Intermittent ‘chec’ warning.

[KobyFitz96]

Hey folks,

My name is Koby and I'm new to the forum. I'm also a newbie owner of a 2004 gsx1400 so I just getting to know the bike at the moment.

Last couple rides I've been out the 'Chec' warning light has been coming up on the dash. It comes and goes. I've noticed it more often than not comes on when the bike is under heavy acceleration going up the gears then when I drop back down to normal speeds it clears and goes back to mileage display.

I know that the bike has a set of scorpion cans on that I'm reasonably sure hasn't been mapped/flashed to suit. It seems to run a little rich and it throws the FI light on sometimes unless I prime the fuel system a couple times before starting but only from cold.

But as for the Chec light I'm struggling to find any info for possible causes so any help or insight would be great.

Cheers.

[Hooli]

Ayup & welcome.

I'd bridge the 'dealer mode switch' before you go out & then when you trigger the fault you'll see the Cxx code displayed for what the bike thinks is wrong. That'll be much better than guessing, it won't be the mapping or lack of. There's no closed loop on these bikes so they don't know if they are running rich or lean.

As a total guess though, I'd suspect it's a C28 error the STVA, Secondary Throttle Valve Actuator. It won't be that though, but as there's no feedback to the ECU for the STVA, the only way the ECU knows where it is is via the TPS & SPS signals. I had a fault coming up for a year or two at higher throttle & around 4k rpm, I eventually worked out it was the SPS, Secondary Throttle Sensor, with a duff spot in it's range & confusing the ECU into thinking the STVA (which moves the shaft the SPS monitors) going wrong.

When you say you have to prime it, do you hear the fuel pump every time? there's a known thing for dirty contacts within the ignitions switch stopping the fuel pump powering up every time you turn the bike on. Oddly enough a partly blocked high pressure fuel filter can make it appear to run rich. The lower pressure from the blocked filter means the injector spray pattern is poor & you get incomplete combustion.

If you've not found it, there's a thread on the dealer mode switch somewhere & the official workshop manual is in the Downloads section of this site.

[KiwiCol]

Gidday Koby, welcome to the forum.  Sounds like you've got a few things going on with your 14.

[KobyFitz96]

Ayup & welcome.

I'd bridge the 'dealer mode switch' before you go out & then when you trigger the fault you'll see the Cxx code displayed for what the bike thinks is wrong. That'll be much better than guessing, it won't be the mapping or lack of. There's no closed loop on these bikes so they don't know if they are running rich or lean.

As a total guess though, I'd suspect it's a C28 error the STVA, Secondary Throttle Valve Actuator. It won't be that though, but as there's no feedback to the ECU for the STVA, the only way the ECU knows where it is is via the TPS & SPS signals. I had a fault coming up for a year or two at higher throttle & around 4k rpm, I eventually worked out it was the SPS, Secondary Throttle Sensor, with a duff spot in it's range & confusing the ECU into thinking the STVA (which moves the shaft the SPS monitors) going wrong.

When you say you have to prime it, do you hear the fuel pump every time? there's a known thing for dirty contacts within the ignitions switch stopping the fuel pump powering up every time you turn the bike on. Oddly enough a partly blocked high pressure fuel filter can make it appear to run rich. The lower pressure from the blocked filter means the injector spray pattern is poor & you get incomplete combustion.

If you've not found it, there's a thread on the dealer mode switch somewhere & the official workshop manual is in the Downloads section of this site.

Fuel pump audibly pumps pretty healthily every time. No sign of issues there.

Also remembered that my fuel gauge is not registering at all either. I'm thinking there's an electrical issue somewhere.

[KiwiCol]

Is the Chec associated with any rough running at the time?    Going by your description of when this occurs, it sounds like fuel to me, hard acceleration needs more fuel, slow down to normal speeds needs less.  You've also said the fuel gauge isn't displaying, this makes me think the bike may have been left sitting for some time, got a build up of crud in the tank & it's blocking the teabag & has crudded up the sender unit.

Both things need the tank off & remover the pump & sender unit, check them out & clean any muck around them.  While you're in there, do the pressure relief mod (bit of SS wire round the thing to stop it coming off)

Here's a link to the tank removal & other handy tips.  https://gsx1400owners.org/forum/index.php?topic=430.0

You'll want the tank pretty much empty to turn it upside down, as if it's too full, very expensive fuel will leak out the filler cap.

[GSXKING]

G'day Koby and welcome to the nuthouse 👍
You're in the right place to sort any issues with your GSX.
Is it your first bike ?

[Kiwifruit]

Welcome Koby.  Hope you get al your issues sorted promptly
 

[grog]

Welcome Mate👍

[Hooli]

Ayup & welcome.

I'd bridge the 'dealer mode switch' before you go out & then when you trigger the fault you'll see the Cxx code displayed for what the bike thinks is wrong. That'll be much better than guessing, it won't be the mapping or lack of. There's no closed loop on these bikes so they don't know if they are running rich or lean.

As a total guess though, I'd suspect it's a C28 error the STVA, Secondary Throttle Valve Actuator. It won't be that though, but as there's no feedback to the ECU for the STVA, the only way the ECU knows where it is is via the TPS & SPS signals. I had a fault coming up for a year or two at higher throttle & around 4k rpm, I eventually worked out it was the SPS, Secondary Throttle Sensor, with a duff spot in it's range & confusing the ECU into thinking the STVA (which moves the shaft the SPS monitors) going wrong.

When you say you have to prime it, do you hear the fuel pump every time? there's a known thing for dirty contacts within the ignitions switch stopping the fuel pump powering up every time you turn the bike on. Oddly enough a partly blocked high pressure fuel filter can make it appear to run rich. The lower pressure from the blocked filter means the injector spray pattern is poor & you get incomplete combustion.

If you've not found it, there's a thread on the dealer mode switch somewhere & the official workshop manual is in the Downloads section of this site.

Fuel pump audibly pumps pretty healthily every time. No sign of issues there.

Also remembered that my fuel gauge is not registering at all either. I'm thinking there's an electrical issue somewhere.

Ahh I'd be lifting the tank and checking the wiring then.

I've had the earth lead to the sender rot off before and the multi plug to the tank fail.
If the fuel level sensor isn't connected the gauge always reads empty.

If it's not that then Col's idea is where I'd go next too.

[Mick_J]

Welcome to the forum KobyFitz96.