Crank sensor

Alan,

Crank sensor is standard Hayabusa, they only normally show problems when either the wire is damaged or the sensor is damaged due to heat/debris from clutch.

Download the ECU data and see if the RPM signal drops out. You can also look in PTMon when cranking to see if you are getting an RPM Signal.

Check the pins in the crank sensor plug also.

Hi dan 

thanks for the reply. 

I am very suspicious of the sensor, it was doing what a typical road car would do , it was fine then once it heated up it shut the engine down , wouldn’t restart , then when left a while it started up again. 

But now it won’t start at all . When looking at pt mon , when cranking it intermittently reads the rpm, when it reads it for a second it lets a spit out of it then the rpm reading goes to zero again. Looks like a problem with the sensor / wiring . 

Do you have a picture of where the sensor is installed in the v8 ? And how to change it ? 

Thanks 

The sensor isn't really accessible with the engine in the car. It's a two-wire (magnetic) sensor and is a standard (as mentioned by Dan) Hayabusa part. 

You can see the wire loom from the sensor coming out of the bottom of the engine through the lower crankcase cover. It goes from there to the right side of the car. There should be a connector along there, that you can connect to an oscilloscope to see if the sensor sends a healthy sine curve while cranking.

Hope that helps.

Hi John 

I recently have replaced the clutch plates as they where worn . I wonder is this related ? 

can the end of the sensor be seen if the gearbox is removed ? 

Hi Alan, 

I found this one picture of mine... on its way to Spring Mountain for re-assembly once I'd repaired the lower crankcase casting problem. If you look closely you can see that the crank sensor is still attached to the engine, and it can't be seen from the back of the engine. 🙁

Thanks for the pic . 

I’m in trouble if it is a faulty sensor . 

You can hardly see it there in that pic . 

Crank sensor is not showing there in John's picture, it bolts to the two points just above the Blue oil gallery plug.

It is the same as replacing the clutch, just with the addition of removing the flywheel (This must go back on correctly as crank trigger is on the back of it).

Why did you replace the clutch? Maybe some debris has taken out the sensor or coated it with clutch dust.

If you still have the sure seal plug on the end then check the pins in that just in case. You will need to remove the pins from the plug to pull it through the hole in the crankcase anyway.

Thanks dan for that . I was wondering. I will be investigating more tomorrow to see what’s happened . 

yes, thanks Dan. I thought the sensor was in some secret location up inside the crankcase near the chain sprocket or something. I have no memory of seeing or removing it when I sent mine off for reassembly early last year.

The plot thickens 

Well, on the bright side, you have narrowed down the problem...

too much horse power in the starter!