Honda CR-V: 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 battery has been disconnected or gone dead, if the 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 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 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, if the 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 ºF (70 ºC) or more.
• Intake air temperature (IAT SENSOR) at 20 ºF ( -7 ºC) or more.
• Vehicle speed sensor (VSS) 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 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 Emission (EVAP) Control System Monitor and Readiness Code

NOTE: All readiness codes are cleared when the battery is disconnected, if the DTCs have been cleared, or if the PCM is reset with the HDS.

Enable Criteria

• Battery voltage is more than 10.5 V.
• Engine at idle.
• ECT SENSOR 1 and 2 between 176 ºF (80 ºC) and 212ºF (100 ºC).
• MAP sensor less than 46.6 kPa (14 in.Hg, 350 mmHg).
• Vehicle speed 0 mph (0 km/h).
• IAT SENSOR between 32 ºF (0 ºC) and 212 ºF (100 ºC).

Procedure

1. Connect the HDS to the DLC.

2. Start the engine.

3. Select EVAP TEST in the INSPECTION MENU with the HDS, then select the FUNCTION TEST in the EVAP TEST MENU.

• If the result is normal, readiness is complete.
• If the result is not normal, go to the next step.

4. Check for a Temporary DTC. 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, if the DTCs have been cleared, or if the PCM is reset with the HDS.

Enable Criteria

ECT SENSOR 1 at 140 ºF (60 ºC) 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 screen shows complete, readiness is complete.
• If the screen shows not complete, go to the next step.

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 SENSOR 2 in the ALL DATA LIST with the HDS. lf the ECT SENSOR 2 is less than 140 ºF (60 ºC), run the engine until it is more than 140 ºF (60 ºC), 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, if the 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 Temporary 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, 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.

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, if the DTCs have been cleared, or if the PCM is reset with the HDS.

Enable Criteria

ECT at 176 ºF (80 ºC) or more.

Procedure

1. Connect the HDS to the DLC.

2. Start the engine.

3. Drive at a steady speed with the transmission in D position, at 50-62 mph (80-100 km/h) or above for more than 10 seconds.

4. With the transmission in D position, 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 screen for DTC P0401 in the DTC's MENU with the HDS.

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

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