Fuel Injector On-Vehicle Inspection

Using sound scope (1) or such, check operating sound of injector when engine is running or cranking. Cycle of operating sound should vary according to engine speed.
If no sound or an unusual sound is heard, check injector circuit (wire or coupler) or injector.

Fig 1: Checking Injector Operating Sound
Courtesy of SUZUKI OF AMERICA CORP.
Disconnect connector from injector, connect ohmmeter between terminals of injector and check resistance.
If resistance is out of specification, replace.

Fuel injector resistance

14.2 - 14.8 Q (at 20 °C, 68 °)

Fig 2: Checking Resistance Between Terminals Of Injector
Courtesy of SUZUKI OF AMERICA CORP.
Connect connector to injector securely. Fuel Injector Removal and Installation