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Airflow Meter (AFM)

  1. Remove rubber boot from AFM connector. Turn ignition on. Using a voltmeter, check voltage between each terminal and ground. See the AIRFLOW METER VOLTAGE SPECIFICATIONS  table. If voltage is not within specifications, check main fuse, main relay, resistance in AFM, or wiring harnesses.
  2. Remove connector from AFM. Using an ohmmeter, check resistance between terminals. Refer to the AIRFLOW METER RESISTANCE SPECIFICATIONS  table. Press open measuring plate, and measure resistance between terminals "E2-Vs" and between terminals "E1-Fc". See Fig 1 . If readings are incorrect replace, AFM assembly.
Fig 1: Measuring Airflow Meter Resistance
G48204
AIRFLOW METER VOLTAGE SPECIFICATIONS

Terminal Voltage
Vs .7-2.7
Vc 6-10
Vb About 12
Fc About 12
AIRFLOW METER RESISTANCE SPECIFICATIONS

Terminal Resistance (Ohms)
E1-Fc (1) Infinity
E2-Vs (2) More than 20
E2-Vc 100-300
E-Vb 200-400
E2-THA At -4°F (-20°C) 13,600-18,400
E2-THA At 68°F (20°C) 2205-2695
E2-THA At 140°F (60°C) 493-667
(1) With measuring plate fully closed. Reading should be zero ohms (continuity) with plate fully open.
(2) With measuring plate fully closed. Reading must be lass than 400 ohms with measuring plate open.
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