
(Table 38, contd)
Troubleshooting Test Steps
Values
Results
11. Cooling Fan
Excessive operation of the cooling fan will increase fuel
consumption.
A. Check the operation of the cooling fan.
Cooling fan
Result:
The cooling fan is operating excessively.
Repair or replace the faulty cooling fan components.
Result:
The cooling fan is not operating excessively.
Proceed to Test Step 12.
12. Reduced Pressure of Intake Air
Note:
If the air pressure is lower than normal, the same power
can only be achieved by the following:
· Higher engine speed
· Injection of more fuel
Either of these conditions will increase the fuel consumption.
A. Check all pipes from the outlets of the turbocharger compres-
sor to the inlet manifold for leaks.
B. Check for the correct operation of the wastegate in the turbo-
charger. Refer to Systems Operation, Testing and Adjusting,
“Turbocharger - Inspect”.
Intake air
Result:
There is a leak in the intake air system.
Repair the leak or replace the component that is causing the
leak.
Result:
The turbocharger wastegate is not operating
correctly.
Replace the turbocharger.
Result:
The air intake system and the wastegate are OK.
Proceed to Test Step 13.
13. Valve Lash
Note:
Excessive valve lash will cause a change in the timing of
the opening and closing of the inlet and exhaust valves. Exces-
sive valve lash can cause a reduction of the flow of combustion
air into the engine. Reduced flow of combustion air will increase
the fuel consumption rate.
A. Check the valve lash. Refer to Systems Operation, Testing,
and Adjusting, “Engine Valve Lash - Inspect”.
Valve lash
Result:
The valve lash is excessive.
The hydraulic lifter will compensate for all normal wear of
the components of the valve train.
Repair or replace any excessively worn or damaged compo-
nents of the valve train.
Result:
The valve lash is correct.
Contact the Dealer Solution Network (DSN).
i05667092
Fuel
Contains
Water
This procedure covers the following diagnostic code:
Table 39
Diagnostic Trouble Codes for Fuel Contains Water
J1939
Code
Description
Notes
97-15
Water In Fuel Indicator :
High - least severe (1)
The Electronic Control Module (ECM) detects the presence of water in the fuel for at least 60 seconds.
If equipped, the warning lamp will come on.
The fault will be cleared when no fuel is detected for at least 0.6 seconds.
Note:
Visual identification of water in the bowl may be
impossible. Water may turn dark yellow in color in the
fuel system. The similarity in color would prevent the
ability to differentiate the water from the fuel.
Recommended Actions
Note:
Complete the procedure in the order in which
the steps are listed.
UENR0612
91
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