Actron AutoAnalyzer CP7665 - Manual (Page 28)

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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 200
Ω
range.
• View reading on display.
• C o m p a r e r e a d i n g t o
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.
– 200K
Ω
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.