Monitors, Trips, Drive Cycles and Readiness Codes

The PCM monitors the following main diagnosis items and records whether the evaluation complete or incomplete in the past.

These records can be read with a scan tool. (When using MUT-II, "Complete" will appear to indicate that the evaluation has been completed.)

These records will all be reset if the battery terminal is disconnected or the DTC are erased, etc.

To complete the readiness test status which has been reset, the "OBD-II Drive Cycle" related to an on-board diagnostic item should be carried out.

NOTE: If the vehicle is normal, the readiness test status will be complete by carrying out the "OBD-II Drive Cycle" once. If the PCM detects a malfunction of the vehicle, the readiness test status will be complete by carrying out the "OBD-II Drive Cycle" twice. In addition, after all readiness test status are complete, a DTC should be interrogated. If a DTC is stored, perform repair by referring to the relevant DTC procedures. Then complete the readiness test status by repeating the "OBD-II Drive Cycle." If a DTC is not stored, no further action will be needed.


- Catalyst: P0420
- Evaporative system: P0442, P0455
- Heated oxygen sensor: P0130, P0136
- Heated oxygen sensor heater: P0135, P0141
- EGR system: P0400


- Catalyst: P0421, P0431
- Evaporative system: P0442, P0455
- Heated oxygen sensor: P0130, P0136, P0150, P0156
- Heated oxygen sensor heater: P0135, P0141, P0155, P0161
- EGR system: P0400