Airflow meter - testing

Fuel and exhaust systems - Digifant fuel injection / Airflow meter - testing

1 Disconnect the wiring plug from the airflow meter (see illustration).

9.1 Airflow meter components

1 Air cleaner element 2 Cover
3 Bolt
4 Seal
5 Airflow meter
6 Connector
7 Tamperproof plug
8 Mixture (CO content) adjustment screw 9 O-ring
10 Clip
11 Air inlet hose
12 Plate
13 Seal
14 Retaining ring
15 Air cleaner body
16 Rubber washer
17 Temperature regulator 18 Warm air hose

2 Connect an ohmmeter between terminals 1 and 4 and check that the resistance of the inlet air temperature sender is as shown (see illustration) according to the ambient air temperature.

9.2 Inlet air temperature sender resistance graph

3 Connect the ohmmeter between terminals 3 and 4 and check that the resistance of the potentiometer is between 0.5 and 1.0 K ohms.

4 Connect the ohmmeter between terminals 2 and 3 and check that the resistance fluctuates as the airflow meter plate is moved.