National Instruments Direct Injector Driver System Manual
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3.3.3.1 Direct Injectors to DI Driver Channels
Connecting Direct Injectors to the Direct Injector (DI) Driver Module
Direct injectors have two pins or wire leads. For solenoid injectors, the polarity of the injector leads typically does
not matter. However, the polarity does matter for piezo injectors. Each DI Driver module has three channels and
provides a positive and negative terminal for each channel labeled INJX+ and INJX-, where “X” represents the
channel number. Solenoid and piezo injectors cannot be mixed within a DI Driver module. The DI Driver module
supports three channels for solenoid injectors and two channels for piezo injectors. When the module is configured
for piezo mode, channels 1 and 2 are available as driver channels, while channel 3 is unavailable and must be wired
with a shorting jumper across the positive and negative terminals.
Solenoid Injector Wiring
Typical wiring for solenoid injectors to a DI Driver module is shown in figure 3.3.3.1.a.