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Acura RL. Manual - part 521

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 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 (see
OBD STATUS ). 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

Enable Criteria



ECT SENSOR 1 at 158°F (70°C) or more.



IAT SENSOR at 14.7°F (-9.6°C) or more.



Vehicle speed sensor (VSS) reads more than 3 mph (5 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.

EVAPORATIVE EMISSIONS (EVAP) CONTROL SYSTEM MONITOR AND READINESS CODE

Enable Criteria

NOTE:



Do not turn the ignition switch off during the procedure.



All readiness codes are cleared when the battery is disconnected, DTCs
are cleared, or when 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.

NOTE:

All readiness codes are cleared when the battery is disconnected, DTCs are
cleared, or when the PCM is reset with the HDS.

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2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

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

Battery voltage is higher than 10.5 V.



Engine at idle.



ECT SENSOR 1 and 2 between 176°F (80°C) and 212°F (100°C).



MAP SENSOR less than 46.6 kPa (14 in.Hg, 350 mmHg).



Vehicle speed 0 mph (0 km/h).



IAT SENSOR between 32°F (0°C) and 212°F (100°C).

Procedure

1. Connect the HDS to the vehicle's data link connector (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 functions are normal, readiness is complete.



If the functions are 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

Enable Criteria

ECT SENSOR 1 at 158°F (70°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 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 in the ALL DATA LIST with the HDS. If the ECT is lower than
158°F (70°C), run the engine until it is higher than 158°F (70°C), then repeat the procedure.

AIR FUEL RATIO (A/F) SENSOR HEATER MONITOR READINESS CODE

NOTE:



Do not turn the ignition switch off during the procedure.



All readiness codes are cleared when the battery is disconnected, DTCs
are cleared, or when the PCM is reset with the HDS.

NOTE:

All readiness codes are cleared when the battery is disconnected, DTCs are

2007 Acura RL

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

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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

Enable Criteria

ECT SENSOR 1 at 176°F (80°C) or more.

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 transmission in D, 50-62 mph (80-100 km/h) or above for more than

10 seconds.

cleared, or when the PCM is reset with the HDS.

NOTE:



Do not turn the ignition switch off during the procedure.



All readiness codes are cleared when the battery is disconnected, DTCs
are cleared, or when the PCM is reset with the HDS.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

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4. With the transmission in D, 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 DTCs 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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2005-08 ENGINE PERFORMANCE Fuel and Emissions Systems - RL

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