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2004-08 ENGINE PERFORMANCE Catalytic Converter System - TSX <meta name="InColGX" content=""> </head> <body bgcolor="white" text="black"> <h1>2004-08 ENGINE PERFORMANCE</h1> <h1>Catalytic Converter System - TSX</h1><a name="S36887809392008080900000"></a><h2 class="clsHeadOne">Component Location Index</h2> <p><span class="clsFig"><a class="clsExtGraphicLink" onclick="ajaxModalImg($(this).attr('id'))" id="G05490850" name="S15471831332008080900000">Fig. 1: Identifying Catalytic Converter System Component Location</a><br><span class="clsCourtesyNote">Courtesy of AMERICAN HONDA MOTOR CO., INC.</span></span></p><a name="S15175658232008080900000"></a><h2 class="clsHeadOne">DTC Troubleshooting</h2><a name="S16214796962008080900000"></a><h2 class="clsHeadTwo">DTC P0420: Catalyst System Efficiency Below Threshold ('04 model)</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td> <ul class="clsBULLET"> <li>Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see <a class="clsExtHyperlink" id="A00293834_S37308099622008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot them first, then recheck for DTC P0420.<p>P0137, P0138: Secondary HO2S (Sensor 2) P0141: Secondary HO2S (Sensor 2) heater</p> </li> <li>Poor quality fuel may cause this DTC.</li> </ul> </td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Turn the ignition switch ON (II).</li> <li>Clear the DTC with the HDS.</li> <li>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.</li><a name="S15667966672008080900000"></a><li>Test-drive under these conditions:<ul class="clsBULLET"> <li>Engine coolant temperature (ECT SENSOR) above 158°F (70°C)</li> <li>A/T in D position (M/T in 5th gear)</li> <li>Vehicle speed between 50 mph (80 km/h) and 55 mph (88 km/h) with cruise control set</li> <li>Drive about 2 minutes, decelerate for at least 4 seconds with the throttle completely closed, then maintain 55 mph (88 km/h) for 20 minutes with cruise control set</li> </ul> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate EXECUTING?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 6.</p> <p><span class="clsEmphBOLD">NO</span> - If the screen indicates OUT OF CONDITION, go to step <a class="clsListItemLink" href="#S15667966672008080900000">4</a> and recheck. If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates FAILED, go to step <a class="clsListItemLink" href="#S12705556622008080900000">8</a>.</p> </li> <li>Continue test driving until a result comes on.</li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate FAILED?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 8.</p> <p><span class="clsEmphBOLD">NO</span> - 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 <a class="clsListItemLink" href="#S15667966672008080900000">4</a> and recheck.</p> </li><a name="S12705556622008080900000"></a><li>Turn the ignition switch OFF.</li> <li>Replace the TWC (see <a class="clsExtHyperlink" id="A00293820_S08169320862008080900000">EXHAUST PIPE AND MUFFLER REPLACEMENT</a> ).</li> <li>Turn the ignition switch ON (II).</li> <li>Reset the ECM/PCM with the HDS.</li> <li>Do the ECM/PCM idle learn procedure (see <a class="clsExtHyperlink" id="A00293811_S22980909672008080900000">ECM/PCM IDLE LEARN PROCEDURE</a> ).</li><a name="S16277118172008080900000"></a><li>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.</li> <li>Test-drive for about 10 minutes, varying the vehicle speed.</li> <li>Check the CATA MONITOR CONDITION in the DATA LIST with the HDS.<p><span class="clsEmphITAL">Is the temperature OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 16.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S16277118172008080900000">13</a> and recheck.</p> </li><a name="S27266464032008080900000"></a><li>Test-drive under these conditions:<ul class="clsBULLET"> <li>Engine coolant temperature (ECT SENSOR) above 158°F (70°)</li> <li>A/T in D position (M/T in 5th gear)</li> <li>Vehicle speed between 50 mph (80 km/h) and 55 mph (88 km/h) with cruise control set</li> <li>Drive about 2 minutes, decelerate for at least 4 seconds with the throttle completely closed, then maintain 55 mph (88 km/h) for 20 minutes with cruise control set</li> </ul> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen Indicate EXECUTING?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 18.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S27266464032008080900000">16</a> and recheck.</p> </li> <li>Continue test driving until a result comes on.</li> <li>Check for Temporary DTCs or DTCs with the HDS.<p><span class="clsEmphITAL">Are any Temporary DTCs or DTCs indicated?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to the indicated DTCs troubleshooting.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step 20.</p> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate PASSED?