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HOW TO PROGRAMMING ENGINE COOLING FAN FOR CATERPILLAR ON-HIGHWAY TRUCKS
Figure 1.1 - Cooling Fan Drive and Clutch (C13 Truck)
(A). Accessing the Configuration on CAT ET software – Input Selections and Output Selections:
1). Fan Control Type
The Fan Control Type parameter determines if the ECM is used to operate the Engine Cooling Fan, this parameter must be programmed to "On/Off", to "Three-Speed Fan", or to "Variable Speed Fan Option S". This parameter must be programmed to "None" if the ECM is not operating the Cooling Fan relay or the Cooling Fan Solenoid.
Figure 1.2 - Fan Control Type
#Alternatives:
→None
→On/Off PWM
→On/Off DC
→Three-Speed Fan PWM
#Advantages:
When the Engine ECM controls the Engine Cooling Fan, there is no need for second set of Coolant Temperature Sensors. Engine ECM fan control also provides additional features, such as Fan with Engine Retarder in High Mode.
Figure 1.3 - Engine Fan Clutch Solenoid
2). Fan Override Switch
The Fan Override Switch parameter is programmed to identify the Fan Override Switch connection to the ECM. This parameter can be programmed to one of the available hard-wired options or J1939 data-link source inputs. The switch itself allows the Operator to turn on the Cooling Fan at any time, resulting in improved retarding/braking and Engine cooling.
Figure 1.4 - Fan Override Switch
#Alternatives:
→None
→J1/P1:7 (Input 4)
→J1/P1:47 (Input 5)
→J1/P1:6 (Input 6)
→J1/P1:46 (Input 7)
→J1939 - Body Controller
→J1939 - Cab Controller
→J1939 - Instrument Cluster
#Advantages:
When programmed to one of the input Alternatives, this parameter allows the use of the Fan Override Switch, which results in improved Engine retarding/braking and Engine cooling.
Figure 1.5 - Engine Fan Auto/Manual Switch
(B). Accessing Diagnostic Tests from the Diagnostic menu, and then select Special Tests from the submenu. Click Start.
Figure 1.6 - Special Tests
→Select On/Off Cooling Fan - J1/P1:11. Click Start.
Figure 1.7 - On/Off Cooling Fan - J1/P1:11 (Not Active)
→Check the Engine Fan Clutch Solenoid should be activated now.
Figure 1.8 - On/Off Cooling Fan - J1/P1:11 (Active)
→Click Stop button to stop the selected special test in progress.
(C). Accessing the Status Tool to check the circuit for the Engine Cooling Fan:
#Key switch ON
Figure 1.9 - Key switch ON
→Engine Speed = 0 rpm
→Cooling Fan = Fan On
→On/Off Fan Output - J1/P1:11 = Off
→Engine Coolant Temperature = 91 Deg F
→Fan Override Switch - J1/P1:7 = Off
#Starts the Engine (Idle Speed) - Engine Fan Auto/Manual Switch OFF (to Auto Mode)
Figure 2.1 - Engine Run (Idle Speed)
→Engine Speed = 701 rpm
→Cooling Fan = Fan Off → Disengaged
→On/Off Fan Output - J1/P1:11 = On
→Engine Coolant Temperature = 93 Deg F
→Fan Override Switch - J1/P1:7 = Off
#Engine Run (Idle Speed) - Engine Fan Auto/Manual Switch ON (to Manual Mode)
Figure 2.2 - Fan Override Switch (On)
→Engine Speed = 701 rpm
→Cooling Fan = Fan On → Engaged
→On/Off Fan Output - J1/P1:11 = Off
→Engine Coolant Temperature = 95 Deg F
→Fan Override Switch - J1/P1:7 = On
#Engine Run (Idle Speed) - Engine Fan Auto/Manual Switch OFF (to Auto Mode) - Simulate the Engine Coolant Temperature (above 200 Deg F)
Figure 2.3 - Engine Coolant Temperature (230 Deg F)
→Engine Speed = 699 rpm
→Cooling Fan = Fan On → Engaged
→On/Off Fan Output - J1/P1:11 = Off
→Engine Coolant Temperature = 187-230 Deg F
→Fan Override Switch - J1/P1:7 = Off
