Abs/psm Faultabd

[villageidiot]

Hi, I have a fault with my 996 C2 year 2000 which is that when I accelerate both the abs and psm warning lights come on at 5000 rpm, it doesn't seem to matter weather you accelerate hard or gently as soon as you hit 5000 rpm they light up. When you stop and remove the key from the ignition and then restart, the lights go out and everything is back to normal.

Apart from this fault the car drives perfectly and has done only 18000 miles, Has anyone ever experienced this fault and if so , what was the cure.

[WARDHOG]

You might want to check your MAF sensor at your intake to see maybe if anything might be lodging up against it. Something could be getting sucked up against it at that engine RPM regardless how fast it takes for the engine to reach it. It can be something small, so check out the air intake box too. While you're at it, clean the air filter. Hope you find the problem.

P.S. Welcome to the board! :welcome:

Edited October 12, 2004 by WARDHOG

[Costa]

You might want to check your MAF sensor at your intake to see maybe if anything might be lodging up against it.

Why would a MAF sensor blockage cause the ABS and the PSM light to illuminate ???

[WARDHOG]

You might want to check your MAF sensor at your intake to see maybe if anything might be lodging up against it.

Why would a MAF sensor blockage cause the ABS and the PSM light to illuminate ???

<{POST_SNAPBACK}>

Good question. One of the the car's safety features is measuring the amount air rushing into the intake verses the MPH. The car thinks it's out of control because the speed is not right compared to the TPS and the MAF sensor. If the MAF has something lodged against it, the engine thinks you are at idle because the MAF sensing wires are shorted. So, that will cause the engine to start to close the throttle body flap to try and slow down the car because remember, the car MPH is still higher than what it should be at idle. So actually, the car thinks it has two problems. The ABS and PSM lights came on because of that because the driver failed to correct the out of control situation by applying the brakes at that precise moment. Does that all make sense to you now. If that doesn't, maybe Toolpants and Loren can explain better. <_<

[bigmds]

:cursing: Got same problem on my 99C4 @ 34000mls, what can I do? How do I open airbox, what do I do when I have?

[RJFabCab]

I can state it no better than Joel Reiser at PCA.

MAF sensors and ABS/PSM faults

Also, check out this thread.

More information

Cheers

Edited December 22, 2004 by RJFabCab

[bigmds]

:cursing: Got same problem on my 99C4 @ 34000mls, autostrasse replaced the sensor in 10mins, all ok,

<{POST_SNAPBACK}>