![]() ![]() ![]() The vehicle must then be driven in stop-and-go traffic conditions at five different cruise speeds ranging from 25 to 45 mph over a period of 10 minutes. The following are some sample drive cycles for the catalyst monitor to run.įord: The catalytic converter monitor will not run until the oxygen sensor monitor has run and completed successfully with no faults found. In some cases, it may even be necessary to complete the prescribed drive cycle several times before the catalyst monitor will run. Some vehicles have very specific drive cycles that must be followed before the catalyst monitor will run. Depending on the vehicle application, this usually includes completing the oxygen sensor monitors first, followed by driving at highway speeds (60 to 65 mph) for at least 10 to 15 minutes under light load, no conflicts with other monitors that have not yet run (such as EVAP or EGR monitors which may have to complete before the catalyst monitor will run), and no fault codes that could affect the accuracy of the test. The catalytic converter monitor may require specific driving conditions before it will run. 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. Then drive at a steady vehicle speed above 25 mph for two minutes. This will complete the second half of the monitor that checks the responsiveness of the O2 sensors.Ĭhrysler: Idle for five minutes (to reach closed loop operation). After this, turn the A/C and defroster off, then accelerate at half throttle to 55 mph and hold at a steady 55 mph for three minutes. ![]() The first part of the monitor runs after idling the engine for two and a half minutes with the A/C and rear defroster on. GM: GM uses a two-part oxygen sensor monitor. The following are some sample drive cycle requirements for the oxygen sensor monitor to run:įord: The monitor should run when the engine has reached normal operating temperature, the inlet air temperature is between 40 and 100 degrees F, and the vehicle is cruising at a steady 40 mph for four minutes.
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