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Bumping this thread. I've been running "option 2" but I'm looking for a better solution, one which doesn't result in what I call "over active ABS syndrome" my ABS triggers far too easily and often.
Has anyone tried wiring a switch to the yaw sensor or the PSM computer? Any write ups?
Thanks!
I have a switch on the pump wiring (GND, IIRC). Switch is located inside the cabin. Switch set to OFF, PSM will be permanently off until car is restarted with switch set to ON. There will be a warning on instrument cluster, which can be removed with OBC stalk, but it will reappear after 15-20 minutes drive and can again be removed. Just nuisance, one will get used to it.
ABS stays on all the time.
Write up? No, but I cut the wire close to PSM unit, soldered extension wires (used shrinkable sleeve w/glue over solders and sleeve over wires) and pulled them to cabin through grommets. Switch is partially hidden under the dash (I have ClubSport center console delete) with HI/LO boost switch. Both switches UP = street boost and PSM on, DN= track boost and PSM off. =D
And just to confirm, your ABS still works as it should?
Has anyone tried cutting/adding a switch to the brake input going to the PSM unit. On newer cars there are two brake switches, one for the lights and one for PSM, disconnect the one to the PSM and it never knows that you're trail braking and PSM stays truly off.
-Dino
Originally Posted by pete95zhn
I have a switch on the pump wiring (GND, IIRC). Switch is located inside the cabin. Switch set to OFF, PSM will be permanently off until car is restarted with switch set to ON. There will be a warning on instrument cluster, which can be removed with OBC stalk, but it will reappear after 15-20 minutes drive and can again be removed. Just nuisance, one will get used to it.
ABS stays on all the time.
Write up? No, but I cut the wire close to PSM unit, soldered extension wires (used shrinkable sleeve w/glue over solders and sleeve over wires) and pulled them to cabin through grommets. Switch is partially hidden under the dash (I have ClubSport center console delete) with HI/LO boost switch. Both switches UP = street boost and PSM on, DN= track boost and PSM off. =D
I recently did an LS swap on my 2002 996 and since then the PSM and ABS lights have been on.
I got a Durametric and found I had code 5525 "Incorrect data transfer with DME master control unit" which isn't too surprising since the DME has about 12 fault codes related to the engine missing.
With just this code it seemed like the ABS wasn't working, though I wasn't able to confirm that.
I tried disconnecting the yaw sensor in the center console. That gave the PSM two additional error codes, but the ABS definitely works.
I ended up plunging the yaw sensor back in, but I don't think the codes cleared, since ABS still seems to work.
My next steps are to check the codes again, clear the additional codes if they are there (5525 can't be cleared). Then I will confirm for sure whether the ABS works.
I wanted to share, because if my hunch is correct, disabling the yaw sensor can't be done with a switch on the 996. Since you would have to clear the codes before everything goes back to normal.
I'm really looking for a way to disable PSM, but have ABS work and the ABS light go out. If the PSM light could go away too, that would be ideal.
Has anyone swapped the whole ABS system from a non PSM car before? Might be too much work.
With PSM disabled using the dash switch and you’re NOT on the brake pedal, no intervention, period. You can spin the car 360 degrees, do on throttle drifts, pitch it sideways and whatever you want, and it wouldn’t do anything unless you touch the brake pedal in which case it’s fully and completely active until you let go of the brake pedal and/or the car is no longer under a condition that triggers PSM intervention
I am still new to this P car owners group. Last week after a light rain and an empty parking lot I decided to play with PSM on and off. I thought the C4S would still track pretty straight. After a few 180s and a 270 spin I realized it was fun but I like PSM. It keeps an old man with slower reflexes out of the weeds.
I recently did an LS swap on my 2002 996 and since then the PSM and ABS lights have been on.
I got a Durametric and found I had code 5525 "Incorrect data transfer with DME master control unit" which isn't too surprising since the DME has about 12 fault codes related to the engine missing.
With just this code it seemed like the ABS wasn't working, though I wasn't able to confirm that.
I tried disconnecting the yaw sensor in the center console. That gave the PSM two additional error codes, but the ABS definitely works.
I ended up plunging the yaw sensor back in, but I don't think the codes cleared, since ABS still seems to work.
