Need help with SP1 wire into ECU (1JZ Cressida)

[Gary]

would you be so kind?

[Gary]

apparently not

in case anyone has a simlar drama to me;

as far as i can see for the S1 cluster, SP1 comes from the blue/red pin on the grey 10pin plug, and the speed input comes in via cable (mechanical)

the S2 cluster seems to get its speed input via the same pin as the S1 cluster outputs it to the ecm. so i think, the speed sensor goes into the blue/red pin on the grey 10pin plug. SP1 comes from the lightgreen/red wire a couple pins across, maybe
on the S1 loom its blue/red, on the S2 loom the same pin is yellow/green

cars not running at the moment so i havent checked if it works, but thats it as far as i know. ill update the shit later

[CrUZida]

The GX81 diagram I have is for a speed cable, not electronic sender.

[Mos]

The electronic speedo will have 4 screw terminals on it. Two are power and ground, one is signal in, one is signal out. If you know which one is SP1, you can work out which one is signal in... The label for SP1 is 4P, and signal in is some Japanese character.
Yes I do have the pinouts (somewhere - worked out myself) but it's easy enough to work out off the cluster itself - I had to retrofit a S1 dash loom into a S2 cressida.

The speed signal is the yellow wire in the plug that carries the water temp and oil pressure signals (and gear selection lights) and goes directly from the engine loom to the dash loom (it's the pin the S1 does not have). The dash loom plugs directly into the cluster. The engine loom connects to the gearbox loom which connects to the speed sensor - powered from the (IIRC) gauge fuse through the larger grey connector, and grounded to the engine. If you hook the speed sensor output directly into the cluster it should work.

Mos.

[Gary]

The GX81 diagram I have is for a speed cable, not electronic sender.

all good man, cheers anywho

mos that first paragraph is interesting, more or less confirms SP1 'output', the other terminal with the jap characters ends in a dead end though - which for me and my obviously stellar understanding of electrical track board floppy plastic blue stuff, didnt help me seems logical now that the soldered terminal opposite to the dead end leads to the same pin ive nutted out via ripping into an S2 cressidas loom. so that sorta confirms what i was on in my post above

cheers pretty confident it'll work now. might knock a diagram up or something if anyone else has had the same annoying time ive had working this shit out

[Mos]

Use a multimeter
Off the photos you posted, the jap char looks like it travels up to the plug directly above it (pin 6 from the right), through one jumper (piece of wire soldered on both ends - if you lift the pcb slightly you should see a short piece of wire soldered to the two pads "jumping" the other trace). 4P ends up on pin 4.
It seems the jap char also goes to pin2 of the left most connector in the photo, though I can't remember what that could've been for.
Mos.

[Gary]

dunno what that other pin does, i traced it down to an orange plug behind the drivers kick panel, which im pretty sure heads up and away behind the dash and back where the ECM is... i'll see if i can find out its the same wire as the speed input to the S2 cluster so could be important

[Mos]

If the orange plug has 5 wires on it it could be the progressive power steering ecu, though I would've thought it would've come off the SP1 signal.. hmm..

[CrUZida]

though I would've thought it would've come off the SP1 signal.. hmm..

So would have I. Infact, I would have comfortably bet money on it.

Cruise control runs off SP1

[Gary]

the orange plug has 9pins in use out of 11 or something

that other pin (one that seems to share the SP1 track on the cluster) could possibly be for cruise etc, it leads down to a corner i cant quite get to without removing lots more things

i might have em round the wrong way, lightgreen red should be speed input and the two yellow and green pins might be SP1 (yellow/green and blue/red for S2)

[madmont]

Here is the circuit you need to reproduce to make the electronic speedo work

and in english

These are factory diagrams and the numbering on the speed sensors is different although I would expect them to be the same

[benjamin]

Alright, Im bumping an old thread but I am having difficulty with getting my speedo to work. I have a series 1 cressida, but I have taken the electric speedo sender and dash cluster from a series 2. I have connected the yellow wire off the sender, directly to the terminal with the japanese characters on the back of the cluster(ie next to the one that says 4P). The black wire to earth and the red wire to 12v+(ign). I don't get any movement on the needle and I am hoping someone can shed some light on this for me. Does the red wire connect to 12v+ or is this incorrect?

[benjamin]

ok i have now checked the sender by spinning it in a drill and testing that the yellow wire is earthing. That seems like it works as my multimeter pulses when its being turned. Do I need to feed additional power inputs to the series 2 cluster if the standard cluster wiring is for a mechanically driven speedo?

[benjamin]

Success! The negative pickup on the back of the (series 2) speedo needs to be earthed as the standard loom (series 1) doesn't seem to have the provision for this. On the back of the cluster there is a black wire going from the tacho earth over to a point behind the temp gauge and then up to pin 3? on the 11 pin plug and this isn't an earth on the series 1. So after hardwiring a new earth my speedo needle moves. Now I just have to get it calibrated...

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where are you finding this series 2 diagrams