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911rs

ABS PSM Fault code 4460

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Hi , i took the switch from 2 cars  (996tt and 997tt) without abs / psm problems , the problem is still there. If there is a way to check the pressure of an activated pre brake pump?

 

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11 minutes ago, b-tuning said:

Hi , i took the switch from 2 cars  (996tt and 997tt) without abs / psm problems , the problem is still there. If there is a way to check the pressure of an activated pre brake pump?

 

 

 

Fault code 4460 -- Pressure sensor

Possible cause of fault

- Short circuit to ground/voltage or open circuit in circuit to control module terminals 25, 26 and 42

- Plug connection on stop light switch faulty

- Adjustment of the stop light switch not OK

- Wiring/ plug connection faulty

- Pressure sensor faulty (replace hydraulic unit)

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Quote

 

 

Hi Guys, i have the same fault code 4460 on my 2002 996 turbo . I allready check the wirings by using the porsche droubleshooting > everything ok

 

Brake sistem purged convencionally (RR,RL,FL,FR) with piwis
changed ABS unit 2x new /with PIWIS purged & programmed > and changed the brakepressuresensor extra
But still get the same" Fault code 4460 "

brakelight switch / new and addjusted

pre brake pumpe under the headunit also new and purged F.R with piwis

has someone have this issue before?

 

As soon as i accelerate above the light pops up without standing on the brake padel

 

Thnx in advance best reguards from Germany

 

benjamin

 

 

Benjamin,

 

If your fault is like mine, every time the car exceeds approximately 30 mph for the 1st time following start, the 4460 error is set.  I've read somewhere that the car does a diagnostic test at 30 mph or so.  I'm not sure what this diagnostic is testing -- haven't been able to identify.
 

John

 

Update -- My problem was my brake master cylinder.  You have to use the stock MC if you want the ABS/ PSM to work.  Somehow, the OEM internals are special.  I used a 997 MC that was operationally equivalent, but the PSM/ ABS hated it.  Once I switched back to a (new) stock MC, the problem was gone.

 

Edited by jpurban
Adjusted content

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I just have now this error 4460 and I wonder if .. Purging brakes without using a PIWIS ..could be one of the causes (beside the ones listed above) ?

In my case, this is a (2001) 986, on which I have a Brembo big brake kit in the front (large rotors with 6 pistons calipers) since about two years.

I never was real 100% happy with the brake pedal feel, and this .."for ever" with any 986 or 996 (more than 15 years of these).

Since about two month, I changed on my Boxster the Master Cylinder, OEM to TRW  PMN166 (Turbo type).

Btw, for your info, since this change, I would say that the brake pedal feel is absolutely fantastic. I feel that now, this is the "perfect brakes" !

But from some days, I have intermittent  ABS and PSM lights together on on dash board. Looking at the error code (Durametric), this is the "sensor error" code 4460.

 

My very first question about the error cause is could it be "improper purging" ?

I read (very recently) that if you do a "complete purge" (i.e.: new master cylinder), than if the car has PSM (mine has it), then the complete purging process require a PIWIS, in order to open the PSM valves in order to purge correctly,

Could this be the cause of "4460" ???

Thanks a lot in advance

 

Edited by gva-sfo

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48 minutes ago, gva-sfo said:

I just have now this error 4460 and I wonder if .. Purging brakes without using a PIWIS ..could be one of the causes (beside the ones listed above) ?

In my case, this is a (2001) 986, on which I have a Brembo big brake kit in the front (large rotors with 6 pistons calipers) since about two years.

I never was real 100% happy with the brake pedal feel, and this .."for ever" with any 986 or 996 (more than 15 years of these).

Since about two month, I changed on my Boxster the Master Cylinder, OEM to TRW  PMN166 (Turbo type).

Btw, for your info, since this change, I would say that the brake pedal feel is absolutely fantastic. I feel that now, this is the "perfect brakes" !

But from some days, I have intermittent  ABS and PSM lights together on on dash board. Looking at the error code (Durametric), this is the "sensor error" code 4460.

 

My very first question about the error cause is could it be "improper purging" ?

I read (very recently) that if you do a "complete purge" (i.e.: new master cylinder), than if the car has PSM (mine has it), then the complete purging process require a PIWIS, in order to open the PSM valves in order to purge correctly,

Could this be the cause of "4460" ???

Thanks a lot in advance

 

 

Welcome to RennTech :welcomeani:

 

I seriously doubt it, but as it would be your labor only it would be worth a try to see if it corrects the issue.  You can also do this with the Durametric system.

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Thanks for FAST answer and also for the Welcome !

(..I was kind of a "dormant" person !)

 

Interesting comment !  (..I like it).

Taking your doubt in account (for good), I will step in with the list above.

Will report findings.. 

:)

Thanks a lot  

Edited by gva-sfo

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2 hours ago, Steven Biggerstaff said:

Hi, l am having the exact same issue as George Katsiaris with a 996 targa.

Do you source the fault and if so what was it?

Thanks


Steven 

Welcome to RennTech :welcomeani:

As noted above:

 

Fault code 4460 -- Pressure sensor

Possible cause of fault

- Short circuit to ground/voltage or open circuit in circuit to control module terminals 25, 26 and 42

- Plug connection on stop light switch faulty

- Adjustment of the stop light switch not OK

- Wiring/ plug connection faulty

- Pressure sensor faulty (replace hydraulic unit)

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