Using (SST)s Engine Signal Monitor

1. Check the mass air flow sensor for damage and cracks.




2. Connect the Special Service Tools (Engine Signal Monitor) to the PCM.
3. Measure the voltage at PCM terminal 3B.




4. Verify that the voltage is within the specification.
5. If not as specified, inspect the harness and connector between the mass air flow sensor and the PCM terminal.
6. If there is correct terminal voltage and harness continuity, replace the mass air flow sensor.