L3 - 7270/7290 - 457 Diagnose - Rectify Veh Aux Elec Faults

Which component converts AC to DC in an alternator?

• A relay.

• A rectifier.

• A coil pack.

• A voltage regulator.

Which of the following DIN numbers would indicate an ignition live on a wiring diagram?

• 10

• 15

• 30

• 31

What should a Technician check when diagnosing a faulty alternator?

• The battery reserve capacity.

• The charge rate at the battery.

• The starter motor current draw.

• The alternator internal resistance.

When looking at a waveform on an oscilloscope, what does the vertical line represent?

• Volts.

• Amps.

• Time.

• Ohms.

What is the system called that emits a warning when the vehicle crosses the white line on the road without using indicators?

• Blind spot alert.

• Lane departure.

• Lane change assist.

• Collision avoidance.

Why must a hybrid vehicle incorporate a DC-to-DC convertor?

• To maintain a constant voltage.

• To enable regeneration to take place.

• To reduce high voltage to low voltage.

• To allow the alternator to charge the high voltage battery.

What does a GPS rely on for accuracy?

• An accurate atomic clock.

• Sensors in the road surface.

• ECU updates from a satellite.

• Satellite navigational programme.

What would be the simplest way to diagnose a faulty horn switch?

• Check the operation with an oscilloscope.

• Remove the dashboard and trace the wiring.

• Carry out an actuator test with a code reader.

• Run a wire from another car and press the horn on that car.

When diagnosing a fault with an inductive type ABS sensor, the Technician should first disconnect the sensor and then test it with

• a test light.

• an ammeter.

• an ohmmeter.

• a fused jumper wire.

What test equipment can be used to check the correct operation of the CAN bus system on a modern vehicle?

• Ammeter.

• Oscilloscope.

• Digital voltmeter.

• An analogue voltmeter.