Onvehicle Inspection


Check operation sound from each injector.

(a) With the engine running or cranking, use a sound scope to check that there is normal operating noise in proportion to engine rpm.

(b) If you have no sound scope, you can check the injector transmission operation with a screwdriver.

If no sound or an unusual sound is heard, check the wiring connector, injector or injection signal from the ECU.


(a) Remove the throttle body.

(See steps 1 to 8, 10 and 11 on pages FI-135 and 136)

(b) Disconnect the injector connector.

(c) Using an ohmmeter, measure the resistance between the terminals.

Resistance: 2-4Q

If the resistance is not as specified, replace the injector.

(d) Reconnect the injector connector.

(e) Reinstall the throttle body.

(See steps 2, 3 and 5 to 12 on pages FI-138 and 139)

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Simple Car Care Tips and Advice

Simple Car Care Tips and Advice

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