Pgm-Fi System Acura MDX II

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DTC P0101: MAF Sensor 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 ). If DTC P1128, P1129, P2228, and/or P2229 are stored at the same time as DTC P0101, troubleshoot those DTCs first, then recheck for DTC P0101.

1. Check for poor connections or damage to these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Air intake duct Are the parts OK? YES - Go to step 2. NO - Repair or replace the damaged parts, then go to step 15 .
2. Check for damage or looseness at the air duct in the air cleaner. Is it OK? YES - Go to step 3. NO - Reconnect or replace the air duct in the air cleaner, then go to step 15 .
3. Check for a dirty air cleaner element. Is it dirty? YES - Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ), then go to step 15 . NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (II).
6. Check the MAF SENSOR in the DATA LIST with the HDS. Is there about 0.2 gm/s or 0.5 V? YES - Go to step 7. NO - Go to step 13 .
7. Start the engine.
8. Vary the engine speed between 2,000 rpm and 3,000 rpm.
9. Check the MAF SENSOR in the DATA LIST with the HDS. Does the reading change? YES - Go to step 10. NO - Go to step 13 .
10. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
11. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS MAP SENSOR MAF SENSOR
12. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 13. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 11 and recheck.
13. Turn the ignition switch OFF.
14. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS MAP SENSOR MAF SENSOR
19. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0101 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO - Go to step 20.
20. Monitor the OBD STATUS for DTC P0101 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 19 , go to the indicated DTCs troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAF sensor/ IAT sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 18 .

DTC P0102: MAF Sensor Circuit Low Voltage

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

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1. Turn the ignition switch ON (II), and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 gm/s, or 0.1 V or less 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 MAF sensor/I AT sensor and the PCM.
3. Check the No. 18 ACG (10 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 4. NO - Repair short in the wire between the MAF sensor and the No. 18 ACG (10 A) fuse. Also replace the No. 18 ACG (10 A) fuse, then go to step 20 .
4. Turn the ignition switch OFF.
5. Disconnect the MAF sensor/IAT sensor 5P connector.
6. Turn the ignition switch ON (II).
7. Measure voltage between MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground. Is there battery voltage? YES - Go to step 8. NO - Repair open in the wire between the No. 18 ACG (10 A) fuse and the MAF sensor, then go to step 20 .
8. Turn the ignition switch OFF.
9. Measure resistance between MAF sensor/IAT sensor 5P connector terminal No. 3 and body ground. Is there 190-210 kohms? YES - Go to step 14 . NO - Go to step 10.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector A (49P).
12. Check for continuity between PCM connector terminal A20 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A20) and the MAF sensor, then go to step 21 . NO - Go to step 13.
13. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 3 and PCM connector terminal A20. Is there continuity? YES - Go to step 26 . NO - Repair open in the wire between the PCM (A20) and the MAF sensor, then go to step 21 .
14. Substitute a known-good MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Clear the DTC with the HDS.
18. Start the engine. Hold the engine speed at 2,000 rpm without load (in Park or neutral).
19. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES - Go to step 26 . NO - Replace the original MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 20.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 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.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0102 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0103: MAF 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 ).

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1. Turn the ignition switch ON (II), and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 202 gm/s, or 4.89 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 MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch OFF.
4. Jump the SCS line with the HDS.
5. Disconnect the MAF sensor/IAT sensor 5P connector.
6. Disconnect PCM connector A (49P).
7. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and PCM connector terminal A9. Is there continuity? YES - Go to step 8. NO - Repair open in the wire between the PCM (A9) and the MAF sensor, then go to step 15 .
8. Reconnect PCM connector A (49P).
9. Connect MAF sensor/IAT sensor 5P connector terminals No. 3 and No. 4 with a jumper wire.
10. Turn the ignition switch ON (II).
11. Clear the DTC with the HDS.
12. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES - Go to step 20 . NO - Go to step 13.
13. Turn the ignition switch OFF.
14. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
19. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 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.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0103 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0107: MAP Sensor Circuit Low Voltage

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

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1. Turn the ignition switch ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less 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 MAP sensor and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the MAP sensor 3P connector.
5. Turn the ignition switch ON (II).
6. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 in.Hg, 26 mmHg), or 0.23 V or less indicated? YES - Go to step 12 . NO - Go to step 7.
7. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 16 . NO - Go to step 8.
8. Turn the ignition switch OFF.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (49P).
11. Check for continuity between PCM connector terminal B36 and MAP sensor 3P connector terminal No. 1. Is there continuity? YES - Go to step 23 . NO - Repair open in the wire between the PCM (B36) and the MAP sensor, then go to step 18 .
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (49P).
15. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B35) and the MAP sensor, then go to step 18 . NO - Go to step 23 .
16. Turn the ignition switch OFF.
17. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0107 indicated? YES - Check for poor connections or loose terminals at the MAP sensor 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.
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0107 indicated? YES - Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0108: MAP 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 ).

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1. Turn the ignition switch ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 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 MAP sensor and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the MAP sensor 3P connector.
5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 in.Hg, 1,197 mmHg), or 4.49 V or more indicated? YES - Go to step 8. NO - Go to step 18 .
8. Remove the jumper wire from the MAP sensor 3P connector.
9. Measure voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES - Go to step 14 . NO - Go to step 10.
10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector B (49P).
13. Check for continuity between PCM connector terminal B34 and MAP sensor 3P connector terminal No. 3. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the PCM (B34) and the MAP sensor, then go to step 20 .
14. Turn the ignition switch OFF.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (49P).
17. Check for continuity between PCM connector terminal B35 and MAP sensor 3P connector terminal No. 2. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the PCM (B35) and the MAP sensor, then go to step 20 .
18. Turn the ignition switch OFF.
19. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0108 indicated? YES - Check for poor connections or loose terminals at the MAP sensor 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.
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0108 indicated? YES - Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0111: IAT Sensor 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 ).

1. Check for poor connections or loose terminals at ECT sensor 1/2 and the MAF sensor/IAT sensor. Are the connections and terminals OK? YES - Go to step 2. NO - Repair the connections or terminals, then go to step 15 .
2. Remove the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
3. Allow the IAT sensor to cool to ambient temperature.
4. Note the ambient temperature.
5. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install the sensor onto the air cleaner.
6. Turn the ignition switch ON (II).
7. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
8. Compare the value of the IAT SENSOR to the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more? YES - Go to step 13 . NO - Go to step 9.
9. Disconnect the MAF sensor/IAT sensor from the 5P connector.
10. Using a heat gun, blow hot air on the MAF sensor/ IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
11. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install the sensor onto the air cleaner.
12. Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 58°F (32°C) or more? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the IAT sensor and the PCM. NO - Go to step 13.
13. Turn the ignition switch OFF.
14. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0111 indicated? YES - Check for poor connections or loose terminals at the IAT sensor 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.

DTC P0112: IAT Sensor Circuit Low 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 17

1. Turn the ignition switch ON (II).
2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less 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 MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the MAF sensor/IAT sensor 5P connector.
5. Turn the ignition switch ON (II).
6. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector C (49P).
10. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there continuity? YES - Repair short in the wire between the IAT sensor and the PCM (C24), then go to step 13 . NO - Go to step 18 .
11. Turn the ignition switch OFF.
12. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0112 indicated? YES - Check for poor connections or loose terminals at the IAT sensor 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.
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0112 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0113: IAT 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 ).

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Scheme 21

1. Turn the ignition switch ON (II).
2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 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 MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the MAF sensor/IAT sensor 5P connector.
5. Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C)or less, or 4.92 V or more indicated? YES - Go to step 8. NO - Go to step 20 .
8. Turn the ignition switch OFF.
9. Remove the jumper wire from the MAF sensor/IAT sensor 5P connector.
10. Turn the ignition switch ON (II).
11. Measure voltage between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 12. NO - Go to step 16 .
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (49P).
15. Check for continuity between PCM connector terminal C16 and MAF sensor/IAT sensor 5P connector terminal No. 1. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C16) and the MAF sensor/IAT sensor, then go to step 22 .
16. Turn the ignition switch OFF.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector C (49P).
19. Check for continuity between PCM connector terminal C24 and MAF sensor/IAT sensor 5P connector terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C24) and the MAF sensor/IAT sensor, then go to step 22 .
20. Turn the ignition switch OFF.
21. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0113 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor 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.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0113 indicated? YES - Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0116: ECT Sensor 1 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 ).

1. Turn the ignition switch ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 176°F (80°C) or more, or 0.78 V or less indicated? YES - Go to step 6 . NO - Go to step 3.
3. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
4. 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.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO - Go to step 11 .
6. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
7. Turn the ignition switch OFF.
8. Open the hood, and let the engine cool for 3 hours.
9. Turn the ignition switch ON (II).
10. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
13. Turn the ignition switch ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0116 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to .