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Troubleshooting is complete.</p> <p><span class="clsEmphBOLD">NO</span> - 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 <a class="clsListItemLink" href="#S16277118172008080900000">13</a>.</p> </li> </ol><a name="S23672694882008080900000"></a><h2 class="clsHeadTwo">DTC P0420: Catalyst System Efficiency Below Threshold ('05-08 models)</h2> <p><span class="clsNote"><table> <tr> <td class="clsNoteLabel"><span>NOTE:</span></td> <td> <ul class="clsBULLET"> <li>Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see <a class="clsExtHyperlink" id="A00293834_S37308099622008080900000">GENERAL TROUBLESHOOTING INFORMATION</a> ).</li> <li>If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot them first, then recheck for DTC P0420.<p>P0137, P0138: Secondary HO2S (Sensor 2)</p> <p>P0141: Secondary HO2S (Sensor 2) heater</p> </li> <li>Poor quality fuel may cause this DTC.</li> </ul> </td> </tr> </table></span></p> <ol class="clsARABICNUM"> <li>Turn the ignition switch ON (II).</li> <li>Clear the DTC with the HDS.</li> <li>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.</li><a name="S42885644452008080900000"></a><li>Test-drive under these conditions:<ul class="clsBULLET"> <li>Engine coolant temperature (ECT SENSOR) ('05 model), ECT SENSOR 1 ('06-08 models) above 158°F (70°C)</li> <li>A/T in D position (M/T in 5th gear)</li> <li>Vehicle speed between 45-75 mph (72 - 120 km/h) for 5 minutes or more with cruise control set</li> <li>Maintain the vehicle speed at 55 mph (88 km/h) for 5 minutes or more with cruise control set</li> </ul> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate EXECUTING?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 6.</p> <p><span class="clsEmphBOLD">NO</span> - If the screen indicates OUT OF CONDITION, go to step <a class="clsListItemLink" href="#S42885644452008080900000">4</a> and recheck. If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates FAILED, go to step <a class="clsListItemLink" href="#S15716183952008080900000">8</a>.</p> </li> <li>Continue test driving until a result comes on.</li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen Indicate FAILED?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 8.</p> <p><span class="clsEmphBOLD">NO</span> - 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 <a class="clsListItemLink" href="#S42885644452008080900000">4</a> and recheck.</p> </li><a name="S15716183952008080900000"></a><li>Turn the ignition switch OFF.</li> <li>Replace the TWC (see <a class="clsExtHyperlink" id="A00293820_S08169320862008080900000">EXHAUST PIPE AND MUFFLER REPLACEMENT</a> ).</li> <li>Turn the ignition switch ON (II).</li> <li>Reset the ECM/PCM with the HDS.</li> <li>Do the ECM/PCM idle learn procedure (see <a class="clsExtHyperlink" id="A00293811_S22980909672008080900000">ECM/PCM IDLE LEARN PROCEDURE</a> ).</li><a name="S05416237512008080900000"></a><li>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.</li> <li>Test-drive for about 10 minutes, varying the vehicle speed.</li> <li>Check the CATA MONITOR CONDITION in the DATA LIST with the HDS.<p><span class="clsEmphITAL">Is the temperature OK?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 16.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S05416237512008080900000">13</a> and recheck.</p> </li><a name="S05836484532008080900000"></a><li>Test-drive under these conditions:<ul class="clsBULLET"> <li>Engine coolant temperature (ECT SENSOR) ('05 model), ECT SENSOR 1 ('06-08 models) above 158°F (70°C)</li> <li>A/T in D position (M/T in 5th gear)</li> <li>Vehicle speed at 45-75 mph (72-120 km/h) for 5 minutes or more with cruise control set</li> <li>Maintain the vehicle speed at 55 mph (88 km/h) for 5 minutes or more with cruise control set</li> </ul> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate EXECUTING?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to step 18.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step <a class="clsListItemLink" href="#S05836484532008080900000">16</a> and recheck.</p> </li> <li>Continue test driving until a result comes on.</li> <li>Check for Temporary DTCs or DTCs with the HDS.<p><span class="clsEmphITAL">Are any Temporary DTCs or DTCs indicated?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Go to the indicated DTCs troubleshooting.</p> <p><span class="clsEmphBOLD">NO</span> - Go to step 20.</p> </li> <li>Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.<p><span class="clsEmphITAL">Does the screen indicate PASSED?</span> </p> <p><span class="clsEmphBOLD">YES</span> - Troubleshooting is complete.</p> <p><span class="clsEmphBOLD">NO</span> - 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 <a class="clsListItemLink" href="#S05416237512008080900000">13</a>.</p> </li> </ol> </body> </html>

