Fuel Pump Relay differences

Huw Powell audi at humanspeakers.com
Wed Feb 4 21:12:01 EST 2004

> 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.

If I recall correctly, the CISE3 system runs the overrev protection from 
the ECU; in CISE it is done at the fuel pump relay.

Just an idea you might be able to use to help you figure it out by 
tracking wires on the diagram carefully.

Perhaps the coil signal wire's place on the early version is replaced by 
something from the ECU on the later one, and that isn't there on your 
project car.

Hoping this might help...

Huw Powell



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