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Catalytic Converter System (v6) Acura TSX II

Exhaust 4 illustrations ~1032 words

Scheme 18

Scheme 18: Component Location Index
Scheme 18: Component Location Index

DTC P0420: Rear Bank Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Front Bank Catalyst System Efficiency Below Threshold (Bank 2)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If some of the DTCs listed below are stored at the same time as DTC P0420 and/or P0430", troubleshoot those DTCs first, then recheck for DTC P0420 and/or P0430*. P0137, P0138, P0157", P0158*: Secondary HO2S (Sensor 2) P0141, P0161": Secondary HO2S (Sensor 2) heater Poor quality fuel can cause these DTCs. Information marked with an asterisk (*) applies to the front bank (Bank 2).

  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 (in P or N) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed between 45-75 mph (72-120 km/h) for 5 minutes or more with cruise control set Vehicle speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with throttle fully closed). Repeat this 3 times or more Maintain the vehicle speed at 55 mph (88 km/h) for 5 minutes or more with cruise control set
  5. Monitor the OBD STATUS for DTC P0420 and/or P0430* in the DTCs MENU with the HDS. Does the screen indicate EXECUTING? YES -Go to step 6 . NO -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 and recheck.
  6. Continue test driving until a result comes on.
  7. Monitor the OBD STATUS for DTC P0420 and/or P0430* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 8 . NO -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 WU-TWC: For DTC P0420, replace the rear WU-TWC (Bank 1) (see «REAR (BANK 1)»(/acura/tsx/ii-2008-2014/remont/exhaust/#catalytic-converter-system-v6) ). For DTC P0430, replace the front WU-TWC (Bank 2) (see «WARM UP TWC REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/exhaust/#catalytic-converter-system-v6) ).
  10. Turn the ignition switch to ON (II).
  11. Reset the PCM with the HDS.
  12. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-v6__pcm-idle-learn-procedure) ).
  13. Test-drive for about 10 minutes, continually changing the vehicle speed.
  14. Check the CATA MONITOR CONDITION B1 (B2)* in the DATA LIST with the HDS. Is the condition OK? YES -Go to step 15 . NO -Go to step 13 and recheck.
  15. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Vehicle speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with throttle fully closed). Repeat this 3 times or more Maintain the vehicle speed at 55 mph (88 km/h) for 5 minutes or more with cruise control set
  16. Continue test driving until a result comes on.
  17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0420 and/or P0430* indicated? YES -Check the fuel quality, then go to step 1 . NO -Go to step 18 .
  18. Monitor the OBD STATUS for DTC P0420 and/or P0430* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 17 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check the fuel quality, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 15 .

Scheme 19

Scheme 19: FRONT (Bank 2)
Scheme 19: FRONT (Bank 2)
  1. Remove the No. 2 the ignition coil (A) and the ignition coil heat insulator (B).
  2. Remove the front A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__af-sensor-replacement) ) and front secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__secondary-ho2s-replacement) ).
  3. Remove the exhaust pipe A mounting nuts (front WU-TWC side) (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exhaust/#intake-manifold-and-exhaust-system-v6__exhaust-pipe-and-muffler-replacement) ).
  4. Remove the EGR pipe (see «EGR PIPE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/auxiliary-emission-control-systems/#egr-system-v6) ).
  5. Remove the A/C condenser fan assembly (see «FAN, FAN MOTOR, AND SHROUD REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-v6) ) and the radiator upper bracket/cushion (see «FAN, FAN MOTOR, AND SHROUD REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-v6) ).
  6. Remove the front WU-TWC bracket (C), then carefully remove the front WU-TWC (D).
  7. Remove the converter covers (E).
  8. Carefully install the front WU-TWC with a new gasket (F) and new self-locking nuts (G). Tighten the nuts in a crisscross pattern in two or three steps.
  9. Install the parts in the reverse order of removal.

Scheme 20

Scheme 20: REAR (Bank 1)
Scheme 20: REAR (Bank 1)
  1. Remove the strut brace.
  2. Remove the cowl cover (see «COWL COVER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exteriorinterior-trim/#exterior-trim-v6__cowl-cover-replacement) ).
  3. Remove the engine wire harness holder mounting bolts (A).
  4. Remove the No. 4 ignition coil (B) and the ignition coil heat insulator (C).
  5. Remove the P/S heat shield (see «INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-v6) ).
  6. Remove the rear A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__af-sensor-replacement) ) and rear secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-v6__secondary-ho2s-replacement) ).
  7. Remove the exhaust pipe A mounting nuts (rear WU-TWC side) (see «EXHAUST PIPE AND MUFFLER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exhaust/#intake-manifold-and-exhaust-system-v6__exhaust-pipe-and-muffler-replacement) ).
  8. Remove the rear WU-TWC bracket (D), then carefully remove the rear WU-TWC (E).
  9. Remove the converter covers (F).
  10. Carefully install the rear WU-TWC with a new gasket (G) and new self-locking nuts (H). Tighten the nuts in a crisscross pattern in two or three steps.
  11. Install the parts in the reverse order of removal.

Scheme 21

Scheme 21: Under-Floor TWC Removal/Installation
Scheme 21: Under-Floor TWC Removal/Installation
  1. Raise the vehicle on a lift.
  2. Remove the exhaust pipe hangers (A).
  3. Remove the under-floor TWC (B).
  4. Remove the converter cover (C).
  5. Install the parts in the reverse order of removal with new gaskets (D) and new self-locking nuts (E).

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