DISC 1953328 - Caterpillar

Verify that the Fan Drive is ON
The fan drive may be turned ON or the fan drive may be turned OFF through the Electronic Technician (ET). When the Fan drive is ON, the fan drive is in a variable speed mode. When the fan drive is OFF, the fan drive is in the locked up mode. Locking up the fan drive can verify that the fan drive is mechanically sound and hydraulically sound. In order to change the mode of the fan drive, use ET and the procedure that follows:
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Typical view
After connecting with ET, select the engine ECM.
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Typical view
Select the tool configuration icon.
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Typical view
After selecting the tool configuration icon, select the "ECM Configuration Parameters".
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Typical view
Select the "Engine Fan Control" with a double click.
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Typical view
Select the drop-down menu next to the value. Select the "ON" parameter in order to enable the engine fan control. Ensure that the new value reads "ON". Select the "OK" button.
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Typical view
Select "YES" in order to enable the engine fan control.