200tq check engine light, but no codes!?

[Brett Dikeman]

At 9:31 AM +0100 2/16/04, Phil Payne wrote:
>  > Well ... tried your technique today ... and sure enough I did get an
>>  error code to flash out. It's 2113 which indicates a problem with the
>>  Hall Sender.
>>
>>  The MAC-14 computer on the '90 200tq model DOES have permanent fault
>>  memory, but I don't know why this fault wasn't registering before.
>>  http://www.sjmautotechnik.com/ecuf_MC2.html#fctwo
>
>I've got an experimental SJM ECU in my Type 44 - it produces a short 
>flash whenever knock is
>detected and a long flash when a code is stored.  But I've noticed 
>that _some_ codes - or
>rather some instances of some codes - are not preserved across a 
>power cycle.  Some are - I
>don't know what the rules are.

I've discovered that the 3B ECU has two 'levels' of many of its fault 
codes.  A printout I got from a VAG-155x(the real thing) showed some 
interesting tidbits- a few fault codes had "intermittent" printed 
next to them.  I believe it'll even report both separately.

Intermittent codes will -NOT- be flashed by the check engine light 
blink system...and to make matters worse, the 3B -also- doesn't store 
some codes on shutdown unless it really thinks it ought to.

So, the general rule seems to be regardless of the vehicle in 
question- pull the codes after a lengthy run, with the engine still 
going, using a proper scan tool.  It's clear the jumper business is 
really only for when something's seriously wrong.

Brett
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