Actron CP7677 Instruções de Operação descarregar pdf (Página 23)

23

Magnetic Pick-Up Coils – Reluctance Sensors

Reluctance sensors are used whenever

the vehicle computer needs to know

speed and position of a rotating object.

Reluctance 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 the reluc-

tance 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. 28):

Reluctance

Sensor

Red

Black

1. Insert BLACK test lead into COM

test lead jack.

2. Insert RED test lead into

test lead jack.

Reluctor

Ring

Magnet

3. Connect RED test lead to either

sensor pin.

4. Connect BLACK test lead to re-

maining sensor pin.

5. Turn multimeter rotary switch to

2K

Ω range.

6. View reading on display while flex-

ing sensor wires in several 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:

Display

reading is within manu-

facturers specification

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 specifi-

cation.

Fig. 28

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 33 34

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