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Komatsu WA320-7 Shop Manual page 7

Wheel loader

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Testing and adjusting bucket positioner and bucket proximity switch....................................... 30-93
Testing and adjusting boom position detection lever .............................................................. 30-95
Electrical system ...................................................................................................................... 30-96
Adjusting replaced, reassembled or added sensor, controller, etc. with machine
monitor ................................................................................................................ 30-96
Special functions of machine monitor ................................................................................... 30-97
Adjusting rearview camera angle ....................................................................................... 30-176
Handling voltage circuit of engine controller........................................................................ 30-177
Handling battery disconnect switch .................................................................................... 30-178
Testing diodes ................................................................................................................. 30-179
Pm clinic ................................................................................................................................ 30-180
Pm Clinic service ............................................................................................................. 30-180
Check sheet .................................................................................................................... 30-181
40 Troubleshooting............................................................................................................................ 40-1
Table of contents ........................................................................................................................ 40-2
Related information on troubleshooting....................................................................................... 40-10
Troubleshooting points ....................................................................................................... 40-10
Sequence of events in troubleshooting................................................................................. 40-12
Checks before troubleshooting ............................................................................................ 40-14
Inspection procedure before troubleshooting ........................................................................ 40-16
Preparation for troubleshooting of electrical system............................................................... 40-33
Classification and procedures for troubleshooting ................................................................. 40-39
Symptom and troubleshooting numbers ............................................................................... 40-42
Information in troubleshooting table ..................................................................................... 40-45
Procedure for troubleshooting wiring harness of pressure sensor system for open
circuit................................................................................................................... 40-47
Connector list and layout .................................................................................................... 40-50
Connector contact identification........................................................................................... 40-64
T-branch box and T-branch adapter table ........................................................................... 40-103
Fuse location table ........................................................................................................... 40-108
Precautions for KDPF (KCSF and KDOC) Cleaning and Replacement ..................................40-111
Precautions when performing troubleshooting of machine monitor........................................ 40-114
Processing procedure of harness checker for troubleshooting of machine monitor LCD
unit .................................................................................................................... 40-116
Preparation of dummy temperature sensor (for KDOC and KDPF temperature
sensors)............................................................................................................. 40-121
Preparation of short circuit electrical connector (for failure codes [CA1883] and
[CA3135]) .......................................................................................................... 40-122
Failure codes table........................................................................................................... 40-123
Troubleshooting by failure code (Display of code) ...................................................................... 40-135
Failure code [2F00MA] Failure of Parking Brake Circuit ....................................................... 40-135
Failure code [2F00MB] Malfunction of Parking Brake .......................................................... 40-138
Failure code [2G42ZG] Accumulator Oil Pressure Low (Front) ............................................. 40-140
Failure code [2G43ZG] Accumulator Oil Pressure Low (Rear) .............................................. 40-142
Failure code [6091NX] HST Oil Filter Clogging ................................................................... 40-144
Failure code [7RHYKA] Disconnection of Fan Variable Control Sol. ...................................... 40-146
Failure code [7RHYKB] Ground Fault of Fan Variable Control Sol......................................... 40-148
Failure code [7RHYKY] Hot Short of Fan Variable Control Sol. ............................................. 40-150
Failure code [879AKA] A/C Inner Sensor Open Circuit ........................................................ 40-152
Failure code [879AKB] A/C Inner Sensor Short Circuit......................................................... 40-153
Failure code [879BKA] A/C Outer Sensor Open Circuit........................................................ 40-154
Failure code [879BKB] A/C Outer Sensor Short Circuit ........................................................ 40-155
Failure code [879CKA] Ventilating Sensor Open Circuit ....................................................... 40-156
Failure code [879CKB] Ventilating Sensor Short Circuit ....................................................... 40-157
Failure code [879DKZ] Sunlight Sensor Open or Short Circuit .............................................. 40-158
Failure code [879EMC] Ventilation Damper Abnormality ...................................................... 40-159
Failure code [879FMC] Air Mix Damper Abnormality ........................................................... 40-160
Failure code [989L00] Engine Controller Lock Caution 1...................................................... 40-161
Failure code [989M00] Engine Controller Lock Caution 2..................................................... 40-162
WA320-7
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00 Index and foreword
Index
00-5

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