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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1346 (Engine Control System (Troubleshooting & Diagnosis) - 1.8L (LV6)) >> Troubleshooting >> Ignition Relay Diagnosis >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The ignition relay, also called the EFI relay, provides ignition positive voltage to the control module and other engine control components anytime the ignition is ON. One side of the coil of the EFI relay is always grounded. The relay is energized when the ignition switch applies voltage to the other side of the coil. The switch side of the EFI relay receives powered from the EFI fuse in the fuse block.-underhood. When the coil is energized, a magnetic field closes the switch side of the relay, supplying power to the following engine components:

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