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Home >> Buick >> 1989 >> Reatta >> Repair and Diagnosis >> Engine Performance >> System >> 3.3L/3.8L PFI Tests W/Codes >> Diagnostic Trouble Code Charts: 13-66 >> Code 34: Mass Airflow (MAF) Sensor >> Notes

Code 34: Mass Airflow (MAF) Sensor: Notes

Code 34 is set when engine is running with no MAF sensor signal for greater than 4 seconds.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. This step checks to see if ECM recognizes a problem.
  2. A voltage reading at sensor harness terminal "A" of less than 4 or greater than 6 volts indicates a fault in circuit No. 492 or poor connections.
  3. Verifies that both ignition voltage and a good ground are available.
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