Airflow Meter (AFM)
Inspect airflow meter body for cracks or damage. Using an ohmmeter, check resistance between sensor terminals. See AIRFLOW METER SPECIFICATIONS table. Pry open measuring plate with a screwdriver and measure resistance between terminals "E1" and "Fc" (fuel pump switch), and between terminals "E2" and "Vs". See Fig 1 . If readings are incorrect replace AFM assembly.
AIRFLOW METER SPECIFICATIONS
| Terminal | Resistance (Ohms) | |
|---|---|---|
| E2-Vs | 20-400 | |
| E2-Vc | 100-300 | |
| E2-Vb | 200-400 | |
| E2-THA (At Temperature Indicated) | ||
| -4°F (-20°C) | 10,000-20,000 | |
| 0°F (0°C) | 4000-7000 | |
| 68°F (20°C) | 900-1300 | |
| 140°F (60°C) | 400-700 | |
| E1-Fc | Infinity | |
| E1-FC Measuring Plate Fully Closed | Infinity | |
| E1-FC Measuring Plate Fully Open | 0 | |
| E2-VS Measuring Plate Fully Closed | 20-400 | |
| E2-VS Measuring Plate Fully Open | 20-1000 | |