CAUTION:
Perform the following procedures, DTC P0421:00 is indicated only.
1. Connect the M-MDS to the DLC-2.
2. Start the engine and warm it up to normal operating temperature.
3. Turn off the engine.
4. Verify that the engine compression is within the specification. (See COMPRESSION INSPECTION [SKYACTIV-G 2.5].)
If the compression pressure is not within the specification, repair or replace the malfunctioning part.
5. Drive the vehicle for 10 min at 65—96 km/h {40—60 mph} to allow the WU-TWC to reach normal operating temperature.
6. Stop the vehicle and leave it in a safe space.
7. Access Test ID 10:21:80 on the “Diagnostic Monitoring Test Result” function.
8. Verify that the test result is within specification indicated on the M-MDS.
If it is not as specified, replace the exhaust manifold. (See EXHAUST SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)