MAC-14 Diagnostics

[cody at 5000tq.com]

1594 is basically a set of jumper leads with some adaptors to fit in  
VAG wiring sockets and such. US-1115 is an LED test light, for which a  
common logic probe may be substituted. VAG-1551 (and the later 1552)  
are the OE scan tool which VAG-COM emulates.

http://www.toolsource.com/heavyduty-logic-probe-tester-noid-light-p-101291.html

^ Thats the logic probe I have, and I couldn't live without it. The  
cord is long enough to connect one end to a 911 battery (*JUST* behind  
the front bumper) and test the license plate bulb sockets, but the  
coils wind nicely enough that when not stetched its only a few feet  
long so its not a PITA to store. Awesome for diagnosing wiring issues,  
just be sure to remember that it is showing you "yes there is ground",  
"yes there is power", or "no" but it doesn't care how much power nor  
does it care about iffy connections. To light the LEDs takes a  
miniscule ammount of current and only 3 volts.

-Cody


Quoting Ben Swann <benswann at comcast.net>:

> Cody,
>
> I understand that with the wiring in the car from the factory, the   
> 2X2 "dirty" cable
> won't work.  I added the wire that should allow it to work - I need   
> to revisit this, but
> basically you need to change the wiring to be like the 3B - factory   
> setup is for VAG
> 1551 test equipment and even with that you need to "cludge" the   
> conections to get a
> readout.  For those who want to verify what I'm saying, there it is   
> on/around  D2-190-1
> in the Official Factory Repair manual.  Anyway, once I am able to   
> simply blink the
> codes, the VAG-COM should be usable.  Right now I have not been able  
>  to do either.
>
> I did a continuity test from connector ends to the ECU and things   
> are wired properly
> according to the diagrams I've seen.  There are a few connectors   
> that wiring goes
> through and even changes colors and I have all this mapped out.  I   
> had to add the
> diagnostics connectors that were taken from other scrap harnesses.
>
> Hopefully I'll figure it out today.  I just thought someone else had  
>  a clue than just
> outright saying "It won't work".  It is supposed to work both ways,   
> just the details are
> not clear and Bentley spells out procedure using specialized test   
> equipment without
> actually saying what the equipment is/does specifically - it would   
> be helpful to know
> what the Adaptors 1594 and US-1115 and VAG-1551 actually are/do
>
> Ben
> -----Original Message-----
> From: Cody Forbes [mailto:cody at 5000tq.com]
> Sent: Wednesday, September 26, 2007 11:57 PM
> To: Ben Swann; suffolkd at aol.com
> Cc: quattro at audifans.com; 'Ben Swann'
> Subject: Re: MAC-14 Diagnostics
>
> http://www.ross-tech.com/vag-com/cars/applications/v8a8.html
>
> That page says that Vag-COM will not communicate with the engine diagnostics
> on any 200 other then the 3B :-/. Another portion of thier site says that
> even if it has the 2x2 connectors it must have 4 wires, where some older 2x2
> connectors only had 3 wires.
>
> Any way about it you should be able to blink codes, and the info on Scott's
> site should apply. Going back to basics a bit... is your MAC-14 known good?
> Beyond that, have you used a DMM to check continuity between the cproper
> diag wires and the ECU just to make sure theres nothing funky like a missing
> relay that the current pases through for some only-Hans-knows-why reason?
>
> -Cody Forbes
> http://www.5000tq.com
>
> Ben Swann wrote:
>> I think we are confusing things here.  I am simply trying to blink   
>> out codes for now -
> should at least be able to do this.  In fact I know it can be done   
> and have done it
> before, just not on a transplanted MC-2/MAC-14 setup.  And of course  
>  this is the MC-2
> 10V CIS hybrid not the 3B 20V efi , but there are many who subscribe  
>  to this list
> because the '89 and '90 200Q are more similar to the '91 20V despite  
>  that the engine is
> Motronic EFI instead of the hybrid variant that was MAC-14.    
> Furthermore the diagnostics
> techniques spelled out in the Bently for the MC-2 are actually quite  
>  similar to the 3B
> probably closer "procedure-wise" than the MC-1.  But still the   
> option to blink out codes
> is there - just sometimes need to install a check engine light,   
> according to procedure.
> I have the feeling some other things have been left out and because   
> the procedure calls
> for using specialized VAG equipment, one needs to guess at what   
> these things actually
> are.  I also think there may be errors or omissions in the diagram.
>> With that, it would also be nice to use VAG-COM as the com   
>> interface is supposedly
> there.  So you are saying that you have not been able to use VAG-COM  
>  on an MC-2/MAC-14?
> I haven't either, but Bentley and SJM suggest it can be done.
>>
>> At the very least, I should be able to blink codes like on the MC-1.
>> Ben
>
>
>> From: suffolkd at aol.com [mailto:suffolkd at aol.com]
>> Sent: Wednesday, September 26, 2007 8:17 PM
>> To: 200q20v at audifans.com; benswann at comcast.net
>> Subject: Re: MAC-14 Diagnostics
>
>> The earliest EU I could read was a 200 20V 3B.  AFAIK the MAc -14 is
>> for a MC-2 BAck when Vag Com came out i asked if it could read a   
>> 1990 200 10V
>> (Mac - 14) we never tested it.  VAg-Com site listed the 3B as the   
>> earliest to "work" a
> few years ago. I don't know if that has changed.....
>>
>> try http://www.sjmautotechnik.com/trouble_shooting/pinout.html#fourtp
>> other searchs just brings up some of your posts :-)
>>
>> *********************************************************************
>>> **Ben*** Right - it  seems like I'm the one who ventures into   
>>> these territories
> first. I have a complete pinout spreadsheet for wiring this beast   
> and how to hook it up
> with Megasquirt.  I don't like putting things out there until   
> everything is working
> right.  I figured someone has likely done an MC-2/MAC-14 transplant   
> into a 4kq
>> or CGT along with associated wiring. - then they would likely have   
>> had to go through
> this.  ***Ben***
>> -Scott by BOSTON
>
>> From: "Ben Swann"
>>
>> I'm trying to run codes on my MAC-14 ECU which is currently setup   
>> to do only Ignition
> for my Megasquirt setup.  The wiring harness has been completely   
> transplanted, and I
> installed connectors for the ?dirty? OBD to connect to VAG-COM.   
> VAG-COM is not picking
> up on it.
>> Has anyone retrieved codes via VAG-COM for the MAC-14?
>> I will try connecting to flash the codes, but would be nice to use   
>> the OBD features.
>> Anyone had much success flashing the codes using fuse and CEL?  I   
>> don't have identical
> wiring with Fuel Pump Relay, but have wired according to Bentley.    
> Wondering if I am
> missing anything for this.
>>
>> Ben
>
>