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Home >> Isuzu >> 2000 >> Trooper S, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.2L & 3.5L >> Diagnostic Trouble Code Identification >> DTC P0106: Manifold Absolute Pressure (Map) Sensor Circuit Performance >> Diagnostic Procedure
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Diagnostic Procedure

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. Go to next step.
  2. Turn ignition on. Review and record FAILURE RECORDS data on scan tool. Operate vehicle within FAILURE RECORDS conditions. If DTC P0106 is set, go to step  4. If DTC P0106 is not set, go to next step.
  3. Check for the following conditions:
    • Vacuum hoses disconnected, damaged or misrouted.
    • Intake manifold leaks.
    • Vacuum leaks at throttle body or EGR valve and/or piping.
    • PCV valve improperly installed, damaged or missing.

    Repair as necessary. Retest system. If no problems are found, check for an intermittent problem. See DIAGNOSTIC AIDS .

  4. Turn ignition off. Disconnect MAP sensor harness connector. Turn ignition on. Observe MAP sensor parameter on scan tool. If display is about 11 kPa, go to next step. If display is not as specified, go to step  12.
  5. Connect a test light between battery positive terminal and sensor signal circuit at MAP sensor harness connector. If display on scan tool is about 105 kPa, go to next step. If display is not as specified, go to step  9.
  6. Using a fused jumper wire, connect 5-volt reference circuit and signal circuit together at MAP sensor harness connector. If display on scan tool is about 104 kPa, go to next step. If display is not as specified, go to step  8.
  7. Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor ground circuit for high resistance, open or poor connection. Repair as necessary. Retest system. If wire is okay, go to step  11.
  8. Turn ignition off. Check MAP sensor 5-volt reference circuit for high resistance, open or poor connection. Repair as necessary. Retest system. If wire is okay, go to step  10.
  9. Turn ignition off. Disconnect PCM harness connectors. Check MAP sensor signal circuit for high resistance, open or short circuit. Repair as necessary. Retest system. If wire is okay, go to next step.
  10. Check MAP sensor signal circuit for poor connection at PCM. Repair as necessary. If wire is okay, replace and reprogram PCM. See PROGRAMMING . Retest system.
  11. Check for poor connection at MAP sensor. Repair as necessary. If connection is okay, replace MAP sensor. Retest system.
  12. Turn ignition off. Disconnect PCM harness connectors. Turn ignition on. Using a voltmeter, check MAP sensor signal circuit for a short to battery voltage or 5-volt reference circuit. Repair as necessary. If wire is okay, replace and reprogram PCM. See PROGRAMMING . Retest system.
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