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Up Topic Open Technical Section / C1 Technical Chat / Simple way to produce ECU fault codes
- - By jp72 Date 07-06-2007 06:07
Hi team,

(please see http://www.c1ownersc1ub.org.uk/cgi-bin/mwf/topic_show.pl?tid=4698#fp )

I managed yesterday evening to capture diagnostic data from C1 ECU *BUT* currently my C1 shows no present or past fault.

Any idea on how to SIMPLY (I don't want to dismount my C1) produce ECU or ABS unit faults ?

Thanks
Parent - - By beamish Date 07-06-2007 07:28
Put some crud between the ABS sensor.
Parent - - By jp72 Date 07-06-2007 08:50
Thanks! Any though for ECU fault code ? I was thinking of disconnecting lambda sensor...
Parent - - By andogas Date 07-06-2007 08:58
Disconnect the sensors one by one. This should give fault codes and you can still start the bike although I would imagine the fault would be logged when the ignition is turned on. This was definately the case with my Triumph when I turned it on with the fuel gauge sender disconnected.
Parent - - By Lawrie Date 07-06-2007 14:36
One of my C1's can still be an absolute cow to start, one day, on the button, the next, nothing :-(

Tried the GS911 & it showed NO FAULT at all, so once it WAS running, I disconnected EVERY SINGLE engine-plug except the injector, & it still started & ran fine.

I have also done the same on all my other C1's & they also, will all start & run with the plugs etc, disconnected, so yes they will start & run AND be flagged up on the diagnostics.
Parent - - By jp72 Date 21-06-2007 16:19
I sucessfully got fault code after unplugging Exhaust Oxygen sensor
However I could'nt produce any fault for ABS. What I did is put an aluminium paper sheet between coding wheel and ABS sensor and fire up the engine...
Any idea ?
Parent - - By Lawrie Date 21-06-2007 16:29
You WILL show a fault on ANY plug/socket disconnection, & these will be logged in the ECU memory & be flagged up upon hooking up to the GS911.
Try pulling all the engine plugs & switching on, then you will see them on the tool.
You my be able to help me here, on 2 of my C1's the diagnostic plug that has to be removed to fit the GS911, there is a loop-wire connecting 2 of the pins, this is visible from the outside,
these 2 bike have ABS, all the other C1's do NOT have this jump-wire, there is nothing connected to the blanking-plug, these bikes DO NOT have ABS.
Can you guys out there check & see if your bikes have this loop-wire?

>However I could'nt produce any fault for ABS  Try disconnecting the plug/socket from the sensor, it should flag up the fault.

Parent - - By Clunkfish Date 21-06-2007 16:31
Yep - got ABS and the loop wire.
Parent - - By Lawrie Date 21-06-2007 16:34

>Yep - got ABS and the loop wire.


AAHHH, now thats interesting, don't quite know why just yet though :-)
Parent - By jp72 Date 21-06-2007 17:51
Got the wired and removed it. In fact it's a plug that can be removed from the socket, so I recycle it for my diagnostic tool :)
So if you've got this plug, keep it for later use... :)

This plug just do a loop between DIAG signal and +12v, thus disabling any activity on the bus. (Activity is made by connecting GND to DIAG).

Hope it give some highlights
Parent - By bolt-on-billy Date 21-06-2007 17:26
got the wire and have also noticed that bmw mechanics would ccut them for some reason, early theories were that is was linked to the rev limiter but I cant say that it does anything.

regards gs911 it didn't help with the silver one I ended up cleaning everything out as it turned out in part to be a faulty brake circuit which stopped it starting but the dash wiring has been ripped apart in the past and cross patched due to corrosion in the blue dash connector.

for some reason the dealer or someone removed the brake fuse, the gs911 gave me no faults at all when I used it. It was only as I was tracking the continuity through the bike and board that I noticed the brake light wouldn't come on. It took a few sparks out of the dash wiring before it finally kicked in. So she runs now at least :-)
Parent - By timo Date 07-06-2007 18:36
That is great!  You electronic/computer/whatever skills are absolutely amazing.

I hope you get the other faults to show up once you create them. :-)
Up Topic Open Technical Section / C1 Technical Chat / Simple way to produce ECU fault codes

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