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The mkiv Supra Owners Club

Code 42 -No. 1 Speed Sensor


GlennMR2

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heres my problem... i have been getting the engine man light coming on if i keep the revs over 3000. and the light stays on untill the car is switched off.

 

now i am getting code 42 which is number 1 speed sensor, i was looking on some old threads about this and also had some help from migster on trying to find out why im getting this, the car has had no de-limiter fitted and still runs and counts up in KM...

 

i have taken of the box on the passanger side footwell to have a look at the ecu where the speed signal wire goes in and this is what i have fount (look at pic)

 

now i dont know what the hell that has been done for but that might have something to do with the problem

 

does anybody have a clue as to why that extra bit of pink wire has been added like that...

 

thanks

ECU.jpg

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Well, that pink wire is the No1 vehicle speed sensor wire, and OMG it's got a scotchlok on it, and correct me if I'm wrong but is the additional bit of pink wire just cut and floating around in the breeze?! :blink:

 

-Ian

 

 

yes that wire is floating around in the breeze thats why im wondering what the hell it was for in the first place

 

:looney:

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Did Paul E sell you this car?? Talk to him first :)

 

 

yeah i did buy it from paul e but i dont think he will know about that wire unless he took sum stuff of it b4 i bought it from him :read: :read: :read:

 

but if your out there paul e and know what its for then give me a shout... cheers

 

:respekt:

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That wire could be some sort of converter or speed sensor for something else that has since been removed. With it flapping around in the breeze so as to speak it could and probably is shorting out. For now remove that crap scotch lock clip (which should have been done instead of just cutting the wire) and stick some insulating tape over the area that has cut insulation. If that cures your problem then you know that was what was causing it. If however your problem persists have a search again as there are a couple of things cause this and are documented as I had a code 42 and I fixed it using the advice I found under the search (mine turned out to be a dodgy wire at the odo connecter where a crap speedo conversion had been done)

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That is the wire you'd need to connect to to de-limit the car. It's also used as a sped pulse pick-up for other gadgets.

 

If the pink wire decides to touch the casing of the ECU it's sitting above. It'll definatly cause a error signal!

 

Alternatively, that crappy Scotchlok could be breaking the circuit going to the ECU, again resulting in an error code.

 

Remove the Scotchlok first, (and the extra bit of wire), and you may find what's causing the problem.

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ive gone all week with out this code 42 coming back.. and i was out in it tonight and the eng/man light come back on and this time the red triangle come on as well in the rev counter

 

i wasnt traveling very fast and was only on about 2000 revs but i was going up a steep hill when the light come on.....

 

i have no idea what could have caused ths to come back???????

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:looney:

 

taken from supraforums (search error code 42)

"Before you go and pull your tranny try tapping on the odometer.

 

The signal from you speed sensor goes through the odo before it gets to the ecu. It is a known problem for the signal to get "lost" in the odo."

 

I have had this code recently and my speedo went OFF at the moment its working again; likely to be a dodgy connection in my case. Worth a try though?

 

50 :D

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