Fuel Injector On-Vehicle Inspection

Using sound scope (1) or the like, check operating sound of injector (2) when engine is running or cranking.
Cycle of operating sound should vary according to engine speed.

If no sound or unusual sound is heard, check injector circuit (wire or connector) or injector.

Fig 1: Checking Operating Sound Of Injector Using Sound Scope
Courtesy of SUZUKI OF AMERICA CORP.
Disconnect connector (1) from injector, connect ohmmeter between terminals of injector and check resistance.
If resistance is out of reference value greatly, replace.

Reference resistance of fuel injector

11.6 - 12.4 Ω at 20 °C, 68 °F

Fig 2: Checking Resistance
Courtesy of SUZUKI OF AMERICA CORP.
Connect connector to injector securely.