Monitors, Trips, Drive Cycles and Readiness Codes
How to Set Readiness CodesMalfunction 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 battery has been disconnected or gone dead, if the DTCs have been cleared, or if the ECM has been reset, these readiness codes are reset. 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 ignition switch ON (II), but do not start the engine. The MIL will come 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 readiness 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 code, the current data list of the enable criteria, and the status of the readiness testing.
Catalytic Converter Monitor and Readiness Code
NOTE:
- Do not turn the ignition switch off during the procedure.
- All readiness codes are cleared when the battery is disconnected, or when the ECM is reset, or when the DTC as been cleared 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 at 158 °F (70 °C) or higher.
- Intake air temperature (IAT) at -13 °F (-25 °C) or higher.
- Vehicle speed above 30 mph (48 km/h).
Procedure
1. Connect the HDS to the vehicle's data link connector (DLC), and bring up the READINESS CODE 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 completed.
4. If the readiness code is still not set to complete, check for a temporary DTC with the HDS. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.
Evaporative Emissions (EVAP) Control System Monitor and Readiness Code
NOTE: All readiness codes are cleared when the battery is disconnected or when the ECM is cleared with the HDS.
AT-PZEV (SULEV) model
Enable Criteria
- Battery voltage higher than 10.5 V.
- Fuel level between 60 % and 90 %.
- IAT sensor between 40 °F (4 °C) and 95 °F (35 °C).
Procedure
1. Make sure the ignition switch is off.
2. Let the vehicle sit for more than 8 hours.
3. Connect the HDS to the vehicle's data link connector (DLC).
4. Remove the fuel fill cap, and release the fuel tank pressure.
5. Install the fuel fill cap.
6. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
7. Drive about 2 minutes on a highway. Keep the vehicle at a steady speed between 50 mph (80 km/h) and 70 mph (114 km/h) without abrupt acceleration, deceleration, and turns.
8. Monitor the OBD STATUS for DTC P0442 with the HDS. If the screen indicates PASSED, go to step 9. If the screen indicates EXECUTING or FAILED, check the IAT in the DATA LIST with the HDS. If the IAT is below 40 °F (4 °C), go to step 10. If the IAT meets the enable criteria, repeat from step 7.
9. If the readiness code is still not set to complete, check for DTCs or temporary DTCs. If there are no DTCs, one or more of the enable criteria was not met. Check the enable criteria again, and repeat from step 4.
10. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
11. Drive about 5 minutes on a highway. Keep the vehicle at a steady speed between 50 mph (80 km/h) and 70 mph (114 km/h) without abrupt acceleration, deceleration, and turns.
12. Repeat step 11 two more times, then go to step 8.
ULEV model
Enable Criteria
- ECT at 158 °F (70 °C) or higher.
- IAT at 20 °F (-7 °C) or higher.
- Vehicle speed is steady, and vehicle speed sensor (VSS) reads more then 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 completed.
4. If the readiness code is still not set to complete, check for a temporary DTC with the HDS. If there is no DTC, one or more of the enable criteria were probably not met; repeat the procedure.
Air Fuel Ratio (A/F) Sensor Monitor and Readiness Code
NOTE:
- Do not turn the ignition switch off during the procedure.
- All readiness codes are cleared when the battery is disconnected or when the ECM is reset with the HDS.
Enable Criteria
ECT at 140 °F (60 °C) or higher.
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 code screen for the air fuel ratio (A/F) sensor in the DTCs MENU with the HDS.
- If the screen shows complete, readiness is complete.
- If the screen shows not complete, go step 4.
4. Check for a Temporary DTC. If there is no DTC, the enable criteria was probably not met. Select the DATA LIST Menu. Check the ECT in the ALL DATA LIST with the HDS. If the ECT is lower than 140 °F (60 °C), run the engine until it is higher 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 battery is disconnected or when the ECM 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 temporary DTC. If there is no DTC, repeat the procedure.
EGR Monitor and Readiness Code
NOTE:
- Do not turn the ignition switch off during the procedure.
- All readiness codes are cleared when the battery is disconnected or when the ECM is reset with the HDS.
Enable Criteria
ECT at 158 °F (70 °C) or higher
Procedure
1. Connect the HDS to the vehicle's data link connector (DLC).
2. Start the engine.
3. Drive at a steady speed with the CVT in D position or M/T in 4th gear, 50-62 mph (80-100 km/h) or above, for more than 10 seconds.
4. With the CVT in D position or M/T in 4th gear, 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 procedure, go to step 3 and do the procedure again.
5. Check the OBD status for DTC P0401 in the DTCs MENU with the HDS.
- If it is PASSED, readiness is complete.
- If it is not PASSED, go to step 3 and retest.
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, EVAP control system, and 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.