Question 6
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(a) State two causes of each of the following in a motor vehicle:
(i) horn not honking;
(ii) poor operation of wiper;
(iii) malfunctioning washer.
(b) State:
(i) two types of fuel gauge;
(ii) the function of a fuel guage;
(iii) one symptom of a faulty fuel gauge.
(c) List three stages of a fault finding in an auxiliary system of a motor vehicle.
Observation
The candidates were expected to copy and complete the table.
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(a)(i) Causes of motor vehicle horn not honking
- Relay not working
- High resistance contact/switch
- Loose/broken wiring
- Partial/loose switch contact
- Torn/broken diaphragm
- Blown fuse
(ii) Causes of poor operation of wiper- Loose/broken wiring.
- Switch not making contact.
- Worn motor brushes/slip rings connection.
- Relay timer not working.
- Blown fuse
(iii) Causes of malfunctioning washer
- Corrosion in washer motor connection.
- Loose or broken wiring/fuse.
- Switch not making contact.
- Blocked pipes/jets/hose.
(b)(i) Types of fuel gauge- Magnetic fuel gauge
- Bimetallic fuel gauge.
(ii) Fuel gauge indicates the level of fuel contained in a tank.
(iii) Symptoms of a faulty fuel gauge- Fluctuating indicator pointer
- Pointer failure
- Hanging indicator pointer
(c) Stages of fault finding in an auxiliary system of a motor vehicle
- Observe and verify the fault/troubleshooting/diagnosing.
- Collect further information.
- Evaluate the evidence.
- Carry out further tests in a logical sequence.
- Rectify the fault/finding possible solution.
- Check the system and all other systems.
Many candidates did not show familiarity to this question. However, responses to question can be rated average.