08 TPS issue

BradenDF · 2025-10-12T20:43:25-0400

Hello everyone,

I've got an '08 600RR with 17k miles that I just did valve shims on, all went well on the mechanical side, and I'm having some electrical issues.

On its first startup, it idled at 1100 RPM and would sit at 1400 RPM when given a slight blip of the throttle. Any throttle past that point would immediately shut off the engine.

I'm getting an 8 blink code on the FI light, which is the TPS, so I started testing with a multimeter. I've got 3 wires: a black, a blue, and a yellow. The blue and yellow both read 5 volts, and the black reads around 4.84 to 5.08. I ordered another TPS for testing and got similar results.

Any suggestions on what it may be? I've checked every wire for damage and found none.

Thank you.

tary preisser · 2025-10-12T21:59:45-0400

8-1 = low tps V (below 0.3 VDC) or loose connection/poor contact.

8-2 = high tps V (above 4.93 VDC) sensor or circuit malfunction.

If you can get a Dynojet PC3-5 or above(?) It has a lovely real time TPS V indicator that helped me TS a poor TPS.

Turned out was not a tps prob....it was a defective PC5.....

BradenDF · 2025-10-12T22:05:39-0400

Yeah, I've heard a power commander can help tune a tps but wasnt sure if it was the best bet yet or not.

tary preisser · 2025-10-13T01:30:29-0400

There's very few threads on here about bad TPS problems....and replacing the TPS requires calibration....which is much easier to do w/a PC5......
Check connect carefully....sometimes the wires can be corroded inside the clip on either side of connect.....and you can't see it w/o a sharp look.....but crummy connect/corrosion is doing it's job and f'ing up the signal?

BTW, 8-1 or 8-2?

BradenDF · 2025-10-13T02:45:20-0400

I'm not entirely sure, if there's an actual way to check based on the FI light that you know of let me know. But based off of my multimeter readings I'm gonna assume 8-2.

tary preisser · 2025-10-13T19:25:53-0400

DTC flashes long and then short flashes.

8 long and then watch for 1 or 2 quick flashes after 8 longs....

Sometimes you've gotta watch it several times

BradenDF · 2025-10-13T19:44:56-0400

Sat and watched it for a while and it only ever did the 8 blinks and then a few other codes caused my stuff not being plugged in. Never did 8 and then 1 or 2 short blinks.

tary preisser · 2025-10-13T22:53:57-0400

So, you're not sure what the problem is.......maybe TPS....maybe not?

don't mess with it more?

" then a few other codes caused my stuff not being plugged in.

put everything back to original, and see what's going on?

08 TPS issue

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