DTC P0117: ECT Sensor 1 Circuit Low 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 22

1. Turn the ignition switch ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor 1 2P connector.
5. Turn the ignition switch ON (II).
6. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector C (49P).
10. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between ECT sensor 1 and the PCM (C32), then go to step 13 . NO - Go to step 18 .
11. Turn the ignition switch OFF.
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0117 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1 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.
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0117 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0118: ECT Sensor 1 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 23

Scheme 24

Scheme 25

Scheme 26

1. Turn the ignition switch ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 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 ECT sensor 1 and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor 1 2P connector.
5. Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES - Go to step 8. NO - Go to step 20 .
8. Turn the ignition switch OFF.
9. Remove the jumper wire.
10. Turn the ignition switch ON (II).
11. Measure voltage between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12. NO - Go to step 16 .
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (49P).
15. Check for continuity between PCM connector terminal C16 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C16) and ECT sensor 1, then go to step 22 .
16. Turn the ignition switch OFF.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector C (49P).
19. Check for continuity between PCM connector terminal C32 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C32)and ECT sensor 1, then go to step 22 .
20. Turn the ignition switch OFF.
21. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0118 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1 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.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0118 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

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

1. Start the engine, and let it idle for 5 minutes or more.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 10°F (-12°C) or less, or 4.45 V or more indicated? YES - Go to step 9 . NO - Go to step 3.
3. Allow the engine to cool to 104°F (40°C) or less.
4. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
5. Start the engine, and let it idle.
6. Let the engine idle until ECT SENSOR 1 goes up 49°F (27°C) or more from the recorded temperature.
7. Note the value of ECT SENSOR 2 in the DATA LIST with the HDS.
8. Compare ECT SENSOR 2 and the recorded temperature. Did ECT SENSOR 2 change 17°F (9.5°C) or more? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. NO - Check the thermostat (see «FAN MOTOR TEST»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ). If the thermostat is OK, go to step 9. If the thermostat is faulty, replace it (see «THERMOSTAT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ), then go to step 11 .
9. Turn the ignition switch OFF.
10. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
11. Turn the ignition switch ON (II).
12. Reset the PCM with the HDS.
13. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
14. Allow the engine to cool to ambient temperature.
15. Start the engine, and let it idle for 20 minutes.
16. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0125 indicated? YES - Check for poor connections or loose terminals at the ECT sensor 2 and the PCM, then go to step 1 . NO - Go to step 17.
17. Monitor the OBD STATUS for DTC P0125 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 16 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor 2 and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 14 .

DTC P0128: Cooling System Malfunction

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. Turn the blower switch OFF.
4. Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES - Go to step 5. NO - Wait until the FAN CTRL is off, then go to step 5.
5. Check the radiator fan operation. Does the radiator fan keep running? YES - Check the radiator fan circuit (see «CIRCUIT DIAGRAM»(/acura/mdx/ii-2006-2010/remont/cooling-fan/#cooling-fan-controls) ), and the radiator fan relay (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). If the circuits and the relay are OK, go to step 19 . NO - Go to step 6.
6. Let the engine cool until the coolant temperature is 104°F (40°C) or less.
7. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
8. Start the engine, and let it idle.
9. Let the engine idle until ECT SENSOR 1 goes up 49°F (27°C) or more from the recorded temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the HDS.
11. Compare the value of recorded ECT SENSOR 2 and the present value of ECT SENSOR 2. Did the temperature rise 17°F (9.5°C) or more? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. NO - Test the thermostat (see «FAN MOTOR TEST»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ), then go to step 12.
12. Turn the ignition switch ON (II).
13. Reset the PCM with the HDS.
14. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
16. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0128 indicated? YES - Check the cooling system, then go to step 1 . NO - Go to step 18.
18. Monitor the OBD STATUS for DTC P0128 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 17 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check the cooling system, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 14 .
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
21. 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.
22. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0128 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P0128 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 20 .

DTC P0133: Rear A/F Sensor (Bank 1, Sensor 1) Response Malfunction/Slow Response; DTC P0153: Front A/F Sensor (Bank 2, Sensor 1) Response Malfunction/Slow Response

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0139 and/or P0159* is stored at the same time as DTC P0133 and/or P0153*, troubleshoot DTC P0139 and/or P0159* first, then recheck for DTC P0133 and/ or P0153*. Information marked with an asterisk (*) applies to the front bank (Bank 2).

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 1) above 158°F (70°C) Transmission in D position Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h)
5. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch OFF.
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h)
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0133 and/or P0153* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 14.
14. Monitor the OBD STATUS for DTC P0133 and/or P0153* 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 A/F sensor (Sensor 1) 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 .

DTC P0134: Rear A/F Sensor (Bank 1, Sensor 1) Heater System Malfunction; DTC P0154: Front A/F Sensor (Bank 2, Sensor 1) Heater System Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 27

Scheme 28

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle 1 minute.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/ relay box (PGM-FI subrelay) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 4 and PCM connector terminal B13 (B14)*. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect PCM connector B (49P).
11. Start the engine, then let it idle for 1 minute.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* Indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P0134 and/or P0154* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Start the engine, then let it idle 1 minute.
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 23 . If the PCM was substituted, go to step 1 . NO - Go to step 25.
25. Monitor the OBD STATUS for DTC P0134 and/or P0154* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 24 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 23 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0135: Rear A/F Sensor (Bank 1, Sensor 1) Heater Circuit Malfunction; DTC P0155: Front A/F Sensor (Bank 2, Sensor 1) Heater Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/ relay box (PGM-FI subrelay), and the PCM.
5. Turn the ignition switch OFF.
6. Check these fuses: No. 11 A/F sensor (AFHT+) (15 A) fuse in the under-hood fuse/relay box No. 3 R/B 1 (30 A) fuse in the main under-hood fuse box. No. 7 +B FAN TIMER (7.5 A) fuse in the under-hood fuse/relay box Are any of the above fuses blown? YES - Repair short in the wire between the A/F sensors, the under-hood fuse/relay box (PGM-FI subrelay), then replace the blown fuse(s), and go to step 23 . NO - Go to step 7.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. At the sensor side, measure resistance between A/F sensor (Sensor T) 6P connector terminals No. 1 and No. 2. Is there 2.5-3.2 ohms at room temperature? YES - Go to step 9. NO - Go to step 21 .
9. At the sensor side, check for continuity between each terminal at the A/F sensor (Sensor 1) 6P connector and body ground. Is there continuity? YES - Go to step 21 . NO - Go to step 10.
10. At the sensor side, check for continuity between A/F sensor (Sensor 1) 6P connector terminals No. 1 and No. 4, No. 1 and No. 5, No. 1 and No. 6 individually. Is there continuity? YES - Go to step 21 . NO - Go to step 11.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector C (49P).
13. Check for continuity between PCM connector terminal C6 (C8)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C6 (C8)*) and the A/F sensor (Sensor 1), then go to step 22 . NO - Go to step 14.
14. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 2 and PCM connector terminal C6 (C8)*. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the PCM (C6 (C8)*) and the A/F sensor (Sensor 1), then go to step 22 .
15. Disconnect the under-hood fuse/relay box 9P connector.
16. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 1 and under-hood fuse/ relay box 9P connector No. 9. Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the A/F sensor (Sensor 1) and the under-hood fuse/relay box, then go to step 22 .
17. Disconnect PCM connector A (49P).
18. Disconnect the under-hood fuse/relay box 14P connector.
19. Check for continuity between under-hood fuse/ relay box 14P connector terminal No. 13 and PCM connector terminal A40. Is there continuity? YES - Go to step 20. NO - Repair open in the wire between the PCM (A40) and the under-hood fuse/relay box, then go to step 22 .
20. Test the PGM-FI subrelay in the under-hood fuse/ relay box (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is the PGM-FI subrelay OK? YES - Go to step 28 . NO - Replace the relay control module (under-hood fuse/relay box) (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-hood-fuserelay-box) ), then go to step 22 .
21. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
22. Reconnect all connectors.
23. Turn the ignition switch ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay) and the PCM, then go to step 1 . NO - Go to step 27.
27. Monitor the OBD STATUS for DTC P0135 and/or P0155* 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 26 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
28. Reconnect all connectors.
29. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
30. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 31.
31. Monitor the OBD STATUS for DTC P0135 and/or P0155* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 30 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the under-hood fuse/relay box (PGM-FI subrelay) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0137: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Low Voltage; DTC P0157: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 36

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.05 V or less? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Turn the ignition switch ON (II).
8. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.05 V or less? YES - Go to step 9. NO - Go to step 13 .
9. Turn the ignition switch OFF.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (49P).
12. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B25 (B16)*) and the secondary HO2S (Sensor 2), then go to step 15 . NO - Go to step 23 .
13. Turn the ignition switch OFF.
14. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
19. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
20. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Engine speed at 1,500-3,000 rpm Drive 1 minute or more
21. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO - Go to step 22.
22. Monitor the OBD STATUS for DTC P0137 and/or P0157* 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 21 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) 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 19 .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Engine speed at 1,500-3,000 rpm Drive 1 minute or more
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . NO - Go to step 28.
28. Monitor the OBD STATUS for DTC P0137 and/or P0157* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 27 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, 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 25 .

DTC P0138: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage; DTC P0158: Front Secondary HO2S (Bank 2, Sensor 2) 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 ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 37

Scheme 38

Scheme 39

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch ON (II).
9. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES - Go to step 10. NO - Go to step 19 .
10. Turn the ignition switch OFF.
11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
12. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
13. Turn the ignition switch ON (II).
14. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES - Go to step 15. NO - Repair open in the wire between the PCM (C16) and the secondary HO2S (Sensor 2), then go to step 21 .
15. Turn the ignition switch OFF.
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector B (49P).
18. Check for continuity between PCM connector terminal B25 (B16)* and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the PCM (B25 (B16) *) and the secondary HO2S (Sensor 2), then go to step 21 .
19. Turn the ignition switch OFF.
20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
25. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Engine speed at 1,500-3,000 rpm Drive 1 minute or more
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO - Go to step 28.
28. Monitor the OBD STATUS for DTC P0138 and/or P0158* 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 27 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) 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 25 .
29. Reconnect all connectors.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
31. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
32. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Engine speed at 1,500-3,000 rpm Drive 1 minute or more
33. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 32 . If the PCM was substituted, go to step 1 . NO - Go to step 34.
34. Monitor the OBD STATUS for DTC P0138 and/or P0158* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). 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 secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, 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 .

