Emissions - OBD II Readiness Monitor Drive Patterns: Overview
ENGINEEG008-02
REVISED
March 29, 2002
Title:
READINESS MONITOR DRIVE PATTERNS
Models:
All '96 - '02
TSB REVISION NOTICE:
The information updated in this TSB is shown by Asterisk and underlined.
Introduction
The On-Board Diagnostic (OBDII) 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 OBDII system is designed to run 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 Toyota Diagnostic Tester with version 9.0 software (or newer), or a generic OBDII Scantool.
To view the Readiness Monitor status using the Toyota Diagnostic Tester, select "Monitor Status" from the Enhanced OBDII 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:
^ ECU has lost power (battery or fuse).
^ DTCs have been cleared.
^ The conditions for running the Readness 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".
Refer to the Readiness Monitor Drive Pattern Application Table to determine which drive pattern should be followed.
Contents
Applicable Vehicles
^ All 1996 - 2002 model year Toyota vehicles.
Warranty Information
Terms & Definitions
Required Tools & Material
NOTE:
A generic OBDII Scantool can be used in place of the Toyota Diagnostic Tester.
CAUTION
Strict observance of posted speed limits, traffic laws and road conditions are required when performing these drive patterns.
NOTE
^ 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).
Underhood Emission Control Information Label