Byron in MS

I know this issue gets beat to death but but I cannot seem to resolve my issue with over a year of dealing with it!!! Last year I converted my car to rear wheel drive. After that I would get the dreaded PSM/ABS failure whenever I would get a little spirited in my driving. Track days were the worst obviously. So I would disconnect the PSM pump in the front trunk. This would at least allow the ABS to continue to work. At first I thought this issue was a result of removing the front running gear and thought the ECU needed reflashing since the error said something like "Signal improbable".

After a few weeks, it started throwing the P0102 code, so last March I replaced the MAF. I thought this had fixed the PSM/ABS Failure issue, but upon the next track day, it reappeared.

So now I got the car back after 6 months of front end conversion and it will barely run with the MAF connected. I have been disconnecting the MAF to drive the car, and it runs great, but the PSM/ABS Failure and P0102 occur instantly.

So I got a Durametric tool and connected it and have attached a sample log. The MAF seems to be working based on what I have read online, but it runs terribly. It spits, sputters, and searches for an idle speed. When revved, it is not smooth, and won't hold a steady RPM. Disconnect the MAF and it runs fine, but the PSM and ABS shut down and the CEL comes on.

Kevin

You wrote the diagnosics and solution in your post..

You unplugged the MAF and the engine ran better and idled....

You have a damaged MAF from the bodyshop or accident or XYZ.. Replace it.

Byron in MS

If the MAF were damaged, shouldn't the log reflect that? This log shows viable readings for a good MAF... IF MAF's were $10, it'd be different.

Kevin

When the MAF is unplugged the ECU is now being forced to run on the MAP sensor> speed density..

Your MAF or wiring harness/connector is faulty.

Macster

There is I believe no need to further diagnose what Kevin has I believe correctly id'd as a MAF (or MAF wiring) problem.

But if you want monitor/log short term fuel trims. Those are derived from the signal the MAF sends to the DME. Also, check the intake air temperature. This is another MAF supplied reading.

Fishey

You could have a vac leak as well

rmc1148

Unless your going maffles as suggested at 6spd a spare MAF is nice to have= so give it a try and if it isn't that you have it for when.