Electronic & Computer Controlled Systems Course 673 Technician Handbook (EN)

Electronic & Computer Controlled Systems Course 673 Technician Handbook © 2012 Toyota Motor Sales, U.S.A., Inc. TOYOTA Technical Training All rights reserved. This book may not be reproduced or copied, in whole or in part by any means, without the written permission of Toyota Motor Sales, U.S.A., Inc. Revision Date: July 28, 2014

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Table of Contents 673 Electronic & Computer Controlled Systems Objectives Final Student Performances ................................................................ a Course Menu ....................................................................................... 3 Section 1: Electronic Control Units Section 1 Topics .................................................................................. 5 Electronic Control Units ........................................................................ 6 How ECUs Work ...................................................................................

7 Logic Function .................................................................................. 7 Simple ECU Inputs ................................................................................ 8 Voltage ON/OFF (Switch) Input ........................................................ 9 Variable Voltage Input .................................................................... 10 Variable Resistance Input ............................................................... 11 Pulse Pattern Input ......................................................................... 12 Simple ECU Outputs ...........................................................................

13 Transistors as Switches .................................................................. 13 Pulse Width Modulation ...................................................................... 14 Duty Cycle ........................................................................................... 15 Power-Side Control ......................................................................... 16 Self Diagnosis ..................................................................................... 17 Differences in Self-Diagnosis .......................................................... 17 ECU Memory ......................................................................................

19 Types of ECU Memory ................................................................... 19 Customization ..................................................................................... 20 Initialization ......................................................................................... 21 Why Initialize? ................................................................................. 21 Section 2: Section 2 Topics ................................................................................. 23 Electronic Communication ..................................................................

24 Signals & Waveforms Types of Waveforms ....................................................................... 24 Waveform Measurements ................................................................... 25 Amplitude ........................................................................................ 25 Frequency ....................................................................................... 26 Pulse Width ..................................................................................... 27 Duty Cycle ...................................................................................... 28 Section 3:

Measuring Section 3 Topics ................................................................................. 29 Advanced DVOM Features ................................................................. 30 Signals MIN/MAX Recording ....................................................................... 30 Peak MIN/MAX ............................................................................... 30 Relative Delta ................................................................................. 30 Frequency Measurement ................................................................ 31 Duty Cycle ......................................................................................

31 Demonstration ................................................................................ 33 The Oscilloscope ................................................................................ 34 PC Oscilloscopes ................................................................................ 35 Basic Operation .................................................................................. 36 Oscilloscope Scales ............................................................................ 37 Repair Manual Suggested Scales .................................................. 38 Technical Training i

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Table of Contents 673 Electronic & Computer Controlled Systems Repeating vs. Changing Patterns ....................................................... 39 Capturing Waveforms ......................................................................... 40 Scope Pattern Comparison ................................................................. 41 The Effect of Scale .............................................................................. 42 Trigger Function .................................................................................. 43 Other Trigger Uses ............................................................................. 44 Section 4:

Using Section 4 Topics ................................................................................. 45 Introduction to PicoScope ™ ................................................................ 46 a PicoScope™ Connecting the Leads ..................................................................... 46 PicoScope Toolbars ............................................................................ 47 PicoScope Features ........................................................................... 48 Auto Voltage Scale .........................................................................

48 Auto Setup ...................................................................................... 48 Manual Voltage Scale Settings ....................................................... 49 Manual Time Scale Settings ........................................................... 49 Turning the Trigger On ................................................................... 50 Setting the Trigger .......................................................................... 51 Start and Stop Capturing ................................................................ 52 Horizontal Zoom .............................................................................

53 Rulers ............................................................................................. 54 Add Measurement .......................................................................... 56 Sample Rate ................................................................................... 57 Displaying Two Channels ............................................................... 58 Separating the A-B Traces ............................................................. 59 Printing, Saving and Sending Patterns ........................................... 60 Ground Plane Issues ..........................................................................

61 PicoScope Over Voltage Protection ................................................... 62 Section 5: Using an Inductive Section 5 Topics ................................................................................. 65 The Inductive Clamp ........................................................................... 66 Clamp Polarity ............................................................................................ 66 Current Rating ................................................................................ 67 Preparation for Use .........................................................................

68 Converting Measurements to Amps ............................................... 69 Amp Clamp Applications ..................................................................... 71 Diagnosing Short Circuits and Parasitic Draw ................................ 71 Diagnosing Motor Faults with an Oscilloscope ............................... 72 Fuel Pump Diagnosis ...................................................................... 73 Determining Fuel Pump Speed ....................................................... 74 ii Technical Training

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Table of Contents 673 Electronic & Computer Controlled Systems Section 6: Pico Setup Starter Draw Section 6 Topics ................................................................................. 77 PicoScope Software ........................................................................... 78 DEMO Program and TMS Database Launcher .................................. 79 DEMO Program .................................................................................. 80 PicoScope File Menu .......................................................................... 81 PicoScope Edit Menu .........................................................................

83 PicoScope Probes .............................................................................. 84 PicoScope View Menu ........................................................................ 85 Waterform Properties .......................................................................... 87 PicoScope Measurements Menu ........................................................ 88 PicoScope Tools Menu ....................................................................... 89 Waveform of an Engine Starting Event ............................................... 90 Amp Clamp Orientation ......................................................................

91 Correct Channel Selection .................................................................. 92 Section 7: Overview of Section 7 Topics ................................................................................. 95 Why Use Multiplexing ......................................................................... 96 Multiplex Communication Applications of Multiplexing ............................................................ 96 Benefits of Multiplexing ................................................................... 96 Multiplexing .........................................................................................

97 ECU Communication .......................................................................... 98 Signaling Between ECUs .................................................................... 99 Communication Protocols ................................................................. 100 Multiplex Topology ............................................................................ 102 Ring Topology ............................................................................... 103 Two Opens in a Ring Network ...................................................... 104 Open in a Star Network ................................................................

105 Open in a Bus Network ................................................................. 106 Single Wire vs. Twisted-Pair ............................................................. 107 Advantage of Twisted-Pair Wiring ................................................ 108 Section 8: Multiplex Circuit Section 8 Topics .............................................................................. 109 Additional Properties of MPX Protocols ............................................ 110 Diagnosis Communication Direction .............................................................. 111 Transmission Timing .....................................................................

112 Collision Detection ........................................................................ 113 Data Casting ................................................................................. 114 Sleep Mode ................................................................................... 115 Wakeup Function .......................................................................... 115 Serial Interconnect Line (SIL) ........................................................... 116 Body Electronics Area Network ........................................................ 117 Local Interconnect Network ..............................................................

118 LIN Characteristics ....................................................................... 118 LIN Gateway Function .................................................................. 119 LIN Diagrams ................................................................................ 120 Controller Area Network .................................................................... 121 Terminating Resistors ................................................................... 121 Technical Training iii

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