How to Set Readiness Codes

How to Set Readiness Codes

Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness Codes)

The vehicle has certain readiness codes that are part of the on-board diagnostics for the emissions systems. If the vehicle s 12 volt battery has been disconnected or gone dead, if DTCs have been cleared, or if the PCM has been reset, these readiness codes are reset to incomplete. In some states, part of the emissions testing is to make sure these codes are set to complete. If all of them are not set to complete, the vehicle may fail the emission test, or the test cannot be finished- To check if the readiness codes are set to complete, turn the vehicle to the ON mode, but do not start the engine. The MIL comes on for 15 20 seconds. If it then goes off, the readiness codes are set to complete. If it flashes five times, one or more readiness codes are not set to complete. To set readiness codes from incomplete to complete, do the procedure for the appropriate code- To check the status of a specific DTC system, check the OBD status in the DTC MENU with the HDS. This screen displays the DTC, the current data list of the enable criteria, and the status of the readiness testing- 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- 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- Evaporative Emission (EVAP) Control System Monitor and Readiness Code

NOTE: 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- Enable Criteria

Refer to the following DTC-

P0441

P0456

P145D

Procedure

Refer to the following DTC- NOTE: Do not Function Test with the HDS-

P0441

P0456

P145D

Air Fuel Ratio (A/F) Sensor 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- Enable Criteria

ECT Sensor 1 at 140 °F (60 °C) or more- Procedure

1- Start the engine- 2- Test-drive the vehicle under stop-and-go conditions with short periods of steady cruise. During the drive, decelerate (with the throttle fully closed) for 5 seconds. After about 3.5 miles (5.6 km), the readiness code should switch from incomplete to complete- 3- Check the readiness codes screen for the AIR FUEL RATIO (A/F) SENSOR in the DTCs MENU with the HDS-

If the HDS indicates complete, readiness is complete-

If the HDS indicates not complete, go to the next step- 4- Check for a Pending DTC. If there is no DTC, the enable criteria was probably not met. Select the DATA LIST Menu. Check ECT Sensor 1 in the ALL DATA LIST with the HDS. If ECT sensor 1 is less than 140 °F (60 °C), run the engine until it is more than 140 °F (60 °C), then repeat the procedure- Air Fuel Ratio (A/F) Sensor Heater Monitor Readiness Code

NOTE: 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- Procedure

1- Start the engine, and let it idle for 1 minute. The readiness code should switch from incomplete to complete- 2- If the readiness code is still not set to complete, check for a Pending DTC. If there is no DTC, repeat the procedure- Misfire Monitor and Readiness Code

This readiness code is always set to available because misfiring is continuously monitored-

Monitoring pauses, and the misfire counter resets, if the vehicle is driven over a rough road-

Monitoring also pauses, and the misfire counter holds at its current value, if the throttle position changes more than a predetermined value, or if driving conditions fall outside the range of any related enable criteria- Fuel System Monitor and Readiness Code

This readiness code is always set to available because the fuel system is continuously monitored during closed loop operation-

Monitoring pauses when the catalytic converter, the EVAP control system, and the A/F sensor monitors are active-

Monitoring also pauses when any related enable criteria are not being met. Monitoring resumes when the enable criteria is again being met- Comprehensive Component Monitor and Readiness Code

This readiness code is always set to available because the comprehensive component monitor is continuously running whenever the engine is cranking or running- EGR 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- Enable Criteria

ECT Sensor 1 at 176 °F (80 °C) or more- Procedure

1- Connect the HDS to the DLC- 2- Start the engine- 3- Drive at a steady speed with CVT or A/T in D or M/T in 4th at 50 62 mph (80 100 km/h) or above for more than 10 seconds- 4- With CVT or A/T in D, or M/T in 4th, decelerate from 62 mph (100 km/h) or above by completely releasing the throttle for at least 5 seconds. If the engine is stopped during this step, repeat steps 3 and 4.

5- Check the OBD status screen for DTC P0401 in the DTC s MENU with the HDS-

If it is passed, the readiness code is complete-

If it is not passed, go to step 3 and retest.

See also:
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