Electronics guru needed

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lotuslee
Posts: 319
Joined: Tue Feb 04, 2014 5:58 pm

Any electronic gurus amonst us :lol:
After fitting 4 new wheel speed sensors my speedo will not work the ABS light was illuminated but went out once driven and no fault codes.
Everything on the instrument panel works as it should just no speedo.
I have double checked all the hub sensors and they work as they should.
The car has variable slip traction control fitted but the traction control button on the centre console is not plugged in (console away at trimmers)
Anyway would this button not plugged in stop the speedo from working and the speedo getting a signal.
Checked all fuses etc and wires going into the instrument panel and all appear ok.
This is a 2010 black dash car.
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andybond
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It would be the most logical explanation why the speedo wasnt reading!
tlracer
Posts: 636
Joined: Mon May 26, 2003 11:00 am

Not too familiar with your specific Exige model. Presumably though, as the system is variable, it has some type of control to set the amount of slip?

If so - and that is what's disconnected currently - then the speedo is unlikely to be receiving any signal and hence isn't displaying what it should.
lotuslee
Posts: 319
Joined: Tue Feb 04, 2014 5:58 pm

tlracer wrote: Sun Jan 17, 2021 10:06 pm Not too familiar with your specific Exige model. Presumably though, as the system is variable, it has some type of control to set the amount of slip?

If so - and that is what's disconnected currently - then the speedo is unlikely to be receiving any signal and hence isn't displaying what it should.

Yeah you can limit the amount of slip from 8% to 0% and also adjust the launch control.
lotuslee
Posts: 319
Joined: Tue Feb 04, 2014 5:58 pm

Yeah you can limit the amount of slip from 8% to 0% and also adjust the launch control.
Cant do a great deal more until i get the button back as trying to read the Lotus Electrical circuit diagrams is a nightmare.
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Fonzey
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Joined: Tue Nov 27, 2018 12:17 am

I wouldn't lose any sleep over it until you can reconnect the TC switch and rule it out.

The slip % calculation comes from speed difference between the front and rear axle, so it's all intermingled with the ABS system and speedo output - so it's not a huge leap to assume they're related.

When I broke a speed sensor on my original hubs, the ABS light sparked up immediately, as it did another time when my wiring popped out of its p-clip and got burned through by the rim of my wheel around Blyton :roll:
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MrP80
Posts: 165
Joined: Thu Oct 11, 2007 10:14 pm

My speedo worked fine with both variable knob and Tc button removed recently

If you start the engine lots of times without the button attached I think you might have issues, something about the ECU checking 8 times fir the button then if not found it deactivated it.

Probably wrong but worth googling
lotuslee
Posts: 319
Joined: Tue Feb 04, 2014 5:58 pm

Thanks i was hoping that would not he the case, a world of chasing signals awaits ow joy 😪
seriouslylotus
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MrP80 wrote: Mon Jan 18, 2021 12:03 pm My speedo worked fine with both variable knob and Tc button removed recently

If you start the engine lots of times without the button attached I think you might have issues, something about the ECU checking 8 times fir the button then if not found it deactivated it.

Probably wrong but worth googling
Not wrong, as i mention earlier, Cant remember the number of times, But the rest is right
seriouslylotus
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Does the speeedo and rev counter go thru the reset sweep if you disconnect from the car and reconnect?
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