DTC P0139: Rear Secondary HO2S (Bank 1, Sensor 2) Slow Response; DTC P0159: Front Secondary HO2S (Bank 2, Sensor 2) Slow Response

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
5. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch OFF.
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine, then let it idle without load (in Park or neutral) until the radiator fan comes on.
12. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) Transmission in D position Vehicle speed between 35-55 mph (56-88 km/h) Drive 5 minutes or more
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0139 and/or P0159* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO - Go to step 14.
14. Monitor the OBD STATUS for DTC P0139 and/or P0159* 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 secondary HO2S (Sensor 2) 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 11 .

DTC P0141: Rear Secondary HO2S (Bank 1, Sensor 2) Heater Circuit Malfunction; DTC P0161: Front Secondary HO2S (Bank 2, Sensor 2) Heater Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 40

Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the under-hood fuse/relay box (PGM-FI subrelay) and the PCM.
5. Turn the ignition switch OFF.
6. Check these fuses: No. 11 A/F sensor (AFHT+) (15 A) fuse in the under-hood fuse/relay box No. 3 R/B 1 (30 A) fuse in the main under-hood fuse box. No. 7 +B FAN TIMER (7.5 A) fuse in the under-hood fuse/relay box Are any of the fuses blown? YES - Repair short in the wire between the A/F sensors, the under-hood fuse/relay box (PGM-FI subrelay) and the fuse, then go to step 21 . NO - Go to step 7.
7. Disconnect the secondary HO2S (Sensor 2) 4P connector.
8. At the secondary HO2S (Sensor 2) side, measure resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-6.6 ohms at room temperature? YES - Go to step 9. NO - Go to step 20 .
9. At the secondary HO2S (sensor 2) side, check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. Is there continuity? YES - Go to step 20 . NO - Go to step 10.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector C (49P).
12. Check for continuity between PCM connector terminal C5 (C7)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C5 (C7)*) and the secondary HO2S (Sensor 2), then go to step 21 . NO - Go to step 13.
13. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 3 and PCM connector terminal C5 (C7)* Is there continuity? YES - Go to step 14. NO - Repair open in the wire between the PCM (C5 (C7)*) and the secondary HO2S (Sensor 2), then go to step 21 .
14. Disconnect the under-hood fuse/relay box 9P connector.
15. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 4 and under-hood fuse/relay box 9P connector No. 9. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the secondary HO2S (Sensor 2) and the under-hood fuse/relay box, then go to step 21 .
16. Disconnect PCM connector A (49P).
17. Disconnect the under-hood fuse/relay box 14P connector.
18. Check for continuity between under-hood fuse/ relay box 14P connector terminal No. 13 and PCM connector terminal A40. Is there continuity? YES - Go to step 19. NO - Repair open in the wire between the PCM (A40) and the under-hood fuse/relay box, then go to step 21 .
19. Test the PGM-FI subrelay in the under-hood fuse/ relay box (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is the PGM-FI subrelay OK? YES - Go to step 27 . NO - Replace the relay control module (under-hood fuse/relay box) (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-hood-fuserelay-box) ), then go to step 21 .
20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
21. Reconnect all connectors.
22. Turn the ignition switch ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM, then go to step 1 . NO - Go to step 26.
26. Monitor the OBD STATUS for DTC P0141 and/or P0161* 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 25 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 30.
30. Monitor the OBD STATUS for DTC P0141 and/or P0161* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 29 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2), the under-hood fuse/relay box (PGM-FI subrelay), and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0171: Rear Bank (Bank 1) Fuel System Too Lean; DTC P0172: Rear Bank (Bank 1) Fuel System Too Rich; DTC P0174: Front Bank (Bank 2) Fuel System Too Lean; DTC P0175: Front Bank (Bank 2) Fuel System Too Rich

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 P0171, P0172, P0174, and/or P0175, troubleshoot those DTCs first, then recheck for P0171, P0172, P0174, and/or P0175. P0101, P0102, P0103: Mass air flow (MAF) sensor P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0133, P0153, P1172, P1174, P2195, P2197, P2237, P2238, P2240, P2241, P2243, P2245, P2247, P2249, P2251, P2252, P2254, P2255, P2A00, P2A03: Air fuel ratio (A/F) sensor (Sensor 1) P0134, P0135, P0154, P0155: Air fuel ratio (A/F) sensor (Sensor 1) heater P0137, P0138, P0139, P0157, P0158, P0159, P2270, P2271, P2272, P2273: Secondary HO2S (Sensor 2) P0141, P0161: Secondary HO2S (Sensor 2) heater P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system P2279: Intake air leakage

1. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Go to step 2. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system) ),then go to step 7 . If the pressure is too low, check the fuel pump, the fuel feed pipe and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system) ), then go to step 7 .
2. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Air intake duct Are the parts OK? YES - Go to step 3. NO - Repair or replace parts with leaks, then go to step 7 .
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. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in Park or neutral All electrical loads off
5. Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES - Repeat step 5. NO - Go to step 6.
6. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.8- 11.9 gm/s? YES - Check the engine valve clearances and adjust if necessary (see «VALVE CLEARANCE ADJUSTMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__valve-clearance-adjustment) ). If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 7. NO - Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 7.
7. Turn the ignition switch ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
10. 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.
11. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Drive at a steady speed between 15-75 mph (24-120 km/h) for 15 minutes. NOTE: DTC P0171, P0172, P0174, and/or P0175 may take up to 80 minutes of test driving to set. Using the HDS, monitor the long term fuel trim (LT FUEL TRIM) or the air fuel feed back average (AF FB AVE). If the long term fuel trim/air fuel feed back average stays within 0.84-1.18, there is no problem at this time.
12. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0171, P0172, P0174, or P0175 indicated? YES - Go to step 1 and recheck. NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0300: Random Misfire and Any Combination of the Following: DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected; DTC P0305: No. 5 Cylinder Misfire Detected; DTC P0306: No. 6 Cylinder Misfire Detected

Special Tools Required

1. Pressure gauge adapter 07NAJ-P07010A
2. A/T low pressure gauge w/panel 07406-0070301
3. A/T pressure hose 07406-0020201
4. A/T pressure hose, 2,210 mm 07MAJ-PY4011A
5. A/T pressure adapter 07MAJ-PY40120
6. Oil pressure hose 07ZAJ-S5AA200

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the misfire is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0306) will be stored. If the misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfire stops, the MIL will remain on. Troubleshoot the following DTCs first, if any of them were stored along with the random misfire DTC(s) (Because parts can sometimes fail without setting DTC's you should also do a physical inspection of the below systems.): P0101, P0102, P0103: Mass air flow (MAF) P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor P0171, P0172, P0174, P0175: Fuel system P0335, P0339, P0385, P0389: Crankshaft position (CKP) sensor A/B P0506, P0507: Idle control system P0340, P0344: Camshaft position (CMP) sensor P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: Exhaust gas recirculation (EGR) system

Scheme 46

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (in Park or neutral).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, let it idle until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9 . NO - Go to step 6.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time.
9. Turn the ignition switch OFF.
10. Check the fuel quality. Is the quality good? YES - Go to step 11. NO - Drain the tank, and fill it with a known-good fuel, then go to step 24 .
11. Inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/mdx/ii-2006-2010/remont/ignition-system/#ignition-system) ). If the spark plugs are fouled or worn, replace them.
12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 14. NO - Go to step 24 .
14. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - Go to step 15. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system) ), then go to step 24 . If the pressure is too low, check the fuel pump, the fuel feed lines, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system) ), then go to step 24 .
15. 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.
16. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in Park or neutral All electrical loads off
17. Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES - Repeat step 17. NO - Go to step 18.
18. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.8-11.9 gm/s? YES - Go to step 19. NO - Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 24 .
19. Turn the ignition switch OFF.
20. Remove the rocker arm oil pressure switch (A), and install the special tools as shown, then install the rocker arm oil pressure switch in the pressure gauge adapter (B). NOTE: Install the parts in the reverse order of removal with a new O-ring.
21. Reconnect the rocker arm oil pressure switch 2P connector.
22. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on.
23. Check the oil pressure at engine speeds of 1,000 and 2,000 rpm. Keep the measuring time as short as possible (less than 1 minute) because the engine is running without load. Is the oil pressure below 49 kPa (0.5 kgf/cm 2 , 7 psi)? YES - Remove the oil pressure gauge, and reinstall the rocker arm oil pressure switch, then go to step 24. NO - Inspect the VTEC system (see «VTEC ROCKER ARM TEST»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ), then go to step 24.
24. Turn the ignition switch ON (II).
25. Reset the PCM with the HDS.
26. Clear the CKP pattern with the HDS.
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
28. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
29. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
30. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0300 and any combination of DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES - Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to «DTC P0301, P0302, P0303, P0304, P0305, or P0306»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-no-1-cylinder-misfire) troubleshooting. NO - Go to step 27 .
31. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 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 30 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connection or loose terminals at the ignitions coil, the injector, 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 29 .

DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected; DTC P0305: No. 5 Cylinder Misfire Detected; DTC P0306: No. 6 Cylinder Misfire Detected

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

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load for 2 minutes (in Park or neutral).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9 . NO - Go to step 6.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 9 . NO - If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 .
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. Check the fuel and ignition system circuit connectors for loose wires or poor connections.
9. Turn the ignition switch OFF.
10. Exchange the ignition coil from the problem cylinder with one from another cylinder.
11. Reconnect all connectors.
12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 14. NO - Intermittent failure due to poor contact at the ignition coil contactor (no misfire at this time). Make sure that the ignition coil connectors are secure.
14. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was moved? YES - Replace the faulty ignition coil (see «IGNITION COIL REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/ignition-system/#ignition-system) ), then go to step 53 . NO - Go to step 15.
15. Turn the ignition switch OFF.
16. Exchange the spark plug from the problem cylinder with the one from another cylinder.
17. Reconnect all connectors.
18. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
19. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 20. NO - Intermittent failure due to spark plug fouling (no misfire at this time).
20. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was moved? YES - Replace the faulty spark plug, then go to step 53 . NO - Go to step 21.
21. Turn the ignition switch OFF.
22. Disconnect the ignition coil 3P connector from the problem cylinder.
23. Turn the ignition switch ON (II).
24. Measure voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 25. NO - Repair open in the wire between the ignition coil and the under-hood fuse/relay box, then go to step 53 .
25. Turn the ignition switch OFF.
26. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 27. NO - Repair open in the wire between the ignition coil, G101, then go to step 53 .
27. Jump the SCS line with the HDS.
28. Disconnect PCM connector B (49P).
29. Check for continuity between body ground and the appropriate PCM connector terminal (see table). PCM TERMINAL AND WIRE COLOR REFERENCE PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B29 YEL/GRN No. 2 P0302 B30 BLU/RED No. 3 P0303 B22 WHT/BLU No. 4 P0304 B23 BRN No. 5 P0305 B11 BLK/RED No. 6 P0306 B12 BRN/WHT Is there continuity? YES - Repair short in the wire between the PCM and the ignition coil, then go to step 53 . NO - Go to step 30.
30. Check for continuity between appropriate ignition coil 3P connector terminal No. 1 and the appropriate PCM connector terminal of the problem cylinder (see table). PCM TERMINAL AND WIRE COLOR REFERENCE PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B29 YEL/GRN No. 2 P0302 B30 BLU/RED No. 3 P0303 B22 WHT/BLU No. 4 P0304 B23 BRN No. 5 P0305 B11 BLK/RED No. 6 P0306 B12 BRN/WHT Is there continuity? YES - Go to step 31. NO - Repair open in the wire between the PCM and the ignition coil, then go to step 53 .
31. Remove the intake manifold (see «REMOVAL»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
32. Turn the ignition switch ON (II).
33. Measure voltage between body ground and the appropriate PCM connector terminal (see table). PCM TERMINAL AND WIRE COLOR REFERENCE PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B4 BRN No. 2 P0302 B8 RED No. 3 P0303 B7 BLU No. 4 P0304 B6 YEL No. 5 P0305 B5 BLK/RED No. 6 P0306 B9 WHT/BLU Is there battery voltage? YES - Go to step 41 . NO - Go to step 34.
34. Turn the ignition switch OFF.
35. Disconnect the injector 2P connector from the problem cylinder.
36. Turn the ignition switch ON (II).
37. Measure voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 38. NO - Repair open in the wire between the injector and under-hood fuse/relay box (PGM-FI main relay 1), then go to step 51 .
38. Turn the ignition switch OFF.
39. Check for continuity between body ground and the appropriate PCM connector terminal (see table). PCM TERMINAL AND WIRE COLOR REFERENCE PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B4 BRN No. 2 P0302 B8 RED No. 3 P0303 B7 BLU No. 4 P0304 B6 YEL No. 5 P0305 B5 BLK/RED No. 6 P0306 B9 WHT/BLU Is there continuity? YES - Repair short in the wire between the PCM and the injector, then go to step 53 . NO - Go to step 40.
40. Check for continuity between appropriate injector 2P connector terminal No. 2 and the appropriate PCM connector terminal of the problem cylinder (see table). PCM TERMINAL AND WIRE COLOR REFERENCE PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B4 BRN No. 2 P0302 B8 RED No. 3 P0303 B7 BLU No. 4 P0304 B6 YEL No. 5 P0305 B5 BLK/RED No. 6 P0306 B9 WHT/BLU Is there continuity? YES - Check for poor connections or loose terminals at the injector and under-hood fuse/relay box (PGM-FI main relay 1),then go to step 41. NO - Repair open in the wire between the PCM and the injector, then go to step 53 .
41. Measure resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES - Go to step 42. NO - Replace the injector (see «INJECTOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 53 .
42. Exchange the injector from the problem cylinder with the one from another cylinder. Also check the injector fuel inlet screen for debris, and clean if needed.
43. Reconnect all connectors, and install the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
44. Turn the ignition switch ON (II).
45. Clear the DTCs with the HDS.
46. Start the engine, and let it idle without load (in Park or neutral) for 2 minutes.
47. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
48. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES - Go to step 49. NO - Intermittent failure due to poor contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
49. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was moved? YES - Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 53 . NO - Go to step 50.
50. Turn the ignition switch OFF.
51. Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__engine-compression-inspection) ). Did the engine pass both tests? YES - Go to step 52. NO - Repair the engine, then go to step 53 .
52. Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Did the engine pass the test? YES - Go to step 61 . NO - Repair the VTEC rocker arm, then go to step 53.
53. Reconnect all connectors.
54. Reset the PCM with the HDS.
55. Clear the CKP pattern with the HDS.
56. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
57. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
58. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
59. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES - Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to «P0301, P0302, P0303, P0304, or P0305»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dtc-p0300-random-misfire-and-any) . NO - Go to step 60.
60. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 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 59 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, 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 58 .
61. Reconnect all connectors.
62. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) )
63. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) APP SENSOR
64. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES - Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 63 . If the PCM was substituted, go to step 1 . NO - Go to step 65.
65. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ), If any other Temporary DTCs or DTCs were indicated in step 64 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 63 . If the PCM was substituted, 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 63 .

DTC P0325: Knock Sensor Circuit Malfunction

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

Scheme 58

Scheme 59

Scheme 60

Scheme 61

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. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES - Go to step 6. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM.
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect the knock sensor subharness 1P connector.
9. Disconnect PCM connector C (49P).
10. Check for continuity between PCM connector terminal C47 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C47) and the knock sensor subharness, then go to step 19 . NO - Go to step 11.
11. Connect the knock sensor subharness 1P connector terminal to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal C47 and body ground. Is Mere continuity? YES - Go to step 13. NO - Repair open in the wire between the PCM (C47) and the knock sensor subharness, then go to step 19 .
13. Remove the intake manifold (see «REMOVAL»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ), and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
14. Disconnect the knock sensor 1P connector.
15. Check for continuity between the knock sensor subharness 1P connector terminal and body ground. Is there continuity? YES - Repair short in the knock sensor subharness, then go to step 18 . NO - Go to step 16.
16. Check for an open in the knock sensor subharness. Is the harness OK? YES - Go to step 17. NO - Repair open in the knock sensor subharness, then go to step 19 .
17. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
18. Install the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ), and the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
19. Reconnect all connectors.
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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
23. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES - Go to step 26 . NO - Go to step 25.
25. Monitor the OBD STATUS for DTC P0325 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 24 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 23 .
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. 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.
28. Hold the engine speed at 3,000-4,000 rpm for at least 10 seconds.
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0325 indicated? YES - Check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 28 . If the PCM was substituted, go to step 1 . NO - Go to step 30.
30. Monitor the OBD STATUS for DTC P0325 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 29 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 28 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 28 .

DTC P0335: CKP Sensor A No Signal; DTC P0385: CKP Sensor B No Signal

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to CKP sensor B.

