Air Flow Meter/Sensor: Testing and Inspection

Checking Intake Air Sensor

Air Filter And Intake Components:

Requirements:
- Ohmmeter and test leads

Intake Air Sensor Connection:

- Pull off electrical connector from intake air sensor

Checking Fuel Pump Contacts In Intake Air Sensor

- Connect ohmmeter to terminals 36 and 39
Resistance should be infinite ohms
- Push air sensor flap open fully
Resistance should be 0 ohms as soon as flap is opened slightly
Reading should remain constant through out flap range
- Release air sensor flap
Meter should read infinite ohms

Note: If resistance specifications are correct but fuel pump does not work, check for break in wiring between control unit and intake air sensor

Resistance Checks

- Touch ohmmeter probes to following pairs of air sensor connections (flap closed, room temperature)

6 & 9 = 200 - 400 ohms
6 & 8 = 130 - 260 ohms
8 & 9 = 70 - 140 ohms
6 & 7 = 40 - 300 ohms
7 & 8 = 100 - 500 ohms
6 & 27 if applicable max. 2,800 ohms at 20°C (68°F)

Checking Resistance Strip In Intake Air Sensor

- Check intake air sensor plate is in closed position
- Connect ohmmeter to terminals 7 & 8 and open air sensor plate slowly.
Resistance must change smooth and evenly
Resistance should not be lower than 40 ohm and not above 500 ohms of values
- Repeat on terminals 6 & 7