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2003 audi tt tach wire

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=129961
Printed Date: June 06, 2025 at 9:20 AM


Topic: 2003 audi tt tach wire

Posted By: jackal28
Subject: 2003 audi tt tach wire
Date Posted: December 31, 2011 at 11:09 AM

I have been through everything with this remote start/ alarm install. Audis really do make nothing easy. I searched for CAN wires for 2 days to no avail. Finally, I decided to wire the alarm in directly. When it was almost completed I got to the tach wire portion of the install and noticed that the location was at the ECU. Well, the ECU is not easy to get at in any way with the 2003 Audi TT. Questions: Is there any other way to get the tach signal (fuel injectors, ignition coil) and if so what are the wire colors? Can I simply tap into the grounded main wire for the coils? If not, how do I remove the sheild over the ecu harness? Thanks.




Replies:

Posted By: lectricguy
Date Posted: December 31, 2011 at 11:23 AM

Here is the information from DEI:

Tachometer GREEN/ brown ac ECM, pin 37

The ECM is under the plastic cover on the firewall, under the hood.

The tach wire is also gray/brown or green at the A/C control head.

Can also go to any fuel injector and use the wire that is NOT RED / purple.

Audiovox Tech site recommends just using an injector wire.  You would use the wire that is not a common color to all injectors...i.e., Not RED / purple.



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Lectric Guy



Posted By: howie ll
Date Posted: December 31, 2011 at 4:00 PM
I have to add that your second sentence sums up work on Audis EXACTLY.
That apart lectricguy gave you the right answers.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.



Posted By: jackal28
Date Posted: December 31, 2011 at 4:29 PM
Awesome, thanks guys. I will try the fuel injector method as soon as its not 30 degrees with 20 mph winds. I NEED A GARAGE. Oh well, I should have one within a month.


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