Output Wiring 41
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Switching Loads Using a Relay
8.3.4 Switching an LED
Auxiliary outputs may be connected to a high intensity LED to provide a shift, or warning
light. However, a 1kO (1000O) current limiting resistor is required to be placed in series with
the LED. Failure to install the resistor will result in permanent failure of the LED. A bulb
may also be used instead of an LED (and it does not require a resistor).
Connection of an LED to an Auxiliary Output
8.4 Idle Speed Control
Idle Speed Control (ISC) is required to provide an acceptable idle speed when the engine is
cold or when loads (AC etc.) are applied. Without idle speed control, an engine will idle too
slowly when cold. Often the cold idle speed will be so low that the engine stalls. Likewise,
extra load loads will decrease the idle speed and may cause the idle to stall or become
unstable. The ISC system regulates the engine idle speed by adjusting the amount of air
which is bypassed around the throttle. This air may be bypassed using either a solenoid or
stepper motor.
G4 ECU's employ a sophisticated closed loop idle speed control system that provides
factory like idle speed control. This system can be used to provide idle speed control using
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