Nira i7x - IAC Electrical Connections

© 2005-2016 Nira Control AB 38
Some possible IAC valve/motor configurations are:
 2-terminal IAC valve
 3-terminal IAC reversible motor with 1 coil and 2 windings
 3-terminal IAC reversible motor
3.17.1 IAC Electrical Connections
Connect a 2-terminal IAC valve to the harness:
IAC valve pin
NIRA i7x harness wire
1:
IAC +
2:
IAC -
The picture below describes the function of an IAC valve.
Note that at 0% duty cycle, the engine speed is high. The valve closes
completely at around 30% duty cycle and then begins to open again,
increasing engine speed.
Picture 3-6: IAC valve function
The varying duty cycle PWM signal from NIRA i7x is used to modulate the
relationship between the opened and closed states of the valve, thus
controlling the amount of bypass air that reaches the engine.