AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 35)

Page 35 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
The vehicle speed sensor must be a hall-effect device. It is used to detect wheel speed for use
in various EMS-4 software functions.
Harness Connections
Vehicle Speed Sensor Harness Connections
Name Wire
Wire
Color Stamping
VSS Ground 22 Black PWR GND
VSS Hall Input 22 White VSS
+12.0 volts 22 Red PWR
PWR GND – Connect to vehicle speed sensor ground pin.
VSS
– Connect to vehicle speed sensor signal pin.
PWR – Connect to vehicle speed reference voltage pin.