Acura RSX Honda Integra. Manual — part 177
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S6M6AAJK72100090420FAAT00
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DTC P0420:
YES
NO
11-414
Catalytic Converter System
DTC Troubleshooting
Catalyst System Efficiency Below
Threshold
(2002-2004 models)
NOTE: If some of the DTCs listed below are stored at
the same time as DTC P0420, troubleshoot those DTCs
first, then recheck for DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
1. Reset the ECM/PCM (see page 11-4).
2. Start the engine. Hold the engine speed at
3,000 rpm without load (in Park or neutral) until the
radiator fan comes on.
3. Test-drive at 50
55 mph (80
88 km/h) for about
2 minutes. Then decelerate for at least 4 seconds
with the throttle completely closed. Then accelerate
to 55 mph (88 km/h), and try to hold the speed until
the HDS indicates FAIL or PASS as the TWC test
result.
Check the three way catalytic converter
(TWC). If necessary, replace the TWC.
Intermittent failure, system is OK at this
time.
Is the test r esult F AIL?
05/06/27 17:42:37 61S6M040_110_0414
S6M6AALK72100090420FAAT00
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DTC P0420:
YES
NO
YES
NO
YES
NO
11-415
Catalyst System Efficiency Below
Threshold
(2005-2006 models)
NOTE:
• If some of the DTCs listed below are stored at the
same time as DTC P0420, troubleshoot those DTCs
first, then recheck for DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) heater
• Poor quality fuel may cause this DTC.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at
3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.
4. Test-drive under these conditions:
• Engine coolant temperature above 158 °F (70 °C)
• A/T in D position (M/T in 5th gear)
• Vehicle speed between 45 mph (72 km/h) and
75 mph (120 km/h) for 5 minutes or more
• Maintain a vehicle speed 25 mph (40 km/h) or
more for 5 minutes with cruise control set
5. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Go to step 6.
Go to step 4 and recheck.
6. Continue test driving until a result comes on.
7. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Go to step 8.
If the screen indicates PASSED, intermittent
failure, system is OK at this time. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 4 and recheck.
8. Turn the ignition switch OFF.
9. Replace the three way catalytic converter (TWC)
(see page 9-15).
10. Turn the ignition switch ON (II).
11. Reset the ECM/PCM with the HDS.
12. Do the ECM/PCM idle learn procedure (see page
11-349).
13. Start the engine. Hold the engine speed at
3,000 rpm without load (in Park or neutral) until the
radiator fan comes on, then let it idle.
14. Test-drive for about 10 minutes, varying the vehicle
speed.
15. Check the CAT MONITOR CONDITION in the DATA
LIST with the HDS.
Go to step 16.
Go to step 13 and recheck.
16. Test-drive under these conditions:
• Engine coolant temperature above 158 °F (70 °C)
• A/T in D position (M/T in 5th gear)
• Vehicle speed between 45 mph (72 km/h) and
75 mph (120 km/h) for 5 minutes or more
• Maintain a vehicle speed 25 mph (40 km/h) or
more for 5 minutes with cruise control set
(cont’d)
Does the scr een indicate EX ECUT ING?
Does the scr een indicate F AILED?
Is the temper atur e OK ?
05/06/27 17:42:38 61S6M040_110_0415
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YES
NO
YES
NO
YES
NO
11-416
Catalytic Converter System
DTC Troubleshooting (cont’d)
17. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Go to step 18.
Go to step 16 and recheck.
18. Continue test driving until a result comes on.
19. Check for Temporary DTCs or DTCs with the HDS.
Go to the indicated DTC’s troubleshooting.
Go to step 20.
20. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Troubleshooting is complete.
If the screen indicates FAILED, check the fuel
quality. If the screen indicates EXECUTING, keep
driving until a result comes on. If the screen
indicates OUT OF CONDITION, go to step 13 and
recheck.
Does the scr een indicate EX ECUT ING?
Ar e any T empor ar y DT Cs or DT Cs indicated?
Does the scr een indicate PASSED?
05/06/27 17:42:38 61S6M040_110_0416
S6M6AACK72100092279FAAT00
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DTC P2279:
YES
NO
11-417
PCV System
DTC Troubleshooting
Intake Air System Leak Detected
(2004 model)
1. Reset the ECM/PCM (see page 11-4).
2. Start the engine. Hold the engine speed at
3,000 rpm without load (in Park or neutral) until the
radiator fan comes on.
3. Let the engine idle for at least 40 seconds with the
throttle fully closed.
4. Check for Temporary DTCs or DTCs with a scan tool
or the HDS.
Check for vacuum leaks at these parts:
• PCV valve
• PCV hose
• EVAP canister purge valve
• Throttle body
• Intake manifold
• Brake booster hose
• Intake air bypass control thermal valve
Intermittent failure, system is OK at this
time.
Is DT C P227 9 indicated ?
05/06/27 17:42:38 61S6M040_110_0417
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