abs light and psm failure
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Joined: Dec 2012
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From: new york
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abs light and psm failure
I just got a 2002 996tt and had the abs light and psm failure come on put a computer on it and said pressure sensor. is this a pain to change or can I do it myself? any info would help thanks
How many miles are on the car? Any mods? Did the failure just come out of nowhere and it's still running fine, or did the car start acting funny/weird and then the light came on?
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From: In my garage
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I assumed that the fault was ABS/PSM related Fault code 4460:
Pressure sensor
Diagnostic conditions
• Pressure sensor actual value is evaluated and displays an
implausible value
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)
Affected terminals
Terminals 25, 26 and 42
Pressure sensor
Diagnostic conditions
• Pressure sensor actual value is evaluated and displays an
implausible value
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)
Affected terminals
Terminals 25, 26 and 42
Registered User
Joined: Dec 2011
Posts: 1,512
From: Illinois
Rep Power: 132
I'm having this same trouble since I bought my car. They both go of when I'm in full boost for an extended period of time. Is that how yours comes on? Not sure what I need to do.
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Joined: Mar 2008
Posts: 2,807
From: Montreal Canada
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Would be nice to have the exact code ...Pete answer is more plausible but I know the pressure sensor inside the abs unit cannot be replaced....
Last edited by jpflip; Dec 25, 2012 at 07:27 AM.
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From: new york
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It comes on more often now but has nothing to do with speed and the battery. I say this because battery is new It comes in sometimes when I start it and touch the break peddle. The brakes feel like anti locks are kicking In and I'm barely touching the peddle.
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Joined: Mar 2011
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From: Australia
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try insulating the wiring loom that runs to the maf I had the psm abs problems for two years I tried everything to fix it. I finally figured out the loom needed insulation from my metal 3" y pipe. all i did was wrap the loom in some plastic wiring insulation and have the top of the maf turned around so the wiring faces fwd. PM me for pics if your interested in trying this solution.
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Joined: Mar 2011
Posts: 107
From: Orange County CA
Rep Power: 33
My 2003 had same problem with the same fault readout. Problem got progressively worse over time (PSM intervening more and more when not needed). Turned out to be a failing break pedal (stop light) switch. I only found out when my brake lights finally stopped working. Installed new switch (about $24) and it solved everything.
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I heard about this was goimg to look into that did your breaks feel like the anti lock was kicking in ? and is it a easy do it yourself fix ? im handy just never worked on cars much
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Joined: Mar 2011
Posts: 107
From: Orange County CA
Rep Power: 33
Simple to replace
Yes, the stability management system uses the abs system and it feels as if abs is activated, sometimes on a single wheel, when it is not needed. It is simple to replace, the part actually snaps into place. Good luck.