9-134
P0133
EAS20767
P0133
•O
2
sensor: deterioration detected
EAS33291
OUTLINE
Explanation of detection method
The O
2
sensor detects the oxygen concentration in the exhaust gas, converts it into an electrical signal,
and sends it to the ECU. The ECU determines whether there is any deterioration by comparing the out-
put value from the O
2
sensor with a predetermined threshold value such as response time. When the
ECU determines that there is an O
2
sensor deterioration, the DTC is stored in ECU and MIL comes on.
Requirement for detection
Related sensor for detection
O
2
sensor, intake air pressure sensor, coolant temperature sensor (or engine temperature sensor),
front wheel sensor, rear wheel sensor, crankshaft position sensor, and throttle position sensor
Storing DTC
Once an abnormality has been detected, a pending DTC is stored in the memory of the ECU. Then, if
the abnormality is detected in the next two driving cycles, the MIL comes on and the DTC and FFD are
stored. If the vehicle is judged to be operating normally for three consecutive driving cycles, the MIL
goes off. However, the DTC, pending DTC, and FFD will not be deleted even if a battery terminal is dis-
connected.
Reproduction test
Perform the test using the driving pattern according to the detection method.
EWA20860
When test riding the vehicle, always comply with local traffic regulations.
EAS33153
FAIL-SAFE SYSTEM
• Able to start engine
• Able to drive vehicle
Frequency of detection Once per driving cycle
Malfunction determination
method
If an abnormality is detected in three consecutive driving cycles, the
malfunction is confirmed and the MIL comes on.
Driving condition Flat road, no overloading, and no acceleration or deceleration
Type of detection result Complete, Incomplete
Duration 400 seconds or more
O
2
feedback Carried out
Vehicle speed 40–60 km/h (25–37 mph)
Gear position No condition specified
Engine speed No condition specified
Fuel correction value The O
2
feedback correction amount is within a certain range.
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