Inputs And Outputs; Ignition Outputs; Injectors / Aux Outputs; Stepper Motor Outputs - ECU Master EMU User Manual

INPUTS AND OUTPUTS

Ignition outputs

Ignition outputs can be used to control passive coils as well as active coils (with ignition module).
The coil type is defined by the parameter Ignition outputs / Coil type. In the case of using passive
coils the EMU enclosure acts like a heat sink. The passive coils also require high current and
2
proper wire size must be used (>1mm ).

Injectors / AUX outputs

Injectors and AUX outputs are Low side type (switch to ground). Fuel injectors can be controlled
only by injector outputs. Other functions can use both Injectors and AUX outputs. All of the outputs
are rated for 5A and have over temperature protection. It is allowable to connect up to 4 high
impedance (Z) injectors to one output. In the case of controlling solenoids with PWM signal (like
VVTi or Idle solenoid) it is required to use a flyback diode.
WARNING !
Disconnecting the grounds during device operation may lead to device damage!

Stepper motor outputs

Stepper motor outputs are used to control unipolar and bipolar stepper motors (for idle control). It
could be also used as generic output to control relays / solenoids with a current draw less than 1A.
Stepper motor outputs are 2 state output (ground / +12v) and have built-in flyback diodes. Due to
this fact it is very important to assure that devices (relays, solenoids, etc.) connected via stepper
motor outputs will not be powered if the ignition is off. Otherwise the EMU device will be powered
via the embedded flyback circuit.

Frequency inputs

Trigger inputs and VSS input are considered as a frequency inputs. All of them can work with VR
as well as Hall sensors. Primary trigger input in the case of VR sensors acts like an adaptive one
which significantly increases the immunity to noise. For all frequency inputs, it is possible to
activate a built in 2Kohm pull-up resistors to +5V.
Page 32