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EGR System Acura RL II

Auxiliary Emission Control Systems 22 illustrations ~3355 words

Scheme 63

Scheme 63: Component Location Index
Scheme 63: Component Location Index

DTC P0401: EGR Insufficient Flow

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

  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. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Go to step 5. NO - Go to step 7 .
  5. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Vehicle speed at 25 mph (40 km/h) or more, and engine speed between 1,100 RPM and 3,000 RPM During the drive, decelerate (with the throttle fully closed) for 5 seconds
  6. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Remove the engine cover (see step 1 under «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/rl/ii-2004-2008/remont/exhaust/#intake-manifold-and-exhaust-system) ), and clean the intake manifold EGR port with throttle plate and induction cleaner, then go to step 9 . 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 5 and recheck.
  7. Turn the ignition switch OFF.
  8. Replace the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  9. Turn the ignition switch ON (II).
  10. Reset the PCM with the HDS.
  11. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Vehicle speed at 25 mph (40 km/h) or more, and engine speed between 1,100 RPM and 3,000 RPM During the drive, decelerate (with the throttle fully closed) for 5 seconds
  13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0401 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1 . NO - Go to step 14.
  14. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 13 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM, 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 12 .
  15. Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
  16. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Vehicle speed at 25 mph (40 km/h) or more, and engine speed between 1,100 RPM and 3,000 RPM During the drive, decelerate (with the throttle fully closed) for 5 seconds
  17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0401 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 16 . If the PCM was substituted, go to step 1 . NO - Go to step 18.
  18. Monitor the OBD STATUS for DTC P0401 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 17 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 16 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 16 .

DTC P0404: EGR Control Circuit Range/ Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 64

Scheme 64: DTC P0404: EGR Control Circuit Range/ Performance Problem
Scheme 64: DTC P0404: EGR Control Circuit Range/ Performance Problem

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Scheme 69
  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. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Intermittent failure, the system is OK at this time. Clean any carbon build-up on the EGR valve with throttle plate and induction cleaner. NO - Go to step 5.
  5. Turn the ignition switch OFF.
  6. Disconnect the EGR valve 6P connector.
  7. Measure resistance between EGR valve 6P connector terminals No. 1 and No. 2. Is there 100 kohms or more? YES - Go to step 26 . NO - Go to step 8.
  8. At the EGR valve side, measure resistance between EGR valve 6P connector terminals No. 1 and No. 3. Is there 100 kohms, or more? YES - Go to step 26 . NO - Go to step 9.
  9. Check for continuity between EGR valve 6P connector terminal No. 6 and body ground. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the EGR valve and G101, then go to step 27 .
  10. Jump the SCS line with the HDS.
  11. Disconnect PCM connector B (24P).
  12. Check for continuity between PCM connector terminal B5 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B5) and the EGR valve, then go to step 27 . NO - Go to step 13.
  13. Connect EGR valve 6P connector terminal No. 4 to body ground with a jumper wire.
  14. Check for continuity between PCM connector terminal B5 and body ground. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the PCM (B5) and the EGR valve, then go to step 27 .
  15. Remove the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  16. Clean the intake manifold EGR port with throttle plate and induction cleaner. Also, clean the passage inside the EGR valve with throttle plate and induction cleaner.
  17. Install the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  18. Reconnect the EGR valve 6P connector.
  19. Reconnect PCM connector B (24P).
  20. Turn the ignition switch ON (II).
  21. Reset the PCM with the HDS.
  22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  23. 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.
  24. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Go to step 33 . NO - Go to step 25.
  25. Turn the ignition switch OFF.
  26. Replace the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  27. Reconnect all connectors.
  28. Turn the ignition switch ON (II).
  29. Reset the PCM with the HDS.
  30. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  31. 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.
  32. Do the EGR TEST in the INSPECTION MENU with the HDS.
  33. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0404 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1 . NO - Go to step 33.
  34. Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 33 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM, 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 31 .
  35. Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
  36. 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.
  37. Do the EGR TEST in the INSPECTION MENU with the HDS.
  38. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0404 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 36 . If the PCM was substituted, go to step 1 . NO - Go to step 39.
  39. Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 38 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 36 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 36 .

DTC P0406: EGR Valve Position Sensor Circuit High Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 70

Scheme 70: DTC P0406: EGR Valve Position Sensor Circuit High Voltage
Scheme 70: DTC P0406: EGR Valve Position Sensor Circuit High Voltage

Scheme 71

Scheme 71
Scheme 71
  1. Turn the ignition switch ON (II).
  2. Check the EGR VLS in the DATA LIST with the HDS. Is 4.88 V or more indicated? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM.
  3. Turn the ignition switch OFF.
  4. Disconnect the EGR valve 6P connector.
  5. Turn the ignition switch ON (II).
  6. Measure voltage between EGR valve 6P connector terminals No. 2 and No. 3. Is there about 5 V? YES - Go to step 8 . NO - Go to step 7.
  7. Measure voltage between PCM connector terminals C12 and C14. Is there about 5 V? YES - Repair open in the wire between the EGR valve and the PCM (C12), then go to step 10 . NO - Go to step 14 .
  8. Turn the ignition switch OFF.
  9. Replace the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  10. Turn the ignition switch ON (II).
  11. Reset the PCM with the HDS.
  12. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0406 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
  14. Reconnect all connectors.
  15. Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
  16. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0406 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).

