Fuel Injector: Testing and Inspection

INJECTOR CHECK

Measurement of Resistance between Terminals

1. Disconnect the injector connector.





2. Measure resistance between terminals.
Standard value: 10.5 - 13.5ohms [at 20°C (68°F)]
If not within specification, replace the injector.
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.
1. If the injector you are checking is not operating, you may hear the operating sound of the other injectors.
2. 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 (ECM) [M/T] or powertrain control module (PCM) [A/T] is suspected.