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Q:Are there any abnormalities? YES: Repair it. Then go to Step 4. NO: Go to Step 3. STEP 3. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to (2) Check the diagnostic trouble code (DTC). Q:Is DTC P0401 set? YES: Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code Registration NO: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use STEP 4. Test the OBD-II drive cycle. (1) Carry out a test drive with the drive cycle pattern. Refer to (2) Check the diagnostic trouble code (DTC). Q:Is DTC P0401 set? YES: Retry the troubleshooting. NO: The inspection is complete. DTC P0421: Warm Up Catalyst Efficiency Below Threshold (bank 1) M11310100229USA0000010000 TECHNICAL DESCRIPTION ⦆ The signal from the rear heated oxygen sensor ⦆ The ECM compares the output of the front and rear DESCRIPTIONS OF MONITOR METHODS Front and rear heated oxygen sensor rich/lean MONITOR EXECUTION Continuous MONITOR EXECUTION CONDITIONS (Other Other Monitor (There is no temporary DTC stored in ⦆ Heated oxygen sensor (front) monitor ⦆ Heated oxygen sensor (rear) monitor ⦆ Heated oxygen sensor heater (front) monitor ⦆ Heated oxygen sensor heater (rear) monitor ⦆ Misfire monitor ⦆ Fuel system monitor ⦆ Air/fuel ratio feedback monitor Sensor (The sensor below is determined to be ⦆ Mass airflow sensor ⦆ Engine coolant temperature sensor ⦆ Intake air temperature sensor ⦆ Barometric pressure sensor MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS> 13Ab-451 DIAGNOSTIC TROUBLE CODE PROCEDURES |