ASC and Engine Warning Lamps ON

[Cooper Man]

Hi all, I'm looking for some pointers (other than to the dealer!) as to the likely cause of my car's problem

I hit a pothole in the road yesterday; immediately, the ASC lamp came on, and stayed on. No amount of flicking the switch would turn the system back on again.
Performance was not affected, but there was quite a bit of yo-yoing when lifting off of the accelerator.

Shortly after, the Engine warning lamp came on: the manual states this relates to a deterioration of exhaust emissions.

I used the car later on; this time the ASC light had gone out, BUT, both lamps remained lit today!

So my questions are...

1. Why should the ASC be affected after hitting a hole/bump in the road?
2. Why should the ASC affect the engine emissions?
3. Do I really need to head for a dealer?

Any help or suggestions would be welcome.

[MINIMANIAUK]

1 the wheel speed sensor was fubar when hitting the pot hole
2 the asc is connected to the engine control unit and could have sent some odd signal by being fubar
3 certainly help in finding which sensor is fubar ,then again the cost of them locating which one would be more than the price of a new sensor and its only 50/50 choice

[Cooper Man]

Quote: Originally Posted by MINIMANIAUK (original)

1 the wheel speed sensor was fubar when hitting the pot hole
2 the asc is connected to the engine control unit and could have sent some odd signal by being fubar
3 certainly help in finding which sensor is fubar ,then again the cost of them locating which one would be more than the price of a new sensor and its only 50/50 choice

Thanks for the reply Minimaniauk.
Are the sensors BMW supply only, or do well-stocked car stores in Ampthill have any to sell at all?

[oldmots]

Quote: Originally Posted by Cooper Man (original)

Thanks for the reply Minimaniauk.
Are the sensors BMW supply only, or do well-stocked car stores in Ampthill have any to sell at all?

ABS sensors are usually dealer-only or specialty parts and fairly expensive. If you have warranty, take it to the dealer.

[cristo]

ABS sensors - part #34526756384, about $70 US at dealer.

[Cooper Man]

Quote: Originally Posted by oldmots (original)

ABS sensors are usually dealer-only or specialty parts and fairly expensive. If you have warranty, take it to the dealer.

Quote: Originally Posted by cristo (original)

ABS sensors - part #34526756384, about $70 US at dealer.

Thanks for the info guys.
Unfortunately, the warranty has expired - I bought the car almost 4 years to the day, but after 116,500 miles of practically trouble-free motoring, I don't suppose I can complain too much

[Cooper Man]

Has anyone bought an ELM 323 OBD II unit at all?
I received mine today, but the CD supplied cannot be read by my laptop or PC. I have found the software online, but I still need the drivers?

Is anyone willing to email them to me?

[Cooper Man]

Quote: Originally Posted by Cooper Man (original)

Is anyone willing to email them to me?

Problem solved; I found a USB/Serial port converter that did the trick.

[Cooper Man]

Warning lights illuminated are: "ASC+T", along with the "Check Engine"

Output from the OBDII Scantool is:

P0108 High Manifold Absolute Pressure

Absolute Throttle Position = 3.5%
Engine RPM = 756 rpm
Timing Advance (Cyl #1) = -1.5 degrees

Intake Manifold Pressure = 69.4 inHg

Short Term Fuel Trim (Bank 1) = -12.5%
Long Term Fuel Trim (Bank 1) = +4.7%
O2 sensor 1 Bank 1: 0.780V @ -10.9% s.t. fuel trim
O2 sensor 2 Bank 1: 0.780V @ -0.8% s.t. fuel trim

Symptoms experienced:

1. Fuel consumption has increased
2. Jolty, stumbling performance at 3000rpm
3. Possibility of stalling on over-run.

Sometimes, if I'm lucky, the ASC+T lamp goes out on ignition, and if I kept the revs below 3000, it would stay off; but then sometimes it would just kick-in again as I'm driving along at a steady speed, at medium load!

I have visibly inspected connections, fuses and relays already, so I am hoping for some pointers to possible causes of the above.
Is it most likely that one of the T-MAP sensors is trashed, causing a faulty high reading which in turn is causing the ECM to trim the fuel incorrectly?
Or perhaps could it be a dodgy by-pass valve?

Any help would be welcome!

[Meeerrrk]

Cooper man, where did you get the scan tool from and how much?

i have a program for VAG cars called VAG COM which proved priceless in the few years ive owned seat cupra's. Something similar for the mini woudl be great.

thanks

Mark Burton

[Meeerrrk]

i was going to direct you to my thread in this forum called "two warning lights please help" but your problem sounds totally unrelated, sorry.

Mark

[Cooper Man]

Quote: Originally Posted by Meeerrrk (original)

where did you get the scan tool from and how much?

I bought a unit that uses the ELM 323 chip from ebay for £29 - it comes with some free software which gives you the basics; although you will need to have a laptop to connect it to ...or a PC with an extra long USB cable

I saw a thread on here somewhere, where a more comprehensive setup was being recommended, that was called AutoEnginuity. It can be enhanced to provide a tremendous amount of info...

[Cooper Man]

I think it is about time I closed this thread off with the resolution:
The MAP sensor located at the very front of the manifold needed to be renewed.

[Cooper Man]

I'm now experiencing the exact same problem again!
As I was searching for details of my early experience, I discovered Jimmyarm's excellent thread "P0108 Fault Code - How to Fix"