Toyota Corolla Repair Manual: Catalyst monitor (o2s type)
- Preconditions
The monitor will not run unless:
- mil is off.
- Engine coolant temperature (ect) is 176°f (80 °C) or greater.
- Intake air temperature (iat) is 14°f (–10 °C) or greater.*
Notice
: * 2002 and later my vehicles: the readiness test can be completed in cold ambient conditions (less than 14°f / –10 °C), if the drive pattern is repeated a second time after cycling the ignition off.
- Drive pattern
- connect the obd ii scan tool to the dlc3 to check monitor status and preconditions.
- Drive the vehicle at 40 to 55 mph (64 to 88 km/h) for approximately 3 minutes.
Notice
: drive with smooth throttle operation and avoid sudden acceleration.
If iat is less than 50°f (10 °C) when starting engine, continue to drive vehicle at 40 to 55 mph (64 to 88km/h) for approximately 4 minutes.
- Drive the vehicle at 35 to 45 mph (56 to 72 km/h) for approximately 7 minutes.
Notice
: drive with smooth throttle operation and avoid sudden deceleration as much as possible with the throttle fully closed.
- If readiness status dose not switch to complete, make sure that the preconditions are met and the ignition switch is turned off and then repeat steps (2) and (3).
- Release pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
- Start the engine and immediately begin driving as directed.
Purpose of the readiness tests
The on–board diagnostic (obd ii) system is designed to monitor the
performance of emission–related
components and report any detected abnormalities in the form of diagnostic
trouble codes
...
Evap monitor (vacuum pressure monitor)
Notice:
a cold soak must be performed prior to conducting the drive pattern to complete
the internal pressure
readiness monitor.
Cold soak preconditions
The monitor will not run unless:
...
Other materials:
Key confinement prevention function does not work
properly (unlock warning switch circuit)
Circuit description
The unlock warning switch turns on when the key is inserted in the ignition
key cylinder and the door courtesy
switch turns on when the driver’s door is opened, and the integration relay
monitors both switches conditions.
According to these switches conditions, the integ ...
Inspection procedure
Hint:
troubleshoot each trouble symptom in accordance with the chart below.
1 Clear dtc
Connect the hand–held tester or the obd ii scan tool to the dlc 3.
turn the ignition switch on and push the hand–held tester or the
obd ii scan tool main switch on.
read the dtc .
& ...
Handling of hose clamps
Before removing the hose, check the depth of the inserting
portion and the clamp position in order to restore it
surely.
change a deformed or dented clamp for a new one.
in case of reusing the hose, install the clamp on the hose
where it has a clamp track.
for a ...