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  #31  
Old 03-17-2006, 04:50 AM
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Seeing how you guys helped JJ sort out his speedo I figure this might be a better place to continue the discussion on how I fix my 5 speed conversion issue. I now have the ECU functioning with the TCU pluged in and the idle working okay. I have checked the error code and it is 33 which I understand means "No signal from vehicle speed sensor 2" which is great news as the car is thinking straight even if I aren't. Harvey I noticed there is a difference in the speed sensor section on the 1992 manual and yours I am guessing you have the later one. Yours shows the speedo singal going to MPFI. I am open to the next suggestion please.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #32  
Old 03-17-2006, 05:49 AM
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b3lha b3lha is offline
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Hi Tony,

Your car is an Aussie model right?

In an Aussie SVX, the speed sensor connects only to the TCU (Harvey's diagram). Its signal is not suitable for the speedo and ECU so the TCU converts the signal to the right format and sends it out on another wire to the Speedo and ECU.

Your 5 speed box manual presumably has the same type of sensor as a JDM Auto box - which can directly drive the speedo and ECU without needing to be converted by the TCU. (My diagram).

If so then you can connect the signal wire of your speed sensor to the wire which previously carried the modified signal from the TCU to the ECU and speedo. This is a red and yellow wire that comes from pin c6 (Pin 6 of the third TCU connector).
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II

Last edited by b3lha; 03-17-2006 at 05:55 AM.
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  #33  
Old 03-17-2006, 10:41 AM
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Hi Phil how do I determine which wire is which on the gearbox end and is 1 12v, the other earth and the last signal? On your circut sensor is get "What" from pin A11 YR on the TCU. Don't see how your diagram give any info to the TCU now. Appricate the help.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #34  
Old 03-17-2006, 11:10 AM
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Phil were does the "A" go to from sensor 2 I assume it is to the speedo but still can't get my head around bypassing the TCU as not sure if the ABS and cruise control need a speed sensor singal to the TCU to function. If "A" is speedo then there must be two singals coming from the sensor 2 other wise the TCU can't compare.
Tony
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #35  
Old 03-17-2006, 12:13 PM
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b3lha b3lha is offline
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If you are looking at the JDM diagram, then A (in an octagon) is the power wire. It's a Red/White wire from pin 3 or the sensor to fuse 15 in the driver's footwell.

JDM diagram: http://www.subaru-svx.net/photos/files/b3lha/33820.jpg

Essentially, Pin 1 of the sensor is the signal wire. Pin 2 is Ground. Pin 3 is Power. Hopefully this is the same on the Impreza (or whatever vehicle you sourced your gearbox from).

On the Aussie Auto, the signal wire is white on pin 15 at the gearbox end. You could connect this to the signal wire of your sensor.

The other end of that white wire is at the TCU on pin a17. The TCU converts the signal and sends it out on pin c6. You don't need this conversion, so you can connect the white wire going into a17 to the Yellow/Red wire coming out of c6.

That Yellow/Red wire from c6 feeds the ECU, cruise control, speedo ... basically everything that requires a speed signal. It even feeds back into the TCU on pin a11 - this is what leads me to believe that the JDM and Aussie TCUs are the same part just wired differently.

Aussie Diagram: http://www.subaru-svx.net/photos/files/oab_au/13771.jpg

PS. Don't worry about the ABS, that's a standalone system with it's own sensors - one for each wheel.
__________________
Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II

Last edited by b3lha; 03-17-2006 at 12:17 PM.
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  #36  
Old 03-17-2006, 09:01 PM
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Thanks Phil I will give it a go I think I understand it have a few issues at work so won't get to it till later in the week. Do you think it is possiable to remove the TCU completely?
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #37  
Old 03-18-2006, 04:45 PM
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b3lha b3lha is offline
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Quote:
Originally Posted by Dessertrunner
Do you think it is possiable to remove the TCU completely?
I don't see why not. I think the guys in the US have removed theirs.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II

Last edited by b3lha; 03-18-2006 at 04:58 PM.
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  #38  
Old 03-18-2006, 04:56 PM
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II

Last edited by b3lha; 03-18-2006 at 05:00 PM.
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  #39  
Old 03-19-2006, 01:56 AM
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Phil, did the bypass and removed the TCU connected them together and then mesured the terminal 15 at the transmission white wire it has power it reads 9.5 V is that what it is supposed to happen. It would be good to read the voltage on a manual subaru to check that is what is suppose to happen.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #40  
Old 03-19-2006, 07:09 AM
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b3lha b3lha is offline
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I just measured the voltage of the signal wire on my car, it's 5 volts. Not sure why yours is higher.

