Engine General Information and Diagnosis: 1A-66
2 1) Turn the ignition switch OFF.
2) Insert the needle pointed to the HO2 sensor coupler.
3) Turn the ignition switch ON and measure the heater
voltage between O/W wire (ECM side) and ground.
If the tester voltage indicates the battery voltage for few
seconds, it is good condition.
Heater voltage
Battery voltage (Positive terminal: O/W – Negative
terminal: Ground)
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
Is the voltage OK?
Go to step 3. Replace the HO2
sensor with a new one.
3 1) Turn the ignition switch OFF.
2) Disconnect the HO2 sensor coupler.
3) Measure the resistance between the terminals (W – W)
of the HO2 sensor.
HO2 sensor resistance
11.5 – 14.5 Ω at 23 °C (73 °F) (W – W)
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Resistance (Ω)
Is the voltage OK?
• Gr or W wire open or
shorted to ground, or
poor (7), (4), (21) or
(1).
• If wire and
connection terminal
and wire harness for
open circuit and poor
connection.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• If the wires are OK,
replace the ECM with
a new one, and
inspect again
Replace the HO2
sensor with a new one.
Step Action Yes No
O/W
V
(A)
(B)
I705H1110109-03
(A)
I705H1110125-03
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