Output Wiring 39
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used to perform a wide range of functions. However, the following limitations apply:
· All Auxiliary, Ignition and Injection outputs can switch a load by supplying a ground for
it.
· Aux 5 to 8 can be used as high side drives (ie they can supply power to a load).
· A Three Terminal ISC Solenoid must be wired to Aux 1 and Aux 2.
· An ISC Stepper Motor must be wired to Aux 5, Aux 6, Aux 7 and Aux 8.
· Aux 5 to 8 and Ignition 1 to 4 when used as Aux channels can not be Pulse Width
Modulated (PWM) above 300Hz.
· VVT Solenoids must be wired to Aux channels 1 to 4.
· An Electronic Throttle Control Motor must be wired to Aux 9 and Aux 10.
Auxiliary Outputs are normally used to supply a GROUND to actuate solenoids, relays, LEDs
or lights. The amount of current flow is entirely dependant on the internal resistance of the
device connected to a drive. The load must not draw more than 2 Amps. This means that a
directly connected load should have a resistance exceeding 7O. If the resistance is lower
than this a relay should be used. DO NOT connect +12V directly to any auxiliary output.
The following list shows only some of the devices that can be controlled by Auxiliary Outputs
· Idle Speed control (ISC) Solenoids and Stepper Motors
· Boost Control Solenoid
· Fuel Pump Relay
· Fuel Pump Speed controller
· Engine Fan Relay
· A/C Clutch Relay
· A/C Fan Relay
· Inter-cooler Spray Pump Relay
· Tachometer
· Check Engine Light
· Purge and EGR Solenoids
· Variable Valve Timing Solenoids
· Speedometer
· Oxygen Sensor Heater
· Water Injection
· Nitrous Oxide Injection
· Electronic Throttle Control
· General Purpose Switching
· General Purpose Pulse Width Modulation (PWM)
8.3.1 Low Side Driving (Switching To Ground)
On a typical two-terminal solenoid, the Auxiliary Output should be connected to one terminal
to supply a ground, while the other terminal should be connected to an ignition switched (key
ON) 12V source. A warning/shift light may also be wired the same way. This configuration
is shown below.
Solenoids and relays wired to auxiliary outputs must take their
switching coil power supply from a switched (through a relay) source.
Do NOT use a +12V hot supply (direct from the battery). Doing so
may result in the ECU staying powered up when the key is switched
off.
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