Injector Circuit and Fuel Injector

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

Consult Reference Value In Data Monitor:

Specification data are reference values.


ECM Terminals and Reference Value

Terminal No. 4 - 113:

Specification data are reference values and are measured between each terminal and 32 (ECM ground).

Wiring Diagram

Main Harness, Engine Room, And Body Harness Connector Views:

Diagnostic Procedure

Steps 1 - 2:

Steps 3 - 6:

Steps 7 - 9:

Steps 10 - 11:

Steps 12 - 15:

Steps 16 - 17:

Component Inspection
INJECTOR




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

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

If NG, replace injector.