1150 non start. ECU fault?

mikeyboy

mikeyboy

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hi all, hoping for a eureka moment here as i am starting to doubt my conclusions:D
the bike is a 2002 1150 gs single spark.
no spark,no injector pulse.
hall sensor test carried out on a gs911 all seems good,
when the engine is turned over by hand the fuel pump is priming each turn of the motor.(which suggests the hall sensors are ok)
+10 v at the injector plugs when cranked(no pulse when checked with a noid lamp)
live data on the 911 showing its cranking at 250rpm(again suggesting the hall sensors are ok)
+12v at the coil (ign on)
+12v at the motronic relay and the brown/white wire is earthed when the side stand is lowered ,relay is energising/switching
bike tacho is not moving when the engine is cranked over
so it all seems to point to the the motronic ecu being faulty but i dont have another to swap onto it:mad:
any thoughts before i bite the bullet and order a replacement
mike
 
There is a possibility that you exited the GS-911 Hall Sensor test prematurely and left the Motronic immobilizer set. You can go back through the GS-911 procedure or pull Fuse 5 for five minutes to reset the Motronic.
 
Roger 04 RT said:
There is a possibility that you exited the GS-911 Hall Sensor test prematurely and left the Motronic immobilizer set. You can go back through the GS-911 procedure or pull Fuse 5 for five minutes to reset the Motronic.
Click to expand...
its possible but i cycled the ign as and when the gs911 instructed.
it had no spark or injection pulse before i hooked it up to the diagnostics,
i will pull the fuse in the morning .
the bikes owner replaced the battery recently and the bike ran rough after the battery was fitted,soon after it refused to start.
 
I would go back to first principles if I was you.

Fuel pump is priming. Do you have fuel pressure in the fuel line? If not a pipe off inside the tank could be your problem.

If you do have fuel pressure in the line, I would pop an injector and check physically if it's spraying fuel.

No ignition is pretty obvious, but could be your coil pack has failed.

There are two halves to the hall sensor. One sensor does the fuel, the other sensor does the ignition.

I doubt it's your motronic, they are pretty much bomb proof.

It's great having something like a GS 911, but try checking things physically before you rely solely on test equipment. After all your interpretation of the fault using the GS 911 has got you leaping into changing the Motronic. Could be an expensive mistake.

Ian
 
Ian J Hartley said:
I would go back to first principles if I was you.

Fuel pump is priming. Do you have fuel pressure in the fuel line? If not a pipe off inside the tank could be your problem.

If you do have fuel pressure in the line, I would pop an injector and check physically if it's spraying fuel.

No ignition is pretty obvious, but could be your coil pack has failed.

There are two halves to the hall sensor. One sensor does the fuel, the other sensor does the ignition.

I doubt it's your motronic, they are pretty much bomb proof.

It's great having something like a GS 911, but try checking things physically before you rely solely on test equipment. After all your interpretation of the fault using the GS 911 has got you leaping into changing the Motronic. Could be an expensive mistake.

Ian
Click to expand...

why remove an injector? its not being pulsed by the ecu!
both hall sensors are active/inactive as the engine is turned over.
i am certainly not leaping into changing the motronic ecu ,i am well aware they are very reliable,hence the post here
all of the supply circuits for the injectors and coil check out ok
the motronic relay and side stand switch test ok
the hall sensors APPEAR to be functioning ok
this only really leaves the ecu .(unless i am overlooking something)
i will certainly carry out the reset before doing anything more.
 
roger, i have read your post on the motronic reset.
one question,the only fault logged on the diagnostics related to the throttle position sensor and (i think) was open circuit upper or lower track and was an intermittant fault not currently present.
would it be possible for this to shut down the switching of the injectors and coil?
 
Unplug the TPS and don't touch the throttle while its unplugged and the bike should still start

10v to the injectors seems too low
 
mikeyboy said:
roger, i have read your post on the motronic reset.
one question,the only fault logged on the diagnostics related to the throttle position sensor and (i think) was open circuit upper or lower track and was an intermittant fault not currently present.
would it be possible for this to shut down the switching of the injectors and coil?
Click to expand...

I don't know. About a month ago I was testing TPS sensitivity and was connecting a pot only to the "sensitive" track, pin 1. I got an error re: TPS because the "coarse" track (pin 3) was open.
 
Mike O said:
Remembering that includes the cold start lever... :thumb2
Click to expand...

It should work with the Cold start halfway You need the extra air to burn the excess fuel at cold start

But at least if you get a fart or bang or two then You know you are on the right track
 
Hi,
The +ve 12v supplied to the injectors is battery voltage supplied via fuse 6 - so "low" voltage probably due to starter cranking?
You say no "pulse" at injectors - how are you checking? The +ve 12v at the injectors is constant - the ECU controls injectors by switching the -ve only, so your looking for a pulse on the negative only at the injectors NOT the positive. This may be what you checked of course!

Cheers....................Grizzly:beerjug:
 
Grizzly said:
Hi,
The +ve 12v supplied to the injectors is battery voltage supplied via fuse 6 - so "low" voltage probably due to starter cranking?
You say no "pulse" at injectors - how are you checking? The +ve 12v at the injectors is constant - the ECU controls injectors by switching the -ve only, so your looking for a pulse on the negative only at the injectors NOT the positive. This may be what you checked of course!

Cheers....................Grizzly:beerjug:
Click to expand...

i am checking the injector pulse with a noid lamp,i have battery voltage on the supply side when cranking,i also have +12v at the coil supply side.i dont have a wiring diag showing the ecu pin numbers but i am going to dismantle the ecu multiplug tomorrow to check continuity from the -ve injectors/coil to to ecu.the side stand switch and motronic control relay seem to be working ok.
to my way of thinking ;if the wiring is good,the hall sensors are good,the sidestand switch and motronic relay are working. the only thing left is the ecu
 
If the reset doesn't work make sure you have +12 on pin 1 of the Motronic.

Except for the No spark symptom, it also sounds like a clogged fuel filter or blown fuel hose in the tank.
 
Roger 04 RT said:
If the reset doesn't work make sure you have +12 on pin 1 of the Motronic.

Except for the No spark symptom, it also sounds like a clogged fuel filter or blown fuel hose in the tank.
Click to expand...

i can see the relevance of fuel pressure problems,BUT i have no injector operation!!
the ecu is not earthing the injectors.the first thing i checked was the injector operation ,before anything was disturbed.
so i will try and find time tommorow to do the reset etc and will report back.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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