Electrical Issue

[Darmah59]

So I bought a bike that had been stored in a barn for a while and it has an electrical issue that I am still trying to diagnose. When it powers up it shows two codes 89 and 44 which are both ECU communication errors. It also shows "ERR" where the clock normally is. I have checked all the fuses, electrical connectors where I can reach at present, looked around for any visible signs of rodent damage so far no luck. I have a Yamaha scan tool and while the lights will come on when ihook it to the OBD it says NO ECU PRESENT. Book says it could be a wiring issue or ECU problem.
Anyone seen or heard of anything like this and some thoughts on how to approach it?

 

[Quaap]

1) Check the battery (how old? If any doubt: replace)
2) Check if the ECU is present, remove, check connectors and build back.

https://www.off-the-road.de/media/pdf/c5/7d/42/ausbau_ecu_yamaha_xt-1200z-ze_super_tenere_final.pdf

 

[Darmah59]

Thanks new battery. The bike has 3000 miles on it, next step is to remove electrical and check ECU and wiring. According to owner he parked it and it was fine, tried to start and issue popped up. Hoping it is a mouse wiring thing and nothing else, cant imagine how an ECU would go bad while sitting in a barn with only 3000 miles on it.

 

[RCinNC]

I was just typing " barns equals rodents," when your last message popped up.

 

[Darmah59]

I was just typing " barns equals rodents," when your last message popped up.

It is certainly a possibility. I have been looking over the wiring diagram and there are two CAN wires that run between the instrument panel, ECU and ES module, if one of those wires is broken then there will be an issue, but finding it maybe a whole other story. Just not sure if you need complete connectivity all the way round and the codes point directly to communication between the instrument panel and ECU NOT the ES module although if this is CAN isolated due to a break it might not show up.

 

[~TABASCO~]

Yep - mice….

 

[audiowize]

https://www.ebay.com/itm/195406614505?hash=item2d7f244fe9:g:ls4AAOSwzqFhLqH9&amdata=enc:AQAHAAAA8GsD/MTNwxL34WZVn3IKYMvG5uZg7TVUqQZ1MXrPVCZsq/CwnNjQ6/CvUGEy1bSlBs4hhAiQAFlM5gH2wekigm9WD2fuFno3S/T/DZttZdBtmEL1RIuWiNIadric3h4h1Z8EHSSR5sgXf0HRnBFBAVU0f5i0eBojDi5ToPFcYms38tNVHfwl+qUVy5uUO22tkW5Vn/yMTuIu1KJWO50pZFyLgnEUdy04zOVlDqjYI8nA4CvB8QXbkP5vhugWRMr8ohd/1GNpZSdAj2MJJXmLiBu+P1MSn7kvfGjXKIzNFEAeI3qYwWEiZRki4x/PZAUcfA==|tkp:BFBM9MyZ6-xh

It's almost a certainty that you have chewed wires. It's not the easiest job to replace a harness, but I doubt it would take you more than a weekend.

Replacing the harness also means you'll get hands and eyes on most of the electrical, so you may end up discovering more issues to address.

 

[Sierra1]

 

[Jlq1969]

So I bought a bike that had been stored in a barn for a while and it has an electrical issue that I am still trying to diagnose. When it powers up it shows two codes 89 and 44 which are both ECU communication errors. It also shows "ERR" where the clock normally is. I have checked all the fuses, electrical connectors where I can reach at present, looked around for any visible signs of rodent damage so far no luck. I have a Yamaha scan tool and while the lights will come on when ihook it to the OBD it says NO ECU PRESENT. Book says it could be a wiring issue or ECU problem.
Anyone seen or heard of anything like this and some thoughts on how to approach it?

Just because you have a Yamaha scan tool, it doesn't mean that your scanner can read the ecu...if you say that it shows fault codes on the dashboard...then the ecu of that model doesn't have an OBD fault reading output... Where did you plug in your scanner?
I am assuming that the fault codes that you say it shows… it shows them on the dashboard…… since the scanner tells you that there is no ecu

 

[Jlq1969]

It is certainly a possibility. I have been looking over the wiring diagram and there are two CAN wires that run between the instrument panel, ECU and ES module, if one of those wires is broken then there will be an issue, but finding it maybe a whole other story. Just not sure if you need complete connectivity all the way round and the codes point directly to communication between the instrument panel and ECU NOT the ES module although if this is CAN isolated due to a break it might not show up.

That is a possibility…..the motorcycle does not use a can network to manage the fuel or ignition….the can network(digital signal) is only used to transmit faults codes to the dashboard and to be able to delete them from it…..that same network is the one that in the 2017+….they stopped going to the dash and went to a 4 pin connector that is behind the fuse box

 

[WJBertrand]

Maybe pull the harness connectors on the ECU, clean and firmly reseat them?


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[Checkswrecks]

Thread moved to appropriate sub-forum.

 

[Fennellg]

I would start with obvious. Get to the ECU. Inspect look to see if any wires have been chewed. Disconnect and reconnect see if anything changes. If you know anyone with a super tenere try your ecu in their bike If no wire damage found.

This will tell you if your ecu is the problem.

 

[Darmah59]

Just because you have a Yamaha scan tool, it doesn't mean that your scanner can read the ecu...if you say that it shows fault codes on the dashboard...then the ecu of that model doesn't have an OBD fault reading output... Where did you plug in your scanner?
I am assuming that the fault codes that you say it shows… it shows them on the dashboard…… since the scanner tells you that there is no ecu

I used the OBD plug down by the right frame near the tool kit.

 

[Darmah59]

Update, I have stripped a lot of bike down and see no evidence of rodent damage. Have checked continuity between the three main electronic boxes(dash, engine, suspension) for power, ground and also checked both sides of CAN and they all test fine. According to the manual this means the ECU is fried.
So looking for a 2BS-8591A-30-00
If I buy a new one does anyone have access to a "good" pricing and also does it come pre-flashed or does a dealer need to do this?

 

[Jlq1969]

I used the OBD plug down by the right frame near the tool kit.

So, are you saying that the dashboard shows you fault codes... and you also have a "4-pin" connector, on the right side of the motorcycle?... It's strange... it would be a Hybrid

 

[Darmah59]

Yamaha has their own OBD connector it is a 4 pin square harness behind the right plastic panel near the tool kit. The codes show 89 and 44 which are communication codes from the dash saying it cannot communicate with the ecu. As the ECU is dead the code reader wont connect so I cant get any more information. The OBD connector consists of a power, ground and 2 CAN wires, the OBD powers up but says no ECU, so the power and ground are good but the CAN is not talking.

 

[Jlq1969]

Yes... the S10 +2017 have an OBD connector, that's why it doesn't show the fault codes on the dashboard. The -2017, do not have the OBD connector, and the fault codes are read and erased from the dashboard
The normal thing in an S10 with an OBD plug is that the check engine light comes on and with a scanner, read the fault codes in the scanner. An S10 "without" OBD plug, the reading of the fault codes is done and erased on the dashboard. The Dash is not a fault code generator, the faults are generated by the ECU... "assuming" that on your motorcycle with OBD output, it also shows the fault on the dashboard... fault 44 is a common fault that usually appears in a hard start , when the battery runs out and the self-check does not finish during start-up.
But fault 89 refers to the SCU (which has no communication with the ECU), you should check the scu fuse and the scu plug which is the black box under the seat. If there is no "today" communication between the ECU and the dashboard, probably those codes are old. They weren't deleted "before"......

 

[Fennellg]