Flashing engine management light 660Z - .: XT660.com

Shantz · # 1 15-04-15, 18:17

Out riding today and my 660Z just stopped running, when trying to start it turns over fine but fails to run. Whilst turning over the engine management light flashes fast all the time. The trip home was on the back of a truck! Any ideas what may be causing this?

Pleiades · # 2 15-04-15, 19:23

to XT660.com - not an ideal reason to post your first thread!

If the light flashes when the engine is turn over on the starter, it usually (but not always) means the main relay is defective.

It can also do this when there is a fault with the crank position sensor, ignition coil or lean angle cut-off switch. If these were at fault though you would expect to see the engine trouble light flashing a code when the ignition is turned on (and not turning over or running). Is there such a fault code flashing?

If there is no fault code flashing with the ignition on, suspect/check the main relay operation and its connections first.

Shantz · # 3 15-04-15, 19:31

Quote:

Originally Posted by Pleiades

to XT660.com - not an ideal reason to post your first thread!

If the light flashes when the engine is turn over on the starter, it usually (but not always) means the main relay is defective.

It can also do this when there is a fault with the crank position sensor, ignition coil or lean angle cut-off switch. If these were at fault though you would expect to see the engine trouble light flashing a code when the ignition is turned on (and not turning over or running). Is there such a fault code flashing?

If there is no fault code flashing with the ignition on, suspect/check the main relay operation and its connections first.

No fault code showing so maybe the main relay, its in the garage so hope to hear soon. I will post the outcome here for all to see. Thanks for your help and suggestions.

Shantz · # 4 18-04-15, 19:19

Quote:

Originally Posted by Shantz

No fault code showing so maybe the main relay, its in the garage so hope to hear soon. I will post the outcome here for all to see. Thanks for your help and suggestions.

Looks like there was a short on the wiring loom under the tank, this in turn blew a fuse and the fuel pump relay. Just waiting for a new relay and will be able to confirm the diagnosis. Should be back on the road soon.

Pleiades · # 5 18-04-15, 21:20

Quote:

Originally Posted by Pepsi

I think the XTZ is known to rub through its wiring loom against the frame rails under the tank. I'd systematically feel and sight along the main loom from the battery end up towards the head stock and find where it's tight against the frame and undo the cable ties and examine and repair accordingly.

It's usually in the area circled yellow. You can see where I have fitted foam pads to insulate vibration and prevent damage...

The culprit is usually the spur off the main loom that runs to the fuel injector.

Shantz · # 6 26-04-15, 14:08

Quote:

Originally Posted by Pleiades

It's usually in the area circled yellow. You can see where I have fitted foam pads to insulate vibration and prevent damage...

The culprit is usually the spur off the main loom that runs to the fuel injector.

Yes turned out be the exact problem you described, after the garage found and repaired the short it was just a case of a new relay and fuse. Very quick repair just time consuming finding the short in the first place.
Thanks for everyone's help here and I hope this helps someone in the future.

henston2 · # 7 26-04-15, 19:27

It is threads like these which make XT660.com so valuable to us all.
We all sometimes take things for granted on here, but the information, advice and knowledge posted, saves hours of head scratching and indeed cost.
Thanks to everyone who makes that extra effort to share these threads.

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