Catalytic Converter Monitor and Readiness Code

NOTE: 

• During the procedure, do not turn the vehicle to the ACCESSORY mode or the OFF (LOCK) mode.
• All readiness codes are cleared when the 12 volt battery is disconnected, if DTCs have been cleared, or if the PCM is reset with the HDS.
• Low ambient temperatures or excessive stop-and-go traffic may increase the drive time needed to switch the readiness code from incomplete to complete.
• The readiness code will not switch to complete until all the enable criteria are met.
• If a fault in the secondary HO2S system caused the MIL to come on, the readiness code cannot be set to complete until you correct the fault.

Enable Criteria 

• ECT SENSOR 1 at 158°F (70°C) or more.
• IAT SENSOR at 20°F (-7°C) or more.
• Vehicle speed above 25 mph (40 km/h).

Procedure 

1. Connect the HDS to the vehicle's data link connector (DLC) 

, and bring up the READINESS CODEs screen for Catalyst in the DTCs MENU.

2. Enter the maintenance mode, then start the engine 

3. Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. After about 5 miles (8 km), the readiness code should switch to complete.

4. If the readiness code is still not set to complete, check for a Pending DTC with the HDS. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.