FI SYSTEM DIAGNOSIS 4-47
“C44” HO2 SENSOR (HO2S) CIRCUIT MALFUNCTION (E-02, 19)
INSPECTION
Step 1
1) Lift and support the fuel tank. ("5-7)
2) Turn the ignition switch OFF.
3) Check the HO2 sensor coupler for loose or poor contacts.
4) Insert the needle pointed probes to the HO2 sensor coupler.
5) Turn the ignition switch ON and measure the heater voltage
between O/W wire (ECM side) and ground.
6) If the tester voltage indicates the battery voltage for few sec-
onds, it is good condition.
% Heater voltage: Battery voltage (O/W – Ground)
NOTE:
Battery voltage can be detected only during few seconds after
ignition switch is turned ON.
! 09900-25008: Multi circuit tester set
09900-25009: Needle pointed probe set
' Tester knob indication: Voltage (()
Is the voltage OK?
DETECTED CONDITION POSSIBLE CAUSE
The sensor voltage should be the following and less
after warming up condition.
(Sensor Voltage 0.4 V)
• HO2 sensor or its circuit open or short.
• Fuel system malfunction.
• ECM malfunction.
1
YES Go to Step 2
NO Replace the HO2 sensor with a new one.
1
V
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