Acura CSX. Instruction — page 171

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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

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 ?

08/08/21 14:31:13 61SNR030_110_0353

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?

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01

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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).

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