My next steps are to check the codes again, clear the additional codes if they are there (5525 can't be cleared). Then I will confirm for sure whether the ABS works.
I wanted to share, because if my hunch is correct, disabling the yaw sensor can't be done with a switch on the 996. Since you would have to clear the codes before everything goes back to normal.
I'm really looking for a way to disable PSM, but have ABS work and the ABS light go out. If the PSM light could go away too, that would be ideal.
Has anyone swapped the whole ABS system from a non PSM car before? Might be too much work.
5525 lits when MAF is bad or disconnected, ie there's no torque data passed to PSM computer from the Motronic. Most likely you will not get rid of it (b/c the conversion), but completely disconnecting PSM's electrics plug you'll only get the warning I mentioned in my previous post and your ABS will work.
Changing the complete ABS/PSM unit to bare ABS is possible, but in order not to get any ABS/PSM related warnings you'd also need to change your instrument cluster to one matching the ABS unit.
'02 car has CANbus, so that leaves only few options on the table, GT2 and GT3. Both cars have CANbus but no PSM. BUT different Motronic and engine. Motronic may not have here any effect at all, but with that engine/instrument cluster combination you'd loose at least oil level measurement (if applicable with your conversion). If your car is C4 (or C4S), then your fuel level measurement system would be similar to new cluster's and would still work.
5525 lits when MAF is bad or disconnected, ie there's no torque data passed to PSM computer from the Motronic. Most likely you will not get rid of it (b/c the conversion), but completely disconnecting PSM's electrics plug you'll only get the warning I mentioned in my previous post and your ABS will work.
Changing the complete ABS/PSM unit to bare ABS is possible, but in order not to get any ABS/PSM related warnings you'd also need to change your instrument cluster to one matching the ABS unit.
'02 car has CANbus, so that leaves only few options on the table, GT2 and GT3. Both cars have CANbus but no PSM. BUT different Motronic and engine. Motronic may not have here any effect at all, but with that engine/instrument cluster combination you'd loose at least oil level measurement (if applicable with your conversion). If your car is C4 (or C4S), then your fuel level measurement system would be similar to new cluster's and would still work.
Complicated? Yes. BTDT
I confirmed that the codes from unplugging the yaw sensor don't clear when you plug it back it.
But I was wrong about 5525. I confirmed ABS does work with only that code.
You are saying on a 2002 C2, if I unplug the PSM module, the ABS will still work, the ABS light will go off, but the PSM light will stay on?
I should definitely try that. Thanks for your insight!
At PCASDR's performance driving school, I drifted the entire circumference of the skidpad during the throttle steering exercise. It was no 2,000HP Supra drift, but it was drifty enough that folks were applauding and taking video.
When I first got the 996, I was bound and determined to get rid of PSM because it was firing off constantly. After moving from 19's with rubber band wheels to 18's and adjusting the coilovers a bit, PSM seldom interferes, and my urge to tear out the ABS pump has subsided.
At PCASDR's performance driving school, I drifted the entire circumference of the skidpad during the throttle steering exercise. It was no 2,000HP Supra drift, but it was drifty enough that folks were applauding and taking video.
When I first got the 996, I was bound and determined to get rid of PSM because it was firing off constantly. After moving from 19's with rubber band wheels to 18's and adjusting the coilovers a bit, PSM seldom interferes, and my urge to tear out the ABS pump has subsided.
Interesting, I didn't know this would impact the system in that way.
how did how did changing wheels and suspension do that for you? What wheels and tires did you settle on?
So has anyone tried pulling fuse? According to the fuse box diagram both Fuse 8 and Fuse 10 on Row C are related to PSM, I wonder which one (or both) should I pull?
Easy enough for me - disconnect the electrical connector to this pump. PSM will be disabled and ABS will continue to function.
For a track car I would highly recommend disabling PSM, the switch in the cabin does not fully disable in my 03 - this is verified with data confirming PSM activating brake application while on throttle with the switch in the off position.
Easy enough for me - disconnect the electrical connector to this pump. PSM will be disabled and ABS will continue to function.
For a track car I would highly recommend disabling PSM, the switch in the cabin does not fully disable in my 03 - this is verified with data confirming PSM activating brake application while on throttle with the switch in the off position.
does this apply to 997? This is in the trunk with the liner removed?
11-13-2017, 06:06 AM
