1995 850 Computer Codes

Check Engine Light just came on in my 850. I get the all the following
codes:

A1: 124 Mode selector faulty or short circuit to ground

A2: 241 EGR system flow faulty

A3: 142 Faulty brake pedal switch, open or short
213 Left rear wheel sensor, no signal on moving off
214 Right rear wheel sensor, no signal on moving off
424 Pressure switch for TRACS, faulty or short circuit
(I already know my ABS is on the way out . . .)

A6: nothing

A7: 122, 113 (What are these)

I gone through my Haynes, & following websites:
http://seawinds.ws/volvo/check_engine.htm
http://www.volvospeed.com/maintence.htm
http://www.brickboard.com/AWD/search.htm
The only one I'm really worried about is A2: 241 EGR system flow
faulty. What is this? I've cleaned my throttle body & flame trap, what
else? Possibly air mass meter or its connections? Also, I CAN'T clear
the codes out, even following Haynes instructions, i.e. 5 seconds of
holding down the button, I get nothing, not even 1-1-1. Any thoughts,
suggestions, tips? Mike F, you've implied that there could be a short
or bad circuitry in the diagnostics that would prevent clearing
codes, yes?

Thanks for any ideas.
Jay

 

is your winter mode lights blinking ? a1 124 denotes a short in the mode
switch for the transmission..trans shifting ok ?
speedo working ?

 

It's possible there can be a problem in the wires for the diagnostic
plug that would prevent clearing codes, but I'd say it's very unlikely.
I've seen this problem that was only cured by a new ECU, but that was on
a 10 valve model with the Siemens system. Most often when someone can't
clear a code, it's because they haven't just read it. The sequence has
to be: Ignition on, read all codes, clear all codes. If you've turned
the ignition off after reading the codes, then they won't clear. And of
course there's always the "disconnect the battery for a while" method,
just make sure you have your radio code.

For your EGR flow fault code, try taking the EGR valve off the intake
manifold and cleaning it.
http://www.volvospeed.com/Repair/egr.php

--
Mike F.
Thornhill (near Toronto), Ont.

Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)

 

Yes, transmission & speedo are fine. Everything runs great, but we've
had cool, rainy weather, so I'm thinking corrosion on an electrical
connection somewhere, but hardly know where to start with this litany
of errors. Also, I just can't seem to clear codes . . .
Thanks,
Jay

 

Thanks Mike !!!
I'll get on it!
Jay