Totaly losing the plot, error code 42 AGAIN!

[The Raven]

Ive now read all 10 pages on the search,

 

N/A

 

Im still showing kms in the odo and the speedo face is in kms 180 top end.

 

This would lead me to think its never been delimted? so the dodgy delimter thing wont apply?

 

Will the splice trick work for me? or do i need a new speed sensor?

one way or another im going to fix it. Please help or im going to do something rather dumb to the car in anger.

[stevie_b]

Fear not!

 

It might have a speed converter: if you're used to feeling how fast, say, 30mph feels, then you can drive it when the speedo says 30, and you'll know if the spedo is in mph or kph. Or, a better way might be to get a mate to drive along a road at 30mph and follow him, and observe what your speedo says. It'll either say 30(mph), or about 45-50(kph).

 

I'll put money on that the odo reading in kms is nothing to do with your code 42. Ignore the units that the odo counts up in.

 

You most probably don't need a new speed sensor itself. If you're speedo reads in mph (regardless of what the sticker says in the middle of the speedo face ) you may have a defective speed converter which is failing to pass on the correct signal to the ECU.

 

So, most likely causes are:

1) faulty speed converter, if you have one fitted (easy to test whether you do or not). If you have one, try removing it and see if code 42 still occurs.

2) faulty SLD: not so easy to test whether you have one fitted. Unless you want to try driving at >112mph, best to look behind the dash and/or around the ECU for non-stock looking devices. Again, if you have one try removing it try to trigger code 42.

3) faulty odo unit failing to pass on speed signal to the ECU. Difficult to diagnose without swapping for a known good one.

 

HTH

[The Raven]

Cool,

 

thanks alot i was at the end of my rope with it.

 

I will put the tom tom in tomorrow and see what happens speed wise.

 

And driving at more than 112? im sure i can find a private road some where...................

 

I will report back

[The Raven]

OK.....

 

The speedo is still knocking over in km... thank god or ive been doing 150 alot. However....... on the private road........... the needle went way way past 180kph a look at the tom tom showed 140mph and still pulling. So i can take from that the car is delimted and its that that is causing the Error 42. Where would the offending delimter be? Going to sound dumb but where is the ECU. Il have the dash out in the mean time.

[ukApache]

Where would the offending delimter be? Going to sound dumb but where is the ECU. Il have the dash out in the mean time.

 

it does vary, but most of the time the delimiter is behind the dials (along with the speed converter ) The cars brain is in the passengers footwell. You need to remove or pull back the carpet, and there will be a plastic cover to take off which hides it

[stevie_b]

The speedo is still knocking over in km... thank god or ive been doing 150 alot. However....... on the private road........... the needle went way way past 180kph a look at the tom tom showed 140mph and still pulling. So i can take from that the car is delimted and its that that is causing the Error 42. Where would the offending delimter be? Going to sound dumb but where is the ECU. Il have the dash out in the mean time.

 

Good work! It seems the problem either lies with the TSD or a faulty odo unit.

 

Thinking about it, I'm not sure whether a TSD is likely to cause the error. It's usually the speed converter that causes it. I'd have a good look behind the dash and around the ECU for a non-standard device (smaller than a matchbox usually) spliced into the wiring

[georigg]

I dont know if this would help(or not) but I have also had the 4-2 error code showing........the actual fault was the "overdrive off" light would flash on-off and if I really accelerated hard then the engine warning light(right hand side of speedo/rev counter) would come on.

 

Nothing else would happen and switching the engine off and on again would stop the light flashing until the next time I went over about 60KPH.

 

Just fitted an NCS Systems converter to change the speedo to reading MPH(this is like the Thor Unit and fits behind the speedo, not at the gearbox as the cheap Ebay converters).

 

I now have a 180MPH speedo and the ODo is recording in miles(as with the Thor unit it just simply changes the rate at which the digits increase, you need to make separate arrangements to return the Odo to a lower reading, equivalent to the KM reading in miles).

 

Low and behold I now no longer have the dreaded 4-2 error code and the overdrive light has stopped flashing.

 

Just for info, I also linked the 40 & 41 Pin at the odo(and then cut the 40 pin) to give me "Miles" showing on the Odo, as shown on the Thor write - up.

 

I can recommend the NCS system converter.......easy job to install!

Rgds

 

Georigg

95 JZA-80 Aero

[The Raven]

Many thanks to all,

 

I think i found the offending error 42 match box of hell and one wire was less than well put in,

 

2 days no error.......pray for me.