Fuel Injector On-Vehicle Inspection

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

In no sound or an unusual sound is heard, check injector circuit (Wire or coupler) or injector.

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

Resistance of fuel injector
1. 13-16 ohm at 20°C (68°F)
Fig 2: Checking Resistance Of Fuel Injector
Courtesy of SUZUKI OF AMERICA CORP.
Connect coupler to injector securely.