Fuel Pump Relay differences

[Ben Swann]

I only used the harness associated with CIS-E3.  There were a number of
extra connections other than power and ground.  It has been quite a feat
trying to sort it all out, but I pretty much have everthing figured out now.

The differences in fuel pump relays added to the confusion, but it all
starts making sense after I have gotten all the details sorted.  There are
still some connections for the trip/fuel computer that I stll need to work
out, probably more complicated since this 4kq did not come with the trip
computer. I think i have found the connector for it and have a cluster with
computer and the computer control button panel, so I should be able to get
this stuff working too.

I plan to update my web pages with the information on this.

Cheers!

Ben
----- Original Message ----- 
From: "Brendan K Walsh" <bkwalsh4201 at hotmail.com>
To: "'Ben Swann'" <benswann at comcast.net>
Sent: Thursday, February 05, 2004 7:34 PM
Subject: RE: Fuel Pump Relay differences


> Did you use the right side harness also?, I ran into this with my 87 to
> 87.5 swap. Even though the 87 had a digi dash there are still major
> differences, I would think that having an analog would complicate it
> further. Just one reason I stayed cis-e.
>
> -----Original Message-----
> From: Ben Swann [mailto:benswann at comcast.net]
> Sent: Wednesday, February 04, 2004 6:58 PM
> To: quattro at audifans.com
> Cc: Ben Swann
> Subject: Fuel Pump Relay differences
>
> I am trying to find out why the fuel pump relay for '87.5 GT
> coupe/CIS-EIII or similar from 5ktq will not work in the '87 4kq that I
> have transplanted the NG and CIS-EIII wiring harness.  At this time I
> feel fairly confident that everything for the ECUs is wired properly and
> pretty much according to the diagram for '87.5 GT Coupe.
>
> Looking at the relay differences, each relay uses 46/15 ign and 51/1
> coil(1) to trigger and 48/30+ closes to 52/87 to power the pump.  I have
> wired 49/La previously unused on the 4kq to connect to the ECU test wire
> and a power feed as shown in 97.5 diagram for a knock sensor/engine
> light.
>
> The other teminals 53 and 59 are not wired and the relay I have for 87.5
> GT Coupe does not even have a 53 terminal.
>
> Any ideas why it doesn't work? From the looks of the diagram, the relay
> should work even without changes, and the added feature is the fuse for
> diagnostics.
>
> Ben]