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Where is the enjector relays - Cars & Trucks

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

Injectors do not use relays, not on any cars I know of. When key is on, power should be available at injectors-pretty much a direct path from ignition switch to the injectors. How they work is the computer internally grounds an injector circuit for a split second, causing injector to fire, or pulse-opening the injector and spraying gas into the cylinder. To check the circuit, pull off an injector connector, and probe the two terminals with a test light, with the testlight lead grounded on the engine. With key on, one of the terminals should have a steady light. If no light on either terminal, the injector drive circuit has a fault. You will have to consult a repair manual for diagnosing the circuit.
If you had a steady light on one terminal, check the ground circuit: Put the testlight lead on the Positive battery post or cable, and while someone cranks the car, probe the terminal that did not light up the testlight. If working right, your testlight should be blinking- meaning the computer is grounding the injector circuit for a pulse-each time the light blinks.
If you need more help, please tell what year, make, model, and engine that you have. Good luck.
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