The ECU computer mounting frame can be removed from the car for easy installation. This example uses a 944 Turbo ECU which also has a KLR computer. Your application may not use a KLR computer. With the ECU frame removed from the car, remove the four screws connecting the DME computer to the frame shown here. If you are using the Multi-Board in a 911 application, your computer is under the driver's seat.
Next you will bend back the tabs on the bottom of the unit which hold the top cover on. Remove the top cover exposing the computer circuit boards. Looking at the end opposite the harness connector, you will see two plastic pillars between the two circuit boards. Gently use finger pressure to seperate the two boards at these pillars, they just snap together.
Once you have seperated the two pillars, lay the ECU flat and where the top circuit board attaches to the harness connector you will see two black tabs through holes in the board, holding the board to the harness connector. While gently pulling the board away from the harness connector use a small tool (pen/screwdriver/etc) to push the tabs down and slide the board out of the harness connector.
Now you may open the ECU fully. Do this with care, as not to bind the gray ribbon cables connecting the two boards together. You see the socket at the bottom of this picture where the chip was inserted, this is where the new chip is inserted. Note the orientation of the chip via the notch on the left.
Now gently pry the chip up a little at a time on each end with a small jeweler's screwdriver or other small instrument as shown until the chip is free.
Insertion of the Multi-Board is critical, align the notch end of the chip socket, with the notch on the Multi-Board. You will notice printing on the circuit board illustrating the notch end, seen in the picture above. On the 944, if the computer is open as above with the top board unfolded toward you, the chip notch goes to your left.
Lay the board lays flat on a hard surface. Once you know the pins are lined up, press firmly but gently against the chip until it is fully seated in the socket.
Next reverse the above procedure to re-assemble the circuit boards. Fold the top board over, insert the cable harness side into the grooves in the cable harness connector, then push the two pillars at the other end together until they snap. Next you want to create a route outside the ECU for the Multi-Board switch cable. I suggest cutting two slits about 1/2" long and a bit more than the switch cable's width apart in the side lip of the top cover, then bend back the metal between the slits to create a hole for the switch cable. Alternatively you can use a Dremel tool to just route out an opening. Either way, insure that when the cover is fully closed the cable is not going to be pinched or pushed against a sharp edge.
Replace lid, fold tabs over to hold it on. Replace DME computer on frame using the four screws you took out above, take note that the round spacer goes on the side next to the KLR computer and there is an indent in the frame to put it in if it is a 951 application. Replace frame on floorboard, replace board over frame.
Glue carpet back down since
you killed the velcro. Put a band-aid on your bloody knee.