ELECTRICAL / ELECTRONIC APPLICATION & INSTALLATION MANUAL
Conditions to turn Fan OFF for C-15 and C-16
Conditions to turn Fan OFF for C-10 and C-12
Coolant Sensor Temperature < 208°F (98°C)
Coolant Sensor Temperature < 198°F (92°C)
The fan has been ON for at least 30 seconds
The fan has been ON for at least 30 seconds
Intake Manifold Air Temperature < 151°F (66°C)
Intake Manifold Air Temperature < 151°F (66°C)
Engine Retarder ON Strategy is not Active
Engine Retarder ON Strategy is not Active
A/C High Pressure Switch not Active
A/C High Pressure Switch not Active
PTO On/Off Switch in OFF position
PTO On/Off Switch in OFF position
Manual Fan Override Switch in OFF position
Manual Fan Override Switch in OFF position
Key Switch turned OFF with Engine Speed Present
Key Switch turned OFF with Engine Speed Present
NOTE: The ECM will turn the cooling fan OFF for 10 seconds during an engine shutdown. 17.2 Cooling Fan Output Operation with Fan Control Type Programmed to Three Speed Fan The Three Speed Fan operates in three modes: brake, slip and direct (full speed). Two solenoids are required for three speed fan control. Refer to “Wiring Diagram 35 - Three Speed Cooling Fan Circuit” on page 78.The fan comes ON in direct mode in the event of an output circuit failure such as an open circuit. This requires relays with normally open contacts (if powering the coil side of a relay), or solenoid valves that deactivate the fan when it receives the disable (high) signal. Additional switching devices in the circuit should cause an open circuit to turn the fan ON. This circuit is designed to withstand a short circuit to “+Battery” voltage and will not be adversely affected if other devices are connected to this line when directly driving a solenoid. When driving relays, connection of other devices to the Cooling Fan Outputs should not be necessary. When the fan is in Brake Mode both output drivers are ON (Fan OFF). In Slip Mode Output #4 driver is OFF and Output #5 driver is ON. During Direct Mode both output drivers are OFF (Fan ON full speed). OEM provided and installed components required: 1) Two solenoids or two relays and two solenoids.
Customer Parameter programming required: 1) Cooling Fan Type programmed to Three Speed Fan.
NOTICE Caterpillar requires the OEM to install a warning sticker near the fan indicating the fan is automatically controlled and may come ON at any time.
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C-10, C-12, C-15 & C-16 Truck Engines
