Air Flow Meter/Sensor: Testing and Inspection

INSPECTION
- Check the mass air flow sensor for damage and cracks.
- Connect the Special Service Tool's (SST)'s (Engine Signal Monitor) to the PCM.
- Measure the voltage at PCM terminal 3B.
- Verify that the voltage is within the specification.




- If not as specified, inspect the harness and connector between the mass air flow sensor and the PCM terminal.
- If there is correct terminal voltage and harness continuity. replace the mass air flow sensor.

USING THE NGS
- Check the mass air flow sensor for damage and cracks.
- Connect the SSTs New Generation Star (NGS) tester to the data link connector-2.




- Select the PID/DATA MONITOR AND RECORD function.
- Select "MAF V", on the NGS display. The NGS measures and shows the voltage.




- If not as specified, inspect the harness and connector between the mass air flow sensor and the PCM terminal.
- If there is correct terminal voltage and harness continuity, replace the mass air flow sensor.




NOTE: The scan tool shows the mass air flow rate and load value.