Fuel Injector: Testing and Inspection

WIRING DIAGRAM




COMPONENT DESCRIPTION
The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the injector circuit, the coil in the injector is energized. The energized coil pulls the needle valve back and allows fuel to flow through the injector into the intake manifold. The amount of fuel injected depends upon the injection pulse duration. Pulse duration is the length of time the injector remains open. The ECM controls the injection pulse duration based on engine fuel needs.

Terminals 102 Thru 109:

ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECM ground).




DIAGNOSTIC PROCEDURE




COMPONENT INSPECTION
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the image.
Resistance: 10 - 14 Ohm [at 25 °C (77 °F)]
If NG replace injector.