Smart Cover HHO EFIE, Installation And Operation Manual, Page: 5 / 10

HEC Chip - Installation
guide
5
Populated pins in the OBD-II Port
The OBD-II Port has 16 pins arranged in a numerical order. Please refer to the illustrations below
for typical configuration of the OBD-II pins according to the position of the port in the car:
As you can verify the numeration is exactly the same whatever is the position of the port. Use a
paper to write down the pin numbers populated in the OBD-II port. Look at the example below:
The populated pins are: 1, 4, 5, 7, 11, 13 and 16 If you are not sure, take out the OBD-II port and
check the wires connected on the back.
Protocol verification and wire connections
The 4 wires of the HEC Chip will connect to the wires on the back of the OBD-II port. The Red wire
will always connect to the wire coming from pin 16 (+12V Power) and the Black wire will always
connect to the wire coming from pin 4 (Ground). The Green and White wires will be connected
according to the protocol in your car:
PWM - If pins 2 and 10 are populated, then connect White to pin 2, and Green to pin 10.
VPW - If pin 2, but not pin 10 is populated, then connect White to pin 2, and Green to pin 5.
ISO - If pin 7 is populated, then connect White to pin 7. Connect Green to pin 15 if populated or pin
5 if not.
CAN - If pins 6 and 14 are populated, then connect White to pin 6, and Green to pin 14.