Fuel Injector: Testing and Inspection

Measurement of Resistance Between Terminals
1. Remove the injector connector.
2. Measure the resistance between terminals.

Standard value: 13-16 Ohms [at 68°C (20°F)]

3. Install the injector connector.




Checking Operation Sound
Using a stethoscope or long blade screwdriver, check the operation sound ("chi-chi-chi") of injectors during idling or during cranking Check that as the engine speed increases, the frequency of the operating sound also increases.

CAUTION: Note that even if the injector you are checking is not operating, you will hear the operating sound of the other injectors.

NOTE: If no operating sound is heard from the injector that is being checked, check the injector drive circuit. If there is nothing wrong with the circuit, a defective injector or engine control module is suspected