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System Setup
By filling in the information under the “Target Engine System” column, see yellow highlight in Engine Load
Worksheet - Target System Identification Column in Yellow , each connection to the ECU can be defined.
In the actual worksheet, signals of the ECU are color coded to identify similar functionality. From this
completed worksheet, the wire harness from the engine to the ECU can be made. Materials for the AMP
brand connectors of the ECU are included to get this process started.
Engine Load Worksheet - Target System Identification Column in Yellow
KIT33812ECUEVME Reference Design
Target Engine System
Connector
Pin
Signal
Signal
Voltage
Recommended
Connector
Wire Color
Functional
1
Name
VPWR
Type
Power
Range
13.6V
Functionality
System power
Pin
Description
Input
from 12V battery
2
ISO9141 Input /
Output
0-Vbat
Bi-directional com-
munication pin for
diagnostics
3
COIL
0-Vbat
Spark control of
digital ignition sys-
tem
4
GND
0V
Module level
ground reference,
return path of Vbat
5
GND
0V
Module level
ground reference,
return path of Vbat
6
TPMD
0-Vbat
H-bridge control
for 4-phase step-
per motor for idle
speed air speed
control
Exercise 1: Complete the Load Worksheet for your target engine system.
1. Open “Load Worksheet.xls” and bring the “Instructions” sheet to the front by clicking on this tab.
2. Collect information such as wiring diagrams and schematics for the engine system to be run.
3. Use the engine system information to define how each signal of the ECU is going to be connected to the engine.
This includes a definition of an existing pin on a connector, wire color and type, and the functionality associated
with the system. This table will also be useful for configuring the software.
4. Repeat this exercise for creating a simulated engine environment.
Creation of simulated engine environment
Before the simulated environment can be created, the ECU must have a viable power source. As the ECU
is designed to work in a real engine system, it is required to have a 12 V power source. A power supply
capable of generating 12 V at 1.0 A is a good starting point for the ECU alone. Depending on the loads
that will be connected to the ECU, a much larger power supply may be required with high current. A good
starting point for working with a full featured system is a 12 V, 10 A power supply. While the total system
loads may be greater, 10 A is generally large enough since the high current loads of ignition and injectors
are not typically on simultaneously.
Small Engine Reference Design User Manual , Rev. 3.0
Freescale Semiconductor
9
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