Actron AutoTroubleShooter CP7677 User Manual download pdf (Page 14)

14

• If you hear tone - The switch is

closed.

• If you don’t hear tone - The switch

is open.

8. Repeat Step 7 to verify switch op-

eration.

Good Switch:

Tone turns ON and

OFF as you operate switch.

Bad Switch:

Tone always ON or tone

always OFF as you operate switch.

4. Connect BLACK test lead to one

side of coil.

5. Connect RED test lead to other

side of coil.

6. View reading on display.

• Typical solenoid / relay coil resis-

tances are 200Ω or less.

• Refer to vehicle service manual for

your vehicles resistance range.

7. Test Results

Good Solenoid / Relay Coil:

Display

in Step 6 is within manufacturers

specification.

Bad Solenoid / Relay Coil:

• Display in Step 6 is not within manu-

facturers specifications.

• Display reads overrange on every

ohms range indicating an open cir-

cuit.

NOTE: Some relays and solenoids

have a diode placed across the coil.

To test this diode see Testing Di-

odes on page 11.

1. Insert BLACK test lead into COM

test lead jack.

2. Insert RED test lead into

test lead jack.

3. Turn multimeter rotary switch to

200

Ω function.

Most solenoids and relay coil resis-

tances are less than 200Ω. If meter

overranges, turn multimeter rotary

switch to next higher range. (see

Setting the Range on page 6)

This test checks to see if a solenoid or

relay have a broken coil. If the coil tests

good, it is still possible that the relay or

solenoid are defective. The relay can

have contacts that are welded or worn

down, and the solenoid may stick when

the coil is energized. This test does not

check for those potential problems.

To test Solenoids and Relays (see Fig.

18):

Relay or

Solenoid

Red

Black

Fig. 18

Testing Solenoids and Relays

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 33 34

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