64 KENR9126
Troubleshooting Section
Throttle S igna l
Monitor the status for “Throttle Position” on the
electronic service tool. Verify that the status for
“Throttle Pos
ition” is stable and that the engine is
able to reach high idle speed.
Air Intake an
d Exhaust System
1. Check the air filter restriction indicator, if equipped.
2. Ensure that the air filter is clean and serviceable.
3. Check the ai
r intake and the exhaust system for
the following defects:
•
Blockages
•
Restrictions
•
Damage to the air intake and exhaust lines and
hoses
4. Make all necessary repairs to the engine.
5. If the fa
ult has not been eliminated, proceed to
“Valve Lash”.
Valve La
sh
1. Check the valve lash and reset the valve lash, if
necess
ary.
2. If the repair does not eliminate the fault proceed
to “Tur
bocharger”.
Turbocharger
Note: The turbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault
exists, then the turbocharger must be replaced.
1. Ensure that the mounting bolts for the turbocharger
are t
ight.
2. Check that the oil drain for the turbocharger is not
bloc
ked or restricted.
3. Check that the compressor housing for the
tur
bocharger is free of dirt and debris.
4. Check that the turbine housing for the turbocharger
is f
ree of dirt and debris.
5. Check that the turbine blades rotate freely in the
tu
rbocharger.
6. Ensure that the wastegate on the turbocharger is
ad
justed correctly. If the wastegate actuator or the
turbocharger is faulty, replace the turbocharger.
7
.
C
heck that the repairs have eliminated the faults.
8. If the fault has not been eliminated, proceed to
“Fuel Supply”.
Fuel Supply
1. Visually check the fuel tank for fuel. The fuel
gauge may be faulty.
2. Ensure that the fuel supply valve (if equipped) is
in the full OPEN position.
3. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
4. Check the primary filter/water separator for water
in the fuel.
5. Check for fuel supply lines that are restricted.
6. Check that
the low-pressure fuel lines are tight
and secured properly.
7. Check the
fuel filters.
8. Check the diesel fuel for contamination.
9. Check for air in the fuel system.
10. Ensure t
hat the fuel system has been primed.
11. Check the fuel pressure.
12. If the repair does not eliminate the fault refer to
“Low Compression (Cylinder Pressure)”.
Low Compression (Cylinder Pressure)
1. Perfo
rm a compression test.
2. If low compression is noted on any cylinders,
inves
tigate the cause and rectify any faults.
Possible causes of low compression are shown
in th
efollowinglist:
•
Loose glow plugs
•
Faulty piston
•
Fau
lty piston rings
•
Worn cylinder bores
•
Worn valves
•
Fa
ulty cylinder head gasket
•
Damaged cylinder head
3. Perform all necessary repairs.
4
.
E
nsure that the repairs have eliminated the faults.
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