KENR9126 49
Troubleshooting Section
1. Use the electronic service tool to select the
correct screen
display. Refer to T roubleshooting,
“Troubleshooting with a Diagnostic Code”.
2. If the fault is
not eliminated, refer to “Low
Compression (Cylinder Pressure)”.
Low Compress
ion (Cylinder Pressure)
1. Perform a compression test.
2. If low compression is noted on any cylinders,
investigate the cause and rectify the cause.
Possible causes of low compression are shown
in the following list:
•
Loose glow plugs
•
Faulty pis
ton
•
Faulty piston rings
•
Worn cylinder bores
•
Worn val
ves
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perfor
m all necessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the repair does not eliminate the fault refer to
“Individual Malfunctioning Cylinders”.
Individual Malfunctioning Cylinders
1. With t
he engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
spee
d. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions. If the isolation of a particular cylinder
resu
lts in a reduction of engine speed that is less
than normal. The reduction in engine speed may
indicate that the cylinder is operating below normal
per
formance. Investigate the cause of the fault on
any cylinder that is not operating. Investigate the
cause of the fault on any cylinder that is operating
bel
ow normal performance.
2. Rectify any faults.
3. If all cylinders have been checked and no there
was no problems with the cylinders, proceed to
“E
lectronic Unit Injectors”.
Electronic Unit Injectors
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if
there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated electronic unit injector is not operating
under normal
conditions. If the isolation of a
particular cylinder results in a reduction of engine
speed that is less than normal, this may indicate
that the ele
ctronic unit injector is operating below
normal performance.
2. Remove the e
lectronic unit injector from the
suspect cylinder.
3. Install a n
ew electronic unit injector.
4. Repeat the test in 1. If the fault is still apparent,
remove the
replacement electronic unit injector
and install the original electronic unit injector.
5. If the fau
lt is not eliminated, check for active
diagnostic fault codes.
i04010453
Engine Oil in Cooling System
Note: This is not an electronic system fault.
Probable Causes
•
Engine oil cooler
•
Cylinder head gasket
•
Cylinder head
•
Cylinder block
Recommended Actions
Engine Oil Cooler
1. Drain the coolant from the engine and the radiator.
Drain the lubricating oil from the engine oil cooler.
2. Check for leaks in the oil cooler assembly. If a leak
is found, install a new oil cooler.
Cylinder Head Gasket
1. Remove the cylinder head.
2. Inspect the cylinder head gasket for faults and any
signs of leakage.
3. If necessary, install a new cylinder head gasket.
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