Komatsu 830E-AC Shop Manual page 359

Dump truck, serial numbers a30001-a30035

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Effective troubleshooting of RF communications sys-

tems can be complex and cannot always be reduced

to a simple check of electrical resistance. However, a

few basic troubleshooting procedures may be helpful

in identifying common problems. The following steps

can help identify a failed coaxial cable. Repair or

replace the cable if any of the following is true:

1. The center conductor is broken. There are more

than two ohms of resistance when measuring

from one end of the coaxial cable to the other.

2. The outer shield is broken.

3. There is an electrical connection between the

center conductor and the outer shield. There

are less than two megohms of resistance when

measuring from the center conductor to the

outer shield.

Table 1: Fault History

Source Voltage Error

Abnormality in VBAT Voltage (VHMS VBAT <10V)

Can-net System (J1939)

VHMS Connector Mismatch

IM Stopped Real Time Data

Too Much Payload Data For Requested Period

PLMIII Stopped Real Time Data

Truck Frame Number Changed

Manual Trigger

VHMS CHECK-OUT & TROUBLESHOOTING

Fault History

The fault history recorded in the VHMS controller can

help identify a failure within VHMS and in the com-

munications network to the engine, interface module

and PLMIII. The VHMS system provides the follow-

ing fault codes.

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