The sensor is supposed to send a 5 volt square wave up that wire to the ECU.

Just to make sure everything is connected OK, test the continuity between your white wire at the transmission end and the yellow/red wire on pin b11 of the ECU.

If you want to be double sure then you could also check continuity with the speedo wire: If you pull out the mirror switch, you will see three plugs, Black, White and Blue. The white one (B40) has 18 pins. Pin 6 is a white wire that carries the signal to the speedo.

Finally, check that the sensor is producing the right signal. If you turn the sensor with the power and ground connected, and measure the voltage of the signal pin, then it should jump from 0 to 5 volts fours times per revolution.
__________________
Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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  #41  
Old 03-19-2006, 12:48 PM
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Phil might not have explained my self properly, the voltage I measured is the white wire that is now connected to the Yellow Red. Also were should I pick up the power at the gearbox?
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #42  
Old 03-19-2006, 05:24 PM
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b3lha b3lha is offline
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Quote:
Originally Posted by Dessertrunner
Phil might not have explained my self properly, the voltage I measured is the white wire that is now connected to the Yellow Red. Also were should I pick up the power at the gearbox?
Yeah. I understood. My previous post still applies.

There's no information in the service manual to say what voltage the signal wire floats at. I measured mine at 5v.

The important thing is that the sensor in your 5MT gearbox produces the same type of signal as the JDM/USA sensor - and that it is connected to the Yellow-Red wire that feeds the ECU, Speedo, Cruise Control, etc.

As far as picking up power at the gearbox, I would utilise one of the now obsolete wires from the transmission plug and then at the TCU end join it onto one of the black/white TCU power supply wires on b6 or c1. These are powered from fuse 16 in the drivers footwell.
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Subaru ECU and TCU Website
1992 Alcyone SVX Version L
1992 Alcyone SVX Version L
1994 Alcyone SVX S40-II
2004 Subaru Legacy 2.5 SE Sports Tourer
1996 Subaru Legacy 2.2 GX Wagon
1988 Subaru Justy J12 SL-II
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  #43  
Old 03-19-2006, 06:43 PM
oab_au oab_au is offline
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Significant Technical Input Registered SVX
Speed sensor.

I can't say what the US wiring is. I would have thought that somebody with a US manual would have posted a scan of the wiring by now. To help us with this.

All I can see is that the tcu can be removed. The new speed sensor is a Hall effect, and the output should be a square wave of 5 Volts to zero Volts. Unless there is some thing else that I can't see. The sensor needs a supply voltage to it, a ground, and the white output wire connected to the Red/yellow wire that is at pin c6 at the TCU plug, to drive the speedo.

I assume that the 12 volts that is fed to the sensor is regulated to 5 volts at the chip?

Harvey.
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  #44  
Old 03-27-2006, 01:00 AM
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Okay I have removed the gearbox sensor and the wire colours are white, Brown & Green in that order. The reason is that I wasn't getting a signal on the gearbox. Set it up on a power supply assumed green earth, brown +12v & white the signal put this on a scope and didn't get a thing when I rotated the drive. The Subaru agent had a play before and my have stuffed it so I have purchase a new one but don't want to screw it up till we think this through. Did I do the wires correct or has anyone got a suggestion to try.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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  #45  
Old 03-27-2006, 04:24 AM
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Harvey,
Just had thought after reading the info you and Phil have posted I think some were you said 5V AC was that correct because I was testing DC.
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX.
1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC)
1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car.
1995 - SVX Green low k mint condiation.
1995 - SVX Rally car, ex Matts car. Now to be used on track.
1992 - SVX red & Black being converted to Mid Engine.
1995 - SVX Red 143,000 bit rough.
Owned 5 others Subaru back to a 1974 1400 GSR.
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