L1 GSXR 750 Gear idicator not working gauges says check - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 21 (permalink) Old 04-11-2017, 07:28 PM Thread Starter
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L1 GSXR 750 Gear idicator not working gauges says check

I have been having gear indicating issues that I would like help with trying to solve.
Along with my Gear indicator not indicating the gear its in, The gauges read CHECK and will not show the temp of the bike.
The neutral light is on while in neutral, and the bike will also shut off if put into gear while stand down.
Here is what has been done to my bike,
K&N air filter
Dano's GP-TRE
Full Yoshi R77D
Power Commander 5
Auto tune (Turned off)
The bike has been dynoed and tuned.

I figured it was the TRE messing up because the 1st ride I went on, was showing 4th gear for a few seconds everytime I would shift from neutral to 1st. but now it show absolutely nothing.

I removed the TRE, Tried cleaning the Gear position sensor.
Did not change anything.
Replaced the GPS with a Brand new OEM one. Was showing mileage on guage and temp of bike, But was not showing the gears on indicator.
After turning the bike off, and restarting a few moment later, the odometer was gone again along with the temp, odometer replaced with check.
You guy's/Gals have any ideas?
Thanks
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post #2 of 21 (permalink) Old 04-11-2017, 08:03 PM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

When did this begin happening? Did you recently install/modify anything?
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post #3 of 21 (permalink) Old 04-11-2017, 08:23 PM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

No recent modifications or installs.
It was kinda acting up last summer with slow response in the gear indicator in the 1st and 2nd gear.
This began to happen this year on my 1st ride.
Thanks for the quick response, I really appreciate the help
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post #4 of 21 (permalink) Old 04-11-2017, 08:31 PM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

This is pretty bizarre. Since you've removed the TRE and installed a new OEM GPS, I would begin inspecting the wiring harness for any defects and dirty/ corroded connection. I'm not entirely savvy with the electronics, but it also could be an ECM issue. That is purely speculation at this point. Once you check the harness and connections over, we can go from there and hopefully have someone else chime in if they have a better idea.
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post #5 of 21 (permalink) Old 04-11-2017, 08:57 PM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Thanks for the reply,
Was really hoping for a simple fix, like pull clutch in 3x and press rear brakes twice than proceed to start the bike....lol
I will go over my connections tomorrow, and I agree that it is bizarre.
Figured the brand new GPS sensor was the fix.
Will report back tomorrow
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post #6 of 21 (permalink) Old 04-12-2017, 01:41 AM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Kickstand sensor?
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post #7 of 21 (permalink) Old 04-12-2017, 04:53 AM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

If I understand correctly and the cluster shows 'CHEC' while the engine is startable and runs fine, then that would indicate a communication problem between the ECU and the dash. There's a wire running from the dash to the ECU, that's supposed to transmit serial data. On the K6/7, which is the only model for which I have a manual right now, it's the B/G wire and it should be the same on the L1, but if not, you should be able to figure out what it is, and what exact pin on the ECU connector it goes to, from the diagrams in the service manual. From your account of the problem, I suspect creeping corrosion causing communication trouble. Have you removed a pin from the ECU connector, in order to disable the EXCVA and left the hole unplugged?
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post #8 of 21 (permalink) Old 04-12-2017, 07:33 AM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Not the kickstand sensor.
Bike cuts out when put into gear still if you put the stand down while running.
Also, the fuel pump will turn back on after putting the kick stand back up while in gear and the bike off.

dpapavas
Thanks for the info.
Yes I did remove a pin a few years back when installed the Yoshi system, The pin removed was for the set valve delete. It was brown with a black chaser.
Im getting a good felling that my issue is gonna be solved with the help of this forum.
I will look into your suggestions
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post #9 of 21 (permalink) Old 04-12-2017, 07:15 PM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

So I got digging into my bike a bit today, looking for corrosion or dirty connectors.
All appears to look well. My bike has never seen rain and is stored indoors always. Garage is heated also.
I cannot find any signs of corrosion in connectors. Also pulled guage cluster off to inspect the plug there.
Any more ideas?
Really appreciate the suggestions
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post #10 of 21 (permalink) Old 04-13-2017, 04:47 AM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Have you tried locating the ECU to dash comm wire and measuring its resistance to make sure it's zero(, especially as you wiggle the wiring around to make sure it isn't make intermittent contact)?
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post #11 of 21 (permalink) Old 04-13-2017, 07:34 AM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

