[urq] MAC-02 Pinouts

Michael Hopton Michael at siliconoptix.com
Tue Nov 1 14:59:19 EST 2005

Does anyone know the pinout changes between the early (yellow)
and the late (blue/green) MAC02 ECUs?

Cheers, Mike

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of alexander stickler
Sent: Tuesday, November 01, 2005 2:14 PM
To: urq at audifans.com
Subject: [urq] Looking for a MAC-02 for 1983 URQ

Anyone have a MAC-02  (yellow label - early) for my
1983 URQ? 

I am reasonably confident that my FI issues (duty cycle stuck @50%) are
inside the ECU. According to the factory manual, the duty cycle should
be around 70+/- 6% with the idle switch disconnected and the FT switch
triggered.  Unfortunately, I get 75 with both idle and FT switches
tripped. Having checked every wire going into the ECU, the diagnostic
flowchart leads to "Replace F/TCU."

So, what I am looking for is a MAC-02 to buy or to borrow to isolate the
problem.  In the borrowing case, I would pay postage both ways. Can
anyone help me out?



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