Scheme 62

Scheme 63

Scheme 64

Scheme 65

Scheme 66

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect CKP sensor A/B 6P connector (see «CKP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
7. Turn the ignition switch ON (II).
8. Measure voltage between CKP sensor A/B 6P connector terminal No. 6 (No. 3)* and body ground. Is there battery voltage? YES - Go to step 9. NO - Repair open in the wire between CKP sensor A/B and the under-hood fuse/relay box (PGM-FI main relay 1), then go to step 18 .
9. Measure voltage between CKP sensor A/B 6P connector terminal No. 5 (No. 2)* and body ground. Is there about 5 V? YES - Go to step 10. NO - Go to step 11 .
10. Measure voltage between CKP sensor A/B 6P connector terminals No. 4 (No. 1)* and No. 6 (No. 3)*. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between CKP sensor A/B and G101, then go to step 18 .
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector B (49P).
14. Check for continuity between PCM connector terminal B45 (B44)* and CKP sensor A/B 6P connector No. 5 (No. 2)*. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the PCM (B45 (B44)*) and CKP sensor A/B, then go to step 18 .
15. Check for continuity between PCM connector terminal B45 (B44)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B45 (B44) *) and CKP sensor A/B, then go to step 18 . NO - Go to step 25 .
16. Turn the ignition switch OFF.
17. Replace CKP sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Clear the CKP pattern with the HDS.
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES - Check for poor connections or loose terminals at CKP sensor A/B and the PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0335 and/or P0385* indicated? YES - Check for poor connections or loose terminals at CKP sensor A/B and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0339: CKP Sensor A Intermittent Interruption; DTC P0389: CKP Sensor B Intermittent Interruption

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to CKP sensor B.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0339 and/or P0389 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CKP sensor A/B and the PCM.
5. Check for poor or loose connections at these connectors and terminals: CKP sensor A/B PCM Engine ground Body ground Are the connections OK? YES - Go to step 6. NO - Reconnect the connectors or terminals, then go to step 9 .
6. Check for damage to the CKP sensor A/B pulse plate on the timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ). Is there damage? YES - Replace the CKP sensor A/B pulse plate/ timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ), then go to step 9 . NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Replace CKP sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
9. Turn the ignition switch ON (II).
10. Reset the PCM with the HDS.
11. Clear the CKP pattern with the HDS.
12. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
13. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
14. Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0339 and/or P0389* indicated? YES - Check for poor connections or loose terminals at CKP sensor A/B 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.

DTC P0340: CMP Sensor No Signal

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

Scheme 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the CMP sensor 3P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between CMP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES - Go to step 9. NO - Repair open in the wire between the CMP sensor and under-hood fuse/relay box (PGM-FI main relay 1), then go to step 18 .
9. Measure voltage between CMP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 10. NO - Go to step 11 .
10. Measure voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES - Go to step 16 . NO - Repair open in the wire between the CMP sensor and G101, then go to step 18 .
11. Turn the ignition switch OFF.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector B (49P).
14. Check for continuity between PCM connector terminal B46 and CMP sensor 3P connector terminal No. 1. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the PCM (B46) and the CMP sensor, then go to step 18 .
15. Check for continuity between CMP sensor 3P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B46) and the CMP sensor, then go to step 18 . NO - Go to step 26 .
16. Turn the ignition switch OFF.
17. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Clear the CKP pattern with the HDS.
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
23. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
24. Start the engine.
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES - Check for poor connections or loose terminals at the CMP sensor 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.
26. Reconnect all connectors.
27. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
28. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0340 indicated? YES - Check for poor connections or loose terminals at the CMP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0344: CMP Sensor Circuit Intermittent Interruption

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. Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0344 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
5. Check for poor or loose connections at these connectors and terminals: CMP sensor PCM Engine ground Body ground Are the connections OK? YES - Go to step 6. NO - Reconnect or repair the connectors or terminals, then go to step 9 .
6. Check for damage to the CMP sensor pulse projection on the front camshaft pulley (see «CMP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ). Is there damage? YES - Replace the front camshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ), then go to step 9 . NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
9. Turn the ignition switch ON (II).
10. Reset the PCM with the HDS.
11. Clear the CKP pattern with the HDS.
12. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
13. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
14. Test-drive the vehicle for 10 minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0344 indicated? YES - Check for poor connections or loose terminals at the CMP sensor 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.

DTC P050A: Cold Start Idle Air Control System 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 ).

1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs other than P050A indicated? YES - Go to the indicated DTCs troubleshooting. NO - Go to step 3.
3. Check for poor connections or blockage at the intake air duct. Is it OK? YES - Go to step 4. NO - Reconnect or repair the intake air duct, then go to step 19 .
4. Check for damage at the air cleaner housing. Is it OK? YES - Go to step 5. NO - Replace the air cleaner housing (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ), then go to step 19 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES - Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ), then go to step 19 . NO - Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 10. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, let the engine idle until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
10. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES - Go to step 11. NO - Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 19 .
11. 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.
12. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.6- 12.9 gm/s? YES - Go to step 13. NO - Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19 .
13. Turn the ignition switch OFF.
14. Allow the engine to cool to ambient temperature.
15. Note the ambient temperature.
16. Turn the ignition switch ON (II).
17. Note the value of IAT SENSOR quickly in the DATA LIST with the HDS.
18. Compare the value of the IAT SENSOR and the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more? YES - Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19 . NO - Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 19 . If there is damage in the throttle bore, replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 19 .
19. Turn the ignition switch ON (II).
20. Reset the PCM with the HDS.
21. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P050A indicated? YES - Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P050A 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 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . If the screen indicates EXECUTING, let the engine idle until a result comes on. if the screen indicates OUT OF CONDITION, go to step 22 .

DTC P050B: Cold Start Ignition Timing 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 ).

1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs other than P050B indicated? YES - Go to the indicated DTCs troubleshooting. NO - Go to step 3.
3. Check for poor connections or blockage at the intake air duct. Is it OK? YES - Go to step 4. NO - Reconnect or repair the intake air duct, then go to step 25 .
4. Check for damage at the air cleaner housing. Is it OK? YES - Go to step 5. NO - Replace the air cleaner housing (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ), then go to step 25 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES - Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ), then go to step 25 . NO - Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 10. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates EXECUTING, let the engine idle until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.
10. Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/mdx/ii-2006-2010/remont/ignition-system/#ignition-system) ). Is the ignition timing OK? YES - Go to step 12 . NO - Go to step 11.
11. Check for damage at CKP sensor A/B (see «CKP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ) and the timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ). Is CKP sensor A/B and/or the CKP sensor pulser plate damaged? YES - Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ) and/or the timing belt drive pulley (see «TIMING BELT DRIVE PULLEY REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ), then go to step 6 . NO - Go to step 30 .
12. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES - Go to step 13. NO - Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 25 .
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. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.6-12.9 gm/s? YES - Go to step 15. NO - Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 25 .
15. Turn the ignition switch OFF.
16. Drain the coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
17. Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
18. Allow the sensors to cool to ambient temperature.
19. Note the ambient temperature.
20. Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install them on the engine.
21. Turn the ignition switch ON (II).
22. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
23. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES - Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 24. NO - Check and repair any problems with the following items, then go to step 25 . Engine compression and cylinder leakdown VTEC system Engine oil A/C system Power steering
24. Refill the engine coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
25. Turn the ignition switch ON (II).
26. Reset the PCM with the HDS.
27. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
28. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P050B indicated? YES - Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO - Go to step 30.
30. Monitor the OBD STATUS for DTC P050B 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 28 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, 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 27 .
31. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
32. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
33. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
34. Check for Temporary DTCs or DTCs with the HDS. Is DTC P050B indicated? YES - Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 32 . If the PCM was substituted, go to step 1 . NO - Go to step 35.
35. Monitor the OBD STATUS for DTC P050B 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 34 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 32 . If the PCM was substituted, 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 32 .

DTC P0562: Charging System Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If any high current load accessories are installed, this DTC can be set. If DTC P16BB and/or P16BC is stored at the same time as DTC P0562, troubleshoot DTC P16BB and/or P16BC first, then recheck for DTC P0562.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0562 indicated? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ), then go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the main under-hood fuse box, and check the battery performance (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ).
7. Turn the ignition switch ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine.
11. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
12. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0562 indicated? YES - Check for poor connections or loose terminals at the alternator and the main under-hood fuse box, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0563: PCM Power Source Circuit Unexpected 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 72

Scheme 73

Scheme 74

Scheme 75

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Wait 10 seconds.
5. Turn the ignition switch ON (II).
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES - Go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals under-hood fuse/relay box (PGM-FI main relay 1) and the No. 8 IGP (15 A) fuse in the under-hood fuse/relay box and the PCM.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Measure voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES - Go to step 13 . NO - Go to step 11.
11. Disconnect the under-hood fuse/relay box 14P connector.
12. Check for continuity between PCM connector terminal A6 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A6) and under-hood fuse/relay box (PGM-FI main relay 1), then go to step 19 . NO - Go to step 18 .
13. Reconnect PCM connector A (49P).
14. Disconnect PCM connector B (49P).
15. Measure voltage between PCM connector terminal B3 and body ground. Is there battery voltage? YES - Go to step 16. NO - Go to step 18 .
16. Disconnect the under-hood fuse/relay box 9P connector.
17. Measure voltage between PCM connector terminal B3 and body ground. Is there battery voltage? YES - Repair short to power in the wire between the PCM (B3) and under-hood fuse/relay box (PGM-FI main relay 1), then go to step 19 . NO - Go to step 18.
18. Test PGM-FI main relay 1 in the under-hood fuse/ relay box (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES - Go to step 26 . NO - Replace relay control module (under-hood fuse/relay box) (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-hood-fuserelay-box) ), then go to step 19.
19. Reconnect all connectors.
20. Turn the ignition switch ON (II).
21. Reset the PCM with the HDS.
22. Turn the ignition switch OFF.
23. Wait 10 seconds.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
25. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES - Check for poor connections or loose terminals at under-hood fuse/relay box (PGM-FI main relay 1) 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.
26. Reconnect all connectors.
27. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
28. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0563 indicated? YES - Check for poor connections or loose terminals at under-hood fuse/relay box (PGM-FI main relay 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0602: PCM Programming Error

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). This DTC is indicated when a PCM update is not completed. Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF before completion, the PCM can be damaged.

