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...
Why should the ASC be affected after hitting a hole/bump in the road?
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 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
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
Fuel consumption has increased
Jolty, stumbling performance at 3000rpm
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?
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...
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