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HOMESERVICE MANUALSCADILLAC1996SEVILLE STSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODESDIAGNOSTIC TROUBLE CODESDTC P0102 - MAF SENSOR CIRCUIT LOW FREQUENCYDIAGNOSTIC PROCEDURES
1996 Cadillac Seville STS

Diagnostic Procedures

1996 Cadillac Seville STSSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Start engine. Using scan tool, check MAF sensor reading. If reading is 1.3 gm/sec or less, go to next step. If reading is greater than 1.3 gm/sec, fault is not present.
  3. Turn ignition off. Disconnect MAF sensor harness connector. Turn ignition on. Using DVOM, check voltage between ground and MAF sensor input circuit at PCM harness connector terminal. If voltage is 4-6 volts, go to next step. If voltage is not as specified, go to step 6).
  4. Check voltage between ground and MAF sensor power circuit at MAF sensor harness connector. If voltage is less than 10 volts, go to step 7). If voltage is 10 volts or greater, go to next step.
  5. Measure voltage between MAF sensor harness connector ground and power circuits. If voltage is within 0.5 volt of voltage measured in step 4), go to step 9). If not, go to step 8).
  6. Store fluid life index as indicated on scan tool. Turn ignition off and wait 30 seconds, then disconnect PCM harness connector C2. Using DVOM, check MAF sensor input circuit for open or short to ground. If repairs are necessary, repair as necessary and verify repair. If input circuit is okay, go to step 11).
  7. Repair open or short to ground in MAF sensor power feed circuit.
  8. Repair open or high resistance in MAF sensor ground circuit.
  9. Check terminal contact at MAF sensor. Repair as necessary. If terminal contact is okay, go to next step.
  10. Replace MAF sensor.
  11. Check terminal contact of MAF sensor input circuit at PCM harness connector. Repair as necessary. If terminal contact is okay, go to next step.
  12. Replace PCM. Program replacement PCM using required equipment.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.