troubleshootig guide
TRANSCRIPT
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From the factory the 320D-329D machines installed with the viscous clutch forLACD are only and should ONLY be configured to High Ambient.
Configuration Settings
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Visconic Demand Fan Operation
Fan Speed is controlled by theECM using the following inputs:
- Engine coolant temperature- Hydraulic oil temperature- Ambient air temperature
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NOTE: The first 150 seconds are controlled by changing the “Fan Motor Current
Percentage” parameter. The last 150 seconds are controlled by changing the “FanMotor Speed” parameter.
Data View Showing Override Controls
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The visconic fan clutch assembly cannot becalibrated. If a calibration is attempted with thisunit installed, an error message similar to the oneon the left will appear.
Although the “Fan Motor CurrentPercentage” or “Coolant Fan SolenoidCurrent Percentage” can be adjusted in theoverride menu, the parameter has no valueduring normal operation. The value willdefault to zero and should be ignored.
Parameter Notes
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Measure the resistance across the coil low pin (3)and the coil high pin (4). The resistance shouldmeasure 30 ohms (+/- 10%).
1
2
3
5
4
Ω
R = 30 Ω (+/-10%)
Verification of the Coil Function
1
2
3
5
4
Ω
R = ∞
Measure the resistance across the coil low pin (3)
and all other pins as well as the coil housing. Theresistance should be infinite.
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1
2
3
5
4
Ω
R = ∞
Verification of the Coil Function (cont)
Measure the resistance across the coil high pin(4) and all other pins as well as the coil housing.
The resistance should be infinite.
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Verification of the Speed Sensor
Measure the resistance across the fan speedoutput pin (1) and the fan speed ground pin
(2). The resistance The resistance shouldmeasure 15 kohms (+/- 10%).
1
2
3
5
4
Ω
R = 15 k Ω (1+-10%)
1
2
3
5
4
A
Ityp = 6 mA … 12 mA
U=5 V
Measure the current draw between the fanspeed supply pin (5) and the fan speed ground
pin (2). This will require a DC voltage supplyof 5 volts. The current should measure
between 6 mAmps and 12 mAmps.