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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L >> Diagnostic Trouble Code (DTC) Tests >> DTC 12: Mass Airflow (MAF) Sensor

DTC 12: Mass Airflow (MAF) Sensor

  1. Check Power Supply  - Turn ignition off. Disconnect MAF sensor harness connector. See Fig 1 . Turn ignition on. Measure voltage between MAF sensor harness connector terminal "b" (Orange/Blue wire) and ground. See Fig 2 . If battery voltage is present, go to next step. If battery voltage is not present, repair harness or connectors as necessary.
  2. Check Ground Circuit  - Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity between MAF sensor connector terminal "c" (White wire) and ECM terminal No. 17. See Figure and Fig 3 . If continuity is present, go to next step. If continuity is not present, repair harness or connectors as necessary.
  3. Check Input Signal Circuit  - Check continuity between MAF sensor connector terminal "d" (Orange wire) and ECM harness connector terminal No. 16. See Figure and Fig 4 . If continuity is not present, repair harness or connectors as necessary. If continuity is present, go to next step.
  4. Check MAF Sensor  - Inspect MAF sensor. See I - SYS/COMP TESTS article. Replace MAF sensor if necessary and perform FINAL CHECK  in this article. If MAF sensor is okay, check ECM wiring harness connector and repair or replace as necessary.
Fig 1: Locating MAF Sensor Harness Connector
G93C80921Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: DTC 12, Checking Power Supply
G93D80922Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: DTC 12, Checking Ground Circuit
G93E80923Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: DTC 12, Checking Input Signal Circuit
G93F80924Courtesy of NISSAN MOTOR CO., U.S.A.