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Discussion Starter · #1 ·
So when I got the bike the speedometer wasn't working. All the guage and instruments were good but it just read 0 mph at every speed. The day after the F1 code came up with the trouble light. Trouble code was 24 which is speed sensor. I haven't looked into it too hard but I just wanted to know what the likely culprit would be. Bad speed sensor at the sproket, cable pinched or cut, or maybe someone grinded off the tab to override the 189mph speed limiter? Should I follow the service manual procedure for checking the speed sensor, then trace the cable all the way up to the instrument panel? Where does the cable run through? Any help is greatly appreciated.
 

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'16 ZX-10R KRT
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:welcome:

So many typos though. :puter: "Grinded off" isn't even a phrase. Let alone grinding off a tab to overcome the speed limiter since that won't work. :wink:

First, it's an "FI" light. As in, Fuel Injection, Fault Indicator, etc. It's NOT an F1 light. As stated here....
http://www.zx-10r.net/forum/f28/all-gens-so-your-fi-light-218666.html

Secondly, it's likely the sensor is just bad. That's the common failure point on them. It's connected directly the harness, so if there's an issue with wiring, that's not likely and would require and new main harness for the whole bike.

Third, it could also be the instrument cluster, but that's rare. You'd have to pull the cluster, put power on it to fire it up on the bench, and then provide an input voltage on the speed sensor pins to verify that the cluster reads something. But the sensor itself is more common than this.

:hello:
 

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Discussion Starter · #3 ·
Great, thanks SkyDork. My bad, I just got the bike and was going off of stuff I read in the forums and the manual. Damn, thought it read F1, FI does make more sense. Lol. So how is the speed limited on the Gen 2s? I thought the ECU went off the speed sensor to know when to limit it.
 

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:welcome:

So many typos though. :puter: "Grinded off" isn't even a phrase. Let alone grinding off a tab to overcome the speed limiter since that won't work. :wink:

First, it's an "FI" light. As in, Fuel Injection, Fault Indicator, etc. It's NOT an F1 light. As stated here....
http://www.zx-10r.net/forum/f28/all-gens-so-your-fi-light-218666.html

Secondly, it's likely the sensor is just bad. That's the common failure point on them. It's connected directly the harness, so if there's an issue with wiring, that's not likely and would require and new main harness for the whole bike.

Third, it could also be the instrument cluster, but that's rare. You'd have to pull the cluster, put power on it to fire it up on the bench, and then provide an input voltage on the speed sensor pins to verify that the cluster reads something. But the sensor itself is more common than this.

:hello:
Those darn F1 lights :lol::lol::lol: Go Scuderia Ferrari.:badteeth::badteeth:
 

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REPOST Enforcement Mod
'16 ZX-10R KRT
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Great, thanks SkyDork. My bad, I just got the bike and was going off of stuff I read in the forums and the manual. Damn, thought it read F1, FI does make more sense. Lol. So how is the speed limited on the Gen 2s? I thought the ECU went off the speed sensor to know when to limit it.
It basically does limit the speed using the sensor and a couple other inputs, from what I recall. It's been 11 years since I had mine and was up to date on all the mods for it. :badteeth:

But, the speed sensor gets it's input from the output shaft of the transmission. So I'm not sure what "tab" the previous owner would grind off. If he cut a wire, that just makes the ECU think the bike isn't moving and may not defeat any limiter. Some people back then used to use a speedohealer to try and slow the displayed speed down some. But tons of people have had an erratic/failed sensor that does as you describe, so I wouldn't really worry about some sort of defeat setup until the sensor and cluster are checked out.
 

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It basically does limit the speed using the sensor and a couple other inputs, from what I recall. It's been 11 years since I had mine and was up to date on all the mods for it. :badteeth:

But, the speed sensor gets it's input from the output shaft of the transmission. So I'm not sure what "tab" the previous owner would grind off. If he cut a wire, that just makes the ECU think the bike isn't moving and may not defeat any limiter. Some people back then used to use a speedohealer to try and slow the displayed speed down some. But tons of people have had an erratic/failed sensor that does as you describe, so I wouldn't really worry about some sort of defeat setup until the sensor and cluster are checked out.
I hope Mercedes grinds their teeth to remove speed limiter and doesn't follow service manuals and take advice from fb mechanics,:crackup::crackup: Ferrari will have championship in the bag:thumbsup:
 

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I hope Mercedes grinds their teeth to remove speed limiter and doesn't follow service manuals and take advice from fb mechanics,:crackup::crackup: Ferrari will have championship in the bag:thumbsup:
Stranger things have happened! I'm sure someone at Mercedes has tried that. :idea: Go Ferrar1!

:spit:
 

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Discussion Starter · #12 ·
Yep, so my speedometer hasn't worked since I bought the bike. Today I finally looked at those connectors again. But I also noticed a solid connection on the bike which looked like a male connector. So I unplugged these connectors and connected the female one with the blue and yellow cable to the solid one, which I was guessing was the speed sensor. And sure enough rode it down and up the block, speedo working. F1 light gone.

I gotta removed the front seat once I find my Allen keys to figure out what those damn 2 connectors on the lil harness were for. Colors of cables were not with anything associated with the speed sensor in the service manual. So I figure its something aftermarket. Maybe a broken speedohealer or something? Or maybe it's just a troubleshooting harness? The harness for the speed sensor plugged into one of them, and the other connector was just lose
 

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