1. Do the PCM update procedure (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
2. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0602 indicated? YES - Replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Update is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P060A: PCM (A/T system) Internal Control Module Malfunction

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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P060A indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Update the PCM if it does hot have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P060A indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0615: Starter Cut Relay STRLD Circuit Malfunction

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

Scheme 76

Scheme 77

Scheme 78

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
5. Turn the ignition switch OFF.
6. Check the STRLD (7.5 A) fuse in the auxiliary under-dash fuse holder 2. Is the fuse OK? YES - Go to step 7. NO - Replace the STRLD (7.5 A) fuse in the auxiliary under-dash fuse holder 2, then go to step 12 .
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector A (49P).
9. Remove starter cut relay 1 (A) from auxiliary under-dash relay box A.
10. Connect starter cut relay 1 4P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between PCM connector terminal A28 and body ground. Is there continuity? YES - Go to step 17 . NO - Repair open in the wire between the PCM (A28) and starter cut relay 1, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES - Check for poor connections or loose terminals at starter cut relay 1 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.
17. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0615 indicated? YES - Check for poor connections or loose terminals at starter cut relay 1 and the PCM, then go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P062F: PCM Internal Control Module Keep Alive Memory (KAM) Error

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. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P062F indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0630: VIN Not Programmed or Mismatch

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). This DTC is stored only when the PCM does not have the VIN information of the vehicle. Use the HDS to input the missing VIN information.

1. Turn the ignition switch ON (II).
2. Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES - Go to step 5 . NO - Go to step 3.
3. Input the VIN to the PCM with the HDS. Does the screen show COMPLETE? YES - Go to step 5 . NO - Go to step 4.
4. Check for DTCs with the HDS. Is DTC P062F indicated? YES - Do the troubleshooting for P062F (see «DTC P062F: PCM Internal Control Module Keep Alive Memory (KAM) Error»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dtc-p062f-pcm-internal-control-module) ). NO - Go to step 9 .
5. Clear the DTC with the HDS.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (II), and wait 5 seconds.
8. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0603 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time.
9. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
10. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0630 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P0685: PCM Power Control Circuit/ Internal Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the problem doesn't return after you clear the DTC, or it this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the PCM.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle for 30 seconds.
4. Turn the ignition switch OFF.
5. Start the engine, then let it idle for 30 seconds.
6. Turn the ignition switch OFF.
7. Turn the ignition switch ON (II).
8. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0685 indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time.
9. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
10. Start the engine, then let it idle for 30 seconds.
11. Turn the ignition switch OFF.
12. Start the engine, then let it idle for 30 seconds.
13. Turn the ignition switch OFF.
14. Turn the ignition switch ON (II).
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0685 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 10 . 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P1109: BARO Sensor Circuit Out of Range High

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

1. Reset the PCM with the HDS.
2. Start the engine.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1109 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1109 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P1116: ECT Sensor 1 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 ). If DTC P0111 is stored at the same time as DTC P1116, troubleshoot DTC P0111 first, then recheck for DTC P1116.

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES - Go to step 2. NO - Repair the connectors or terminals, then go to step 27 .
2. Turn the ignition switch ON (II).
3. Check for Temporary DTCs or DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES - Go to step 15 . NO - Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 129°F (54°C) or less, or 1.54 V or more indicated? YES - Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 28 . NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Drain the coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
8. Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
9. Allow ECT sensor 1 to cool to ambient temperature.
10. Note the ambient temperature.
11. Connect ECT sensor 1 to its 2P connector, but do not install it on the engine.
12. Turn the ignition switch ON (II).
13. Note the value of ECT SENSOR 1 quickly in the DATA LIST with the HDS.
14. Compare the value of ECT SENSOR 1 and the ambient temperature. Does the value of ECT SENSOR 1 differ 5.4°F (3°C) or more? YES - Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
15. Start the engine, and let it idle for 10 minutes.
16. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 118°F (48°C) or less, or 1.75 V or more indicated? YES - Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 17.
17. Let the engine idle for 10 minutes.
18. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES - Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 19.
19. Turn the ignition switch OFF.
20. Drain the coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
21. Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
22. Allow the sensors to cool to ambient temperature.
23. Note the ambient temperature.
24. Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install them on the engine.
25. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
26. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensors differ more than 5.4°F (3°C) from the ambient temperature? YES - Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 27. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then reconnect all connectors, and refill the cooling system (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
27. Refill the engine coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
31. Check for Temporary DTCs or DTCs with the HDS. Is DTC P0116 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, 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.

DTC P1128: MAP Sensor Signal Lower Than Expected

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

1. Inspect the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ). Is it OK? YES - Go to step 2. NO - Clean or replace the air cleaner element (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ).
2. Turn the ignition switch ON (II).
3. Check the MAP SENSOR in the DATA LIST with the HDS. Is there less than 54.1 kPa (16.0 in.Hg, 406 mmHg) or 1.61 V held for more than 5 seconds? YES - Go to step 8 . NO - Go to step 4.
4. Clear the DTC with the HDS.
5. 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.
6. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,200-5,500 rpm Transmission in D position Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle
7. Monitor the OBD STATUS for DTC P1128 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. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 5 and recheck.
8. Turn the ignition switch OFF.
9. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__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 under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,200-5,500 rpm Transmission in D position Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1128 indicated? YES - Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO - Go to step 16.
16. Monitor the OBD STATUS for DTC P1128 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 15 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 14 .

DTC P1129: MAP Sensor Signal Higher than Expected

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

1. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Are there any vacuum leaks? YES - Repair or replace the part(s) with vacuum leaks, then go to step 9 . NO - Go to step 2.
2. 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.
3. Check the MAP SENSOR in the DATA LIST with the HDS. Is there more than 36.9 kPa (11.0 in.Hg, 277 mmHg) or 1.14 V held for more than 5 seconds? YES - Go to step 7 . NO - Go to step 4.
4. Clear the DTC with the HDS.
5. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400-6,500 rpm Transmission in D position Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds. During the drive, decelerate (with the throttle fully closed) for 2 seconds.
6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 7. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 5 and recheck.
7. Turn the ignition switch OFF.
8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
12. 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.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed between 1,400-6,500 rpm Transmission in D position Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds. During the drive, decelerate (with the throttle fully closed) for 2 seconds.
14. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1129 indicated? YES - Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO - Go to step 15.
15. Monitor the OBD STATUS for DTC P1129 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 14 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 13 .

DTC P1172: Rear A/F Sensor (Bank 1, Sensor 1) Circuit Out of Range High; DTC P1174: Front A/F Sensor (Bank 2, Sensor 1) Circuit Out of Range High

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

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. Monitor the OBD STATUS for P1172 and/or P1174* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 5. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
5. Turn the ignition switch OFF.
6. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
7. Turn the ignition switch ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
10. 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.
11. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1172 and/or P1174* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 12.
12. Monitor the OBD STATUS for DTC P1172 and/or P1174* 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 11 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.

DTC P1297: ELD Circuit Low 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 79

1. Turn the ignition switch ON (II).
2. Check the ELD in the DATA LIST with the HDS. Is 72 A 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 ELD and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ELD 3P connector.
5. Turn the ignition switch ON (II).
6. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES - Go to step 7. NO - Go to step 11 .
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between PCM connector terminal A10 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A10) and the ELD, then go to step 13 . NO - Go to step 20 .
11. Turn the ignition switch OFF.
12. Replace the leftside engine compartment wire harness (see «LEFT ENGINE COMPARTMENT WIRE HARNESS»(/acura/mdx/ii-2006-2010/remont/body-electrical/#connectors-and-harnesses__left-engine-compartment-wire-harness) ).
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
17. Start the engine.
18. Turn on the headlights.
19. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1297 indicated? YES - Check for poor connections or loose terminals at the ELD unit 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.
20. Reconnect all connectors.
21. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
22. Start the engine.
23. Turn on the headlights.
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1297 indicated? YES - Check for poor connections or loose terminals at the ELD unit and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P1298: ELD 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 80

Scheme 81

Scheme 82

1. Turn the ignition switch ON (II).
2. Check the ELD in the DATA LIST with the HDS. Is 0.2 A or less 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 ELD and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ELD 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 7. NO - Repair open in the wire between the No. 18 IG ACG (10 A) fuse in the under-dash fuse/relay box and the ELD, then go to step 13 .
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between PCM connector terminal A10 and ELD 3P connector terminal No. 3. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the PCM (A10) and the ELD, then go to step 13 .
11. Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES - Go to step 12. NO - Repair open in the wire between the ELD and G302, then go to step 13 .
12. Replace the left side engine compartment wire harness (see «LEFT ENGINE COMPARTMENT WIRE HARNESS»(/acura/mdx/ii-2006-2010/remont/body-electrical/#connectors-and-harnesses__left-engine-compartment-wire-harness) ).
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1298 indicated? YES - Go to step 18. NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
18. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
19. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1298 indicated? YES - Check for poor connections or loose terminals at the ELD unit and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P1549: Charging System 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 ). If a high voltage battery (24 V, etc.) is connected to the vehicle, this DTC can be stored.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check under these conditions: A/C switch off Headlights off Rear window defogger off
5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1549 indicated? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ), then go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the main under-hood fuse box.
7. Turn the ignition switch ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine.
11. Check under these conditions: A/C switch off Headlights off Rear window defogger off
12. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1549 indicated? YES - Check for poor connections or loose terminals at the alternator and the main under-hood fuse box, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P16BB: Alternator B Terminal Circuit Low Voltage

