Help with 89 S4 from Japan..! Wiring Diagram anybody?

Boomerang Baba · 09-20-2009, 08:40 AM

Hello,
I have a 928 S4 Auto 1989 from Japan that has an issue with the Cat temp.
As soon as the car is started it flashes on the speedo: Cat Temp too high...
The car has a double set of cat sensors at the back of the cat that mysteriously disappear into the car...
Cant find the wiring diagram in my workshop manuals.
Missing....
Does anyone have that?
Please advice.
Cheers, Michael

John Speake · 09-20-2009, 08:51 AM

Sheet 4 bottom RH corner....

Boomerang Baba · 09-20-2009, 07:05 PM

In the service manuals..?
I seem to be missing that volume....
Any place it can be found online...?
Thx.

John Speake · 09-21-2009, 06:05 AM

Yes Vol VII of the WSM for MY89. You need to buy the WSM CD-ROM set from Roger Tyson, 928sRus

heliflyer · 09-21-2009, 07:22 AM

Send me a PM with your email address and I'll send you the relevant diagram.

Vilhuer · 09-21-2009, 08:40 AM

http://www.cannell.co.uk/928_Worksho...%20Diagram.pdf

Boomerang Baba · 09-25-2009, 08:07 PM

Thx so much!
We finally sorted it....!
Very unique this Japanese system.
Nice to drive it again without that red light dancing on my face every moment!
You guys are invaluable....

Mike B · 09-25-2009, 08:27 PM

May I ask what you did to eliminate the flashing red "CAT" light?

the flyin' scotsman · 09-25-2009, 08:57 PM

Fuse or bulb removal would be easiest Mike.

Has your car had the CAT removal surgery done?. If not I thoroughly recommend the X-pipe, GT resonators with GT rear muffler. Best of all worlds IMHO.

Mike B · 09-27-2009, 05:27 PM

Never thought of the bulb removal...Thanks Malcolm. I wonder if I can reach up there with out pulling the pod?

I do have the x-pipe which makes the flashing red "cat" light even more bizarre as there are no cats!

mirousse · 09-27-2009, 06:54 PM

Micheal,

I own an 89 S4 ROW imported from Japan. This message appeared from time to time. My air pump was disconnected and the CATs ran quite hot. I rebuilt the pump and put it back to service. I no longer get this message.

This may not be relevant to your problem but may give you a clue on how to end the CAT TEMP TOO HIGH message. I used to have a tire pressure warning message when starting the car (my sensors are disabled). I managed to put an end to it by using the following procedure:

http://www.928.org.uk/resources/75-i...ng-system.html

There is certainly a way to end your warning message with a similar procedure. It's matter of finding the box that manages it.

Michel
89 S4 ROW
Montreal, Canada

mirousse · 09-27-2009, 06:57 PM

Mike,

Pulling the pod is easier than you think. I takes about 10 minutes to get to the circuit board that hold the bulbs. Take this opportunity to change the unserviceable bulbs...

Michel
89 S4 ROW
Montreal, Canada

Mike B · 09-27-2009, 07:35 PM

Thanks for the ideas Michel...I would rather not pull the pod...again, but if I have to I will. I already gutted her once

Garth S · 09-27-2009, 08:32 PM

One can unscrew the gland nuts holding the two thermistors in the CAT's rear end, pull the ~50mm long elements and safety wire them up out of harms way: seal the thermal wells with two caps .... & drive on.

I experimented with CAT bypasses on my '88 Japan model, and left both sensors hanging to read ambient temp - never a problem.

Mike B · 09-27-2009, 08:38 PM

Thanks Garth!

09-20-2009, 08:40 AM	#1
Boomerang Baba User Join Date: Jan 2006 Location: Sweden and the East Posts: 159	Help with 89 S4 from Japan..! Wiring Diagram anybody? Hello, I have a 928 S4 Auto 1989 from Japan that has an issue with the Cat temp. As soon as the car is started it flashes on the speedo: Cat Temp too high... The car has a double set of cat sensors at the back of the cat that mysteriously disappear into the car... Cant find the wiring diagram in my workshop manuals. Missing.... Does anyone have that? Please advice. Cheers, Michael

09-20-2009, 08:51 AM	#2
John Speake Addict Rennlist Member Rennlist Site Sponsor Join Date: Feb 2002 Location: Cambridge England Posts: 4,126	Sheet 4 bottom RH corner.... __________________ John '86 Euro S2 SharkTuned LH & EZ-F www.jdsporsche.com Home of the SharkTuner Rebuilt LH, EZK ECUs & MAFs available from agents worldwide Diagnostic testers for all models of Porsche 1987 >

09-21-2009, 06:05 AM	#4
John Speake Addict Rennlist Member Rennlist Site Sponsor Join Date: Feb 2002 Location: Cambridge England Posts: 4,126	Yes Vol VII of the WSM for MY89. You need to buy the WSM CD-ROM set from Roger Tyson, 928sRus __________________ John '86 Euro S2 SharkTuned LH & EZ-F www.jdsporsche.com Home of the SharkTuner Rebuilt LH, EZK ECUs & MAFs available from agents worldwide Diagnostic testers for all models of Porsche 1987 >

