AVI

Analogue Voltage Input - An input to the ECU that is varying in voltage from 0-5v.

SPI

Synchronised Pulsed Input - A digital or reluctor input to the ECU that is varying in duty and/or frequency. Can be either 0V, 5V or 12V only.

DPO

Digital Pulsed Output - A digital output from the ECU that is varying in duty and/or frequency. Can be either 0V, 5V 8V 12V only.

Crank (Trigger)

Trigger Input - An engine position input that usually has one pulse per cylinder event or greater.

Cam (Home)

Home Input - An engine position input that usually has one pulse per engine cycle or greater.

OBPS

On Board Pressure Sensor - A pressure sensor that is internal to the ECU.

DBW

Drive By Wire