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Home >> Cadillac >> 2000 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P0101: MAF System Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if any other DTCs are set. Diagnose affected DTC(s). If no other DTC(s) are set, go to next step.
  3. Check vacuum leaks at MAF sensor seal, throttle body, intake manifold, PCV, EGR system, plate or tubes and brake booster and hoses. Repair as necessary. After repairs, go to step  7. If no problem is found, go to next step.
  4. Check for stuck or incorrect PCV valve. Check for air (unmetered) leaks at oil dipstick tube or oil filler cap. Repair as necessary. After repairs, go to step  7. If no problem is found, go to next step.
  5. Using FREEZE FRAME and FAILURE RECORDS data function on scan tool, duplicate conditions under which this DTC was set. If DTC resets, go to next step. If DTC does not reset, see DIAGNOSTIC AIDS .
  6. Replace MAF sensor. After replacing sensor, go to next step.
  7. Using scan tool, review and record fail records data. Clear DTCs. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, system is okay. If scan tool does not indicate that this test ran and passed, repeat step  2.
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