09-21-2009, 07:22 AM	#5
heliflyer Addict Rennlist Member Join Date: Aug 2008 Location: Isle of Skye Posts: 81	Send me a PM with your email address and I'll send you the relevant diagram. __________________ Cheers Jay 1986 Euro 928S Auto 1996 Land Rover Discovery 300TDI 60ft Steel Schooner "Moonbeam"

09-21-2009, 08:40 AM	#6
Vilhuer Addict Rennlist Member Join Date: Jun 2003 Location: Helsinki, Finland Posts: 5,780	http://www.cannell.co.uk/928_Worksho...%20Diagram.pdf __________________ Erkka *1992 928 GTS* 5-speed Oak Green Metallic 22L Classic Gray MX 1992 928 GTS automatic Amethyst Metallic 38A Magenta PZ**

09-20-2009, 07:05 PM	#3
Boomerang Baba User Join Date: Jan 2006 Location: Sweden and the East Posts: 159	In the service manuals..? I seem to be missing that volume.... Any place it can be found online...? Thx.

09-25-2009, 08:07 PM	#7
Boomerang Baba User Join Date: Jan 2006 Location: Sweden and the East Posts: 159	Thx so much! We finally sorted it....! Very unique this Japanese system. Nice to drive it again without that red light dancing on my face every moment! You guys are invaluable....

09-25-2009, 08:27 PM	#8
Mike B Done With Sidepatch Rennlist Member Join Date: May 2001 Location: Calgary Posts: 3,520	May I ask what you did to eliminate the flashing red "CAT" light? __________________ 88 928S4 86 951 928OC member

09-25-2009, 08:57 PM	#9
the flyin' scotsman Addict Rennlist Member Join Date: Oct 2004 Location: Southern Alberta, Canada Posts: 5,916	Fuse or bulb removal would be easiest Mike. Has your car had the CAT removal surgery done?. If not I thoroughly recommend the X-pipe, GT resonators with GT rear muffler. Best of all worlds IMHO. __________________ Malcolm '88 928 S4 A/T Black/Ivory, 160k kms 928OC Alberta Chapter avatar: Neil Young - Rockin' in the Free World music: the hunger http://www.youtube.com/watch?v=aHAn34xWChM

09-27-2009, 05:27 PM	#10
Mike B Done With Sidepatch Rennlist Member Join Date: May 2001 Location: Calgary Posts: 3,520	Never thought of the bulb removal...Thanks Malcolm. I wonder if I can reach up there with out pulling the pod? I do have the x-pipe which makes the flashing red "cat" light even more bizarre as there are no cats! __________________ 88 928S4 86 951 928OC member

09-27-2009, 06:54 PM	#11
mirousse User Join Date: Apr 2008 Location: Québec, Canada Posts: 114	Micheal, I own an 89 S4 ROW imported from Japan. This message appeared from time to time. My air pump was disconnected and the CATs ran quite hot. I rebuilt the pump and put it back to service. I no longer get this message. This may not be relevant to your problem but may give you a clue on how to end the CAT TEMP TOO HIGH message. I used to have a tire pressure warning message when starting the car (my sensors are disabled). I managed to put an end to it by using the following procedure: http://www.928.org.uk/resources/75-i...ng-system.html There is certainly a way to end your warning message with a similar procedure. It's matter of finding the box that manages it. Michel 89 S4 ROW Montreal, Canada

09-27-2009, 06:57 PM	#12
mirousse User Join Date: Apr 2008 Location: Québec, Canada Posts: 114	Mike, Pulling the pod is easier than you think. I takes about 10 minutes to get to the circuit board that hold the bulbs. Take this opportunity to change the unserviceable bulbs... Michel 89 S4 ROW Montreal, Canada

09-27-2009, 07:35 PM	#13
Mike B Done With Sidepatch Rennlist Member Join Date: May 2001 Location: Calgary Posts: 3,520	Thanks for the ideas Michel...I would rather not pull the pod...again, but if I have to I will. I already gutted her once __________________ 88 928S4 86 951 928OC member

09-27-2009, 08:32 PM	#14
Garth S Addict Rennlist Member Join Date: Oct 2003 Location: Nova Scotia Posts: 6,483	One can unscrew the gland nuts holding the two thermistors in the CAT's rear end, pull the ~50mm long elements and safety wire them up out of harms way: seal the thermal wells with two caps .... & drive on. I experimented with CAT bypasses on my '88 Japan model, and left both sensors hanging to read ambient temp - never a problem. __________________ '96 993 C4S Midnight blue , Bilstein HD, M030 bars & turbo springs, FPB, SSK, wide ovals w. LPMM, 8"/11" 'hollows', Schnell brace '80 928 Copper brown 5-sp, Konis, euro S springs/brakes, CS wheels, S4 wing '88 928 Euro, Nougat brown, GTS rear, Konis, BBS .... sold ... '90 535i 5-sp black, Bilsteins/Dinan, 3-pc wheels, ..

09-27-2009, 08:38 PM	#15
Mike B Done With Sidepatch Rennlist Member Join Date: May 2001 Location: Calgary Posts: 3,520	Thanks Garth! __________________ 88 928S4 86 951 928OC member