Do not apply battery voltage directly to Pin 2 for more than a few milliseconds. The ECM switches ground, not positive.
If you have a Check Engine Light (CEL) or symptoms like rough idling, white smoke, or a "dead miss," use the wiring diagram to guide the following tests. 4hl1 injector wiring diagram
Disclaimer: This article is for informational purposes. Always refer to your vehicle’s factory service manual for exact specifications and safety procedures. Do not apply battery voltage directly to Pin