Actron CP7677 Provozní pokyny stáhnout pdf (Strana 28)

28

• Connect BLACK test lead to re-

maining heater pin.

• Turn multimeter rotary switch to

200Ω range.

• View reading on display.

• Compare reading to manufacturer's

specification in vehicle service

manual.

• Remove both test leads from sen-

sor.

6. Connect BLACK test lead to sen-

sor GROUND pin.

• If sensor is 1-wire or 3-wire, then

GROUND is sensor housing.

• If sensor is 2-wire or 4-wire, then

GROUND is in sensor wiring har-

ness.

• Refer to vehicle service manual for

Oxygen Sensor wiring diagram.

7. Connect RED test lead to sensor

SIGNAL pin.

8. Test Oxygen Sensor.

• Turn multimeter rotary switch to...

– 2V range for Zirconia Type Sen-

sors.

– 200KΩ range for Titania Type

Sensors.

• Light propane torch.

• Firmly grasp sensor with a pair of

locking pliers.

• Thoroughly heat sensor tip as hot

as possible, but not “glowing.” Sen-

sor tip must be at 660°F to operate.

• Completely surround sensor tip

with flame to deplete sensor of

oxygen (Rich Condition).

• Multimeter display should read...

– 0.6V or greater for Zirconia Type

Sensors.

– an Ohmic(Resistance) value for

Titania Type Sensors. Reading will

vary with flame temperature.

• While still applying heat to sensor,

move flame such that oxygen can

reach sensor tip (Lean Condition).

• Multimeter display should read...

– 0.4V or less for Zirconia Type

Sensors.

– an overrange condition for Tita-

nia Type Sensors. (See Setting the

Range on page 6.)

9. Repeat Step 8 a few times to verify

results.

10. Extinguish Flame, let sensor cool,

and remove test leads.

11.Test Results.

Good Sensor:

• Heater Circuit resistance is within

manufacturer's specification.

• Oxygen Sensor output signal

changed when exposed to a rich

and lean condition.

Bad Sensor:

• Heater Circuit resistance is not

within manufacturer's specification.

• Oxygen Sensor output signal did

not change when exposed to a rich

and lean condition.

• Oxygen sensor output voltage

takes longer than 3 seconds to

switch from a rich to a lean condi-

tion.

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