ASE A6 Electrical Electronics Practice Test
7. The engine's electric radiator cooling fan motor illustrated above does not operate unless commanded ON with a bidirectional scan tool. Technician A says the vehicle most likely has a faulty fan relay. Technician B says a faulty engine coolant temperature sensor or circuit would result in this condition. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. The relay and the circuit work when commanded ON by the scan tool.
Answer B is correct. Use the scan tool's bi-directional control to eliminate the controller's output, the fan motor, and the circuit as the cause. A problem with the engine coolant temperature circuit would result in this condition.
Answer C is wrong. Technician B is correct.
Answer D is wrong. Technician B is correct.