RE: RE: 3/90 COUPE QUATTRO CHANGES

[Porsray@aol.com]

Regarding building a test light for checking the fuel injection box test
codes on 
pre-March '90 20V engines:  The shop manual says to use tool US 1115. 
According to the Bentley manual, an alternative can be made up using an LED
and a 1/4 watt, 330 ohm resistor; solder one lead of the resistor to one lead
of the LED and you have a cheap US 1115.  Look in the shop manual on page
D2-250-2 and you will see this test light connected to two terminals in the 
two test jacks under the map compartment near the steering column.  You 
then connect two more wires (one to a third terminal, the other to one of the

terminals previously connected).  Connecting and disconnecting these two 
jumper wires together will sequence the code output.

I built up the above pseudo-US 1115 trouble light and separate two wires into
a Radio Shack plastic box, wiring it up similar to the scheme shown on pg. 
D2-250-2.  This way, like the diagram, I only had three connecting wires.
 For the 
wires to make good contact with the unique, tiny test jacks, I stripped the 
insulation off the ends of the wires and stripped off strands until the
remaining
wire was able to slip easily into the test jacks, then tinned the ends with
solder
to give them some rigidity.  The jumper wire connection was made using a 
banana plug and jack. 

Good luck.


Ray Calvo  (porsray@aol.com)

1990 Coupe Quattro
1995 Porsche 993