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Discussion Starter · #1 ·
I bought an Arctic Cat 550 alterra xt 2015.
Error: starts cold, but as soon as it reaches 45 degrees Celsius it does not start just drive the starter.
-Do not write an error code.
-It has compression.
-It has sparks.
Thanks for the help !
 

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Discussion Starter · #3 ·
Fuel pump runing
-Valve clearance ok
When plugged into the engine temperature sensor it operates a 2.2k ohm resistor, it feels 24 degrees Celsius. I added a new factory temperature sensor, but it's not good either.
 

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Discussion Starter · #4 ·
if I keep it fixed at 24 degrees Celsius (the resistance) it starts with a warm engine as well.

Any idea ?
Thank you !
 

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It sounds as though your ECU thinks it is in an overheat condition and will not start. A couple things to check:

  • Coolant level (unlikely, but a good idea to check considering the issue.
  • Make sure that the wiring harness between the water temperature sensor and the ECU is not shorting to ground somewhere along the run

What water temperature does the bike indicate without the resistor?
 

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Discussion Starter · #6 ·
Coolant level is OK. Cable is not shorted. Above 45 degrees Ceslius it does not start and stops. When I unplug the water temperature the meter starts but fluctuates at idle. It goes up to operating temperature by holding gas.
 

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Discussion Starter · #7 ·
Without resistance it shows 12 degrees with a cold engine and then moves upwards after starting.
 

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That is your manifold pressure. That change based on your current altitude.

You are looking for a page that reads "intake" on the top.
 

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That all seems okay. Have you tried to sync the EFI system?

The procedure follows:
1. With the key off, depress throttle lever to Wide Open Throttle (WOT).
2. Place the ignition key in the ON position and wait for 10 seconds.
3. Release the throttle lever and wait an additional 10 seconds.
4. Turn the key to the OFF position and allow the gauge to shut off.
 

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Unfortunately that is where I am with it at this point, it's rare to have an ECM fail, but it can happen. Do you have another bike you can swap from to see?
 
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