Troubleshooting Section
Electronic Troubleshooting
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Welding Precaution
Correct welding procedures are necessary in order to
avoid damage to the following components:
• Electronic Control Module (ECM) on the engine
• Sensors
• Associated components
Components for the driven equipment should also be
considered. When possible, remove the component
that requires welding. When welding on an engine
that is equipped with an ECM and removal of the
component is not possible, the following procedure
must be followed. This procedure minimizes the risk
to the electronic components.
1.
Stop the engine. Remove the electrical power from
the ECM.
2.
Ensure that the fuel supply to the engine is turned
off.
3.
Disconnect the negative battery cable from the
battery. If a battery disconnect switch is installed,
open the switch.
4.
Disconnect all electronic components from the
wiring harnesses. Include the following
components:
• Electronic components for the driven equipment
• ECM
• Sensors
• Electronically controlled valves
• Relays
NOTICE
Do not use electrical components (ECM or ECM sen-
sors) or electronic component grounding points for
grounding the welder.
Illustration 1
g01143634
Service welding guide (typical diagram)
5.
When possible, connect the ground clamp for the
welding equipment directly to the engine
component that will be welded. Place the clamp as
close as possible to the weld. Close positioning
reduces the risk of welding current damage to the
engine bearings, to the electrical components, and
to other components.
6.
Protect the wiring harnesses from welding debris
and/or from welding spatter.
7.
Use standard welding procedures to weld the
materials together.
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System Overview
The engine has an electronic control system. The
system controls the engine.
The control system consists of the following
components:
• Electronic Control Module (ECM)
• Software (flash file)
• Wiring
• Sensors
• Actuators
The following information provides a general
description of the control system. Refer to Systems
Operation, Testing, and Adjusting for detailed
information about the control system.
UENR0678
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