AEM 30-6905 Universal Programmable EMS-4 - Manual (Page 36)

Page 36 of 279 EMS-4 Install and Tuning Guide_Rev 1.6
Fuel Pump and Idle Air Control Example Circuits
The example above shows proper wiring design for inductive loads like fuel pump relays and
idle air control/boost control solenoids. Note that simple on/off type outputs from the EMS-4 can
be connected to any GPIO output but Pulse Width Modified (PWM) circuits such as those used
for idle control or boost control must be connected to GPIO 5
– 8, pins 14 – 17 on the 36 way
ECU connector. Note that the EMS-4 does not support Stepper Motor idle air control
valves.
Do not connect the power side of any actuator (relay, solenoid, etc.) direct to the
battery. Only use switched, fused power as shown above. Refer to the EMS-4 System
Diagram for more information.
DO NOT CONNECT
DIRECT TO BATTERY