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Home >> Cadillac >> 2003 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1106: Map System Performance >> Diagnostic Procedure
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Diagnostic Procedure

  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. Start the engine. Monitor the Diagnostic Trouble Code (DTC) information with the scan tool. Is DTC P0108 or P1635 also set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  3. Observe the MAP SENSOR parameter with the scan tool. Attempt to induce the fault that set the DTC by manipulating the MAP sensor wiring harness, the MAP sensor electrical connector, and the PCM connector. Is the MAP sensor voltage affected during any part of the test? If yes, go to next step. If no, go to step  8.
  4. Test the MAP sensor low reference circuit between the PCM and the MAP sensor for an intermittent open or for high resistance. Did you find and correct the condition? If yes, go to next step. If no, go to step  8.
    5. NOTE: Disconnecting the PCM may eliminate the short during testing.
  5. Test the MAP sensor signal circuit between the PCM and the MAP sensor for an intermittent short to voltage. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  6. Test for an intermittent and/or poor connections at the MAP sensor. Did you find and correct the condition? If yes, go to step  8. If no, go to next step.
  7. Test for an intermittent and/or poor connections at the PCM. Did you complete the action? If yes, go to next step.
  8. Clear the DTCs with a scan tool. Turn off the ignition for 30 seconds. Start the engine and operate vehicle within the Conditions For Running DTC. You may also operate vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  9. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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