Catalytic Converter Monitor

Catalytic converter monitor (P0420, P0421)

Test requirements/procedure

1. All of the following requirements should be met when carrying out a drive test.
(1) Atmospheric temperature: 10°C (14°F) or more
(2) Condition of A/T:
- Selector lever position: D range
(3) A/C switch: OFF
2. One trip monitor will be completed by driving according to the steps below (from start to switch off). It will take 20 minutes.
*1: Start the engine and accelerate gradually to 72 km/h (45 mph) or more.
*2: Preparation period; continue driving between 72 and 97 km/h (45 and 60 mph) for 300 seconds. Brake may be applied for this period if it continues for only a few seconds.
*3: Decelerate to 56 - 64 km/h (35 - 40 mph).
<>4: Drive between 56 and 64 km/h (35 and 40 mph) at a constant throttle angle (by not moving the throttle pedal as much as possible) for 90 seconds or more during monitor.
*5: Decelerate with the throttle valve fully closed (Brake may be applied for this period). After the vehicle is being decelerated for ten seconds, accelerate gradually to 56 - 64 km/h (35 - 40 mph).
*6: Decelerate and stop the vehicle. Then turn off the ignition switch.




Drive cycle pattern