Fault Detection and Reporting
The ECM monitors inputs from the sensors and
inputs from the applications control system. Software
in the ECM interprets the inputs. The software
determines if the inputs are operating correctly. A
diagnostic trouble code is activated when the
software detects a problem with an input.
The ECM broadcasts the codes on two data links.
The data links are the Data Link and CAN data link.
The electronic service tool must communicate on
both data links to service the engine. If a fault is
suspected with the Data Link, refer to
Troubleshooting, “Data Link - Test”.If a fault is
suspected with the CAN data link, refer to
Troubleshooting, “CAN Data Link - Test”.
The codes can be displayed on the electronic service
tool and optional operator interfaces. Refer to
Troubleshooting, “Diagnostic Trouble Codes” for
additional information on diagnostic trouble codes
and a complete list of codes.
Troubleshooting
During troubleshooting, refer to the Electrical System
Schematic for the application.
During troubleshooting, inspect all harness
connections before any component is replaced. If
these connections are not clean and secure,
continuous electrical faults or intermittent electrical
faults 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.
Troubleshooting Associated Codes
Certain systems will display multiple codes for
troubleshooting . The “Associated Codes” must be
used to troubleshoot the system. The codes should
be viewed as separate levels of troubleshooting. For
example, a “DEF Tank Temperature Low” code may
be generated. This main code is not the code that
requires troubleshooting.
The system is designed to display the codes for this
separate level of troubleshooting as an “Associated
Code” . The “Associated Code” is the diagnostic or
the event code that needs to have the
troubleshooting procedure followed.
The following paragraph is an example of
troubleshooting the engine system with
““Associated Codes”” :
After connecting the electronic service tool to an
engine, the following codes are displayed:
• Aftertreatment 1 Diesel Exhaust Fluid Tank
Temperature : Low - moderate severity
• Aftertreatment #1 SCR Catalyst Reagent Tank #1
Heater Coolant Diverter Solenoid : Current Below
Normal
These codes are the result of a diverter valve fault.
The Diesel Exhaust Fluid (DEF) is below the
expected temperature because the diverter valve has
not allowed coolant to circulate through the DEF
tank. The troubleshooting procedure to use in this
case is the “Aftertreatment #1 SCR Catalyst Reagent
Tank #1 Heater Coolant Diverter Solenoid : Current
Below Normal” code, which will fix the other issue.
i05971079
Welding Precaution
Proper welding procedures are necessary in
order to avoid damage to the Electronic Control
Module (ECM), Dosing Control Unit (DCU),
sensors, and associated components. Also
consider components that are for the driven
equipment. 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
provides the minimum amount of 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,
turn the switch to the OFF position.
4. Disconnect all electronic components from the
wiring harnesses. Electronic components include
the following components:
• Electronic components for the driven
equipment
• Engine ECM
• DCU
• Sensors
NOTICE
Do NOT use electrical components (ECM or sensors)
or electronic component grounding points for ground-
ing the welder.
6 UENR4469-36
Introduction
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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