42 KENR9126
Troubleshooting Section
Restriction in t he Coolant System
1. Visually inspect the cooling system for collapsed
hoses and/or other restrictions.
2. Clean the radiator and flush the radiator.
Water Temper
ature Regulator
Check the water temperature regulator for
correct ope
ration. If necessary, replace the water
temperature regulator.
Coolant Pum
p
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 shaf
t of the coolant pump.
3. If necessary, replace the coolant pump.
Auxiliary Coolant Pump (if equipped)
1. Inspect
the impeller of the auxiliary coolant pump
for damage and/or erosion.
2. Make sur
e that the drive gear is not loose on the
drive shaft of the auxiliary coolant pump.
3. If nece
ssary, replace the auxiliary coolant pump.
Cylinder Head Gasket
Switch off the engine and allow the engine to cool
to below normal working temperature. Remove the
press
ure relief valve for the coolant system. Start
the engine and inspect the coolant for the presence
of bubbles. If bubbles are present in the coolant,
combu
stion gases may be entering the cooling
system. Check the cylinder head gasket. Refer
to the recommended action for the cylinder head
gask
et within Tr oubleshooting, “Coolant in Engine
Oil”. Check the cylinder head for flatness. Install the
pressure relief valve if there are no bubbles in the
cool
ant.
i03807570
ECM
Will Not Accept Factory
Passwords
Pr
obable Causes
One of the following items may not be recorded
co
rrectly on the electronic service tool:
•
Passwords
•
Serial numbers
•
Total tattlet
ale
•
Reason code
Recommended Actions
1. Verify that the correct passwords were entered.
Check every character in each password. Remove
the electri
cal power from the engine for 30
seconds and then retry.
2. Verify that
the electronic service tool is displaying
the “Factory Password” screen.
3. Use the ele
ctronic service tool to verify that the
following information has been entered correctly:
•
Engine se
rial number
•
Serial number for the electronic control module
•
Serial number for the electronic service tool
•
Total ta
ttletale
•
Reason code
i04022
030
ECMWillNotCommunicate
with Ot
her Systems or Display
Modules
Proba
ble Causes
•
Electrical connectors
•
Electronic Control Module (ECM)
Recommended Actions
1. Con
nect the electronic service tool to the
diagnostic connector. If the ECM does not
communicate with the electronic service tool, refer
to T
roubleshooting, “Electronic Service Tool Will
Not Communicate with ECM”.
2. En
sure that the following items are
correctly installed and undamaged. Refer
to Troubleshooting, “Electrical Connectors -
In
spect”.
•
P1/J1 and P2/J2 connectors on the ECM
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