Toyota Corolla Repair Manual: 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 (dtcs). Since the various components need to be monitored during different driving conditions, the obd ii system is designed to ran separate monitoring programs called readiness monitors. Many state inspection and maintenance (i/m) programs require that vehicles complete their readiness monitors prior to beginning an emissions test.
- The current status of the readiness monitors can be seen by using the hand–held tester with version 9.0 Software (or newer), or a generic obd ii scan tool.
- To view the readiness monitor status using the hand–held tester, select ”monitor status” from the enhanced obd ii menu.
- A status of ”complete” indicates that the necessary conditions have been met to run the performance tests for the related readiness monitor.
- The readiness monitor will be reset to ”incomplete” if:
- ecm has lost power (battery or fuse).
- Dtcs have been cleared.
- The conditions for running the readiness monitor have not been met.
- In the event that any readiness monitor shows ”incomplete,” follow the appropriate readiness monitor drive pattern to change the readiness status to ”complete.”
Caution
: strict observance of posted speed limits, traffic laws, and road conditions are required when performing these drive patterns.
Notice
: these drive patterns represent the fastest method to satisfy all necessary conditions which allow the specific readiness monitor to complete.
In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other factors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to complete.
To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).
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.*
...
Other materials:
Indicator/warning lights
Concept
Indicator/warning lights in the instrument cluster
display the status of some functions in the vehicle
and indicate when a malfunction is present in
the monitored systems.
General information
The indicator/warning lights can light up in a variety
of combinations and colors.
Several of the l ...
On–vehicle inspection
1. Horn button assy (vehicles not involved in
collision)
Check the diagnostic system .
visually check the following item with the horn button assy
(with airbag) installed in the vehicle.
Check cuts, minute cracks or marked discoloration on the
horn button assy top surface and in the ...
Adjusting the distance
Safety information
Warning
The system cannot serve as a substitute for the
driver's personal judgment. Due to the system
limits, braking can be late. There may be a risk
of accident or risk of damage to property. Be
aware to the traffic situation at all times. Adjust
the distance to the traffic and ...
