Actron CP7665 Operations Instructions download pdf (Page 24)

24

Reluctance sensors are used when-

ever the vehicle computer needs to

know speed and position of a rotat-

ing object. Reluctance sensors are

commonly used in ignition systems

to determine camshaft and crank-

shaft position so the vehicle com-

puter knows the optimum time to fire

the ignition coil(s) and turn on the

fuel injectors. This test checks the

reluctance sensor for an open or

shorted coil. This test does not check

the air gap or voltage output of the

sensor.

Test Procedure (see Fig. 25):

Reluctance

Sensor

Red

Black

1. Insert BLACK test lead into

COM test lead jack.

2. Insert RED test lead into

test lead jack.

3. Connect RED test lead to ei-

ther sensor pin.

4. Connect BLACK test lead to

remaining sensor pin.

Reluctor

Ring

Magnet

5. Turn multimeter rotary switch

to 2000Ω range.

6. View reading on display while

flexing sensor wires in sev-

eral places.

• Typical resistance range is 150

- 1000Ω.

• Refer to vehicle service manual

for your vehicles resistance

range.

• As you flex sensor wires, the

display should remain steady.

7. Test Results

Good Sensor:

Dis-

play reading is within

manufacturers speci-

fication and remains

steady while sensor

wires are flexed.

Bad Sensor:

Display

reading erratically

changes as sensor

wires are flexed or

display reading is not

within manufacturers

specification.

Fig. 25

Magnetic Pick-Up Coils – Reluctance Sensors

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