Scheme 72

Scheme 72: DTC P2413: EGR System Malfunction
Scheme 72: DTC P2413: EGR System Malfunction

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  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. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM. NO - Go to step 5.
  5. Turn the ignition switch OFF.
  6. Turn the ignition switch ON (II).
  7. Check the EGR VLS in the DATA LIST with the HDS. Is about 0 V indicated? YES - Go to step 8. NO - Go to step 19 .
  8. Turn the ignition switch OFF.
  9. Disconnect the EGR valve 6P connector.
  10. Turn the ignition switch ON (II).
  11. Measure voltage between EGR valve 6P connector terminal No. 3 and body ground. Is there about 5 V? YES - Go to step 13 . NO - Go to step 12.
  12. Measure voltage between PCM connector terminal C14 and body ground. Is there about 5 V? YES - Repair open in the wire between the EGR valve and the PCM (C14), then go to step 44 . NO - Go to step 51 .
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HDS.
  15. Disconnect PCM connector C (22P).
  16. Check for continuity between PCM connector terminal C13 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C13) and the EGR valve, then go to step 44 . NO - Go to step 17.
  17. Connect EGR valve 6P connector terminal No. 1 to body ground with a jumper wire.
  18. Check for continuity between PCM connector terminal C13 and body ground. Is there continuity? YES - Go to step 19. NO - Repair open in the wire between the PCM (C13) and the EGR valve, then go to step 44 .
  19. Turn the ignition switch OFF.
  20. Disconnect the EGR valve 6P connector.
  21. Measure resistance between EGR valve 6P connector terminals No. 1 and No. 2. Is there continuity or resistance of 100 k ohms or more? YES - Go to step 43 . NO - Go to step 22.
  22. At the EGR valve side, measure resistance between EGR valve 6P connector terminals No. 1 and No. 3. Is there 100 kohms, or more? YES - Go to step 43 . NO - Go to step 23.
  23. Jump the SCS line with the HDS.
  24. Disconnect PCM connector B (24P). (Skip this step if the connector is already disconnected.)
  25. Check for continuity between PCM connector terminal B5 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B5) and the EGR valve, then go to step 44 . NO - Go to step 26.
  26. Connect EGR valve 6P connector terminal No. 4 to body ground with a jumper wire.
  27. Check for continuity between PCM connector terminal B5 and body ground. Is there continuity? YES - Go to step 28. NO - Repair open in the wire between the PCM (B5) and the EGR valve, then go to step 44 .
  28. Remove the jumper wire from the EGR valve 6P connector.
  29. Check for continuity between EGR valve 6P connector terminal No. 6 and body ground. Is there continuity? YES - Go to step 30. NO - Repair open in the wire between the EGR valve and G101, then go to step 44 .
  30. Reconnect PCM connectors B (24P) and C (22P).
  31. Connect the positive battery terminal to EGR valve 6P connector terminal No. 4 with a jumper wire.
  32. Start the engine, and let it idle, then connect the negative battery terminal to EGR valve 6P connector terminal No. 6 with a jumper wire. Does the engine stall or run rough? YES - Go to step 51 . NO - Go to step 33.
  33. Turn the ignition switch OFF.
  34. Remove the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  35. Clean the intake manifold EGR port and clean the passage inside the EGR valve with throttle plate and induction cleaner.
  36. Install the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  37. Reconnect the EGR valve 6P connector.
  38. Turn the ignition switch ON (II).
  39. Reset the PCM with the HDS.
  40. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  41. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK? YES - Go to step 49 . NO - Go to step 42.
  42. Turn the ignition switch OFF.
  43. Replace the EGR valve (see «EGR VALVE REPLACEMENT»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#egr-system) ).
  44. Reconnect all connectors.
  45. Turn the ignition switch ON (II).
  46. Reset the PCM with the HDS.
  47. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rl/ii-2004-2008/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
  48. Do the EGR TEST in the INSPECTION MENU with the HDS.
  49. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2413 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1 . NO - Go to step 50.
  50. Monitor the OBD STATUS for DTC P2413 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 49 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM, then go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.
  51. Turn the ignition switch OFF.
  52. Reconnect all connectors.
  53. Update the PCM if it does not have the latest software (see «UPDATING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__updating-the-pcm) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ).
  54. Do the EGR TEST in the INSPECTION MENU with the HDS.
  55. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2413 indicated? YES - Check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 56.
  56. Monitor the OBD STATUS for DTC P2413 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rl/ii-2004-2008/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 51 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EGR valve and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rl/ii-2004-2008/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.

Scheme 84

Scheme 84: EGR Valve Replacement
Scheme 84: EGR Valve Replacement
  1. Remove the engine cover (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/rl/ii-2004-2008/remont/ignition-system/#ignition-system) ).
  2. Disconnect the EGR valve 6P connector (A).
  3. Remove the EGR valve (B).
  4. Install the parts in the reverse order of removal with a new gasket (C).

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