ECU Removal Instructions
1983-85 Quattro with Hitachi MAC-02
1986-88 5000Turbo, 5000TQ
1989-90 200T/TQ
with Hitachi MAC10/11/14
1991 200TQ 20V with Bosch Motronic
1992-95 S4/S6 with 5 cylinder 20V with Bosch Motronic
-
ur-Quattro Coupe with MAC-02 ECU
The ur-Quattro Coupe has the ECU mounted on the side of the glove box
assembly. The glove box assembly will need to be removed and then the
ECU can be unbolted from the glove box piece. The ECU wiring connector
uses a metal spring tab to hold the wiring harness connector to the ECU
connector. The vacuum/pressure hose should be carefully removed after
loosening the hose clamp and by CAREFULLY prying off the hose. Be very
careful as the ur-Q ECU uses a plastic nipple on the internal pressure
sensor and this can break off when removing the vacuum/pressure hose if
you are not careful.
1985-1990 5000/200, Turbo and Quattro, MAC10,
MAC11 and MAC14 ECU's
The ECU is located underneath the right side kick panel on the passenger
side just below the dash board. One Phillips screw at the bottom of
this kick panel cover needs to be removed so that the kick panel can
be pulled slightly forward and then out. Here is a photo of the MAC14
ECU as installed in the 1989-90 200TQ.
The ECU is secured to the body with another Phillips screw near the
upper front edge of the ECU. It may help to pull the plastic bag around
the connector up a little to see towards the front edge of the ECU.
Remove this screw and washer which will allow the ECU to be pulled
out of the lower retaining bracket and to gain access to vacuum/pressure
hose attached to the ECU port. Loosen the hose clamp screw and then
carefully use a flat blade screw driver to pry up the hose off of the
port on the ECU.
After removing the hose, the main ECU wiring harness connector can
be removed. Push the harness connector locking release tab in while
lifting up the one edge of the harness connector. The wiring harness
connector will then swing upward. Take note that there is a large hook
on the other end of the wiring connector that will only come out of
the ECU connector if the wiring connector end with the release tang
is rotated up past a 45 degree angle. The ECU connector piece is a little
fragile so don't force the wiring harness connector too much or you
can break the connector on the ECU.
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