Where does the injector pulse come from in a truck?
I guess no one reads….injector pulse comes from ecm..via ignition module..pickup coil.Once ecm senses 400 rpm,s from engine it takes over. But injectors pulse works off of ground from ecm…you have to have the grounds at thermostat and intake or will not pulse injectors.Grounds for all sensors.
How to check fuel injector pulse during priming?
What you need to do is check ground on one side and hot on the other with an ohm setting on your meter. One side should come back OL (ground side) and the other should come back .0001 Ohm (hot side) Then grab a noid light and check for injector pulse during priming.
How do you test a fuel injector ( ANS )?
Ans: By using a simple diagnostic tool called NOID light, this tool detects a digital signal coming from the ECU and flashes an LED light, so if there is no LED flashing during cranking, this means that there are no pulses coming out of the ECU. Question: How do you test a fuel injector?
What to do if there is no injector pulse?
If after all this you got the same result, so it’s time to check the injectors itself if there is no injector pulse on one cylinder, by try to unplug injectors one at a time, if the engine starts when a particular injector is unplugged so that it is the defected one that needs to be replaced
Ans: By using a simple diagnostic tool called NOID light, this tool detects a digital signal coming from the ECU and flashes an LED light, so if there is no LED flashing during cranking, this means that there are no pulses coming out of the ECU. Question: How do you test a fuel injector?
If after all this you got the same result, so it’s time to check the injectors itself if there is no injector pulse on one cylinder, by try to unplug injectors one at a time, if the engine starts when a particular injector is unplugged so that it is the defected one that needs to be replaced
What does it mean when PCM grounds fuel injector?
Now as far as the current flowing through, this should ramp up at about the same time as the PCM grounds that injector. It shouldn’t have a real high squared-off ramp; that’ll indicate high resistance and a lot of amperage trying to open that injector. Maybe the injector is sticking.
When does the fuel injector dip and close?
That dip is the point where the fuel injector is actually opening and starting to spray fuel. And then this is a current limited injector. So once it gets to a set current that the PCM dictates, it’s just going to level off and then close at the same time that the injector closes.