No Injector pulse

I have a 2020 Mercedes Benz Gla 250 4matic with no injector pulse. All fuses are ok and relay as well, this is driving me crazy, Could it be a bad ECM??

Nelsonpacheco23 wrote: I have a 2020 Mercedes Benz Gla 250 4matic with no injector pulse. All fuses are ok and relay as well, this is driving me crazy, Could it be a bad ECM??

It can. Is the no injector pulse also accompanied by no spark?

And can you communicate with the vehicle with a scan tool?

Yes we got spark and no problem with the scan tool. It Communicates with the ECU with no problem

You should have 12v at injector with key on and cranking. Make sure it doesn't disappear when cranking. I don't have a diagram for this 1 but you have to make sure your computer has all powers and grounds. Do you have an oscilloscope? Cam & Crank signals should be checked and several ignition signals should be checked to make sure there not jumping around trying to figure out where the motor is in crank angle space

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Here’s diagrams if you need em. If you find that you don’t have 12v on power side then you’ll need to check powers going into the module. Same thing goes for the ground. If you don’t have a scope and want to verify a bad ground you can use test light on B- and the ground wire at the injector. It shouldn’t light. You could also go B+ to ground at the injector and crank it and see if it pulses. If not, then check the grounds.