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Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P0106: Manifold Absolute Pressure (Map) Sensor Circuit Performance >> Diagnostic Aids

Diagnostic Aids

An intermittent problem can be caused by misrouted harness, rubbed-through wire insulation or broken wire inside insulation. Also, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

  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:
    • MAP sensor seal missing or damaged.
    • 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 (Blue wire on VehiCROSS, or Gray wire on 3.2L, or Red wire on all others) 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 voltage reference circuit (Black/Yellow wire on VehiCROSS, or Green/White wire on all others) and signal circuit (Blue wire on VehiCROSS, Gray wire on 3.2L, or Red wire on all others) 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 (Black/Blue wire on VehiCROSS, or Green wire on all others) 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 voltage reference circuit (Black/Yellow wire on VehiCROSS, or Green/White wire on all others) 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 (Blue wire on VehiCROSS, Gray wire on 3.2L, or Red wire on all others) for high resistance, open or poor connection. Repair as necessary. Retest system. If wire is okay, go to next step.
  10. Check MAP sensor signal circuit (Blue wire on VehiCROSS, Gray wire on 3.2L, or Red wire on all others) for poor connection at PCM. Repair as necessary. If wire is okay, replace PCM. 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 (Blue wire on VehiCROSS, Gray wire on 3.2L, or Red wire on all others) for a short to battery voltage or voltage reference circuit. Repair as necessary. If wire is okay, replace PCM. Retest system.
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