(Table 50, contd)
Troubleshooting Test Steps
Values
Results
3. Cooling Fan
A. Check the operation of the cooling fan.
Note:
A fan that is not turning at the correct speed can result
in insufficient airflow through the aftercooler core.
Cooling fan
Result:
The cooling fan is not operating correctly.
Investigate the cause of the incorrect fan operation
Result:
The cooling fan is operating correctly.
Proceed to Test Step 4.
4. Air Intake and Exhaust System
A. Check the air intake and exhaust system for the following
defects:
· Blockages
· Restrictions
· Damage to the air intake ducts and hoses
· Loose connections and air leaks
Air intake and
exhaust
Result:
The air intake or exhaust system is blocked, restricted,
damaged, or loose.
Make all necessary repairs to the air intake system.
Result:
The air intake and exhaust system is OK.
Proceed to Test Step 5.
5. Ambient Temperature
A. Check for a high ambient temperature.
Note:
When outside temperatures are too high, there is insuffi-
cient temperature difference between the outside air and the
intake air.
Ambient
Temperature
Result:
The ambient air temperature is high.
Operate the engine at reduced speed or reduced power.
Result:
The ambient air temperature is OK.
Proceed to Test Step 6.
6. Altitude
A. Check for operation at high altitude.
Note:
The cooling capacity of the ATAAC is reduced as the
engine is operated at higher altitudes.
Altitude
Result:
The engine is being operated at high altitude.
Operate the engine at reduced speed or reduced power.
Result:
The engine is not being operated at high altitude.
Proceed to Test Step 7.
7. Running Condition
A. Check that the engine is not operating in the lug condition.
Note:
When the load that is applied to the engine is too large,
the engine will run in the lug condition. When the engine is
running in the lug condition, engine rpm does not increase
with an increase of fuel. This lower engine rpm causes a re-
duction in coolant flow through the system.
Running
condition
Result:
The engine is operating in the lug condition.
Reduce the load on the engine or, if possible, increase the
power rating of the engine.
Result:
The engine is not operating in the lug condition.
Contact the Dealer Solution Network (DSN).
i06042298
NRS
Mass
Flow
Rate
Problem
This procedure covers the following diagnostic
trouble code:
104
UENR0612
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