Best source for an ECM for the '91 200 TQ 20v?

[Mike Miller]

Have you tried swapping the ECM with another one from a working vehicle? 

--mike

----- Original Message ----- 
From: Jim Hollander at Hot Grips Mfg., Inc. 
To: 200q20v at audifans.com 
Sent: Thursday, December 02, 2010 12:13 PM
Subject: Best source for an ECM for the '91 200 TQ 20v?


On my "Unable to start" 1991 200 TQ 20v after getting the Vag-Com, and 
following the Vag-Com codes that my car had a bad engine timing sensor and 
bad engine rpm speed sensor I replaced them both assembled and complete with 
the aluminum bracket.  Actually a used one from Shokan for $178. incl. UPS. 
I confirmed that both used sensors were good with the ohm-meter test showing 
about 950 ohms between terminals 1 and 2.

Installing those two known good sensors didn't help the car to start, so I 
flatbed trucked it to the local Audi repair shop (not a dealer) and they 
used a computerized mechanic's aid to go thru some diagnostic tests, and 
determined there was no power at the ECM pin # 25 so they believe I may have 
a bad ECM.  They did not have the VW break-out box, but instead followed the 
Mitchell's online guide.

My ECM was chipped by a company maybe 10 years ago, which increased the 
engine output. At this point I can purchase a used ECM from Shokan in New 
York, or possibly a used one from Force 5 online....what else are my 
options?  Who is the best source used or am I better off only buying one 
new?  (No, I'd prefer not to flat bed the car 60 miles to my closest Audi 
dealer).  Are there any shops that have the ability to take my ECM and test 
it to determine if it is bad?

The numbers on my ECM are Bosch 0 261 200 451 and VW 447 907 404 AA. 
Motronic.

Jim in NH 

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