Hall effect sensors/switches, Fig. 27 – Actron AutoTroubleShooter CP7677 User Manual

Page 22

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9V

Hall Effect sensors are used whenever
the vehicle computer needs to know
speed and position of a rotating object.
Hall Effect sensors are commonly used
in ignition systems to determine cam-
shaft and crankshaft position so the ve-
hicle computer knows the optimum time
to fire the ignition coil(s) and turn on the
fuel injectors. This test checks for proper
operation of the Hall Effect sensor /
switch.

Test Procedure (see Fig. 27):

1. Remove Hall Effect Sensor from

vehicle.

Refer to vehicle service manual for
procedure.

2. Connect 9V battery to sensor

POWER and GROUND pins.

• Connect positive(+) terminal of 9V

battery to sensor POWER pin.

• Connect negative(-) terminal of 9V

battery to sensor GROUND pin.

• Refer to illustrations for POWER

and GROUND pin locations.

• For sensors not illustrated refer to

vehicle service manual for pin lo-
cations.

3. Insert BLACK test lead into COM

test lead jack.

4. I n s e r t R E D t e s t l e a d i n t o

test lead jack.

5. Connect RED test lead to sensor

SIGNAL pin.

6. Connect BLACK test lead to 9V

battery negative(-) pin.

7. Turn multimeter rotary switch to

function.

Multimeter should sound a tone.

8. Slide a flat blade of iron or mag-

netic steel between sensor and
magnet.
(Use a scrap of sheet metal,
knife blade, steel ruler, etc.)

• Multimeter tone should stop and

display should overrange.

• Remove steel blade and multim-

eter should again sound a tone.

• It is O.K. if display changes errati-

cally after metal blade is removed.

• Repeat several times to verify re-

sults.

9. Test Results

Good Sensor: Multimeter toggles
from tone to overrange as steel blade
is inserted and removed.

Bad Sensor: No change in multim-
eter as steel blade is inserted and
removed.

Fig. 27

Red

POWER

SIGNAL

SIGNAL

POWER

GROUND

SIGNAL

Sensor

GROUND

Jumper

Wires

Black

POWER

Magnet

Iron or Steel

Blade

Chrysler Distributor

Hall Effect

Ford Distributor

Hall Effect

Typical Hall

Effect Sensor

GROUND

Hall Effect Sensors/Switches

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