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.
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

AIRFLOW METER VOLTAGE SPECIFICATIONS

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.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Airflow Meter (AFM)