Originally Posted by VTS Help

Low Side Driving Low Resistance Loads

This is the most commonly used method of driving loads. Most solenoids used in engine management are Low Side driven (also referred to as "Switched to Ground"). When wired this way, one terminal of the load is connected to a power supply and the other to an ECU auxiliary output. The output turns on and grounds the load though the ECU. Fuel Injectors, relays, control solenoids, VVT solenoids, ISC solenoids and 6 terminal steppers and oxygen sensor heaters are usually wired this way. The following diagram shows a low side driver turned ON. Note that in the ON state the auxiliary output pin is at 0V. When the driver is turned OFF no current flows through the load and the Auxiliary output pin is at 14V. This is referred to as Low Polarity.

Low Side Driving a Low Resistance Load (Low Polarity, Drive ON)

Originally Posted by VTS Help

IC Spray Auxiliary Output

This function allows for control of a solenoid or pump to spray water onto an air/air intercooler for more efficient cooling of the intake air.

Spray Duty Cycle controls how much water is delivered once the IC Spray function is activated. 100% means the pump will run continuously. 50% means that the pump will cycle with equal on and off times.

Spray Period is the length of time taken for one complete on/off cycle.

IC Spray Mode has an effect on water consumption over a long period of time. When the switching conditions are no longer met and the Sw Off Timer period has elapsed the IC Spray drive will turn off. There is a high chance that the system will be part way though a cycle when it switches off. The Resume option means that when the switch conditions are met, the system will continue from the same position in the cycle. This means that the pump may actually be off or about to turn off even though the function has been activated. In contrast, the Reset option will automatically start spraying from the beginning of the cycle as soon as the function has been activated.

Switching Function determines which variable causes the intercooler spray cycle to become active. The ON Value and OFF Value determine the actual value at which to switch on/off the intercooler spray cycle. If the switching function is set to a Virtual Auxiliary channel the ON and OFF values are not used.