KENR6933 55
Troubleshooting Section
•
Check for the correct software
2. Use the electronic service tool to verify any active
diagnostic codes.
3. If diagnostic codes are present, the Electronic
Control Module (ECM) must be programmed with
the correct in
formation.
4. If the repairs have not eliminated the fault proceed
to “Air Intak e
System or Exhaust System”.
Air Intake System or Exhaust System
1. Check the air filter restriction indicator, if equipped.
2. Ensure that th
eairfilter is clean and serviceable.
3. Check the air intake and the exhaust system for
the following
defects:
•
Blockages
•
Restrictions
•
Damage to the
air intake and exhaust lines and
hoses
4. Make all nece
ssary repairs to the engine.
5. If the fault has not been eliminated, proceed to
“Valve Lash”
.
Valve Lash
Ensure that the valve lash is correct. Reset the valve
lash if it is not correct. Refer to Testing and Adjusting,
“Engine Val
ve Lash - Inspect/Adjust”.
If the repair does not eliminate the fault proceed to
“Turbochar
ger”.
Turbocharger
Note: The turbocharger that is installed on this
engine is a nonserviceable item. If any mechanical
fault exist
s, except for the wastegate actuator, then
the turbocharger must be replaced. The wastegate
actuator can be replaced.
1. Ensure that the mounting bolts for the turbocharger
are tight.
2. Check that the oil drain for the turbocharger is not
blocked or restricted.
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 corr
ectly. Refer to Testing and Adjusting,
“Wastegate - 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” and
Disassembly and Assembly,
“Turbocharger - Install”.
8. Check that th
e repairs have eliminated the faults.
9. If the repairs have not eliminated the fault proceed
to “Low Comp
ression (Cylinder Pressure)”.
Low Compression (Cylinder Pressure)
1. Perform a compression test. Refer to Testing and
Adjusting, “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 pi st
on
•
Faulty piston rings
•
Worn cylinder bores
•
Worn valve
s
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perform al
l necessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the repair does not eliminate the fault refer to
“Individual Malfunctioning Cylinder”.
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