Hi,

 

I had oil leakage in my old steering rack, 2002 Fabia 1.4.

 

Bought a replacement steering rack, which fit fine, but has 4 wires to the power steering. The old one had 3 wires.

 

Is it possible to make this work somehow, or do I need to find a replacement steering rack?

 

Thanks

Do you mean the power steering angle sensor? Use your original sensor in the new rack.

I have a nasty feeling that you may have bought a Koyo rack, and your original was TRW? Sensing technology of the angle sensor is different I believe, and so it would need a different pump module to go with it.

I have a nasty feeling that you may have bought a Koyo rack, and your original was TRW? Sensing technology of the angle sensor is different I believe, and so it would need a different pump module to go with it.

see if that's the problem how do u go about fixing that , funny feeling that's my issue too

Wino is right that the Koyo rack uses a different style of inductive pick up to sense steering angle, however the TRW system in mine has a 4-wire plug and socket on the pump end but only 3 wires are actually used in the sensor wiring and one pin is left blank.

Apparently the Koyo sensor looks quite different from the TRW one, round like this:

 

Wino is right that the Koyo rack uses a different style of inductive pick up to sense steering angle, however the TRW system in mine has a 4-wire plug and socket on the pump end but only 3 wires are actually used in the sensor wiring and one pin is left blank.

Are you sure you're not looking at the wrong connector? There is a four-way plug on the TRW pump module but it is CAN wires and ignition 12V, the sensor one is 3-way AFAIK.

Apparently the Koyo sensor looks quite different from the TRW one, round like this:

do you need an adapter for it then

Different pump module required to work with that round sensor, I believe.  Dunno about coding a Koyo module into a car that was originally TRW either? May be easy, may not.

i take it if it the the wrong sensor with koyo rack the power steering wouldn't work at all

Different pump module required to work with that round sensor, I believe. Dunno about coding a Koyo module into a car that was originally TRW either? May be easy, may not.

Here's the best pic I can find quickly of a Koyo PAS module with the four-pin angle sensor connector ringed in red.

 

 

Pretty sure that's always a three-way on TRW pumps.

 

i take it if it the the wrong sensor with koyo rack the power steering wouldn't work at all

Different pump module required to work with that round sensor, I believe. Dunno about coding a Koyo module into a car that was originally TRW either? May be easy, may not.

 

The sensors won't physically fit in the rack if they're not the matching type.

Edited 12 August, 20169 yr by Wino

So the power steering wouldn't work then

It will still work in "emergency running mode" even without a sensor there at all. " The steering function remains assured, the greater forces are required for steering."

 

In other words, there's still some assistance, but it doesn't know how fast you're turning the steering wheel any more, so it doesn't know how fast to run the pump to maintain the hydraulic pressure.

So I take it there are 2 different sensors for it

TRW ones look completely different, like the one in this listing. I think early cars may have a captive cable at the sensor end, instead of a plug on the sensor itself as seen here.

Even with the same manufacturer rack the sensors changed from a single hall pick up to a twin. The easiest way externally to see this is if the steering sensor has a built in loom or a seperate one. They are not interchangeable.

Capacitive sensor on TRW systems; Hall on Koyo, according to VW's SSP (Document page 13 for TRW, page 15 for Koyo).  The internals of the TRW sensor may have changed with the change from captive cable to pluggable loom though, for all I know.

Edited 12 August, 20169 yr by Wino

I'm gonna put a couple of Picts up , had car on ramp earlier , not sure how to load Picts

hope its the right things ive taken photo of

The first pic is the cooling fan module.

The first pic is the cooling fan module.

**** sorry , I'll try n get other pict this weekend , 2nd pict any good ?

Capacitive sensor on TRW systems; Hall on Koyo, according to VW's SSP (Document page 13 for TRW, page 15 for Koyo).  The internals of the TRW sensor may have changed with the change from captive cable to pluggable loom though, for all I know.

 

Interesting to read in that article that models with ESP have an angle sensor near the steering column switches and don't have the usual angle sensor in the rack.

dm222 on here has a Seat something-or-other with chronic PAS problems. His has both sensors, which is confusing.

SSPs aren't always entirely error-free in my experience, but that might be a manufacturer-specific variation. 

Do any Mk1 Fabias have ESP?

Do any Mk1 Fabias have ESP?

 

Oh maybe not, I'm not sure.