Cylinder Cutout Test
The cylinder cutout test allows one cylinder or
multiple cylinders to be cut out. The cylinder cutout
test is useful when troubleshooting poor engine
performance or a suspected injector failure
The process involves cutting out power and restoring
power to a selected cylinder. The remaining powered
cylinders are then monitored for expected increases
in delivered fuel volume. If the fuel volume does not
increase, the cylinder that was not powered was not
working prior to being cut out for the test.
A cylinder that is not working means that the power
produced by that cylinder is comparatively less than
the other cylinders. This fault can have numerous
root causes relating to the cylinder including the
injector, valves, and piston.
The cylinder cutout test can be performed on one
injector or multiple injectors at once. This function
provides a way to identify misfiring cylinders when
the engine is running.
Wiggle Test
The purpose of the Wiggle Test is to detect
intermittent electrical faults in electronic control
systems. The Wiggle Test function allows the user to
determine if there is an intermittent wiring fault. The
test will indicate (by changing the value reading)
which parameter moved beyond a predetermined
range when wiggling the wiring harness, sensor, or
connector.
This test requires that the engine is OFF and the key
switch is in the ON position (or ECM energized and 0
engine speed). If the engine is started with the wiggle
test active, the wiggle test will abort.
The Wiggle Test will reduce all ECM requirements to
trip fault codes, making the diagnostics sensitive.
Under normal operation some fault codes need
multiple occurrences before the code will log. But
during this test the fault codes will trip the first time.
The technician must wiggle and shake the wiring to
check if codes go active. If any parameter changes
state electrically, an audible alarm is also activated.
Once the test has ended, the ECM returns to normal
diagnostic trip requirements.
DPF Soot Loading Sensor Functional
Test
Note: This test is only applicable to engines that
have a DPF in the aftertreatment system.
This test is used to determine if the mean soot level is
within range.
Fuel Rail Pressure Relief Valve Test
The purpose of this test is check that the opening
pressure for the pressure relief valve is above
220 MPa (31900 psi). The engine speed is
automatically increased above a minimum threshold
when this test is run. The rail pressure is then
increased to 220 MPa (31900 psi). After a short time,
the rail pressure is reduced to normal.
Fuel Rail Pressure Test
The purpose of this test is to check the integrity of the
high-pressure fuel system after work has been
completed. The test can also help with
troubleshooting general fuel system-related issues.
The engine speed is automatically increased above a
minimum threshold when this test is run. The rail
pressure is increased to 220 MPa (31900 psi) and
held at this pressure for a time. The rail pressure is
then reduced to normal. If the check is for system
integrity after work, the engine must be stopped
before inspecting the high-pressure fuel system for
fuel leaks. If the reason for the test is troubleshooting
general fuel system-related issues, check for error
codes. Any error codes that occur during the test
should be used to provide guidance for
troubleshooting.
Aftertreatment Regeneration System Test
Note: This test is only applicable to engines that
have a DPF in the aftertreatment system.
Avoid contact with hot surfaces. Exhaust piping
and engine components become hot during en-
gine operation and cool slowly after engine shut-
down. Any contact with hot surfaces can cause
severe burns.
This test must be run with the engine running but not
under load. The engine must reach a minimum
coolant temperature. Once the conditions are met,
engine speed and load must be reduced to the
minimum level that can be achieved with the engine/
equipment configuration.
The ECM software performs the necessary checks to
ensure that the test runs under the required
conditions. If the test aborts before completion, the
electronic service tool displays any relevant error
identifiers.
The following conditions must be met before the
Aftertreatment Regeneration System Test can begin:
• No related active diagnostic codes
• Coolant at the minimum required temperature
• Engine speed and load in the required range
UENR4469-36 457
Service
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