Electrical Advice?

[beermonster]

My bike is still off the road some five weeks after the last breakdown. The problem is that the injectors are not shutting off. Electrics are not my bag so handed bike over to an independent.

I am told that all the sensors check out, the bike has been subjected to electronic diagnostics and no fault codes picked up. On top of that crank sensor, injectors, TPS and ECU has been swapped to no avail.

The bike has let me down previously a couple of weeks prior to this latest problem and the fault lay with the fuel pressure regulator valve, which was replaced. Fuel pressure now also checks out.

My guy seems to think the problem is in the loom, the injector circuit checks out so it ain’t there either. Anyone by chance come across this problem or have any suggestions?

There seems to be no end to this.

 

[atkigasser]

You say the injectors are not shutting off ? My understanding is that the injectors open for a period on each cycle, the fuel pressure is constant, amount of fuel is controlled by injector open duration per cycle (this is how car systems work anyway).
Are your injectors on all the time ? How are you checking this, a meter is no good, needs to be checked with a scope to catch the pulses, the signal when to pulse usually comes from the crank sensor via the ECU.

 

[Steptoe]

, a meter is no good, needs to be checked with a scope to catch the pulses,

Or a bulb with with + & - wire attached , which you connect to the injector feed -

Snap on man in a van will also have a small tester, called a noide, which costs a couple of quid, and can be plugged in and used as a quick test for injector pulses.

 

[beermonster]

Thanks for taking the time to respond ,there is no spray pattern, it is a continuous stream which lasts for the duration of the cycle, there are no pulses.

Steptoe, Roy is going to PM you.