MG Repair Table of Contents
5
1 Safety Information 9
1.1 Operating Safety ................................................................................ 10
1.2 Service Safety .................................................................................... 12
1.3 Operator Safety while using Internal Combustion Engines ................ 13
1.4 Towing Safety ..................................................................................... 14
1.5 Reporting Trailer Safety Defects ........................................................ 14
2 Theory of Operation 15
2.1 Basic Schematic ................................................................................. 15
2.2 Introduction ......................................................................................... 16
2.3 Terminology ........................................................................................ 18
3 Electrical Testing Techniques 22
3.1 Checking Continuity ........................................................................... 22
3.2 Checking Resistance .......................................................................... 22
3.3 Checking Voltage ............................................................................... 22
3.4 Probing ECM Plugs and Pins ............................................................. 23
4 ECM Background Information 24
4.1 ECM Handling Precaution .................................................................. 24
4.2 Normal Boot-up Sequence ................................................................. 25
4.3 Display Variables and Values ............................................................. 28
4.4 ECM Display Screens—Start Switch in Remote Position ................... 29
4.5 Additional Variables Monitored by the ECM ....................................... 30
4.6 Voltage Display Errors ........................................................................ 36
4.7 ECM Automatic Engine Shutdown Conditions ................................... 38
4.8 ECM Circuit Boards ............................................................................ 39
4.9 Control Wiring Numbering & Colors ................................................... 40
4.10 Removing and Installing the ECM ...................................................... 43
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