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Mass Airflow Sensor

Faults in mass airflow sensor circuit may set Code 12. To test system, see CODE 12 diagnostic procedures in appropriate G - TESTS W/ CODES article in the ENGINE PERFORMANCE section below.

  1. To test airflow sensor, warm engine to operating temperature. Pull rubber protector away from mass airflow sensor connector so terminals can be backprobed. At mass airflow sensor connector, measure voltage at Orange wire.
  2. If voltage is not as specified in MASS AIRFLOW SENSOR VOLTAGE TEST table, check for dust or foreign material in hot wire air passage of mass airflow sensor. If air passage is okay, replace mass airflow sensor.
MASS AIRFLOW SENSOR VOLTAGE TEST (1)

Application Volts With KOEO (2) Volts At Idle
1.6L Less Than 1.0 0.7-1.1
2.0L Less Than 1.0 1.3-1.7
(1) Values are approximate and vary with engine RPM.
(2) Key On, Engine Off.
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