BEARING 3J6494 - Caterpillar

This procedure covers the following diagnostic codes:
Table 1
Diagnostic Trouble Codes
J1939 Code CDL Code Code Description
(code descriptions may vary) Comments
1636-15 E539(1) Engine Intake Manifold #1 Air Temperature : High - least severe (1) The Electronic Control Module (ECM) detects a problem with the engine intake manifold air temperature.
The event code will be logged.
There are no performance effects.
1636-16 E539(2) Engine Intake Manifold #1 Air Temperature : High - moderate severity (2) The Electronic Control Module (ECM) detects a problem with the engine intake manifold air temperature.
The event code will be logged.
The engine power will be derated.
Intake manifold air temperature can be high for the following reasons:
High ambient air temperature
High inlet air restriction and/or high altitude
Restriction in the exhaust system
Faulty inlet air temperature sensor and/or circuit
Table 2
Troubleshooting Test Steps Values Results
1. Check for High Ambient Air Temperature
A. Determine if the ambient air temperature is within the design specifications for the inlet air system.
Note: When ambient temperatures are too high for the rating of the inlet air system, there is not enough of a temperature difference between the ambient air and inlet air temperatures.
Ambient air temperature
Results: The ambient air temperature is too high.
Repair: Determine the cause of the high inlet air temperature. Correct the situation, when possible.
Results: The ambient air temperature is OK.
Proceed to Test Step 2.
2. Check for High Inlet Air Restriction and/or High Altitude Operation
Note: When inlet air pressure is low, the turbocharger works harder in order to achieve the desired inlet manifold pressure. This increases inlet air temperature.
A. Check for plugged air filters. Check for obstructions to the air inlet. A restriction of the air that enters the engine can cause high cylinder temperatures. High cylinder temperatures cause higher than normal temperatures in the cooling system.
B. Consider high altitude operation. The cooling capability of the cooling system is reduced at higher altitudes.
High Inlet Air Restriction and/or High Altitude Operation
Results: The air filter is plugged. There is a restriction in the air inlet.
Repair: Replace the air filters and/or remove the obstruction from the air inlet.
Results: The engine is operating at high altitude.
Repair: A pressurized cooling system that has been designed for the higher altitudes must be used. Ensure that the engine is configured for high altitude operation.
Results: The air inlet is OK. The engine is not operating at high altitude.
Proceed to Test Step 3.
3. Check for Exhaust System Restriction
A. Check for a restriction in the exhaust system.
Note: A restriction of the air that is coming out of the engine can cause high cylinder temperatures.
Exhaust system restriction
Results: The exhaust system is restricted.
Repair: Rectify the cause of the restriction.
Results: The exhaust system is OK.
Repair: Contact the Dealer Solutions Network (DSN)