Catalytic Converter Monitor

Catalytic converter monitor (P0420).

Test conditions and main points to note:

1. Conduct test drives in a manner that will ensure all the following conditions are met.
1. Outside air temperature: -10 °C (14 °F) or higher.
2. Selector lever position: D range.
3. A/C switch: OFF.
2. The following drive pattern (from start up to where the ignition is turned off) completes one trip monitor. Time required is approximately 20 minutes)
<>1: Start the engine and accelerate quickly until speed reaches 72 kph (45 mph) or more.
<>2: Monitoring preparatory period: Drive for 300 seconds or more while maintaining speed within 72 to 97 kph (45 - 60 mph). It is permissible to brake (for a few seconds) during this period.
<>3: Decelerate until speed falls to between 56 and 64 kph (35 - 40 mph).
*4: Monitoring period: keep throttle open at a uniform level (minimize throttle variation) and drive for 90 seconds or more at 56 to 64 kph (35 - 40 mph).
<>5: Fully close the throttle and decelerate (it is permissible to brake during this period). After maintaining deceleration for 10 seconds, accelerate quickly until speed reaches 56 to 4 kph (35 - 40 mph). Subsequently, repeat steps *4 and .5 six times. (Ensure that steps *4 and +s have been fully completed a total of six times.)
<>6: Decelerate and stop the vehicle. After stopping the vehicle, turn off the ignition.




Drive cycle pattern