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Home >> Chevrolet >> 1996 >> Astro Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0101 - MAF Sensor System Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Turn ignition on, engine off. Using scan tool, read and record FAIL RECORD data. Operate vehicle within conditions noted in FAIL RECORD data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0101, go to next step. If DTC P0101 is not displayed, see DIAGNOSTIC AIDS.
  3. Check for throttle body inlet screen blockage. Check for vacuum leaks at intake manifold, throttle body or EGR valve flange and pipes. Check for crankcase valve faulty, missing or incorrectly installed. Repair faulty conditions as necessary and go to step 17). If no faulty conditions exist, go to next step.
  4. Turn ignition on, throttle closed. Using scan tool, read TP ANGLE value. If scan tool displays about zero percent, go to next step. If scan tool does not display zero percent, go to DTC P0121.
  5. Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on, engine off. Using a DVOM, check voltage between MAF sensor harness connector signal circuit and chassis ground. If voltage is about 5 volts, go next step. If voltage is not as specified, go to step 7).
  6. Connect a test light between MAF sensor harness connector ignition feed and ground circuits. If test light illuminates, go to step 10). If test light does not illuminate, go to step 9).
  7. If voltage is less than 4.5 volts, go to step 11). If voltage is 4.5 volts or more, go to next step.
  8. Turn ignition off. Disconnect VCM connectors. Turn ignition on, engine off. Check voltage between VCM harness connector MAF signal circuit and chassis ground. If voltage reading is about zero volts, go to step 16). If voltage is not as specified, go to step 14),
  9. Connect test light between MAF sensor harness connector ignition feed circuit and chassis ground. If test light illuminates, go to step 12). If test light does not illuminate, go to step 13).
  10. Check for faulty connection at MAF sensor. Repair connection as necessary and go to step 17). If connection is okay, go to step 15).
  11. Check MAF sensor signal circuit between VCM and MAF sensor for open or short to ground. Repair signal circuit as necessary and go to step 17). If signal circuit is okay, go to step 16).
  12. Locate and repair open in the MAF sensor ground circuit and go to step 17).
  13. Locate and repair open MAF sensor ignition feed circuit and go to step 17).
  14. Locate and repair short to voltage in MAF sensor signal circuit and go to step 17).
  15. Replace MAF sensor and go to step 17).
  16. Replace VCM. Program replacement VCM using required equipment. After replacement, go to next step.
  17. 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 DTC P0101. Operate vehicle within conditions required to set DTC. If scan tool displays RAN AND PASSED, go to next step. If scan tool does not display RAN AND PASSED, return to step 2).
  18. Using scan tool, read and record REVIEW INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTCs. If no DTCs are displayed, system is okay.
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