re. Fault code pulling - 1988 5000 TQ

[Ben Swann]

Tony,

The fuse terminal on top of the FP relay is used to trigger the fault code and test sequences.

See:  http://www.homestead.com/ben_swann/MCWiring.html


          47/T BS Br/G[T14b/14] Br/G > ECU/21 effectively providing ground return for FP relay through ECU
          Terminal ILa  Y> [T14b/11]Y> ECU/31 and ground side of test LED.
          49 connects inside the fusebox to Terminal Ila
          51, 53: blank/not connected

Combine this with Bently diagrams and explanation.  There are a number of places to tap into, but to avoid pulling out aux. relay panel and getting under dash, best to access the underside of the fuse box up top under the hood.

Hope you nail down the problem.

Ben

[Date: Thu, 27 Jan 2005 08:57:15 -0800 (PST)
From: Tony Hoffman <tfh400036 at yahoo.com>
Subject: Fault code pulling - 1988 5000 TQ
To: quattro at audifans.com
Message-ID: <20050127165716.60695.qmail at web53902.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii

Does anyone know which terminals you would use for the LED indicator when pulling codes. My check engine light appears to be burned out. I have a check box I've built, and want to use it. Also, can anyone verify that the two terminals on the top of the FP relay triggers the sequence.
 
Tony Hoffman]