KENR6933 43
Troubleshooting Section
Coolant Level
1. Inspect the coolant level. If necessary, add
coolant.
2. Check the cooling system for leaks. Repair any
leaks immediately.
Radiator Cap and/or Pressure Relief
Valve
1. Pressure test the cooling system. Refer to Testing
and Adjusting, “Cooling System” for the correct
procedure.
2. Check that the seating surfaces of the pressure
relief valve
and the radiator cap are clean and
undamaged.
3. Check operat
ion of the pressure relief valve
and/or the radiator cap. If necessary, clean the
components and/or replace the components.
Coolant Temperature Gauge
Compare the
reading for the coolant temperature
from the electronic service tool to the reading for the
coolant temperature from a calibrated test gauge.
Restriction in the Coolant System
1. Visually in
spect the cooling system for collapsed
hoses and/or other restrictions.
2. Clean the r
adiator and flush the radiator. Refer to
Testing and Adjusting, “Cooling System”.
Water T emp
erature Regulator
Check the water temperature regulator for correct
operation
. Refer to Testing and Adjusting, “Cooling
System” for the proper procedure. If necessary,
replace the water temperature regulator. Refer to
Disassemb
ly and Assembly, “Water Temperature
Regulator - Remove and Install” for more information.
Engine Co
oling Fan
1. Make sure that the engine cooling fan is correctly
installe
d.
2. Make sure that the engine cooling fan is being
driven co
rrectly by the drive belt. If necessary,
tighten the drive belt or replace the drive belt.
Refer to Disassembly and Assembly, “Alternator
Belt - Re
move and Install”.
3. Check the engine cooling fan for damage. If
necessa
ry, replace the fan. Refer to Disassembly
and Assembly, “Fan - Remove and Install”.
Coolant Pump
1. Inspect the impeller of the coolant pump for
damage and/or erosion.
2. Make sure that the drive gear is not loose on the
drive shaft of the coolant pump.
3. If necessary, replace the coolant pump. Refer
to Disassembly and Assembly, “Water Pump -
Remove” and Di
sassembly and Assembly, “Water
Pump - Install”.
Cylinder Hea
d Gasket
Switch off the engine and allow the engine to cool
to below norm
al working temperature. Remove
the pressure cap for the coolant system. Start the
engine and inspect the coolant for the presence
of bubbles. I
f bubbles are present in the coolant,
combustion gases may be entering the cooling
system. Check the cylinder head gasket. Refer to the
recommende
d action for the cylinder head gasket
within Troubleshooting, “Coolant in Engine Oil”.
Check the cylinder head for flatness. Refer to the
recommend
ed action for checking flatness of the
cylinder head within Systems Operations, “Cylinder
Head - Inspect”. Fit the pressure cap if there are no
bubbles in
the coolant.
i02413819
ECM Will No
tAcceptFactory
Passwords
Probable
Causes
One of the following items may not be recorded
correctl
y on the electronic service tool:
•
Passwords
•
Serial numbers
•
Tota l t a t
tletale
•
Reason code
Recommended Actions
1. Verify that the correct passwords were entered.
Check every character in each password. Remove
the elect
rical power from the engine for 30
seconds and then retry.
2. Verify t
hat the electronic service tool is on the
“Factory Password” screen.
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