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911rs

ABS PSM Fault code 4460

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Hi all,

after changing the steel brakelines (few weeks after)

996 TT mod04 has ABS PSM light on.already checked:

brakelight switch / new

MAF new

MAF lines to ECU checked

Brake sistem purged convencionally (RR,RL,FL,FR)

ABS unit new /with PIWIS purged & programmed

But still get the same" Fault code 4460 "

has someone have this issue before?

Thnx in advance

911rs

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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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Loren,

thanks for your fast reply. I cheaked allready all of this as you wrote. But still have problem with the same code :(

Could the steel brake lines couse this problem?

BR

911rs

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Hi Loren,

The PSM pump was faulty.The problem is fixed wink.gif

Thnx again for your ideas / PM's.cool.gif

Best regards

911rs

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Twinturbofan and chappcc,

Did you check these probable causes?

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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Twinturbofan and chappcc,

Did you check these probable causes?

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)

I've followed the troubleshooting guide for the pressure sensor connector and found pin 3 on the wiring harness connector, which should read 0v, shows 5v. This indicates a short some where in the wiring. My Porsche dealer said the ABS/ PSM hydraulic unit is bad although the fault is in the wiring harness. This seems inconsistent with the fault in the connector. Any thoughts on how to trouble shoot this further.

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Twinturbofan and chappcc,

Did you check these probable causes?

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)

I've followed the troubleshooting guide for the pressure sensor connector and found pin 3 on the wiring harness connector, which should read 0v, shows 5v. This indicates a short some where in the wiring. My Porsche dealer said the ABS/ PSM hydraulic unit is bad although the fault is in the wiring harness. This seems inconsistent with the fault in the connector. Any thoughts on how to trouble shoot this further.

I need to correct this. At step 4 of the attached, I get 5v from pin 2. I need help with my next step.

http://www.6speedonline.com/forums/attachment.php?attachmentid=138835&d=1291474983

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Short circuit to voltage between pin 2 of booster pump pressure sensor plug and PSM control module plug pin 26 → End.

If you can not find a wiring connector issue then you will likely need to replace the hydraulic unit.

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Short circuit to voltage between pin 2 of booster pump pressure sensor plug and PSM control module plug pin 26 → End.

If you can not find a wiring connector issue then you will likely need to replace the hydraulic unit.

Thanks - how can I find which hydraulic units will fit mycar. I have a 2000 C4 (Millenium Edition) with a hydraulic unit part number of 996.355.755.47

Dealer says 996.355.755.61 is the replacement but also will need a new sensor and mounting brackets. I am consider a used part to avoid the several thousand dollar repair at the dealer There are plenty on ebay and only a few for C4

Edited by chappcc

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You could use -47, or -53, or -55, or -61.

All will still require Durametric or Porsche PST2 or PIWIS tester for specialized bleeding of the new (or used) unit.

Ok - I've reviewed the tutorial by KS- CS as http://www.planet-9.com/reviews/electronics/p384-durametric-tutorial-part-2-3a-advanced-functions.html and the procedure requires the Durametrics version 2 cable. I've got version 1 purchased in 2006, so I will upgrade when I find the proper hydrolyic unit. I use a Motive pressure bleeder so I should be in good shape. Thanks for your help.

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Loren,Can you also PM me the troubleshooting steps for ABS PSM fault code 4660? I have the same problem.Thanks,Chappcc

I also have the same problem, can I get a copy of the TS procedures?

Thanks

Dan

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Loren,Can you also PM me the troubleshooting steps for ABS PSM fault code 4660? I have the same problem.Thanks,Chappcc

I also have the same problem, can I get a copy of the TS procedures?

Thanks

Dan

Umm... that is something we do for "Contributing Members" only.

Please consider a donation to cost of operating this site.

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I have this same code, I have changed and checked the brake pedal switch several times. Finally gave up and took it to a local specialist who told me it is the pressure sensor or switch on the ABS controller. He told me he has replaced the sensor a couple of times in the past, but is now unable to locate the part number. Is there such a part, or do I need to replace the whole PSM ABS unit? If so, what is the correct part number for a 2001 C2?

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Hi Loren thank you for helping for my cayenne head light issue .

Now having problem with my millennium 996 can you send me TS for 4460 code my Mecanic want to change the pump.

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Hi Loren thank you for helping for my cayenne head light issue .

Now having problem with my millennium 996 can you send me TS for 4460 code my Mecanic want to change the pump.

 

I sent you a PM.

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Hi Loren

 

i am facing the same issue with fault code 4460. Carried out all tests and even sent the pump for repair where they found a faulty circuit board and the pressure sensor. Replaced brake light switch, MAF sensor, Steering angle sensor. I replaced these components because i wasn't getting any values from them with the tester. Now with the pump repair i get the readings from these sensors but on the test drive the fault comes up again, 4460 Pressure sensor. BUT when i test drive the car and i accelerate very gently the fault doesn't come up. As soon as i accelerate above 3k rpm the light pops up. Any ideas? 

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3 hours ago, George Katsiaris said:

Hi Loren

 

i am facing the same issue with fault code 4460. Carried out all tests and even sent the pump for repair where they found a faulty circuit board and the pressure sensor. Replaced brake light switch, MAF sensor, Steering angle sensor. I replaced these components because i wasn't getting any values from them with the tester. Now with the pump repair i get the readings from these sensors but on the test drive the fault comes up again, 4460 Pressure sensor. BUT when i test drive the car and i accelerate very gently the fault doesn't come up. As soon as i accelerate above 3k rpm the light pops up. Any ideas? 

 

Exact model and year of your car please?

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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

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The root cause of mine was the brake light switch. It took a long time to identify this as I got 2 bad new replacement switches. The 3rd replacement switch fixed the issue.

 

I also ended up replacing the switch on the ABS unit and a few other parts before identifying it to be a succession of bad switches.

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