WASHER 0923973 - Caterpillar

Cat ET Screens for the Visconic Cooling Demand Fan
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Cooling fan status screenThe status of the fan control system can be monitored using Cat ET.
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Cooling fan configuration screenAfter connecting Cat ET, go to the configuration screen. Under "Machine Control", open up the "Machine Attachments" parameters in order to view the four parameters of the cooling fan.The "Engine Cooling Map" parameter can be changed on all machines. This parameter requires a factory password in order to change the parameter.
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Hex configuration screenIn Cat ET, one of four different cooling fan maps can be selected. The cooling maps are controlled by the software. Fan maps are created so that factories can select the fan map that is best suited for that marketing region. The 320D through 329D models for North America are configured to "High Ambient Temperature". Always use this configuration.The 320D through 329D models for Europe and the Middle East are configured to "High Ambient Temperature" and "Low Noise". Machines for the Japanese market are configured to "Standard" and "Low Noise".Note: The standard cooling map is being not used by the factories.Note: The technician should never be required to change the cooling map. This parameter is used by the factory. A factory password is required to change the cooling map.
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Cooling fan factory password screen
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Cooling fan override parameters screenThere are two parameters of the cooling fan that can be overridden on the "Override Parameter" screen. Overrides can be used to vary the performance of the viscous fan.
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Monitor demand fan screenThe "Override" submenu and the "Calibration" submenu can be displayed from the "Service" menu. Overrides for the fan can be selected from the "Override" screen.Two overrides of the fan motor are used to vary the performance of the viscous fan. The two overrides are "Motor Speed" and "Fan Motor Current Percentage".Calibrations of the fan can be selected from the "Calibration" menu. If a calibration is attempted, an error code will result.Troubleshooting Guidelines
Note: Complete all test while the engine at operating temperature.
Ensure that the configuration settings are correct.
Ensure the ECM is receiving the input signal from the engine coolant temperature sensor, hydraulic oil temperature sensor, and the ambient air temperature sensor.
Test for wiring continuity between the wiring harness on the visconic fan and the ECM.
Ensure pin 5 on the visconic fan wiring harness is receiving a constant voltage of 5 VDC.
Verify that the fan can be manually overridden through the service menu.
Complete testing of the fan coil and the fan speed sensor.
Unplug the fan assembly and ensure the fan defaults to high speed.
Measure the fan speed with a phototach. Compare the results of the desired fan speed and the actual fan speed as reported by the ECM.
Verify the correct belt and the correct pulley. Refer to "Machine Configuration" for the correct parts for the machine.
Measure the fan pulley speed with a phototach. Compare the results to the actual engine rpm. The ratio of fan pulley speed to engine speed will vary depending on the fan pulley installed on