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Intake Manifold Air
Temperature
Is
High
The Electronic Control Module (ECM) monitors the
intake manifold air for excessive temperature.
Use this procedure to determine the cause of high
intake manifold air temperature.
Probable Causes
• Coolant level
• Air-to-air aftercooler (ATAAC)
• Cooling fan
• Air inlet and exhaust system
• Ambient temperature
• Altitude
• Running condition
Recommended Actions
Note:
The procedures have been listed in order of
probability. Complete the procedures in order.
Table 50
Troubleshooting Test Steps
Values
Results
1. Coolant Level
A. Check that the coolant is filled to the correct level.
Note:
If the coolant level is too low, air will get into the cooling
system. Air in the cooling system will cause a reduction in
coolant flow.
Coolant
Result:
The coolant level is low.
Fill the coolant system to the correct level. Refer to the Opera-
tion and Maintenance Manual, “Coolant Level - Check”.
Result:
The coolant level is OK.
Proceed to Test Step 2.
2. Air-to-Air Aftercooler (ATAAC)
A. Check the ATAAC for debris or damage.
Note:
Debris between the fins of the ATAAC core restricts air
flow through the core.
ATAAC
Result:
The ATAAC has excessive debris or is damaged.
Clear the debris from the ATAAC or replace the ATAAC.
Result:
The ATAAC is OK.
Proceed to Test Step 3.
(continued)
UENR0612
103
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