Three-Way Catalytic Converter (TWC) Inspection
WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
- Perform the following procedures if only DTC P0420 is detected.
NOTE:
- Make sure that no HO2S DTCs have been detected. If detected, this inspection is not applicable for TWC inspection.
- Connect the WDS or equivalent to the DLC-2.
- Verify that the HO2S DTCs are not detected using the WDS or equivalent.
- If an HO2S DTC is detected, perform the appropriate DTC inspection procedure. (See DTC TABLE .)
- Clear the DTC form the PCM memory using the WDS or equivalent.
- Start the engine and warm it up to normal operating temperature.
- Verify that the engine compression is within the specification. (See
COMPRESSION INSPECTION
.)
- If the compression pressure is not within the specification, repair or replace any malfunctioning part.
- Drive the vehicle at Drive Mode 3. (See OBD-II DRIVE MODE .)
- Access Test ID 10:21:80 using the "Diagnostic Monitoring Test Result" function.
- Verify that the test result is within the specification as indicated on the WDS or equivalent.
- If not as specified, replace the catalytic converter.