ENGINE PERFORMANCE
Fuel & Emission System Troubleshooting & Testing - 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 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 to ON (II), 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:
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During the procedure, do not turn the ignition switch to ACC (I) or LOCK
(0).
All readiness codes are cleared when the 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.
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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
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ECT SENSOR 1 at 158 Β°F (70 Β°C) or more.
IAT SENSOR at 20 Β°F (-7 Β°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 battery is disconnected, if DTCs have
been cleared, or if the PCM is reset with the HDS.
Enable Criteria
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Battery voltage is more than 10.5 V.
Engine at idle.
ECT SENSOR 1 and 2 between 176 Β°F (80 Β°C) and 212 Β°F (100 Β°C).
MAP SENSOR less than 46.6 kPa (14 inHg, 350 mmHg).
Vehicle speed 0 mph (0 km/h).
IAT SENSOR between 32 Β°F (0 Β°C) and 212 Β°F (100 Β°C).
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.
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If the result is normal, readiness is complete.
If the result is not normal, go to the next step.
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4. Check for a Pending 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:
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During the procedure, do not turn the ignition switch to ACC (I) or LOCK
(0).
All readiness codes are cleared when the battery is disconnected, if DTCs
have been cleared, or if the PCM is reset with the HDS.
Enable Criteria
ECT SENSOR 1 at 140 Β°F (60 Β°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.
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If the screen shows complete, readiness is complete.
If the screen shows not complete, go to the next step.
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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 Β°F (60 Β°C), run the engine until it is more than 140 Β°F (60 Β°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, 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
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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
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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.
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS
INTERMITTENT FAILURES
The term intermittent failure means a system may have had a failure, but it checks OK now. If the malfunction
indicator lamp (MIL) on the dash does not come on, check for poor connections or loose terminals at all
connectors related to the circuit that you are troubleshooting. If the MIL was on but then went off, the original
problem may have been intermittent.
SERVICE INFORMATION
Periodically, new PCM software or new service procedures may become available. Always check online for the
latest software or service information related to the DTCs or symptoms you are troubleshooting.
OPENS AND SHORTS
Open and short are common electrical terms. An open is a break in a wire or at a connection. A short is an
accidental connection of a wire to ground or to another wire. In simple electronics, this usually means
something won't work at all. With complex electronics (such as PCMs) this can sometimes mean something
works, but not the way it's supposed to.
HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)
1. Start the engine, and check the MIL (A).
NOTE:
If the ignition switch is turned to ON (II), and the engine is not started, the
MIL stays on for 15 -20 seconds.
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