DriveMaster® - Lesson 1: Fan Drive System, © 2001 Horton, Inc.

REVIEW - FAN DRIVE CONTROL SYSTEM

REVIEW - QUESTIONS and ANSWERS

INDEX

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1. Advantages of using a Horton fan drive include increased horsepower, consistent coolant temperature, and increased fuel economy.
True False
2. In the operation of most ECM-controlled fan drive systems without a relay, the ECM sends a direct signal to the solenoid valve to engage or disengage the friction disc. True False
3. Select the correct name for this component.
      Solenoid Valve
      Engine Coolant Thermal Switch
      Refrigerant Pressure Switch
4. Select the correct name for this component.
      Solenoid Valve
      Engine Coolant Thermal Switch
      Refrigerant Pressure Switch
5. Select the correct name for this component.
      Solenoid Valve
      Engine Coolant Thermal Switch
      Refrigerant Pressure Switch
6. The fan drive is engaged when air pressure is applied through the solenoid valve.
True False
7. The engine coolant thermal switch sends a signal to engage the Fan Drive when the engine coolant reaches the switch's high set point.
True False
8. In a normally-closed electrical control system, electrical contacts are closed when engine temperature and air conditioning pressure are below high set points.
True False
9. When air conditioning pressure reaches the low set point, a signal is sent to the solenoid valve or ECM by the
      Thermal Switch
      Solenoid Switch
      Refrigerant Pressure Switch.
10. The solenoid valve functions to regulate air to each of the electrical control components.
True False
11. It is best to locate the solenoid valve close to the fan drive, and on the engine block if possible.
True False
12. An electronic control module is:
a computer a sensor a sending unit
13. ECM control systems improve engine performance, reliability and fuel efficiency more than non-ECM control systems.
True False
14. ECMs monitor data from sensors and send the appropriate signals to controls and actuators based on:
      operator options
      programming logic
      vehicle service periods
15. In most ECM-controlled systems, sensors and actuators are wired directly to the ECM, not the solenoid valve.
True False
16. Select the correct path of a sensor signal to fan drive operation in an ECM-controlled system.

   A
   B
   C
17. To find fault code explanations when troubleshooting ECM-controlled systems, look:
      under the hood
      inside the door panel
      in the service manual
18. The three types of fan drive control systems are ECM-controlled, normally-open and normally-closed.
True False
19. If a vehicle has a normally-open control system, the air supply for the Drive Master should be connected to which port of the 3-way solenoid valve:
normally-open normally-closed
20. In a normally-open control system, switches are wired in:
series parallel
21. On the diagram, connect the electrical components for a normally-open control system and indicate if the air supply is connected to the solenoid valve's normally-open or normally-closed inlet port. A B
22. When all switches are open in a normally-open control system, the solenoid is:
energized de-energized
and the fan drive is:
engaged disengaged.
23. If a switch closes in a normally-open control system, the solenoid is:
energized de-energized
and the fan drive is:
engaged disengaged.
24. In a normally-closed control system, switches are wired in parallel.
True False
25. On the diagram, connect the electrical components for a normally-closed control system and indicate if the air supply is connected to the solenoid valve's normally-open or normally-closed inlet port. A B C D
26. Air will escape through the outlet port going to the fan drive of a normally-open solenoid valve when air is applied to the top.
True False
27. If a switch opens in a normally-closed control system, the solenoid is:
energized de-energized
and the fan drive is:
engaged disengaged.
28. The fan drive can be tested in a normally-open control system by disconnecting a wire from a sensor.
True False

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