CRANK SENSOR HARNESS INSTALL 944T
In the following instruction, we are installing a
Crankshaft Reference Sensor Harness into the 944 Turbo harness. The 944
would be performed the same way. This factory wiring harness happens to be out of the car.
Many of you would be installing this reference sensor
harness with the factory wiring harness still in the car. All steps would be the same. You just do your
work under the hood, and under the dash. It is not necessary to
remove the factory harness and we advise against it unless
you're pulling the engine at the same time.
If you need help finding the DME and KLR, and need help locating connectors,
refer to the DME & KLR Chip Install instructions. This will show you where they are and how to access them.
Step #1 "Position & Placement of Harness"
Lay out and position the new Reference Sensor Harness so that the plugs are in the same location or length from the main harness as the old plugs.
Step #2"Through the Firewall"
You will need to pass the new Reference Sensor Harness through
the firewall into the car. A good location to do this is
through the large rubber firewall boot/seal. You can poke
a hole through it with a small Phillips screwdriver, then
use a knife to make a "+" type cut. Just large enough to allow you
to push the wires through. It may work better to pull the
wires through by taping onto a coat hanger wire or screwdriver
from the foot well side of the boot then pulling them through.
This harness pictured already had our Fuel
Injector Harness installed which is why you see two
new harnesses.
Step #3 "Disassemble DME Plug"
Remove the small straight blade screw on the end of the DME plug. Roll
back or slide the Rubber Boot on the opposite end.
Step #4 "Slide DME Connector Cover Off"
Just like it says. Slide the cover off as shown.
Step #5"Locate DME Pin Numbers"
The DME pin numbers are located down both sides of
the DME plug. On this side you see the numbers 1 thru 18, on the other
side is 19 thru 36.
We will be working with wires at pin numbers 5, 8, 25,
26, 27 and 23.
Step #6 "Remove Pin Retaining Rail"
Simply remove this light green colored pin retaining rail from both
sides of the plug. This keeps
the pins locked into place. Without removing this, you cannot
remove the original wires which is the next step.
Step #7 "Remove Wires Pin #'s 5, 8, 25, 26 and 27.
If you study the new wire terminals on the Reference Sensor
Harness, you will notice
a small tang or tab that springs out of the side of the terminal that works like a fish hook. This must be depressed in order to remove the old pin/wire from the DME
plug. There is a small square area or access point on the
side of the terminal pin. If you slide a small object down this hole such as a small
Allen wrench, small screwdriver (like the one you get in a eye glass repair kit) or even a heavy paper clip, you can depress
this tab. Once depressed, you can simply pull the wire out from the other side. This is
the hardest part of the job. They can be a little stubborn. You might try pushing the wire
in tight, at the same time your trying to depress the tab. Then pull on the wire. Once you get the
first one out, the second will probably take you seconds.
There is actually a tool for this, but most people have something around the house or tool
box that will work.
Remove pin/wires from slots #5, 8, 25, 26 & 27.
Step #8 "Clip Brown Ground Wire"
On DME pin #5, there are two wires attached to the original terminal. A ground wire (black) for the old reference
sensor, and a chassis ground wire (brown). We need to cut the
brown wire just after the terminal as shown here.
Step #9 "Clip Black Ground Wire"
The ground wire on the second or other old reference
sensor wire (black) ties into pin #23 along with a ground from
the O2 sensor (also black). We need to cut the black wire which is
the reference sensor ground wire loose from the other black wire.
We leave the pin #23 in the DME plug with the 02 sensor ground
remaining, and just cut the black wire as shown from the
reference sensor wire.
Our new reference sensor grounds will be attached at another location.
Step #10 "Finishing Up the Connections"
There are a few things going on here.
The new Reference Sensor Harness wires were fished through the rubber grommet. We spread the grommet with
a pair of needle nose pliers making a passage way to slip
the wires through.
The old reference sensor wires were clipped off a few inches from
the plug. There isn't room for the old and new in the plug so they must go.
The brown ground wire we clipped in step #8 has been stripped bare
on the end preparing it for soldering.
Step #11 "Solder Ground to Grounds."
We need to attach the brown ground wire to
the bare ground wires on the new harness. Here you see the solder connection done. It is not necessary to
tape this connection.
Insert the new terminals into their assigned slots.
The wires on the new harness are tagged with the assigned DME pin numbers.
Step #9 "Close Connector Up"
Re-install the Pin Retaining Rail you removed in step 6. Slide the DME connector cover back into place. Re-install the small
end screw. Slide or roll the rubber boot back into place.
The DME Connector is now complete.
