![]() Toyota: The oxygen sensor monitor should run after idling the engine for nine minutes, then driving at a steady 25 mph for two minutes. Then smoothly accelerate to 30 to 40 mph. These tools also are available at no charge via the “Wells Tech” link at . Then drive at a steady vehicle speed above 25 mph for two minutes. The Technical Services team also offers vehicle systems training videos for automotive parts professionals, service writers and technicians, as well as a free quarterly diagnostic newsletter, CounterPoint. These videos cover a broad range of automotive driveability issues commonly encountered on today’s domestic and foreign nameplate applications. in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its. This video is one of nearly two dozen comprehensive free on-car diagnostic programs available through the website and YouTube. Toyota Camry P0440: Evaporative Emission Control System >Toyota Camry. To avoid this expensive purchase when possible, the Wells team demonstrates how to remove and bench test the canister and VSV. ECT (Coolant Temp) is 176F (80C) or greater. The monitor will not run unless: MIL is OFF. If the tank depressurizes during the EVAP test, a trouble code(s) is set indicating a vapor leak and/or a defective EVAP system component(s). 4: Catalyst Monitor (AF Sensor Type) Preconditions. Your Toyota Camry EVAP system has a pressure sensor to detect if the tank remains pressurized while the EVAP monitor is running, basically ensuring it is not leaking. ![]() In many cases, industry repair resources recommend automatic replacement of the EVAP canister when a PO441 or PO446 code is encountered. I found Toyota TSB on Readiness Monitor Drive Patterns and have been following it exactly several times already. The company’s Technical Services team produced the video using a Camry LE model that had failed an emissions test as a result of a PO446 code, which indicates that a leak was detected while activating the vacuum switch valve (VSV) during an EVAP monitor test. The new video can be accessed via the “Wells Tech” link at as well as through. The step-by-step diagnosis and repair of EVAP system issues on a 1999 Toyota Camry LE model is now covered in a free troubleshooting video available from Wells Vehicle Electronics. ![]()
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