G4 Wiring and Installation Manual42
© 2009 Link
either a 2 or 3 terminal ISC Solenoid or a 4 or 6 terminal ISC Stepper Motor. While a
solenoid and stepper motor operate very differently they both achieve the effect of
bypassing air around the throttle plate to increase the idle speed.
Some engines use a non-electronic system to control idle speed as the engine warms up.
This system contains a bimetallic strip, which is heated by the engine coolant and/or
electrically. As the engine warms up, the amount of bypassed air is reduced and the idle is
returned to its normal level. The ECU does not control this type of device. It is intended
ONLY as an idle up when the engine is cold.
8.4.1 Two Terminal ISC Solenoid
A two terminal ISC solenoid may be wired to Auxiliary Channels 1 to 8. Injection channels
can not be used for ISC control. Ignition Channels 1 to 8 can also be used to control a two
terminal ISC Solenoid however an external fly-wheeling diode must be wired.
Two terminal ISC solenoids need only one auxiliary output (or ignition channel) to open the
solenoid. A spring is used to automatically close the solenoid. Connect one terminal to the
engine managements power supply and connect the remaining terminal to an
Auxiliary/Ignition Output Output. See Figure 8.13. The orientation of the wires does not
matter.
An ISC solenoid must be wired to a switched power supply. Note that some Nissan ISC
solenoids are powered directly from the battery. This wiring must be changed,
Wiring for two-terminal ISC solenoid on Auxiliary Output
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