Airflow Meter
- Intake air temperature sensor and fuel pump switch are contained in the airflow meter. Determine terminal identification. See Fig 1 .
- Using ohmmeter, measure resistance between designated terminals. See AIRFLOW METER RESISTANCE SPECIFICATIONS
table. Reading must be within specification.AIRFLOW METER RESISTANCE SPECIFICATIONS
Terminals Ohms Temperature E2 & Vs Non-Turbo 50-500 N/A Turbo 200-600 N/A E2 & Vref Non-Turbo 200-500 N/A Turbo 200-400 N/A E2 & THAa (1) 10,000-20,000 -4°F (-20°C) E2 & THAa (1) 4000-7000 32°F (0°C) E2 & THAa (1) 2000-3000 68°F (20°C) E2 & THAa (1) 900-1300 104°F (40°C) E2 & THAa (1) 400-700 140°F (60°C) E1 & Fc Infinity N/A (1) Intake air temperature sensor. - Ensure measuring plate moves freely in airflow meter. Remaining terminals must be checked for fuel pump switch and measuring plate resistances. See Fig 1 . Attach ohmmeter to specified terminals to check fuel pump switch and measuring plate resistance. Refer to the FUEL PUMP SWITCH & PLATE RESISTANCE SPECIFICATIONS table.
FUEL PUMP SWITCH & PLATE RESISTANCE SPECIFICATIONS
| Terminals | Ohms | Plate Position | |
|---|---|---|---|
| E1 & Fc | Infinity | Fully Closed | |
| E1 & Fc | 0 | Fully Open | |
| E2 & Vs | |||
| Non-Turbo | 50-500 | Fully Closed | |
| Turbo | 200-600 | Fully Closed | |
| E2 & Vs | |||
| Non-Turbo | 50-500 | Fully Open | |
| Turbo | 20-1000 | Fully Open | |