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Home >> Chevrolet >> 1998 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0106 - Map Sensor System Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition on, engine off. Using scan tool, read MAP sensor voltage. If MAP voltage is plus or minus 0.4 volt of typical scan tool data, go to next step. If MAP voltage is not plus or minus 0.4 volt of typical scan tool data, go to step 6).
  3. Disconnect and plug MAP sensor vacuum source. Connect a hand-held vacuum pump to MAP sensor. Start engine. Using scan tool, read and record MAP sensor voltage. Observe and record MAP sensor voltage while applying 10 in. Hg to sensor. If difference between first and second reading is greater than 1.5 volts, see DIAGNOSTIC AIDS. If difference is not greater than 1.5 volts, go to next step.
  4. Check for faulty connection at MAF sensor. If connection is faulty, go to next step. If connection is okay, go to step 6).
  5. Repair connection as necessary. After repairs, go to step 7).
  6. Replace MAP sensor. After replacing sensor, go to next step.
  7. Using scan tool, select DTC, CLEAR INFO function. Start engine and allow it to reach operating temperature. Using scan tool, select DTC, SPECIFIC function and enter this DTC. Operate vehicle within conditions required to set DTC. If scan tool indicates that this DTC RAN AND PASSED, go to next step. If scan tool does not indicate that this DTC RAN AND PASSED, repeat step 2).
  8. Using scan tool, select Read and Record INFO in REVIEW INFO function. If additional DTCs are present, diagnose affected DTCs. If no additional DTCs are present, system is okay.
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