Toyota Corolla Repair Manual: Circuit description
Refer to dtc p0130
|
Dtc no. |
Dtc detection condition |
Trouble area |
| P0133 | After engine has been warmed up, if response time that heated
oxygen sensor’s output voltage reaches from rich to lean. Or from lean to rich, is 0.6 Second or more during idling. (2 Trip detection logic) |
|
| If response time of heated oxygen sensor’s output voltage in one rich–lean cycle is 6 seconds or more during idling. (2 Trip detection logic) |
Hint
: sensor 1 refers to the sensor closest to the engine assembly.
Monitor description
The engine control module (ecm) uses the heated oxygen sensor information to regulate the air–fuel ratio close to a stoichiometric ratio. This maximizes the catalytic converter’s ability to purify the exhaust gases.
The sensor detects oxygen levels in the exhaust gas and sends this signal to the ecm.
The inner surface of the sensor element is exposed to the outside air. The outer surface of the sensor element is exposed to the exhaust gas. The sensor element is made of the platinum coated zirconia and includes an integrated heating element. The heated oxygen sensor has the characteristic whereby its output voltage change suddenly in the vicinity of the stoichiometric air–fuel ratio. The heated oxygen sensor generates waveform of a voltage between 0 v and 1 v in response to the oxygen concentration in exhaust gas.
When the output voltage of the heated oxygen sensor is 0.55 V or more, the ecm judges that the air–fuel ratio is rich. When it is 0.40 V or less, the ecm judges that the air–fuel ratio is lean.
The ecm monitors the response feature of the heated oxygen sensor. If the response time of the sensor output status change from rich to lean or vice versa becomes longer, the ecm interprets this as a malfunction in the heated oxygen sensor and sets a dtc.
Monitor strategy
Typical enabling condition
Typical malfunction thresholds
Component operating range
Wiring diagram
Refer to dtc p0130
Oxygen sensor circuit slow
response
Dtc p0133 oxygen sensor circuit slow
response (bank 1 sensor 1) ...
Inspection procedure
Hint:
hand–held tester only:
narrowing down the trouble area is possible by performing ”a/f control” active
test (heated oxygen
sensor or other trouble areas can be distinguished). Perform active ...
Other materials:
Listing the registered cellular phones
Select “List Phone” using .
The list of registered cellular phones will be displayed.
● Connecting the registered cellular phone to the audio system
1 Select the name of the cellular phone to be connected using
.
2 Select “Select” using .
● Deleting a registered cellular pho ...
Inspection procedure
1 Input signal check
See input signal check on page 05–745.
check the indicator light operation when each of the set/
coast, resume/accel and cancel is turned on.
Ok:
set/coast, resume/accel switch:
the signals shown in the table on the left should be
output when each switch is o ...
Cooling
Preparation
Recomended tools
Equipment
Coolant
...