Acura CSX. Manual — part 171
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SNR9A00A20316100000DAAT00
11-352
Catalytic Converter System
Component Location Index
THREE WAY CATALYTIC CONVERTER (TWC)
ENGINE CONTROL MODULE (ECM)/
POWERTRAIN CONTROL MODULE (PCM)
Removal/Installation, page 11-355
Update, page 11-227
Substitution, page 11-7
Replacement, page 11-228
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SNR9AA7K72100090420FAAT00
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DTC P0420:
YES
NO
YES
NO
YES
NO
11-353
DTC Troubleshooting
Catalyst System Efficiency Below
Threshold
NOTE:
• Before you troubleshoot, record all freeze data and
any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
• If some of the DTCs listed below are stored at the
same time as DTC P0420, troubleshoot them 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 to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at
3,000 rpm without load (A/T in P or N, M/T in
neutral) until the radiator fan comes on, then let it
idle.
4. Test-drive under these conditions:
• Engine coolant temperature (ECT SENSOR 1)
above 70 °C (158 °F)
• A/T in D, M/T in 5th
• Vehicle speed between 72
120 km/h (45
75 mph) for 5 minutes or more with cruise
control set
• K20Z2 engine: Maintain the vehicle speed at
88 km/h (55 mph) for 5 minutes or more with
cruise control set
• K20Z3 engine: Maintain the vehicle speed at
88 km/h (55 mph) for 30 seconds or more
5. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Go to step 6.
If the screen indicates OUT OF CONDITION,
go to step 4 and recheck. If the screen indicates
PASSED, intermittent failure, the system is OK at
this time. If the screen indicates FAILED, go to step
8.
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, the 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 to LOCK (0).
9. Replace the TWC (see page 11-355).
10. Turn the ignition switch to ON (II).
11. Reset the ECM/PCM with the HDS.
12. Do the ECM/PCM idle learn procedure (see page
11-310).
13. Start the engine. Hold the engine speed at
3,000 rpm without load (A/T in P or N, M/T in
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 CATA 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 (ECT SENSOR 1)
above 70 °C (158 °F)
• A/T in D, M/T in 5th
• K20Z2 engine: Vehicle speed at 88 km/h (55mph)
for 5 minutes or more with cruise control set
• K20Z3 engine: Vehicle speed at 88 km/h (55mph)
for 30 seconds or more
Does the scr een indicate EX ECUT ING?
Does the scr een indicate F AILED?
Is the condition OK ?
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YES
NO
YES
NO
YES
NO
11-354
Catalytic Converter System
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.
Check the fuel quality, then go to step 1.
Go to step 20.
20. Monitor the OBD STATUS for DTC P0420 in the
DTCs MENU with the HDS.
Troubleshooting is complete. If any other
Temporary DTCs or DTCs were indicated in step 19,
go to the indicated DTC’s troubleshooting.
If the screen indicates FAILED, check for poor
connections or loose terminals at the secondary
HO2S (Sensor 2) and the ECM/PCM. If the screen
indicates EXECUTING, keep driving until a result
comes on. If the screen indicates OUT OF
CONDITION, go to step 13.
Does the scr een indicate EX ECUT ING?
Is DT C P0420 indicated?
Does the scr een indicate PASSED?
08/08/21 14:31:13 61SNR030_110_0354
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SNR9A00A20316116201KDAT00
11-355
Catalytic Converter Removal/Installation
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
22 N·m
(2.2 kgf·m, 16 lbf·ft)
A
B
C
C
D
33 N·m
(3.4 kgf·m,
25 lbf·ft)
B
1. Remove the A/F sensor (Sensor 1) (see page
11-221).
2. Remove the secondary HO2S (Sensor 2) (see page
11-221).
3. Remove the catalytic converter (A).
4. Remove the converter cover (B).
5. Install the parts in the reverse order of removal
with new gaskets (C) and new self-locking nuts (D).
08/08/21 14:31:14 61SNR030_110_0355
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