Group 03
General Maintenance and Diagnostic Data
Troubleshooting Guidelines and Procedures
TROUBLESHOOTING GUIDELINES
The troubleshooting procedures that will be encoun-
tered in this manual require that the individual be fa-
miliar with certain policies, requirements, and instruc-
tions before starting any of the procedures. These are
included to assure the safety of the technician per-
forming the tasks, simplify the procedures, and pre-
vent damage to the machine and supporting equip-
ment.
WARNING
All safety precautions for working on and around
powered vehicles must be observed and main-
tained. (Refer to Operating or Repair Manual.)
1.
Initial conditions will be with the vehicle power
OFF and park brake set, unless directed other-
wise.
2.
The Diagnostic Trouble Code (DTC) Chart in-
cludes:
•
Diagnostic Trouble Code
•
A brief description of the fault/symptom
•
Page number of applicable Troubleshoot-
ing Procedures
This number is the number displayed in the Liquid
Crystal Display (LCD) section of the Display
Panel (DP). In addition to active faults that will be
displayed on the LCD, the system is capable of
displaying fault history data that is stored in the
VSM and other controller units, if equipped.
•
VSM Fault Log
•
Traction Controller 1 and 2 Fault Log
•
HYDR PUMP Controller Fault Log
•
LIGHT Controller Fault Log
•
MLM Fault Log
•
IMPACT Fault Log
•
DISPLAY Fault Log
These fault history logs are accessible to service
level technicians. See Troubleshooting Proce-
dures for directions on how to access fault history
logs.
3.
Abbreviations and Acronyms will be defined when
first used in a procedure. They are also listed and
defined in Abbreviations and Acronyms that ac-
companies this document.
4.
Most procedures will require the use of a Digital
MultiMeter (DMM) and associated probes. The
service technician should be familiar with the op-
eration, range scales, polarity selection, and
measurement techniques.
a.
Unless otherwise directed, the
RED
probe of
the DMM will always be connected to the point
indicated as
(+)
and the
BLACK
probe will al-
ways be connected to the point indicated as
(-)
.
b.
When performing a continuity check, all signal
circuits should be equal or less than 0.5 ohms.
At the start of troubleshooting procedures, ver-
ify that the DMM will display 0 ohms when the
resistance scale is selected and the probes are
shorted together. If the DMM display indicates
a value less than 1 ohm and that value is con-
sistently repeated, it may be considered as the
zero value. Resistance readings during testing
will require correction by this small value. If the
DMM display is not correct or is greater than 1
ohm, have the meter calibrated/serviced.
c.
In some improved DMMs, when the test probes
are shorted together, a momentary push-button
switch will re-zero the meter scale and main-
tain that zero position as a reference until the
meter is turned off. If this feature is available,
be sure to re-zero each time meter power is cy-
cled.
Electrical System
General Maintenance and Diagnostic Data
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
Confidential/Proprietary - Do Not Copy or Duplicate
9030-03-1
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