40 KENR6933
Troubleshooting Section
7. If the repairs have not eliminated the faults
proceed to “Thr
ottle Signal for the Speed Demand
Input”.
Signal for the
Speed Demand Input
1. Use the electronic service tool and observe the
signal for the
speed demand input.
2. If the signal is erratic, refer to Troubleshooting,
“Speed Demand
Circuit (Analog) - Test” or refer to
Troubleshooting, “Speed Demand Circuit (Digital)
-Test”.
3. If the fault has not been eliminated, proceed to
“Air Intake and Exhaust System”.
Air Intake and Exhaust System
1. Check the air
filter restriction indicator, if equipped.
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 fault
has not been eliminated, proceed to
“Valve Lash”.
Valve Lash
1. Check the valve lash and reset the valve lash, if
necessary.
Refer to Systems Operation, Testing
and Adjusting, “Engine Valve Lash - Inspect and
Adjust”.
2. If the repair does not eliminate the fault proceed
to “Turbocharger”.
Turbocharger
Note: The t
urbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault exists, except for the wastegate actuator, then
the turboc
harger must be replaced. The wastegate
actuator can be replaced.
1. Ensure th
at the mounting bolts for the turbocharger
are tight.
2. Check that the oil drain for the turbocharger is not
blocked or rest
ricted.
3. Check that the compressor housing for the
turbocharger
is free of dirt, debris and damage.
4. Check that the turbine housing for the turbocharger
is free of dirt
, debris and damage.
5. Check that the turbine blades rotate freely in the
turbocharger
.
6. Ensure that the wastegate on the turbocharger is
adjusted cor
rectly. Refer to Testing and Adjusting,
“Turbocharger - Inspect”. If the wastegate actuator
is faulty, replace the wastegate actuator. Refer
to Disassemb
ly and Assembly, “Turbocharger -
Disassemble” and Disassembly and Assembly,
“Turbocharger - Assemble”.
7. If necessary, replace the turbocharger. Refer
to Disassembly and Assembly, “Turbocharger
- Remove” an
d Disassembly and Assembly,
“Turbocharger - Install”.
8. Check that t
he repairs have eliminated the faults.
9. If the repairs have not eliminated the fault proceed
to “Fuel Sup
ply”.
Fuel Supply
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 position.
3. If the temperature is below 0 °C (32 °F), check
for solidified fuel (wax).
4. Visually inspect the fuel supply lines for
restrictions.
5. Check that the low pressure fuel lines are tight
and secured properly.
6. Remove the fuel filters. Inspect the fuel filters for
contamination. Install new fuel filters. Refer to the
Operatio
n and Maintenance Manual, “Fuel System
Filter- Replace and Fuel System Primary Filter
(Water Separator) Element - Replace”. Determine
the caus
e of the contamination.
7. Check the diesel fuel for contamination. Refer to
Systems
Operation, Testing and Adjusting, “Fuel
Quality - Test”.
8. Check fo
r air in the low pressure fuel system. Refer
to Systems Operation, Testing and Adjusting, “Air
in Fuel - Test”.
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