1. INSPECT INJECTOR OPERATION
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.
2. INSPECT INJECTOR RESISTANCE
(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.
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)
Was this article helpful?