Welding Precaution; Electronic Service Tools - Perkins 854F-E34T Troubleshooting Manual

6
Introduction
Troubleshooting
As a reference, simplified schematics for each of the
engine subsystems are included with each of the
circuit tests that are in this manual. For an accurate
representation of the entire electrical schematic that
is for your application, refer to the Electrical System
Schematic.
During troubleshooting, inspect all harness
connections before any component is replaced. If
these connections are not clean and tight, continuous
electrical problems or intermittent electrical problems
can result. Check that the wires are pushed into the
connectors completely. Make sure that the
connections are tight before other tests are made.
Failure of an electrical component may cause the
failure of other components. Always attempt to
correct the cause of an electrical failure before you
replace a component. If wire insulation is punctured,
repair the damage.

Welding Precaution

Correct welding procedures are necessary in order to
avoid damage to the Electronic Control Module
(ECM) , to sensors, and to associated components.
Components for the driven equipment should also be
considered. When possible, remove the component
that requires welding. When welding on an
application that is equipped with an electronically
controlled engine 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
• Electronic control units
This document has been printed from SPI2. NOT FOR RESALE
Do not use electrical components (ECM or ECM sen-
sors) or electronic component grounding points for
grounding the welder.
i05980253
Illustration 1
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.

Electronic Service Tools

Perkins electronic service tools are designed to help
the service technician:
• Retrieve diagnostic codes
• Diagnose electrical problems
• Read parameters
• Program parameters
• Install injector trim codes
UENR0612
NOTICE
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