910103-6612 Tohatsu BOLT

Table 1
Diagnostic Trouble Codes for High Intake Manifold Air Temperature
CDL Code Code Description Comments
E539 (1) High Intake Manifold Air Temperature The code indicates that the temperature of the intake air into the engine has risen above a predetermined threshold. The value is obtained from a virtual sensor. For information on virtual sensors, refer to System Operations and Testing and Adjusting.
Engine power may be derated.
E539 (2) High Intake Manifold Air Temperature
E539 (3) High Intake Manifold Air Temperature
Follow the troubleshooting procedure in order to identify the root cause of the problem.
Illustration 1 g02023837
Inspection point
Table 2
Troubleshooting Test Steps Values Results
1. Check the ATAAC for restrictions
A. Inspect the exterior surface of the ATAAC for excessive buildup of dirt or debris. Also verify that the fins of the ATAAC are not damaged.
Restrictions
Result: The ATAAC has an excessive buildup of dirt or debris.
Repair: Clean the ATAAC. Verify that the problem has been resolved.
If the problem still exists, proceed to Test Step 2.
Result: The surface of the ATAAC is damaged.
Repair: Replace the ATAAC.
If the problem still exists, proceed to Test Step 2.
Result: The surface of the ATAAC is not damaged and the ATAAC does not have an excessive buildup of dirt or debris.
Proceed to Test Step 2.
2. Check the Operation of the Cooling Fan
A. Verify that the cooling fan that is being used to transfer heat from the ATAAC is working properly. If the fan is belt driven, verify that the belt tension is adequate. Also, verify that the clutch is operating properly. If the fan is hydraulically driven, verify that there is no leakage around the motor and that the pressure for the fan is adequate.
Cooling Fan
Result: The fan drive system is not working properly.
Repair: Make the necessary adjustments to the clutch or the belt tension if the fan is mechanically driven . Refer to Testing and Adjusting for the proper procedure. Repair leaks or make the necessary adjustments to the motor or the hydraulic pump if the fan is hydraulically driven . Refer to Testing and Adjusting for the proper procedure.
If the problem still exists, proceed to Test Step 3.
Result: The fan drive system is working properly.
Proceed to Test Step 3.
3. Check the Operation of the Intake Manifold Air Temperature Sensor
A. Remove the intake manifold air temperature sensor. Allow the intake manifold air temperature sensor to rest in ambient air for two minutes.
B. Connect to the engine ECM by using Cat ET.
C. Monitor the value of the intake manifold air temperature sensor on Cat ET.
Sensor
Result: The value of the intake manifold air temperature sensor is within −9° C ( 15° F) of the ambient temperature.
Repair: Reinstall the sensor. Torque the sensor to the proper specifications.
Proceed to Test Step 4.
Result: The value of the intake manifold air temperature sensor is not within −9° C ( 15° F) of the ambient temperature.
Repair: Replace the intake manifold air temperature sensor. Return the unit to service.
STOP
4. Altitude of Operation
A. Consider high altitude operation. The cooling capability of the cooling system is reduced at higher altitudes. A pressurized cooling system that is large enough to keep the coolant from boiling must be used. Make sure that the settings for the engine are correct for the altitude.
Altitude
Result: The altitude is normal.
Proceed to Test Step 5.
5. Engine Overload
A. The engine may be running in the lug condition. 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 reduction in coolant flow through the system.
Overload
Result: The engine is overloaded.
Repair: Reduce the load on the engine.
STOP
Test Step 1. The procedure corrected the issue. Return to service.Results:
The procedure did not correct the issue. - Repair: Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).STOP