ECT Display Driver – Installation for AP2 Module
The ECT Display Driver is a small module with a removable wire harness that mounts behind the driver’s foot well cover. All wiring connections are near the ECM and only 4 wires are needed for basic operation:
• +5v power from the ECM (T-tap)
• Ground – available at ECM mounting bolt
• ECT sensor wire (T-tap at ECM)
• Dash temperature gauge wire (must cut at ECM)
If you want to use the optional Alarm Output feature 3 more wires are needed:
• Ground (must be run separate from the module’s power ground)
• Module output (negative) to your alarm device (sounder or indicator light, not included)
• +12v ignition or accessory power wired directly to your alarm device
Installation Details: refer to the photos and wiring diagram at the end of this manual
1. Remove the driver’s side doorsill trim and the driver’s foot well trim. (if you don’t know how to do this you probably shouldn’t be doing this modification)
2. Locate the connectors and wires you will be using, see photos at the end of this manual.
a. Temperature gauge wire (Yellow/Green) – Easily seen at the top left of connector A on the ECM.
b. Power wire for +5v (Yellow/Blue) – This is on the rear-most row of wires on connector C, in the ‘middle’ section of the connector. You will have to remove connector C from the ECM to locate this wire
c. ECT Sensor wire (Red/White) – This is also on the rear-most row of wires on connector C, in the ‘middle’ section of the connector.
3. Attach crimp connectors to the ECM wires as detailed below.
a. Using a pair of pliers, clamp one of the red T-taps around the Yellow/Blue wire in connector C, making sure the wire goes into the metal slot of the T-tap. If you have strong fingers you can squeeze the T-tap on the wire to hold it temporarily, then use the pliers to clamp it shut. Or, you can position the T-tap in the pliers’ jaw, then clamp it on the wire.
b. Crimp another T-tap around the Red/White wire in connector C.
c. Now cut the Yellow/Green wire a few inches away from the ECM and strip about ž” of insulation from each end.
d. Using a crimp tool, crimp a female spade connector on the end of the Yellow/Green wire that comes from the ECM.
e. Next crimp a male spade connector on the other end of the Yellow/Green wire (the end going into the wire bundle).
f. Note that the ends of the Yellow/Green wire have opposite connectors. If you ever have to remove the ECT Module you simply plug these connectors together and the temperature gauge will work like normal.
4. Attach crimp connectors to the ECT wire harness.
a. One ring terminal (each) for the Black and Brown wires .
b. The male spades crimp on the White and Yellow wires.
c. The female spade crimps on the Green wire.
5. Connect the ECT harness wires to the car wiring.
a. Plug the ECT Yellow wire into the T-tap on the Yellow/Blue wire from connector C. This is +5v power.
b. Connect the ECT White wire into the T-tap on the Red/White wire from connector C. This is the ECT sensor wire.
c. Connect ECT Green wire to the Yellow/Green wire that’s going into the wire bundle. This is the output to the dash temperature gauge.
d. Leave the Yellow/Green wire going into ECM connector A hanging loose, it’s not needed.
e. Connect the Black and Brown wires to a good ground, either at the ECM mounting bolts or the hood release latch.
Get pdf ECT Display Driver – Installation for AP2 Module
