SECU-3 Micro installation manual
SECU-3 Micro installation manual includes following sections:
Wiring of ground
Ground should be connected to the SECU-3 Micro unit as shown below:
Different wiring diagrams (examples)
Connecting Hall effect sensor
Connecting VR CKP sensor
Connecting coolant temperature sensor
Connecting TPS or throttle limit switch
Input for switching between sets of tables
Connecting IAT (MAT) sensor
Manual ignition timing correction
Connecting embedded MAP sensor
Using an embedded stroboscope
If IGN_OUT2 is free, than it can be used for stroboscope (SECU-3 has an embedded stroboscope function). An 1-3W LED (or several bright low-power LEDs) is used as strobe light, which is connected to IGN_OUT2 (J3/5) output:
IGN_OUT2 should be reassigned to STROBE (see SECU-3 Manager User’s Manual).
Note that LED will on steady with little brightness, because IGN_OUT2 output has 1k pull up resistor to 5V. It is normal. If you don’t like it, than remove R7 resistor.
Connecting to tachometer
If you use single ignition output and/or high-tension distributor, the tachometer input (if a high-voltage) should be connected to the primary winding of the ignition coil. If you are using Wasted Spark configuration, you can try to connect a tachometer with one of the following schemes:
Connecting SECU-IGN-DRV4 driver
Example of connecting SECU-IGN-DRV4 driver to control ignition of the 4-cylinder engine in “wasted spark” mode is shown below.
Connecting choke actuator (stepper geared-motor)
In most cases SECU-3 Micro unit works well with direct connection of supply (J3/12) to the board network. If you install it on vehicles/engines with bad quality of board voltage (ripple, gaps), then you may need to supply unit via following schematic:
Capacitance can be even above, for instance 2200…4700 uF. You can also try to use a 10…20 Ohm, 0.25W resistor instead of diode (nevertheless, usually diode will give better results).
Configuring unit’s board
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