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.
4. Check under these conditions: A/C switch on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BB indicated? YES - Go to step 7. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the main under-hood fuse box, and check the battery performance (see «BATTERY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#battery) ).
7. Check for poor connections or loose terminals at the alternator and the main under-hood fuse box (+B line). Are the connections and terminals OK? YES - Go to step 8. NO - Repair the connectors or terminals, then go to step 9 .
8. Check for an open in the wire between the alternator and main under-hood fuse box at the starter subharness. is the harness OK? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ), then go to step 9. NO - Repair open in the wire between the alternator and the main under-hood fuse box, then go to step 9.
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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
12. Start the engine.
13. Check under these conditions: A/C switch on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
14. Hold the engine speed at 2,000 rpm (in Park or neutral) for 1 minute.
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BB indicated? YES - Check for poor connections or loose terminals at the alternator and the main under-hood fuse box, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P16BC: Alternator FR Terminal Circuit/ IGP Circuit Low 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 83

Scheme 84

Scheme 85

1. Check for poor connections or loose terminals at the alternator 4P connector. Are the connections and terminals OK? YES - Go to step 2. NO - Repair the connector or terminals, then go to step 18 .
2. Check the alternator mounting surface for corrosion. Is the mounting surface corroded? YES - Remove the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ). Clean all mounting surfaces, reinstall the alternator, then go to step 18 . NO - Go to step 3.
3. Turn the ignition switch ON (II).
4. Clear the DTC with the HDS.
5. Start the engine.
6. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
7. Hold the engine speed 2,000 rpm (in Park or neutral) for 1 minute.
8. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES - Go to step 9. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator.
9. Turn the ignition switch OFF.
10. Disconnect the alternator 4P connector.
11. Turn the ignition switch ON (II).
12. Measure voltage between alternator 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 13. NO - Repair open in the wire between the alternator (IG1 line) and the No. 18 ACG (10 A) fuse in the under-dash fuse/relay box, then go to step 18 .
13. Measure voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V? YES - Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ), then go to step 18 . NO - Go to step 14.
14. Turn the ignition switch OFF.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (44P).
17. Check for continuity between alternator 4P connector terminal No. 4 and PCM connector terminal C44. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (C44) and the alternator, then go to step 18.
18. Turn the ignition switch OFF.
19. Reconnect all connectors.
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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
23. Start the engine.
24. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
25. Hold the engine speed 2,000 rpm (in Park or neutral) for 1 minute.
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES - Check for poor connections or loose terminals at the alternator 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.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Start the engine.
30. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
31. Hold the engine speed 2,000 rpm (in Park or neutral) for 1 minute.
32. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BC indicated? YES - Check for poor connections or loose terminals at the alternator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 29 . 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P16BD: Starter Cut Relay 2 Malfunction

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 and wait 5 seconds.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BD indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 2 and the PCM.
4. Turn the ignition switch OFF.
5. Replace starter relay 2.
6. Turn the ignition switch ON (II).
7. Reset the PCM with the HDS.
8. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
9. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BD indicated? YES - Check for poor connections or loose terminals at starter cut relay 2 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.

DTC P16BE: Starter Cut Relay 1 Malfunction

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 and wait 5 seconds.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BE indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 and the PCM.
4. Turn the ignition switch OFF.
5. Replace starter relay 1 (ST CUT).
6. Turn the ignition switch ON (II).
7. Reset the PCM with the HDS.
8. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
9. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BE indicated? YES - Check for poor connections or loose terminals at starter cut relay 1 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.

DTC P16BF: Starter Cut Relay STRLY Circuit Malfunction

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

Scheme 86

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS and wait 5 seconds.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
4. Turn the ignition switch OFF.
5. Jump the SCS line with the HDS.
6. Remove starter cut relay 1 and starter cut relay 2.
7. Disconnect PCM connector A (49P).
8. Check for continuity between PCM connector terminal A3 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A3) and starter cut relay 1 or starter cut relay 2, then go to step 9. NO - Go to step 14 .
9. Reconnect all connectors.
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/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF indicated? YES - Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, 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 «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
16. Check for Temporary DTCs or DTCs with the HDS. Is DTC P16BF indicated? YES - Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM, then go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2183: ECT Sensor 2 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 ). If DTC P0111 is stored at the same time as DTC P2183, troubleshoot DTC P0111 first, then recheck for DTC P2183.

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES - Go to step 2. NO - Repair the connectors or terminals, then go to step 27 .
2. Turn the ignition switch ON (II).
3. Check for Temporary DTCs or DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES - Go to step 15 . NO - Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES - Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Drain the coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
8. Remove ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
9. Allow ECT sensor 2 to cool to ambient temperature.
10. Note the ambient temperature.
11. Connect ECT sensor 2 to its 2P connector, but do not install it on the engine.
12. Turn the ignition switch ON (II).
13. Note the value of ECT SENSOR 2 quickly in the DATA LIST with the HDS.
14. Compare the value of ECT SENSOR 2 and the ambient temperature. Does ECT SENSOR 2 differ 5.4°F (3°C) or more? YES - Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
15. Start the engine, and let it idle for 10 minutes.
16. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 118°F (48°C) or less, or 1.75 V or more indicated? YES - Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 17.
17. Let the engine idle for 10 minutes.
18. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 131°F (55°C) or less, or 1.50 V or more indicated? YES - Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 27 . NO - Go to step 19.
19. Turn the ignition switch OFF.
20. Drain the coolant (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
21. Remove ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ), and ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
22. Allow the sensors to cool to ambient temperature.
23. Note the ambient temperature.
24. Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install them on the engine.
25. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
26. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensor differ more than 5.4°F (3°C) from the ambient temperature? YES - Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 27. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then reconnect all connectors, and refill the cooling system (see «COOLANT CHECK»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
27. Turn the ignition switch ON (II).
28. Reset the PCM with the HDS.
29. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
30. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2183 indicated? YES - Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, 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.

DTC P2184: ECT Sensor 2 Circuit Low 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 87

1. Turn the ignition switch ON (II).
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor 2 2P connector.
5. Turn the ignition switch ON (II).
6. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES - Go to step 7. NO - Go to step 11 .
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between ECT sensor 2 and the PCM (A21), then go to step 13 . NO - Go to step 18 .
11. Turn the ignition switch OFF.
12. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2184 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 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.
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2184 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2185: ECT Sensor 2 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 88

Scheme 89

Scheme 90

Scheme 91

1. Turn the ignition switch ON (II).
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 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 ECT sensor 2 and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor 2 2P connector.
5. Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES - Go to step 8. NO - Go to step 20 .
8. Turn the ignition switch OFF.
9. Remove the jumper wire from the ECT sensor 2 2P connector.
10. Turn the ignition switch ON (II).
11. Measure voltage between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 12. NO - Go to step 16 .
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (49P).
15. Check for continuity between PCM connector terminal A27 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (A27) and ECT sensor 2, then go to step 22 .
16. Turn the ignition switch OFF.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector A (49P).
19. Check for continuity between PCM connector terminal A21 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (A21) and ECT sensor 2, then go to step 22 .
20. Turn the ignition switch OFF.
21. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 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.
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2185 indicated? YES - Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated/substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - If the PGM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2195: Rear A/F Sensor (Bank 1, Sensor 1) Signal Stuck Lean; DTC P2197: Front A/F Sensor (Bank 2, Sensor 1) Signal Stuck Lean

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2). If the vehicle was out of fuel and the engine stalled before this DTC was stored, refuel, and clear the DTC with the HDS. If DTC P2101, P2118, P2135, P2138, P2176, or a combination of P2122 and P2127, P2122 and P2138 or P2127 and P2138 is stored at the same time as DTC P2195 (P2197)*, troubleshoot those DTCs first, then recheck for DTC P2195 (P2197)*.

1. Check the installation of the A/F sensor (Sensor 1). Is the A/F sensor loose or disconnected from the exhaust pipe? YES - Go to step 6 . NO - Go to step 2.
2. Turn the ignition switch ON (II).
3. Clear the DTC with the HDS.
4. Start the engine, then let it idle.
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 13 . NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If any other Temporary DTCs or DTCs are indicated, go to .
6. Turn the ignition switch OFF.
7. Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 12.
12. Monitor the OBD STATUS for DTC P2195 and/or P2197* 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 11 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
13. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
14. 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.
15. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 14 . If the PCM was substituted, go to step 1 . NO - Go to step 16.
16. Monitor the OBD STATUS for DTC P2195 and/or P2197* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 15 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2227: BARO Sensor 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 ). If DTC P0107, P0108, P1128, and/or P1129 are stored at the same time as DTC P2227, troubleshoot those DTCs first, then recheck for DTC P2227.

1. Turn the ignition switch ON (II), and wait 2 seconds.
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 101 kPa (29.9 in.Hg, 760 mmHg), or about 2.9 V at sea level indicated? YES - Go to step 3. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
3. Clear the DTC with the HDS.
4. 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.
5. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Throttle position between 17 degrees and 33 degrees for 3 seconds
6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Intermittent failure, the system is OK at this time. NO - If the screen indicates FAILED, go to step 7. If the screen indicates NOT COMPLETED, go to step 5 .
7. Check the condition of the air cleaner element. Is the air cleaner element OK? YES - Go to step 8. NO - Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ).
8. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Throttle position between 17 degrees and 33 degrees for 3 seconds
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2227 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 11 . If the PCM was substituted, go to step 1 . NO - Go to step 14.
14. Monitor the OBD STATUS for DTC P2227 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 IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ). 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 11 . If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 11 .

