arctic cat M7 2004 dont start

[tkod307]

Hello everyone, I ask you to immediately forgive my clumsy English - I write through a translator.
Please help with the following problem. I went to the arctic cat m7 2004, stalled, now does not start.

Diagnostics performed:

• there is a spark;
• there is fuel in the fuel rail, the pressure is even higher than normal.

-Fuel injectors work if removed, but there is no signal to open when they are mounted on a snowmobile.

What could be the reason for the lack of a signal on the fuel injectors?

 

[jim]

I'm assuming you checked the injectors outside of the sled and triggered them with a 12v source. As for no signal...sounds like you have a bad ECU or coil. I doubt chaffed wire because that would only impact one injector. So, the signal is not there or the electrical power is not there...

 

[tkod307]

I'm assuming you checked the injectors outside of the sled and triggered them with a 12v source. As for no signal...sounds like you have a bad ECU or coil. I doubt chaffed wire because that would only impact one injector. So, the signal is not there or the electrical power is not there...

voltage plus comes to the nozzle, there is no control minus signal.
the computer does not give a minus signal. what could be the reason? for example crankshaft position sensor?

 

[jim]

I don't believe the fuel rail/solenoid is relying on the crank signal for timing...lots of latency there. What I know from personally triggering those solenoids with a 12V offline battery (for cleaning) is that they are normally closed with a 0V input. 12V and they open and allow fuel through. So not following the minus signal. Are you saying they are staying open and flooding the motor? Or is there no fuel at all? You said no signal to open in original statement...so I'm assuming they never open and motor is dry? Or is motor flooded? So, either it seems no signal from ECU to open or no power to open them. They need a signal and power to function...and sounds like they work when pulled out. So, ECU signal or wiring is suspect to me...

 

[tkod307]

I don't believe the fuel rail/solenoid is relying on the crank signal for timing...lots of latency there. What I know from personally triggering those solenoids with a 12V offline battery (for cleaning) is that they are normally closed with a 0V input. 12V and they open and allow fuel through. So not following the minus signal. Are you saying they are staying open and flooding the motor? Or is there no fuel at all? You said no signal to open in original statement...so I'm assuming they never open and motor is dry? Or is motor flooded? So, either it seems no signal from ECU to open or no power to open them. They need a signal and power to function...and sounds like they work when pulled out. So, ECU signal or wiring is suspect to me...

Fuel does not enter the cylinders. The engine will not start. A positive signal to the injectors comes with an ECU. There is no negative pulse signal and I do not know how to check
whether or not a signal comes from the ignition unit to the ECU

 

[gary ol kitty]

I would ohm the stator

Sent from my SM-G975U using Tapatalk