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

[Jabtronic]

I have a 1JZ and R154 box in my Series I MX83, and am getting error code 42 which is for the speed sensor, I think because of this the car is cutting fuel at high revs.
At the moment my speedo isn't hooked up as it is cable driven (series II is electric) and the gearbox came with an electric sender screwed in, I'll have to trace where the wires from this plug are hooked into.

How do I wire up the SP1 ECU input in my Series I? Can I wire it straight to the electric speedo sender that is in my gearbox? But this would mean I have no working speedo.

I know that the Series II can be wired up to the ECU easily from the dash because it's electric, and has a yellow speed sensor wire coming out of the dash to the ECU, but what about the Series I? As far as I know it doesn't have the extra yellow speed sensor wire in the white (foam covered) plug behind the dash?

Hopefully this all makes sense, can anybody give me some suggestions?


3 MONTH LATER EDIT: I got this fixed up ages ago, I'm an idiot, what CrUZida stated is right and simple enough.. if you follow this diagram and hook SP1 up properly with the ECU wiring it should work
http://members.iinet.net.au/~shur/cressy/22pin.gif

[CrUZida]

SP1 comes from the dash to the ecu.
Get the speedo working, and hook that SP1 wire up, and all will be good.

[Jabtronic]

But does the Series one have a SP1 coming from the dash? I know that the S2 does.

When I did the 1JZ conversion (from a S2 MX83 into my 1989 S1) the S2 had a different white plug which only had one extra wire which is yellow and for the speed sensor.
My S1 plug didn't have that wire, and the plug is one pin smaller so didnt fit so I repinned the S2 plug and used that with no SP1 wire obviously.

Does my dash have a SP1 output anyway that just isn't wired?

[CrUZida]

Every EFI Toyota will have an SP1 coming from the dash.

It goes to the ECU so the auto knows when to shift gears.
It will already be in the glovebox as part of the dash loom, you just need to wire it in.

[JP]

Yep, as CrUZida stated, SP1 comes from the dash cluster.

If your gearbox has the electrical sender that screws onto the mechanical sender, remove the electrical sender and screw on the speedo cable from an auto series 1 MX83. Then your speedo assembly will output a 4 pulse per revolution ground signal that gets fed back to SP1 on the ECU.

[Jabtronic]

I tried that when I first got the jzx83 front cut and my series 1speedo sender didn't fit on. Here's some comparison pics I took when I tried it.

Left is electric R154 right is MX83 cable auto. Looks like I'll have to find the standard R154 cable sender, the teeth are different too.





I'll have to have a better look at the wiring, I had a printout somewhere showing the differences between the series 1 and 2 white plugs (behind glovebox, covered in the yellow foam). Series 2 had a speed sensor wire on it, series 1 didn't and the plug was one column less because of that. That's how mine was it had 1 less wire than the series 2 the engine came out of so I had to swap the plugs.

Guess I'll have to look around more, and study the MX83 ecu pinouts to find which one went to it.

[CrUZida]

Yeah, the auto stuff isn't transferable to the manuals.

But you may find a W5x speedo gear holder will bolt in.

[JP]

on the one I did, I screwed the 90deg cable sender into the sender that was originally in the box, that originally had an electronic sender screwed to the top of it.

[Jabtronic]

Yeah the electric sender in there is out of some 20v corolla box apparently, maybe it was only screwed in to give a speed signal. It's one piece are they normally two piece or something and the electric bit screws in?


I found the SP2 wire, it's light green and is pin 4 on this plug above the heater unit http://img204.echo.cx/img204/8407/untitled6ih.jpg (7M side)

So I was spinning the speedo cable with a drill to test the wire and snapped the cable because the drill was sort of hanging off it ARGH.. What readings should I get using a multimeter anyway?

[CrUZida]

Earths 4 times per rev.

[gtfloor]

Am also trying to find the sp1 signal from the dash to the glovebox connector and have had the same luck as Jabtronic ( NIL) mine is a series 1 also, series 2 is in the white plug with the water temp, oil light etc, I've most of the diagrams for the mx83 but cannot find this plug.

Please help I'm desperate to get the gearbox working correctly.

[CrUZida]

Find it on the back of the dash, and then you can easily find it on the glovebox connector.
It will definitely be one of the wires heading to the ecu.

If its like the MX73 there will be 2 screws, one either side of the connector where the speedo cable plugs in.
Follow the tracks these screws connect to.
One of these screws will go earth, the other will be the SP1 output.

[Jabtronic]

Series 1 MX83 doesn't have the wire on that glovebox plug like the series 2.

I used the SP1 (or SP2, not sure) wire that goes from the dash to the ECU. It's on the body plug
http://members.iinet.net.au/~shur/cressy/22pin.gif

Plug T on this 1JZGTE pinout ECU diagram..
http://img205.imageshack.us/img205/8...diagramcx2.gif

So just pin SP1or2 from the body loom to the SPD on plug T

[gtfloor]

Cheers for your replies, The way it's hooked up at the moment is to sp2 which is supposedly the gearbox speed signal, but as I have a soarer extension housing with cable speedo, sp2 is no longer used as it's disconnected, so would that be sending a dead signal? and sp1 I have found on the 1jz jzx90 ecu and it's not connected sp1 is located in the 22 pin plug ( think it's blue/white) will give it a try when I have some free time and see if this solves my auto problems.

Thanks for the diagrams but jzx90 ( jzz30) and jzx81 ( jza70) are completely different
does any body have an mx83 series 1 7m pinout with wire colours and functions?
Thankyou

[Jabtronic]

Here's what I found

Dodgy 1989 MX83 wiring diagram (very basic)
http://arrc.epnet.com/autoapp/9066/c...066fig6136.pdf

Factory TSRM ECU diagram and pinouts for the 7MGE in the MK3 Supra (same as Cressida pretty much)
http://www.cygnusx1.net/Supra/Librar...l.aspx?S=D&P=5


I'm pretty sure there's a proper TSRM online for the Cressida (I think thats what I used??) but can't find it at the moment..

EDIT: Comparing the Supra TSRM (22pin) pinouts to the MX83 22pin pinouts I posted earlier they seem to be different, so I'd discard this info for now. I'll try to find the page I used, I have them printed out over 3 pages but don't have them at home.

I also found these, which are apparently for a 90' MX83 (US spec)
http://jzxproject.com/bbs/viewtopic....r=asc&start=15