abs ecu

[DavidL]

I've picked up a new abs ecu to see if that is where my problem lies.
Now I have part no 928 618 119 05 which it seems are all those for sale on ebay.
However PET gives 928 618 118 00.

New part Bosch no is 0 265 103 035

I cant find any mention of the part no I have on PET nor the PET no elsewhere. So are they the same?


ETA I may have answered this. From Rennlist

968 ABS control Unit, Part number 928 618 118 00

the 944 turbo ABS control unit, Part Number 928 618 119 05 does not have a speedo output.

But why would PET have a 968 part on the 944 page?

 

[TTM]

The 968 control unit is the updated part for the 944, whence it's now listed in the 944 section.
You would have to find an old version of PET to see the part number of the original unit appear on the sketches.

By the way the 968 ABS control unit is one of the various parts needed when installing a 968 gearbox on a 944, in order to get the speed information to the speedo (after modifying the wiring to the speedo, it's not plug & play).

 

[chrisg]

David

i know it's stating the obvious, but when I fixed the ABS on my Turbo (the ECU was fried..) I simply pulled the old one out and sourced a direct match/replacement with the same Porsche and Bosch part numbers.

Again very obvious, but if it is the ECU it's a very straight forward swap (drivers footwell under the carpet) to change it - easy to test on the road as well on ramps or axle stands,

Hope you get it fixed,

Chris

 

[DavidL]

I think I have the right bit. I'll have a go on Sunday - I need the drivers seat out to give it a damn good clean as the garage have left it a bit grubby so that will make it a bit easier.
Presumably all the carpets come out ok - nothing stuck solid?

 

[chrisg]

Absolutely - the carpet in the drivers footwell where the ABS ecu is located should be on velcro so it's easy to get at.

Ref. removing the drivers seat - you've 6 x 6mm allen key drive bolts two a the front and four at the back holding the seat in - you need to slide the seat forward/backwards to get at them all.

Don't forget to unplug the wiring connector/loom to the underneath of the seat - even if it's a manual adjuster there should still be the seat sensor connector.

Yours

Chris

 

[DavidL]

Cheers Chris.
I've had the seats out before - still have the old set sat in the study waiting cleaning and selling. As you say that is quite straight forward.
I had a brief poke at the carpets and they would seem to be loose enough.
I'll let you know how it goes.

 

[DavidL]

Well no joy. Swopped the ECU (same part no in and out) and still permanent exclamation and antilock lights on the dash.
To date the relay has been checked, new wheel sensors fitted, replacement ECU and the light remains on permanently. And no ABS operation as far as I can see, or feel.
So where next? People talk about hearing the pump run and I don't think I can hear anything - should it sound a bit like the turbo cooling pump only when the engine is first switched on?
Also managed to clean and condition my seats which look much better!

 

[bertelli_1]

I assume you reconnected the earth wires on the wiring loom (next to the ecu). It may be time to check the continuity of the wiring, to the ecu and pump. A wiring diagram will make your life easier.

 

[chrisg]

David

I know you may have checked all these but...

The ABS system on the 944 is wiring -wise is quite complicated with a number of junctions/ connectors both at the front and the rear - these are the creamy white plastic barrels held in place by black clips - the same connector blocks are also used for the brake wear sensors.

Anyhow, a number of these have earth feeds into them, often these are corroded or snapped off ? Also worth checking if all the wires are pushed in properly.

The ABS system on the 944's is actually pretty straightforward (apologies for stating the obvious..):

Sensors
Wiring and harness
ECU
Pump
Relay

Having changed the sensors, ECU and I think you said relay my guess would be the pump ?

The dashboard light would indicate to me that it's a sensor/ plug or easily fixable issue. When my ABS failed, the pump failed then fried the ECU - no warning lights or anything, just no ABS !

Hope you get it fixed !

 

[DavidL]

Cheers Chris.
I need to do just that and get the wheels off and have a good look around.

 

[Dockrell]

David,
I have just had my ABS problem fixed by my local independant dealer.
The symptoms were that the warning lights came on once the car started moving, and based on information in this forum seemed like the speed sensors could be the problem.

I managed to source a working pump, working abs ecu and new speed sensor via the Web.

Problem turned out to be the pump motor - siezed solid.

The pump sits in a hostile environment under the nearside wheel arch - as we drive on the left. The pump is alloy and suffers a lot from corrosion.

You can get pumps on the Web but I think it would be better to actually see any you buy - the pictures on the Web don't always show the corrosion.

Mike

White 2.7 automatic

 

[944Turbo]

I thought the pump was under the offside ?!? though it would make sense for it to be near the master cylinder

 

[DavidL]

Can you actually hear the pump? I'm not sure I can which may explain things!

 

[944Turbo]

when you pull away yes, and when its working, though thinking about it, not sure I have on my cab better check it works

 

[chrisg]

Just to clarify, the ABS pump sits up against the A pillar under the Driver's or Off-side wing. The ABS ECU is located inside the car in the driver's footwell agains the a-pillar. The multi-point harness connects directly between the Pump and ECU through the inner wing.

As far as I'm aware (and happy to be corrected) the 'drive' of the car left or right hand has no effect on either the brake master cylinder or ABS location. For LHD cars the brake pedal actuates the master cylinder directly as opposed to via a bar under the dashboard. On LHD cars there is no separate Clutch reservoir as this is fed by the brake master reservoir (hence the small 'sealed' tab on RHD cars)

Anyhow, back to the ABS issue, David I suggest you get the car in the air on 4 x axle stands and have a good poke around with the wiring and speed sensors. You may find that one or more are either loose or unplugged. In particular, I would check the various earth points that go between the chassis and the ABS wiring loom into the cylindrical white (with a black chassis clip) junction boxes. At the front these are earthed on the Front struts. At the back there's chassis earths up on the underside of the car hidden behind the gearbox. These get VERY rusty and can corrode away - could be something as simple as a broken earth strap ?

I'm no expert on ABS but without a speed sensor signal to ECU from all four wheels, I suspect the ABS pump won't be live or activated ?

Good luck !

 

[chrisg]

I realised after reading my second post that I'd repeated myself.... Must be an age thing so apologies.

I think this repeat ref. the earth wires was prompted by the amount of rust/shit that dropped in my eyes and hair last night whilst I was eagerly removing the ABS wiring and sensors from the rear end of the S2 that I'm scrapping !