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CATALYTIC CONVERTER SYSTEM
  • HEADINGS
    • Component Location Index
    • DTC Troubleshooting
      • DTC P0420: Catalyst System Efficiency Below Threshold ('04 model)
      • DTC P0420: Catalyst System Efficiency Below Threshold ('05-08 models)
  • FIGURES
    • Fig. 1: Identifying Catalytic Converter System Component Location
  • TABLES

2004-08 ENGINE PERFORMANCE

Catalytic Converter System - TSX

Component Location Index

Fig. 1: Identifying Catalytic Converter System Component Location
Courtesy of AMERICAN HONDA MOTOR CO., INC.

DTC Troubleshooting

DTC P0420: Catalyst System Efficiency Below Threshold ('04 model)

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, 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 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 (ECT SENSOR) above 158°F (70°C)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed between 50 mph (80 km/h) and 55 mph (88 km/h) with cruise control set
    • Drive about 2 minutes, decelerate for at least 4 seconds with the throttle completely closed, then maintain 55 mph (88 km/h) for 20 minutes with cruise control set
  5. Monitor the OBD STATUS for DTC P0420 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.

  6. Continue test driving until a result comes on.
  7. Monitor the OBD STATUS for DTC P0420 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 OFF.
  9. Replace the TWC (see EXHAUST PIPE AND MUFFLER REPLACEMENT ).
  10. Turn the ignition switch ON (II).
  11. Reset the ECM/PCM with the HDS.
  12. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  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 CATA MONITOR CONDITION in the DATA LIST with the HDS.

    Is the temperature OK?

    YES - Go to step 16.

    NO - Go to step 13 and recheck.

  16. Test-drive under these conditions:
    • Engine coolant temperature (ECT SENSOR) above 158°F (70°)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed between 50 mph (80 km/h) and 55 mph (88 km/h) with cruise control set
    • Drive about 2 minutes, decelerate for at least 4 seconds with the throttle completely closed, then maintain 55 mph (88 km/h) for 20 minutes with cruise control set
  17. Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.

    Does the screen Indicate EXECUTING?

    YES - Go to step 18.

    NO - 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.

    Are any Temporary DTCs or DTCs indicated?

    YES - Go to the indicated DTCs troubleshooting.

    NO - Go to step 20.

  20. Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED?

    YES - Troubleshooting is complete.

    NO - 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.

DTC P0420: Catalyst System Efficiency Below Threshold ('05-08 models)

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, 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 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 (ECT SENSOR) ('05 model), ECT SENSOR 1 ('06-08 models) above 158°F (70°C)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed between 45-75 mph (72 - 120 km/h) for 5 minutes or more with cruise control set
    • 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 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.

  6. Continue test driving until a result comes on.
  7. Monitor the OBD STATUS for DTC P0420 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 OFF.
  9. Replace the TWC (see EXHAUST PIPE AND MUFFLER REPLACEMENT ).
  10. Turn the ignition switch ON (II).
  11. Reset the ECM/PCM with the HDS.
  12. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  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 CATA MONITOR CONDITION in the DATA LIST with the HDS.

    Is the temperature OK?

    YES - Go to step 16.

    NO - Go to step 13 and recheck.

  16. Test-drive under these conditions:
    • Engine coolant temperature (ECT SENSOR) ('05 model), ECT SENSOR 1 ('06-08 models) above 158°F (70°C)
    • A/T in D position (M/T in 5th gear)
    • Vehicle speed at 45-75 mph (72-120 km/h) for 5 minutes or more with cruise control set
    • Maintain the vehicle speed at 55 mph (88 km/h) for 5 minutes or more with cruise control set
  17. Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.

    Does the screen indicate EXECUTING?

    YES - Go to step 18.

    NO - 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.

    Are any Temporary DTCs or DTCs indicated?

    YES - Go to the indicated DTCs troubleshooting.

    NO - Go to step 20.

  20. Monitor the OBD STATUS for DTC P0420 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED?

    YES - Troubleshooting is complete.

    NO - 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.

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