Leccy Speedo

[MR-2-Tastic]

Hi all, have a 93 K reg and it has the electronic speedo but its being very erratic in its reading...some it seems ok ,then next its reading waaay too high, like off the scale at times.!
Have replaced the 3 capactiors on the cluster board but still no help...Also have bought another sensor unit and replaced in the `box, an ebay new item....Wasn`t the exact same OE part number reference but the same shape/pins etc and it was cheap enough, £35..
I did read online that there is a speedo control module on passenger floor area , to investigate for water ingress but couldn`t find any module at all let alone this control module....
So I`m asking if there is actually a module..? Also, if anyone can point me in a direction to go....Don`t fancy spending £400 on an OE sensor if it isn`t the actual problem....
Replaced the 3 capacitors....so kindof ruling that out
Replaced the sensor.....kindof ruling that out
https://www.ebay.co.uk/itm/154280131628
Control module.....need to certify if there is one for this model and if so its location..?

Reg : K180 WBC

Thanks..!

[BYRNEY1984]

not sure about a module in the foot well. If I remember right the speedo sender in the gear box has 3 pins. 12v+ an earth and the signal wire to the dash. might be purple or pink maybe. I cant be 100 percent on the colour. I have the good old speedo cable on mine haha. you need to check that the wires are getting 12v+ on one, a good earth another and the last one pulses the speedo cluster something like 4 pulses per revolution so you will need to test continuity from the pin behind the instrument cluster to the speedo sender plug at the gear box end. if your car is an import check that there is not a KPH-MPH converter installed usually behind the instrument cluster. if any of the wires are bad that will most likely be the problem. when you swapped the sender was the plastic gear worn or damaged?

[jimi]

There isn't a speedo control module in the footwell. The signal come from the speed sensor to the combination meter and also connects to the ECU, ABS, Power Steering & Cruise Control modules & (if fitted)

The electrical diagrams are available to download here https://mr2oc.co.uk/downloads/technical-stuff/mk2.html

f I remember right the speedo sender in the gear box has 3 pins. 12v+ an earth and the signal wire to the dash. might be purple or pink maybe.

Violet (purple) = signal to combination meter
Brown = ground
Black/Yellow = +12v

Don't rule out the actual speedo dial being faulty, without proving it

Is your car UK or JDM ?

To find the correct speed sensor for your car go here http://www.japan-parts.eu/#
Input your VIN number (this will ensure you get the correct part number for your car and it's what Mr T uses) and search for SENSOR, SPEEDOMETER
If you can't get it to work PM me your VIN and I'll look it up in the Toyota EPC

[jimi]

Also a search of the forum will reveal a few other threads form people with a similar problem which may help https://mr2oc.co.uk/forum/search.html

[MR-2-Tastic]

Thanks Guys..!
Great info and help much appreciated..I`ll test the signals next...the car is a UK..

[MR-2-Tastic]

The OE part number is : 8318112030

[Ryano085]

There isn't a speedo control module in the footwell. The signal come from the speed sensor to the combination meter and also connects to the ECU, ABS, Power Steering & Cruise Control modules & (if fitted)

The electrical diagrams are available to download here https://mr2oc.co.uk/downloads/technical-stuff/mk2.html

f I remember right the speedo sender in the gear box has 3 pins. 12v+ an earth and the signal wire to the dash. might be purple or pink maybe.

Violet (purple) = signal to combination meter
Brown = ground
Black/Yellow = +12v

Don't rule out the actual speedo dial being faulty, without proving it

Is your car UK or JDM ?

To find the correct speed sensor for your car go here http://www.japan-parts.eu/#
Input your VIN number (this will ensure you get the correct part number for your car and it's what Mr T uses) and search for SENSOR, SPEEDOMETER
If you can't get it to work PM me your VIN and I'll look it up in the Toyota EPC

Sorry to just jump in, for clarity, am i correct in saying the above purple wire is 12v and differs from the purple w/white (which is actually 5V) wire found on schema and behind the dash (which is also associated with speed signal) i have got confused between these before.

thanks

[jimi]

They are different, the violet (purple) wire (I don't know what voltage it is, it could be 12v as the speed sensor has a 12v input) is the speed signal that comes from the gearbox speed sensor.
The violet (purple)/white wire carries signals from various ECU's signal ( ECU, Power Steering, ABS, ECT for auto's probably others I can't remember offhand)

[jimi]

Also I think that drawing in your post is for a cable driven (mechanical) speedo, the speed sensor symbol shown on the bottom right is for a reed switch, it generates a speed signal from the mechanical speedo drive.
The symbol for the electronic speedo version is different (it's basically a transistor symbol)

[Ryano085]

Also I think that drawing in your post is for a cable driven (mechanical) speedo, the speed sensor symbol shown on the bottom right is for a reed switch, it generates a speed signal from the mechanical speedo drive.
The symbol for the electronic speedo version is different (it's basically a transistor symbol)

Would explain why I struggled to see the gbox sensor anywhere, any suggestIons as to where I might find an electric speed sensore schema? Specifically for the mk2 gen2 3SGE jap

Thanks

[jimi]

From the diagrams I've got the 1993 elect diagrams are the first I've seen with the gearbox sensor. Never seen any specifically for a JDM REV 2, they may be out there somewhere but I've never come across them.
Most things can be worked out from the available diagrams

left schema

don't know what you mean ?