I have been searching how to deactivate PSM and have found several threads on how to. But, short of a major retrofit from GT or other, has anyone found a way to deactivate PSM without a light? Maybe unplugging precharge pump and install a resistor in it's place to trick it into thinking the motor is still there??

If I am missing a thread that already covers this ,i would appreciate a link.

 

Wouldn't it be great if someone could wire the pump plug to the PSM switch, so you are completely disconnecting the pump when you turn off the switch? At that point, I would just remove the PSM error bulb.

Later, Steve

 

What is the reason for wanting the light to be off? Sounds like a lot of work.

 

To remove distraction so that I see the lights I care about. And until their is a solution to the PSM deactivation without lights, we really don't know how much work it is.

 

i cant stand those orange lights. seems like nothing good is ever happening when i see em. quick and tacky solution might be that someone once suggested a small circular piece of elec tape.

i too vote for a toggle that would actually turn it fully off and deactivating that pump is on my never ending to do list.

 

what's PSM?
John/Pwdrhound did this, IIRC solution is a GT2 cluster...

 

No easy way to do it. We looked at it long and hard. The PSM logic is in the instrument cluster. You can remove the orange bulb from the cluster but you will still have the nuisance "PSM failure drive to workshop" message that will still pop up every 30 minutes and you will have to repeatedly clear it with the stalk. You can't put a resistor in there because the cluster needs to "know" that the pump (or some other part of the PSM system) has failed in order to completely shut PSM off and cease any PSM output commands. Otherwise, the cluster would still command engine throttle retard, etc...

Maybe some computer programmer nerd could jail brake the cluster and delete the PSM programming but I don't know of one. We have a guy that does a lot of the cluster programming for us like mileage but he can't crack the code.

The only way to do it is to install a GT2 cluster along with a GT2 fuel tank if you want a functioning fuel gauge. The GT2 cluster does not have any PSM logic. That's what I did along with removing the PSM pump and yaw sensor. When you do that you will need to install a GT2 brake fluid reservoir. Basically you replace all the TT stuff with GT2 stuff.

 

Maybe another hack is possible, rather than cracking into the dash ecu? How many wires on the plug to the PSM pump?

 

That was my thought. If the cluster only registers the pre charge pump motor resistance to determine it is functional and in turn turn the light off, then a resistor would turn that light off if unplugged. Unless someone has already tried and failed at this?

 

If anyone has access to the code I can take a look at it...

 

I think there is still a basic misunderstanding of how the PSM system works and integrates with the car. Again, the dash HAS to know that some part of the PSM system is NOT working so that it COMPLETELY shuts off all PSM outputs as that is the default mode. Only then is PSM fully OFF. If you fool it into thinking the PSM pump is operational (so that the light stays off), it will continue with PSM outputs which will still retard throttle under certain conditions as part of its PSM logic.

Getting rid of the light is easy (simply remove the bulb), but getting rid of the annoying ding and recurring PSM failure message that will keep popping up in the central dash display is not unless you jailbreak the cluster and reprogram it.

 

So when you unplug the pump you get the failure light and reoccurring failures? However when you turn off the PSM you just get the light. So if you setup the switch so that it defaulted to PSM off and disconnected the pump and replaced with a resistor the warning would pop on still? Would it just happen when the unsafe conditions that would cause the PSM to intervene while off would occur? Or is it also looking at the sensor under the seat?

 

Correct. When you unplug the pump you get the orange PSM warning light AND you get the "PSM failure" message that pops up in the central display in the instrument cluster. You can clear this with the stalk but the message WILL continuously pop up every 30 minutes along with a warning ding. You will then have to clear it again. This occurs whenever any part of the PSM system is detected as faulty, for example a faulty (disconnected PSM pump), a bad yaw angle sensor, etc.. When ever any part of the system is detected as faulty, the instrument cluster COMPLETELY shuts off all PSM outputs which effective 100% shuts off PSM.

Keep in mind that PSM off via the dash button does not really turn PSM fully off but simply dumbs it down. As soon as brakes are engaged, PSM will intervene. This is counter productive as you want PSM off under heavy trail braking so you can rotate the car.

There is more to PSM than just engaging the rear brakes (via the PSM pump). PSM also retards throttle and pulses front brakes as part of the PSM equation. As a result, if you want PSM 100% OFF, you must have all PSM outputs shut off and the only way that happens is when the cluster sees some part of the PSM system as faulty. Unfortunately the by product of that is the orange light AND the recurring msg in the central display. Hope that makes sense.

 

though its often difficult for an average driver such as myself to discern the difference, i'm pretty sure its the "pulsing" that drives me nuts and is disconcerting as hell. t's hard to isolate which one is predominant though as they operate in concert with one another. so its really the abs stabbing? though it seems and it appears you're saying, that it really is both. either way, it can be a real intrusive ( when it isn't life saving ) nuisance.

 

I may have misspoken as PSM can NOT engage the front brakes but it can engage (pulse)ABS independently on the front in concert with pulsing the rear brakes in order to keep the car in check when and if yaw becomes excessive. It can also retard throttle as part of the equation.

Even on the later gen cars PSM Is very intrusive. I recently had a chance to turn some hot laps in a 991GT3 and it wasn't until everything was fully turned off that you could push the car beyond 8/10s or so without the nannies kicking in excessively. Luckily on that car when you shut it off with the dash button, everything is 100% off with only ABS remaining.