Name: Komatsu WA900-3E0
Brand: Komatsu
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Electrical circuit diagram

Symbols used in electric circuit diagram

WA900-3E090-14

Index and Foreword2
Table of Contents3
Table of Contents4
Foreword7
Before Reading this Manual7
Specification Specification10
Specification Dimension Drawing10
Specification10
Specifications11
Weight Table14
Table of Fuel, Coolant and Lubricants16
Structure and Function20
Cooling System and Related Devices22
Cooling System22
Hydraulic System24
Power Ladder System24
Electrical System29
Power Ladder Controller29
Rear View Monitor System38
Engine Service Monitor System41
Parking Brake Circuit43
Sensor45
Standard Value Table48
Standard Value Table for Chassis50
Standard Value Table for Electrical System51
Testing and Adjusting52
Inspection and Adjustment of Potentiometer54
Testing and Adjusting54
Ladder Position Calibration Procedure55
Procedure for Testing Diodes57
Troubleshooting58
General Information on Troubleshooting61
Classification and Procedures of Troubleshooting61
Failure Codes Table62
General Information on Troubleshooting62
Fuse Locations64
Troubleshooting by Failure Code66
Failure Code [D1EMKA] (Disconnection of Parking Brake Interlock Relay)66
Failure Code [D1EMKB] (Ground Fault of Parking Brake Interlock Relay)68
Failure Code [D1EMKY] (Hot Short of Parking Brake Interlock Relay)69
Failure Code [D1EPKA] (Disconnection of Ladder Drive Pump Relay)70
Failure Code [D1EPKB] (Ground Fault of Ladder Drive Pump Relay)71
Failure Code [D1EPKY] (Short Circuit of Ladder Drive Pump Relay)72
Failure Code [D1EQKY] (Ladder Operation Alarm Relay Output Hot Short Circuit)73
Failure Code [D1EQKZ]74
Open Circuit, Ground Fault)74
Failure Code [D1ERKB] (Ladder Raise Solenoid Output Ground Fault)75
Failure Code [D1ERKZ]76
Open Circuit, Hot Short Circuit)76
Failure Code [D1ESKB] (Ladder Lower Solenoid Output Ground Fault)77
Failure Code [D1ESKZ]78
Open Circuit, Hot Short Circuit)78
Failure Code [DBL0KR] (Power Ladder Controller CAN-NET Signal Line Open Circuit)79
Failure Code [DBL0KT] (Non-Volatile Memory Write Error)83
Failure Code [DBL1KK] (Power Low Error: Battery Direct)84
Failure Code [DBL2KK] (Solenoid Power Low Error)86
Failure Code [DDB6KZ] (Parking Brake System Abnormality)88
Failure Code [DDDGKY] (Ladder Operation Switch Hot Short Circuit)90
Failure Code [DDDKKY] (Ladder Raise Operation Switch Hot Short Circuit)95
Failure Code [DDDLKY] (Ladder Lower Operation Switch Hot Short Circuit)96
Failure Code [DK5VKX] (Ladder Angle Sensor Abnormality: out of Range)98
Failure Code [DK5VMA] (Power Ladder System Abnormality)100
Failure Code [DUM9KY] (Ladder Indicator Output Hot Short Circuit)103
Failure Code [DUM9KZ] (Ladder Indicator Output Abnormality: Open Circuit, Hot Short Circuit)40104
Failure Code [DV00KY] (Ladder Interlock Caution Output Hot Short Circuit)105
Failure Code [DV00KZ]106
Open Circuit, Ground Fault)106
Failure Code [DWNLKA] (Ladder Cushion Valve Output Open Circuit)107
Failure Code [DWNLKB] (Ladder Cushion Valve Output Ground Fault)108
Failure Code [DWNLKY] (Ladder Cushion Valve Output Hot Short Circuit)109
Troubleshooting of Electrical System (E-Mode)110
Power Ladder Does Not Operate110
Brake Oil Temperature Warning Keeps Lighting113
Parking Brake Does Not Operate (as Emergency Brake)115
Parking Brake Is Applied While Machine Is Traveling119
Parking Brake Is Released as Starting Switch Is Turned to on Position122
Troubleshooting of Hydraulic and Mechanical System (H-Mode)124
Power Ladder Does Not Move or Its Speed Is Low124
Fan of ADD Cooler Does Not Rotate125
Troubleshooting of Maintenance Monitor System (K Mode)126
Maintenance Monitor System126
Hydraulic Oil Level Gauge Flashes128
Troubleshooting for Machine Monitor (M-Mode)131
Rear View Monitor Does Not Operate131
While Clearance Lamp Is Turned On, Illuminance of Rear View Monitor Remains Dark134
Rear View Monitor Does Not Work in Reverse-Interlock Mode135
Illuminance of Rear View Monitor Cannot be Adjusted137
Optional Controller Error and Real-Time Monitor Sreen Are Not Displayed on Engine Service Monitor139
Engine Compartment Lamp Does Not Light up141
Step Lamp Does Not Light up144
Diagrams and Drawings146
Hydraulic Circuit Diagram148
Symbols Used in Hydraulic Circuit Diagram148
Power Train Hydraulic Circuit Diagram152
Brake, Power Ladder and Additional Cooler Hydraulic Circuit Diagram153
Work Equipment Hydraulic Circuit Diagram154
Electrical Circuit Diagram155
Symbols Used in Electric Circuit Diagram155
Electrical Circuit Diagram156
Connector Arrangement Diagram161

Brand	Komatsu
Model	WA900-3E0
Category	Excavators
Language	English

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