This Service Bulletin contains Oxygen Sensor (O2S) Monitor threshold values for all models from 1996 to 2003 and some 2004 models. Starting in 2004, the O2S Monitor threshold values can be found in the repair manual. These values are used when analyzing the O2S test results to determine the O2S condition.
Checking O2S Test Results
To view O2S test results, the O2S Monitor must be completed and the test results must be checked within the same key cycle. If the ignition key is cycled OFF, the O2S test results will be set to the minimum or maximum limits, and all test results will be erased. The O2S test results are stored in the ECU (SAE term: Powertrain Control Module/PCM) when the monitor is completed. The test results are static and will not change once the monitor is complete.
The process for checking O2S test results is described in the following three basic steps:
1. Completing the O2S Readiness Monitor (page 2).
2. Accessing O2S Test Results (page 3).
3. Comparing O2S Test Results to Failure Thresholds (page 4).
Completing O2S Readiness Monitor
1. Clear any stored Diagnostic Trouble Codes (DTCs) using the Toyota Diagnostic Tester.
2. Start the engine.
3. Perform the drive pattern below to run and complete the Oxygen Sensor (O2S) Monitor.

Source

Related Tags: corolla, ecu, failure, matrix, maximum limits, models, oxygen sensor, powertrain, powertrain control module, powertrain control module pcm, repair manual, test results, threshold values, Toyota, toyota corolla