MAP sensor electrical connector. Turn ON the ignition, with the engine OFF. Does the scan tool indicate that the MAP sensor voltage is more than 0.1 V? If yes, go to step  15. If no, go to next step.
  9. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the MAP sensor and the signal circuit of the MAP sensor. Does the scan tool indicate that the MAP sensor voltage is near 5 V? If yes, go to next step. If no, go to step  14.
  10. Remove the jumper wire. Measure the voltage from the 5-volt reference circuit of the MAP sensor to a good ground. Does the voltage measure more than 5.2 V? If yes, go to step  12. If no, go to next step.
  11. Probe the low reference circuit with a test lamp connected to a battery positive voltage source. Does the test lamp illuminate? If yes, go to step  16. If no, go to step  13.
  12. Test the 5-volt reference circuit of the MAP sensor for a short to voltage. Did you find and correct the condition? If yes, go to step  20. If no, go to step  17.
  13. Test the low reference circuit of the MAP sensor for high resistance or an open. Did you find and correct the condition? If yes, go to step  20. If no, go to step  17.
  14. Test the 5-volt reference and the signal circuit of the MAP sensor for high resistance. Did you find and correct the condition? If yes, go to step  20. If no, go to step  17.
  15. Test the signal circuit of the MAP sensor for a short to voltage. Did you find and correct the condition? If yes, go to step  20. If no, go to step  17.
  16. Inspect the MAP sensor for poor connections. Did you find and correct the condition? If yes, go to step  20. If no, go to step  18.
  17. Inspect the PCM for poor connections. Did you find and correct the condition? If yes, go to step  20. If no, go to step  19.
  18. Replace the MAP sensor. After repairs, go to step  20.
  19. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  20. 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.
  21. 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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