Author Topic: Fault code 12  (Read 3536 times)

sparklie

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Fault code 12
« on: June 23, 2019, 07:57:51 pm »
Hi anyone,
 I have had a fault code 12 come up on my dash, a mechanic said it could be a corroded plug giving an incorrect reading. I have found one under the seat, does anyone know of another or another reason for this fault other then a faulty sensor or crank in the wrong position. The bike was working fine until I went start it for the third time that day.

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Tartofraiz

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Re: Fault code 12
« Reply #1 on: June 26, 2019, 09:04:48 am »
Hi anyone,
 I have had a fault code 12 come up on my dash, a mechanic said it could be a corroded plug giving an incorrect reading. I have found one under the seat, does anyone know of another or another reason for this fault other then a faulty sensor or crank in the wrong position. The bike was working fine until I went start it for the third time that day.

It should be a faulty crank position sensor, but it's misleading because I have never seen it happen. If you want to be sure, just check :

Unplug the big ECU connector
Measure resistance between pin 3 on the first row (from the right) and pin 7 on the second row (from the right)
Target value : 300 ohm +/-20%




Most common causes :

Faulty relay
Faulty starter motor (loose magnet(s) and/or worn brushes)

If it's the starter motor you may want to salvage it as they are pricey  ::)

Edit : you may also want to try something that some other people did : put the bike in 2nd gear and push it (the best you can). It sort of "resets" things. This trick obviously doesn't work if you have a real problem (relay or starter motor).
« Last Edit: June 26, 2019, 10:34:44 am by Tartofraiz »

Nikk

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Re: Fault code 12
« Reply #2 on: July 03, 2019, 07:07:37 am »
Jules, you’re the new Otto (old joke...)

Tartofraiz

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Re: Fault code 12
« Reply #3 on: July 03, 2019, 07:44:36 am »
Jules, you’re the new Otto (old joke...)

I wouldn't compare myself to Otto ... 

sparklie

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Re: Fault code 12
« Reply #4 on: July 03, 2019, 09:00:06 pm »
Thanks for the reply.
I have taken out the starter motor and connected it briefly to the battery and it still didn't turn so it looks like I am going to have to sort this out first. After taking it apart it all looks fine, no funny smells, the brushes are worn but it all looks un damaged. 

Tartofraiz

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Re: Fault code 12
« Reply #5 on: July 04, 2019, 10:19:24 am »
If I were you I'd check the magnets too. Some might come off as they are generally not very well glued.

Get some epoxy glue and glue back the ones that come off. Be careful not to damage the magnets when you try to pull them off. Glue back one magnet at a time and of course put them back exactly in the same position ...

gorilla

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Re: Fault code 12
« Reply #6 on: July 05, 2019, 03:32:14 pm »
Been there done it in the end new starter  :(

sparklie

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Re: Fault code 12
« Reply #7 on: July 17, 2019, 10:44:33 pm »
ok, I have fitted the new starter and still no joy, I can run the bike by shorting the starter solenoid. The crankshaft sensor has 294ohnms, so that looks ok.
What's next, anyone got any ideas?

Tartofraiz

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Re: Fault code 12
« Reply #8 on: July 18, 2019, 11:57:40 am »
ok, I have fitted the new starter and still no joy, I can run the bike by shorting the starter solenoid. The crankshaft sensor has 294ohnms, so that looks ok.
What's next, anyone got any ideas?

Starter relay ?

sparklie

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Re: Fault code 12
« Reply #9 on: July 21, 2019, 07:31:53 am »
Thanks Jules, you were right, the solenoid was clicking but not making the connection to send the supply to the starter motor. Speaking to a local mechanic, he thinks the starter motor probably burn't out due to the relay fault. If I could find out how to post a picture I would include the contacts inside the relay, one side was brass coloured the other showing signs of heat damage. I went out on the MT after fitting the new one, I love this bike, I don't think i'll ever get another (unless it's an MT01), mine has a full akrapovic system which really adds to the ride. What a beast!!

Steve

Tartofraiz

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Re: Fault code 12
« Reply #10 on: July 25, 2019, 03:44:43 pm »
Steve,

I would we surprised if you had a burnt out starter motor. Normally when the relay fails, the damage stops there. But maybe something else happened ?

Glad to see you got it up and running again. 8)