No I have not.
I found the B/G(Black with green tracer) wire you were speaking of at the ECU.
Cannot find that wire at the cluster end.
I also noticed that the A/B modes are not displaying, but with bike off you can hear it switching over
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post #12 of 21 (permalink) Old 04-18-2017, 10:06 AM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

I still cannot find the issue, Have checked the harness really well for corrosion or dirty connectors.
Using a multimeter is not in my specialties, and decided that I will be bringing my bike to the dealer and just tell them to fix it.
Dealership told me that I should have the bike back within 7 days. Which is not so bad considering the weather is not optimum for riding yet anyway's and the street sweeper has not been out yet either.
I will keep you guy's posted to what the problem is/was when I get my bike back.
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post #13 of 21 (permalink) Old 04-18-2017, 10:09 AM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Do you have access to a known good ecu? Can you swap one out with a friend to see if the problem lies with your ecu?

When you pulled the wire from the harness, did you seal the empty section of the connector to prevent any moisture from getting in?
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post #14 of 21 (permalink) Old 04-18-2017, 10:13 AM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

No, I do not have access to another ECU.
My friend had a identical bike to mine but he has sold it unfortunately.
also, I did not seal the empty section of where I removed wire. But There appears to be no sings of moisture or dirt to have gotten in.
I will put a dab of silicone into the empty hole. and thanks for the suggestion.
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post #15 of 21 (permalink) Old 04-18-2017, 10:39 AM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

What you are describing could also be a wire/pin/connector that is loose, causing intermittent faults.
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post #16 of 21 (permalink) Old 04-19-2017, 09:42 AM
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Quote:
Originally Posted by Nicklaurin View Post
No I have not.
I found the B/G(Black with green tracer) wire you were speaking of at the ECU.
Cannot find that wire at the cluster end.
I also noticed that the A/B modes are not displaying, but with bike off you can hear it switching over
I haven't been able to find an L1+ manual to consult, but if you do have one, it should contain pinouts, wiring diagrams and schematics which would allow you to find the correct wire. The absence of mode display, although the modes are working also points to bad ECU to dash communication, which means either the connection, or the transmitter circuitry in the ECU, or the receiver in the dash is bad.
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post #17 of 21 (permalink) Old 04-19-2017, 12:30 PM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Quote:
Originally Posted by dpapavas View Post
I haven't been able to find an L1+ manual to consult, but if you do have one, it should contain pinouts, wiring diagrams and schematics which would allow you to find the correct wire. The absence of mode display, although the modes are working also points to bad ECU to dash communication, which means either the connection, or the transmitter circuitry in the ECU, or the receiver in the dash is bad.
Thanks for the replies.
I do not have a manual. But figured that I was starting to get over my head.
I dropped my bike off to the dealer yesterday.
Might get it back this week they said, depending if I gotta wait for parts.
Will keep you guys posted to what the problem is/was for other who may encounter this issue in the future
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post #18 of 21 (permalink) Old 04-19-2017, 12:37 PM
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Re: L1 GSXR 750 Gear idicator not working gauges says check

I believe pin 22 is for the gear position.
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post #19 of 21 (permalink) Old 04-20-2017, 09:51 AM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

The Dealer called me, they are having a heck of a time locating the issue.
They had another bike similar to mine that they were swapping parts from.
My ECU And Cluster are fine. the problem lies somewhere in the harness from the ECU to the cluster.
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post #20 of 21 (permalink) Old 04-20-2017, 03:00 PM Thread Starter
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Re: L1 GSXR 750 Gear idicator not working gauges says check

Quote:
Originally Posted by Nicklaurin View Post
The Dealer called me, they are having a heck of a time locating the issue.
They had another bike similar to mine that they were swapping parts from.
My ECU And Cluster are fine. the problem lies somewhere in the harness from the ECU to the cluster.
So I got the call back from the dealer again.
6 Hours labour,$506.01 later, It turned out to be a broken wire in the harness.
No parts required, just the tech spending the day chasing wires.
Glad its fixed. Just waiting for the next nice day to go pick it up.
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