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The mkiv Supra Owners Club

How to reset Engine Management Light


Kammy

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Hi All,

 

I new to do the above after the garage has replaced the Temp sensor on my car which stopped the needle on the dash working. I've not done anything else so I'm presuming this is what has caused it. The needle now works but the light is still on.

 

Does anybody know anywhere around Sheffield I can get this checked or re set?

 

Thanks

 

Kam

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Tried this, left the negative terminal off for about 5-10 mins but still got the orange light on and the warning triangle stays on. Does anybody know where I can get this checked locally or in South Yorkshire? Thanks

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Then it sounds like you still have an unfixed problem. Use the paperclip trick to read off the error code(s), post the codes on here, and we'll go from there.

 

Ok, I'm presuming the attached info also relates to the NA Manual as it did show it was for a TT. In any case I did the paperclip thing and it gave me the error code 22 for the water temp sensor. As I said there was any issued as the needle was not getting a reading but I have been advised there was a loose wire which has now been fixed and my Temp needle is working fine. However I still cannot get rid of the warning lights. Any Ideas please to get this re set?

 

Thanks

 

KAm

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I don't have any experience of code 22, but at a guess it sounds like they've corrected the electrical feed to the coolant temp gauge (hence the gauge now works), but not the wiring that passes that signal on to the ECU.

 

I know the speed signal works in this way: the signal starts from the sensor itself, into the various dashboard gauges, and then finally on to the ECU. Sounds like the coolant temperature signal might do this too.

 

It would be helpful if you know a bit of the car's history. I wonder if a previous owner had an aftermarket temp gauge fitted: very unusual, but not unheard of. To have two independent faults on the same piece of circuitry suggests to me that the circuitry might have been deliberately removed/disconnected for some reason.

Edited by stevie_b (see edit history)
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I've had the car for 2 years now without this being an issue before so it seems strange that if it was an aftermarket one, that it is only casuing the problem now.

 

I'll get my garage to check out the wiring and see if there is another wire that goes from the sensor to the ECU.

 

Thanks

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I've had the car for 2 years now without this being an issue before so it seems strange that if it was an aftermarket one, that it is only casuing the problem now.

 

I'll get my garage to check out the wiring and see if there is another wire that goes from the sensor to the ECU.

Ah, I could be wrong about previous mods then :). Did your temp gauge just stop working one day (it can happen)?

 

Ask your garage about a wire from gauge to ECU, as well as sensor to ECU. It's more likely to be gauge to ECU.

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Pretty much. it became intermittent so I went to get it checked. I belive they said the wiring had just become loose so they've just pushed everything together. They did say that there were 2 sensors. I'm gonna presume one is the guage and one is the sensor. I'll see what they say.

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Nope as far as I know, all that was done was disconnected the temp sensor to send the signal to the ECU and then reconnect before disconnecting the battery for a re set. Everything is working fine now.

 

Kam

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