morbo
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Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 20, 2018 19:09:46 GMT -7
So, I installed a pair of Watsen signals tonight. I have a special knack for turning simple tasks into complicated ones. After I swapped the signals I started up the engine and immediately noticed the CEL was on. When I was wiring the new signals I would plug them in, flick on the key and test the signals. I never started the engine until after everything was all buttoned up (of course...). I disassembled and re-inspected all the wire harnesses. Doubtful I hit anything or damaged any wires, but I made sure all the connections were secured, no wires looked damaged. On the right side of the bike, I had to unplug one harness in order to remove/reinstall the right-side signal. I did remember to plug it back in before reassembling. While it was unplugged I turned on the ignition to test the signals (again, never started the engine). The picture below is the harness I unplugged. I think maybe this harness being disconnected when the bike did its start-up cycle/checks may have triggered the CEL. I don't have an OBD tool to check and don't know of any way to reset the ECU or otherwise clear the CEL. I tried disconnecting the negative terminal of the battery for a minute or so but it didn't do anything. I have the shop manual but I'm having a hell of a time trying to read electrical diagrams to try and decipher what it is. Can someone tell me what this harness is/does? Also, if anyone knows of a way to clear the CEL w/o an OBD tool? Tried searching but it looks like the OBD tool is the only way to read/clear the fault. Worst case, I take it to the dealer and see what they say.  |
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Post by RedAndBlack on Aug 20, 2018 23:06:22 GMT -7
Air temperature sensor I think. Not sure why that would give off a CEL.
I would leave it off the battery overnight. And then if that doesn't clear it, go out for a ride and see if everything running normal clears it.
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morbo
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Post by morbo on Aug 21, 2018 3:49:57 GMT -7
Thanks for the help! I kept looking at the diagram last night and I think that is where my best guess lead me was the air temp sensor.
I disconnected both terminals on the battery this morning; going to let it sit all day and then take it for a spin when I get home tonight.
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Post by evitzee on Aug 21, 2018 8:05:07 GMT -7
It seems that in most cases once a CEL is triggered it won't turn off even if the fault is cleared. Maybe this will be an exception.
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morbo
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Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 22, 2018 5:15:35 GMT -7
To no surprise, disconnecting the battery didn't clear the CEL. Rode to work this morning and it rode fine, nothing felt "off." I'll be calling a Yamaha dealer to see when I can get them to pull the code. Saw some different forums where people were making their own Yamaha 4-pin OBDII cable and it looked pretty simple so I may give that a crack at some point.
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Post by RedAndBlack on Aug 22, 2018 10:06:48 GMT -7
To no surprise, disconnecting the battery didn't clear the CEL. Rode to work this morning and it rode fine, nothing felt "off." I'll be calling a Yamaha dealer to see when I can get them to pull the code. Saw some different forums where people were making their own Yamaha 4-pin OBDII cable and it looked pretty simple so I may give that a crack at some point. Well was worth a try.
Do you have the link for any post like that? I'd love to take a look!
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morbo
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Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 22, 2018 11:14:23 GMT -7
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morbo
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Posts: 196
Likes: 129
Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 28, 2018 19:21:43 GMT -7
Alrighty... plug has been assembled. Need to get to a friend's house to test it out. If it works, I'll write up a "how-to." Fit like a glove; was actually pretty flippin' difficult to disconnect. For now, here's a few pics...    |
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morbo
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Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 30, 2018 10:53:52 GMT -7
Happy to say the DIY harness worked like a charm and I was able to confirm it was the IAT sensor I left unplugged. Cleared the CEL and all is good. Not sure how much interest is out there but I'll try to put together a "how to" tonight.  |
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Post by RedAndBlack on Aug 30, 2018 12:37:13 GMT -7
Happy to say the DIY harness worked like a charm and I was able to confirm it was the IAT sensor I left unplugged. Cleared the CEL and all is good. Not sure how much interest is out there but I'll try to put together a "how to" tonight. I think it would be great. I got lucky and snagged a used plug off Ebay for like $25 so I went that route but I think this would be extremely helpful to a lot of members.
My dealer would charge me $85 to clear that code as a diagnostic check. Maybe only the half hour if I got into it with the manager but that's still $40.
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morbo
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Registered: Feb 26, 2018 7:27:44 GMT -7
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Post by morbo on Aug 31, 2018 8:21:39 GMT -7
I think it would be great. I got lucky and snagged a used plug off Ebay for like $25 so I went that route but I think this would be extremely helpful to a lot of members.
My dealer would charge me $85 to clear that code as a diagnostic check. Maybe only the half hour if I got into it with the manager but that's still $40.
Cross-referencing in this thread in case anyone ever finds this in the future and doesn't want to go hunting for the how-to. |
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twistydave
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Post by twistydave on May 6, 2019 11:38:23 GMT -7
Thanks. The dealer told me to turn the key in the on position after disconnecting the negative from the battery to clear the ECU. I am a super novice at electronic trouble shooting. Just trying to pitch in.
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