Catalytic Converter Monitor
This monitor applies to DTCs P0421 and P0431. Following conditions must be met during the test:
- Atmospheric Temperature Is 14°F (-10°C) Or More
- A/C Switch Is In OFF Position
- Selector Lever Is In "D" Range
NOTE:
Remove all test equipment from vehicle and install all components and connectors that were removed or disconnected during testing.
Monitor takes about 20 minutes to complete. To run monitor, use illustration. See Fig 1 . This monitor must be performed twice. Perform steps as follows:
- Start the engine.
- Accelerate vehicle to 45 MPH.
- Travel 300 seconds or more while keeping speed at 45-60 MPH (5th gear on M/T).
- Decelerate to 35-40 MPH.
- While keeping accelerator pedal opening degree constant, keep vehicle speed at 35-40 MPH for 90 seconds or more (this is when monitor runs).
- Fully close throttle and decelerate for 10 seconds. Then, quickly accelerate until speed is 35-40 MPH. Then repeat steps 5 and 6 five more times.
- Return vehicle to shop and turn ignition switch to LOCK position.
- Recheck for DTCs. If DTC P0421 or P0431 resets, return to appropriate diagnostic procedure under DIAGNOSTIC TESTS .