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4-1-29 FI SYSTEM DIAGNOSIS<br />
“C22” OXYGEN SENSOR CIRCUIT MALFUNCTION<br />
DETECTED CONDITION<br />
Oxygen sensor signal is not input in ECU since then<br />
more than 180 sec. after the engine run.<br />
▣ INSPECTION<br />
1) Remove the seat.<br />
2) Turn the ignition switch “OFF” position.<br />
3) Check the Oxygen sensor coupler for loose or<br />
poor contacts.<br />
Is OK?<br />
YES<br />
NO<br />
● B or GR wire open or shorted to<br />
ground, or poor ⑨ or 59 connection.<br />
(Sensor)<br />
● OB or B wire open or shorted to<br />
ground, or poor � or 44 connention.<br />
(Heater)<br />
● If wire and connection are OK,<br />
intermittent trouble or faulty ECU.<br />
● Recheck each terminal and wire<br />
harness for open circuit and poor<br />
connection.<br />
Replace the Oxygen sensor.<br />
40<br />
POSSIBLE CAUSE<br />
● Oxygen sensor, Oxygen sensor heater circuit open<br />
or short.<br />
● Oxygen sensor, Oxygen sensor heater malfunction.<br />
● ECU malfunction.<br />
59<br />
44<br />
ECU Coupler<br />
�<br />
⑨
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