Reading Fault codes on '89 100

["Jeff Wolf" <jeffwolf@cdc.net>]

I still have an intermittent low idle problem with my 1989 100 automatic.  I
believe I have a wiring fault but have been unsuccessful at pulling the
engine codes.

I don't believe I have a check enging light on my car.  It has been
suggested to me that I might have a light but it isn't inserted into the
dash display.  Another suggestion is to pull the codes from the connector in
the passenger footwell.  After searching the archive I found one of Phil's
posts describing this procedure for the 3B engine with motronic ignition
which I've copied below.  Will this same procedure work on my car or will I
fry something.


Thanks in advance.

Jeff Wolf
Chattanooga, TN  (Audi-dealerless)





-Pasted in----

I got a momentary check engine light this morning.  Is it possible to read
the> codes on the 3B motor w/ Motronic ignition via a test LED?  The
Bentley
lists> this procedure only for the K-Jetronic motors.  Or do I need the
1551
wonder> tool?The following is in preparation for the ur-quattro 20V.
Yours
may be similar:
============================================================================
==
Nasty.  Buy a VAG 1551.  Otherwise - time for some ASCII art:
          1       2       3
      /---\   +---\   +---\
      | O |   | O |   | O |  2
     +---+ +---+   +---+
      | O |   | O |   | O |  1
      +---+   +---/   +---/

1 is black, 2 is brown and 3 is blue.This connector is (in a German car) in
the
driver's footwell.  I assume it will be on the passenger side in a UK
car.The
pin assignments are:        1.2  Positive      1.1  Chassis      2.2  J220
or
VAG 1598 pin 13      2.1  J220 or VAG 1598 pin 55   Connect a diode test
lamp
between 1.2 and 3.2.  Attach leads or a push-buttonbetween 1.1 (A) and 2.1
(B).
Connect A and B for four seconds.  The diode should light up.Break A and B.
A
code will be blinked out.  To get the next code,touch A and B together for
four
seconds again.  The end is signalledby 0000 - pulses 2.5 seconds apart.
Code
2111 should be ignored ifthe ignition is on and the engine is not turning,
unless an unsuccessfulattempt has been made to start it.
============================================================================
Let
us know what the codes are - the table is too long to post.  Well,too long
to
type, anyway.- -- Phil Payne phil@sievers.com Committee Member, UK Audi
[ur-]quattro Owners Club------------------------------