Sensor Inspection

1. Disconnect the Volume Air Flow Sensor connectors.

MPI Relay Circuitry:

2. Connect an ohmmeter to terminals # 5 and # 6 of the sensor connector.

Temperature [°C (°F)] Resistance (k ohms)

0 (32) 6.0
20 (68) 2.7
80 (176) 0.4

Heating IAT Sensor:

3. While heating the temperature sensor with a hair dryer, measure the resistance.

Temperature [°C (°F)] Resistance (k ohms)

Higher Smaller

4. If resistance does not decrease as heat increases or the resistance remains unchanged, replace the volume air flow sensor assembly.