40 KENR9126
Troubleshooting Section
2. Ensure that the air filter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following defects:
•
Blockages
•
Restriction
s
•
Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. Ensure that the repairs have eliminated the fault.
6. If the faul
t has not been eliminated, proceed to
“Fuel Supply”.
Fuel Suppl
y
1. Visually check the fuel tank for fuel. The fuel
gauge may
be faulty.
2. Ensure that the fuel supply valve is in the full
OPEN pos
ition.
3. If the temperature is below 0 °C (32 °F), check
for soli
dified fuel (wax).
4. Visually inspect the fuel supply lines for
restri
ctions.
5. Check that the low-pressure fuel lines are tight
and sec
ured properly.
6. Remove the fuel filters. Inspect the fuel filters for
conta
mination. Install new fuel filters. Determine
the cause of the contamination.
7. Check
the diesel fuel for contamination.
8. Check for air in the low-pressure fuel system.
9. Ensure that the fuel system has been primed.
10.Chec
k the fuel pressure.
Contact with high pressure fuel may cause fluid
penetration and burn hazards. High pressure fu-
el spray may cause a fire hazard. Failure to fol-
low these inspection, maintenance a nd service in-
structions may cause personal injury or death.
NOTICE
Contact with high pressure fuel may cause personal
i
njury or death. Wait 60 seconds after the engine has
stopped to allow fuel pressure to purge before any
service o r repair is performed on the engine fuel lines.
11. If the high-pressure fuel lines have a leak, the
high-pressure
fuel lines must be replaced.
12. If the repairs do not eliminate the fault, proceed to
“Individual M
alfunctioning Cylinders”.
Individual Malfunctioning Cylinders
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
atime.Note
if there is any reduction in engine
speed. 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
results in a reduction of engine speed that is less
than normal, this may indicate that the cylinder is
operating
below normal performance. Investigate
the cause of the fault on any cylinder that is
not operating. Investigate the cause of the fault
on any cyli
nder that is operating below normal
performance.
2. If all cyl
inders have been checked and no faults
were detected, proceed to “Electronic 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
partic
ular cylinder results in a reduction of engine
speed that is less than normal, this may indicate
that the electronic unit injector is operating below
norma
l performance.
2. Remove the electronic unit injector from the
suspe
ct cylinder.
3. Install a new electronic unit injector.
4. Repeat the test in 1. If the fault is still apparent,
remove the replacement electronic unit injector
and i
nstall the original electronic unit injector.
5. If the fault is still apparent, carefully repeat the
dia
gnostic process from the beginning.
i04010435
Coolant in Eng ine Oil
Note: This is not an electronic system fault.
Probable Causes
•
Engine oil cooler
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