944Hybrids: 924/944/968 and 928 V8 Conversions
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HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Anyone have their Boxster ABS pump in and wired?

+4
87-944S
Lemming
money pit 951
docwyte
8 posters

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  Rich L. Sat Mar 21, 2015 12:47 pm

I don't know, Doc. I found the wire under the dash, where I connected it to the ABS. And I found it outside the firewall, where I connected it to the alternator. I think it goes into the dash and connects through the battery light, the bulb giving it some amount of resistance. The ABS watches it to know when the engine is actually running and not just the ignition is on.

Rich
Rich L.
Rich L.

Posts : 912
Join date : 2011-05-30
Location : Seattle

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  docwyte Sat Mar 21, 2015 1:54 pm

Hmm. Ok, guess I'll give it switched 12v from the alternator then and see what happens. Unless there's a signal wire off the alternator?

docwyte

Posts : 1390
Join date : 2010-07-18

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  docwyte Fri Aug 07, 2015 1:17 pm

To close the loop here, I was finally able to get this working. Several things had to get wired on my car, one was the alternator charge wire, the other was properly bypassing the alarm ECU (which was a PITA to figure out since my car is an '89) and finally was giving the ABS 12v.

It now works! That's the good part. The bad part is since I'm running a hydroboost brake setup you have to be really careful with modulation. If you hammer on the brakes, you can get the ABS to go into Ice Mode" and nothing happens. You literally just don't stop period. You have to ease off the brakes, then back onto them again. Very freaky when it happens on track, let me tell you...

docwyte

Posts : 1390
Join date : 2010-07-18

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  Aneben Thu Nov 11, 2021 8:03 am

Old thread but I give it a shot anyway.

I´m running a LS3 in a 944 turbo -89 with a Holley Terminator X ECU
I have the stock 1 wire PWM triggered alternator that is being controlled from the Terminator X to get 14.2V charge voltage.

My problem is that ABS system don´t work with the warning light constant on. I believe that the cause could be that the B+ signal from the alternator is not connected since there is no B+ on this alternator so the ABS ECU don´t know that the engine is running.
However, how does the ABS ECU know this from the B+ signal? Transition from 0 to 12V?
Since my alternator don´t have B+ I will need to find a way to trigger the ABS ECU to see when engine is started.

Aneben

Posts : 5
Join date : 2021-01-05

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  Rich L. Thu Nov 11, 2021 10:28 am

Hi Aneben.

On my car and on Doc's the alternator provides that trigger to the ABS. This is pin 10 of the ABS connector and pin 2 of the 4-flat connector behind the glovebox, red/black wire.

But on a buddy's race car, he doesn't have an alternator B+ either. So we wired the alternator trigger right in with the ignition switch. This is pin 15 of the ABS connector and pin 3 of the 4-flat connector. The explanation I found on the Bosch website for the trigger being separate from the ignition switch has to do with errors when the ABS doing it's check while the starter motor is cranking. So he keys on the ignition, then waits for the ABS light to go out and after that hits the starter. Works every time!

YMMV... Good luck.
Rich
Rich L.
Rich L.

Posts : 912
Join date : 2011-05-30
Location : Seattle

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Re: Anyone have their Boxster ABS pump in and wired?

Post  Aneben Thu Nov 11, 2021 4:02 pm

Thanks Rich.
I will try that. However since my D+ is unconnected it will get about +12V with ignition. I can also see that on pin 2 on the flat 4-connector when ignition is on so this make me believe that I have a different problem. The ABS was working when I started the V8 conversion 11 month ago.

Aneben

Posts : 5
Join date : 2021-01-05

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Anyone have their Boxster ABS pump in and wired? - Page 3 Empty Found the issue!

Post  Aneben Fri Nov 12, 2021 10:55 am

Found the issue. Smile
Since my car is a RHD and have the battery in the trunk the ABS pump get it´s power from 12V on the starter. I had simply forgot to connect this cable to the starter.

Aneben

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