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Home >> Chevrolet >> 1998 >> Cavalier RS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.2L >> Diagnostic Trouble Codes >> DTC P0106 - Map Sensor System Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition on, with engine off. Using scan tool, compare BARO reading with a known-good vehicle. If BARO reading is normal for the altitude, go to next step. If BARO reading is not normal for the altitude, go to step 7).
  3. Start engine while watching MAP sensor value. If MAP sensor value changes, go to next step. If MAP value does not change, go to step 5).
  4. With engine still running, snap throttle while watching MAP sensor display on scan tool. If MAP sensor value change rapidly with throttle position changes, go to step 8). If MAP value does not change rapidly, go to step 6).
  5. Disconnect MAP sensor vacuum hose. Install a hand-held vacuum pump to MAP sensor. Turn ignition on, with engine off. Apply 15 in. Hg to MAP sensor. Monitor MAP sensor value on scan tool. If MAP sensor value changes, go to next step. If MAP sensor value does not change, go to step 7).
  6. Remove MAP sensor vacuum hose from manifold port. Inspect manifold port and hose for restriction. Repair as necessary. After repairs, go to step 8). If no problems were found, go to next step.
  7. Replace MAP sensor. After replacing sensor, go to next step.
  8. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Drive vehicle at a steady speed. Select SPECIFIC DTC function then enter this DTC. If scan tool indicates that this DTC TEST RAN AND PASSED, go to next step. If scan tool does not indicate that this DTC TEST RAN AND PASSED, repeat step 2).
  9. Check for additional DTCs. Diagnose affected DTCs as necessary. If no other DTCs are set, system is okay. See DIAGNOSTIC AIDS.
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