LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1998 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0102 - MAF Sensor Circuit Low Frequency >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Start engine. Using scan tool, check MAF sensor reading. If reading is not greater than 1.3 gm/s, go to next step. If reading is greater than 1.3 gm/s, 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 not 10 volts or greater, go to step 7). If voltage is 10 volts or greater, go to next step.
  5. Check voltage between MAF sensor harness connector ground and power circuits. If voltage is within 0.5 volt of voltage measured previously in step 4), go to step 9). If voltage is not within 0.5 volt of voltage measured in step 4), go to step 8).
  6. Store fluid life index as indicated on scan tool. Turn ignition off. Wait 30 seconds, then disconnect PCM harness connector C2. Using DVOM, check MAF sensor input circuit for open or short to ground. 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 and retest.
  8. Repair open or high resistance in MAF sensor ground circuit and retest.
  9. Check terminal contact at MAF sensor. Repair as necessary. If terminal contact is okay, go to next step.
  10. Replace MAF sensor and retest.
  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.
scientia non olet · About LEMON Manuals