Fuel Injector: Testing and Inspection

Injector Resistance Check:

Measurement of resistance between Terminals
1. Remove the injector connector.
2. Measure the resistance between terminals.
- Standard value: 11-15 ohms [at 2O°C (68°F)]
3. Install the injector connector






Checking Operation Sound
Using a stethoscope or long blade screwdriver, check the operation sound ('tick-tick-tick") of injectors during idling or during cranking

Check that as the engine speed increases, the frequency of the operating sound also increases.

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 PCM is suspected