No Spark, I've tried everything

jackdanels

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OK I've tried everything, and can't get a sled to run, but first the background





2008 Summit Everest 800 pTek 156" x 3"


Freshly rebuilt, and installed engine


Sled ran up until the engine destroyed itself, and even after that I could still get it to start.


It wasn't until after the new engine when in that it wouldn't start


I've got fuel


NO SPARK





Things I've checked:


Plugs for spark (8X) no spark


Connection to ignition coil (3X) ok


Kill switch (unplugged at handle bar, continuity to gnd on the ECM side, at the ECM plug only when the switch is in the closed position) all ok


Trigger coils orientation (before, during, and after installation) ok


4-wire trigger coil plug and it's wires (5X) ok


5-wire voltage regulator plug and it's wires (5X) ok


Jumped DESS post black wires together (3X) no change


Verified correct RD/BLU & BLK wire orenation at Voltage Regulator plug (2X) ok


Swapped ECM with a known good ECM that has been run on this sled successfully in the past. I will also note that this test ECM failed via budds, but ran for a whole season on the sled in question and just this last season on it's original sled without problem, which is why I don't get too worried if an electrical component test outside of BRP spec


Trigger coil resistance and output test at ECM plug (235 ohms & 0.025 VAC for both)


-Resistance in spec, VAC is low according to the service manual, but I have seen many electrical items test out of spec with these sleds and still run fine. This test also verifies the trigger coil plug connection


ECM plug pin 14 (PWR to ECM) continuity with RD/BLU wire at voltage regulator (1X) ok


Voltage check with RD/BLU wire at diagnostic connector, pin 4 (branched off the ECM power circuit) 2.5 VDC, within spec. Also verifies stator-regulator connection and output


Stator output test (1X) In spec


Continuity to gnd with any of the 3 yellow stator wires (1x) None show continuity to gnd


Ignition coil resistance at ECM plug (1X) Resistance a bit high, but I think still ok


After typing this I realize that I have not checked continuity to gnd from ECM plug at ignition coil signal wire with the lead unplugged at ignition coil. If this wire is shorted to gnd, could be the source of my no spark





Thank you all in advance for any help you can provide.
 
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Bnorth

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Why are you jumping the DESS post? It cannot be bypassed like an aftermarket tether.
 

jackdanels

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UPDATE**

Rechecked gauge cluster for connection problems and bent pins - all ok

Checked ignition coil low voltage wires for continuity to ECM plug (unplugged from coil) checked for continuity to gnd - only black wire has continuity to gnd (as I think it grounds the coil through the ECM - confirmation on this would be helpful)

Swapped trigger coil wires around at 4 pin plug by the voltage regulator incase someone switched them in the past
**Not my sled, and I didn't pay attention to coil orientation on teardown, as the same one is always on top** - make no difference, sled still doesn't start...
 

jackdanels

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As I told you on babytalk the ground wire from the ecm to kill switch should NOT have ground
I guess my language wasn't clear in my brief description of how I tested that circuit. What it was meant to say is:

With the ECM plug disconnected, there is continuity to gnd at the pin which runs up to the kill switch ONLY when the switch is closed
 

AreWeThereYet

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What voltage do you have coming out of the regulator RD/BU wire at the ECM pin 34?
 
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jackdanels

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What voltage do you have coming out of the regulator RD/BU wire at the ECM pin 34?
Are you referring to pin 14, ECM power supply?

Pin 34 is signal or gnd to relay, and is different colors.

As for the RD/BLU wire I tested it at the diagnostic connector (pin 4 - same wire) unless back probing I believe that ECM power supply cannot be tested with connector unplugged
 

brian h

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this may sound like a dumb question but is it elec start ? reason i ask is we had a sled with problem after engine swap and there was no spark. found out the small wire running to battery positive was not on battery it had slid into protective boot and did not get hooked up. even if battery is dead thae small wire and battery cable positive have to be connected
 

jackdanels

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this may sound like a dumb question but is it elec start ? reason i ask is we had a sled with problem after engine swap and there was no spark. found out the small wire running to battery positive was not on battery it had slid into protective boot and did not get hooked up. even if battery is dead thae small wire and battery cable positive have to be connected
No it's not e-start
 

AreWeThereYet

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Are you referring to pin 14, ECM power supply?

Pin 34 is signal or gnd to relay, and is different colors.

As for the RD/BLU wire I tested it at the diagnostic connector (pin 4 - same wire) unless back probing I believe that ECM power supply cannot be tested with connector unplugged

I'm at work but if I recall pin 34 is power and is joined to the regulator output. It is not ground for relay as they are running the relay backwards 85 power, 86 ground to ECM at pin 28.

Im looking at a 2006 diagram but should the the same, what happens when you unplug the reverse button as it kills power when pressed?
 
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