E N G L I S H
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2. On GM cars remove the distributor cap to access the
pickup and reluctor.
6. Hall- Effect Sensor (Voltage) Test
This test checks for switching action of the Hall-Effect
position sensor in many distributor type ignition
systems.
To measure voltage of the output pulses produced by
the Hall-Effect sensor:
- Check the reference voltage from battery at
connector first because Hall sensors require power.
- C 12V from battery to the power terminal of
the switching transistor.
- Set the rotary switch to voltage ( ).
Connect:
- Black test probe to Ground terminal
- Red test probe to the Output signal terminal.
Insert:
- Thin metal blade or steel feeler gauge between Hall
device and magnet while watching the bar graph
move and the display change.
The output signal should vary from 12V to 0V because
inserting the metal blade blocks the magnetic field
from getting to the Hall Sensor and removing the
metal blade allows the magnetic field to reach the
sensor.
6. BASIC AUTOMOTIVE COMPONENT
TESTING
Computer Controlled Systems
Most of cars being built today have several on-board
computers that control the engine, transmission,
brakes, suspension, climate control, entertainment
and many other systems. Computerized vehicle
control systems are made up of the following three
basic component groups:
Summary of Contents for UD88
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