Fuel Delivery and Air Induction: Testing and Inspection

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.






CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.






ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (25) (ECCS ground).






Electrical Diagrams






Circuit Connectors

1 Of 2:

2 Of 2:

DIAGNOSTIC PROCEDURE



COMPONENT INSPECTION
Injector






1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.

Resistance: 10 - 14 ohms at 25° C (77° F)

If NG, replace injector.