Actron AutoAnalyzer CP7665 User Manual download pdf (Page 28)

28

5. Test heater circuit.

• If sensor contains 3 or more

wires, then your vehicle uses a

heated O

2

sensor.

• Refer to vehicle service manual

for location of heater pins.

• Connect RED test lead to ei-

ther heater pin.

• Connect BLACK test lead to

remaining 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

sensor.

6. Connect BLACK test lead to

sensor 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 wir-

ing harness.

• Refer to vehicle service manual

for Oxygen Sensor wiring dia-

gram.

7. Connect RED test lead to sen-

sor SIGNAL pin.

8. Test Oxygen Sensor.

• Turn multimeter rotary switch

to...

– 2000mV range for Zirconia

Type Sensors.

– 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 “glow-

ing.” Sensor 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...

– 600mV or greater for Zirco-

nia Type Sensors.

– an Ohmic(Resistance) value

for Titania Type Sensors.

Reading will vary with flame

temperature.

• While still applying heat to sen-

sor, move flame such that oxy-

gen can reach sensor tip (Lean

Condition).

• Multimeter display should

read...

– 400mV or less for Zirconia

Type Sensors.

– an overrange condition for

Titania 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 specifi-

cation.

• Oxygen Sensor output signal

changed when exposed to a

rich and lean condition.

Bad Sensor:

• Heater Circuit resistance is not

within manufacturer's specifi-

cation.

1 2 ... 23 24 25 26 27 28 29 30 31 32

Comments to this Manuals

No comments