DTC P2228: BARO Sensor Circuit Low Voltage

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. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 43 kPa (12.7 in.Hg, 323 mmHg), or 1.31 V or less indicated? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2228 indicated? YES - Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3 , 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2229: BARO 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 ).

1. Turn the ignition switch ON (II).
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.2 in.Hg, 1,200 mmHg), or 4.49 V, or more indicated? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2229 indicated? YES - Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3 , 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2237: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage; DTC P2240: Front A/F Sensor (Bank 2, Sensor 1) IP 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 ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 92

Scheme 93

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 5 to and PCM connector terminal B31 (B32)*. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 5 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2237 and/or P2240* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2237 and/or P2240* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2238: Rear A/F Sensor (Bank 1, Sensor DIP Circuit Low Voltage; DTC P2241: Front A/F Sensor (Bank 2, Sensor 1) IP Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 94

Scheme 95

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B31 (B32)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10.
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 5 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2238 and/or P2241* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 , If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2238 and/or P2241* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2243: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage; DTC P2247: Front A/F Sensor (Bank 2, Sensor 1) VCENT 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 ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 96

Scheme 97

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 8P connector terminal No. 6 and PCM connector terminal B15 (B24)*. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 6 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2243 and/or P2247* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2243 and/or P2247* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2245: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit Low Voltage; DTC P2249: Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 98

Scheme 99

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B15(B24)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10.
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1)6P connector terminal No. 6 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2245 and/or P2249* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2245 and/or P2249* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2251: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage; DTC P2254: Front A/F Sensor (Bank 2, Sensor 1) VS 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 ). If DTC P2251 and/or P2254* is stored at the same time as DTC P0134 and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then recheck for P0134 and/or P0154*. Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 100

Scheme 101

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 4 and PCM connector terminal B13(B14)*. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2251 and/or P2254* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. If DTC P2251 and/or P2254* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2251 and/or P2254* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2252: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit Low Voltage; DTC P2255: Front A/F Sensor (Bank 2, Sensor 1) VS Circuit Low Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

Scheme 102

Scheme 103

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 2 minutes.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B13(B14)* and body ground. Is there continuity? YES - Repair short in the wire between the PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 14 . NO - Go to step 10.
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES - Go to step 20 . NO - Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 19.
19. Monitor the OBD STATUS for DTC P2252 and/or P2255* 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 18 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
20. Turn the ignition switch OFF.
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 24.
24. Monitor the OBD STATUS for DTC P2252 and/or P2255* 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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs were indicated in step 23 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2270: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Lean; DTC P2271: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit Signal Stuck Rich; DTC P2272: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Lean; DTC P2273: Front Secondary HO2S (Bank 2, Sensor 2) Circuit Signal Stuck Rich

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

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 1) above 158°F (70°C) Vehicle speed between 35-55 mph (56-88 km/h) Drive 1 minute or more
5. Monitor the OBD STATUS for DTC P2270, P2271, P2272*, and/or P2273* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the screen indicates EXECUTING, keep driving until a result comes on. (f the screen indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch OFF.
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Vehicle speed between 35-55 mph (56-88 km/h) Drive 1 minute or more
13. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2270, P2271, P2272*, and/or P2273* indicated? YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO - Go to step 14.
14. Monitor the OBD STATUS for DTC P2270, P2271, P2272*, and/or P2273* 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 secondary HO2S (Sensor 2) 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 .

DTC P2610: PCM Internal Power Off Timer 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 ).

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2610 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2610 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC P2A00: Rear A/F Sensor (Bank 1, Sensor 1) Range/Performance Problem; DTC P2A03: Front A/F Sensor (Bank 2, Sensor 1) 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 ). Information marked with an asterisk (*) applies to the front bank (Bank 2).

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 1) above 158°F (70°C) Transmission in D position Vehicle speed between 25-55 mph (40-88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for at least 6 seconds.
5. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES - Go to step 6. NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If it is EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch OFF.
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
11. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D position Vehicle speed between 25-55 mph (40- 88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for at least 6 seconds.
12. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2A00 and/or P2A03* indicated? YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO - Go to step 13.
13. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* 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 12 , go to the indicated DTCs troubleshooting. NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) 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 11 .

DTC U0028: F-CAN Malfunction (BUS-OFF (PCM))

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. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0028 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0028 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#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/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

DTC U0114: F-CAN Malfunction (PCM-SH-AWD Control Unit)

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC U0028 is stored at the same time as DTC U0114, troubleshoot DTC U0028 first, then recheck for DTC U0114.

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1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC U0114 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the SH-AWD control unit, and the PCM.
4. Check for DTCs in the DTCs MENU with the HDS. Is SH-AWD system DTC 41 indicated? YES - Go to step 5. NO - Go to step 8 .
5. Turn the ignition switch OFF.
6. Disconnect the SH-AWD control unit 20P connector.
7. Check for continuity between SH-AWD control unit 20P connector terminals No. 10 and No. 20*. Is there continuity? YES - Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 15 and recheck. If DTC U0114 is not indicated, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 15 . NO - Repair open in the wire between the SH-AWD control unit (No. 10 (No. 20)*) and the PCM (A48 (A49)*), then go to step 15 . *: CANL line
8. Check for a poor connections at the SH-AWD control unit 20P connector and 8P connector. Are the connections OK? YES - Go to step 9. NO - Repair the connections, then go to step 15 .
9. Turn the ignition switch OFF.
10. Disconnect the SH-AWD control unit 20P connector.
11. Turn the ignition switch ON (II).
12. Measure voltage between SH-AWD control unit 20P connector terminal No. 7 and body ground. Is there battery voltage? YES - Go to step 13. NO - Check the No. 20 SVTM-4, ARC, ODS (7.5 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 20 STVM-4, ARC, ODS (7.5 A) fuse and the SH-AWD control unit, then go to step 15 .
13. Turn the ignition switch OFF.
14. Check for continuity between SH-AWD control unit 20P connector terminals No. 9 and body ground, and between SH-AWD control unit 8P connector terminal No. 2 and No. 3 and body ground individually. Is there continuity? YES - Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 15 and recheck. If DTC U0114 is not indicated, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 15. NO - Repair open in the wire between the SH-AWD control unit and body ground (G603), then go to step 15.
15. Reconnect all connectors.
16. Turn the ignition switch ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
19. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Is DTC U0114 indicated? YES - Check for poor connections or loose terminals at the gauge control module, the SH-AWD control unit, and the PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs indicated, go to the indicated DTCs troubleshooting.

DTC U0122: F-CAN Malfunction (PCM-VSA Modulator-Control Unit)

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

Scheme 108

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1. Turn the ignition switch ON (II).
2. Check for Temporary DTCs or DTCs with the HDS. Are DTC U0028 and U0122 indicated at the same time? YES - Go to troubleshooting for DTC U0028. NO - Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES - Go to step 5. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module, the VSA modulator-control unit, and the PCM.
5. Check for communication to the VSA system with the HDS. Does the HDS communicate with the VSA modulator-control unit? YES - Go to step 6. NO - Go to the «DLC circuit troubleshooting»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) .
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect the VSA modulator-control unit 46P connector.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A48 and VSA modulator-control unit 46P connector terminal No. 39. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the PCM (A48) and the VSA modulator-control unit, then go to step 12 .
11. Check for continuity between PCM connector terminal A49 and VSA modulator-control unit 46P connector terminal No. 38. Is there continuity? YES - Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12 and recheck. If DTC U0122 is not indicated, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12. NO - Repair open in the wire between the PCM (A49) and the VSA modulator-control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0122 indicated? YES - Check for poor connections or loose terminals at the gauge control module, the VSA modulator unit, 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.

DTC U0155: F-CAN Malfunction (PCM-Gauge Control Module)

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

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1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0155 indicated? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module and the PCM.
4. Check for body electrical DTCs in the DTCs MENU with the HDS. Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 5. NO - Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ).
5. Turn the ignition switch OFF.
6. Jump the SCS line with the HDS.
7. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
8. Disconnect gauge control module connector A (12P).
9. Disconnect PCM connector A (49P).
10. Connect gauge control module connector terminal A12 to body ground with a jumper wire.
11. Check for continuity between PCM connector terminal A48 and body ground. Is there continuity? YES - Go to step 12. NO - Repair open in the wire between the PCM (A48) and the gauge control module, then go to step 14 .
12. Connect gauge control module connector terminal A6 to body ground with a jumper wire.
13. Check for continuity between PCM connector terminal A49 and body ground. Is there continuity? YES - Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step Hand recheck. If DTC U0155 is not indicated, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step 14. NO - Repair open in the wire between the PCM (A49) and the gauge control module, then go to step 14.
14. Reconnect all connectors.
15. Turn the ignition switch ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0155 indicated? YES - Check for poor connections or loose terminals at the gauge control module 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.

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Do not turn the ignition switch OFF while updating the PCM. If you turn the ignition switch OFF before completion, the PCM will be damaged.

1. Do the PCM update procedure {PGM-FI system) (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
2. Do the PCM update procedure (A/T system) (see «SUBSTITUTE THE PCM»(/acura/mdx/ii-2006-2010/remont/automatic-trans/#automatic-transmission) ).
3. Check for Temporary DTCs or DTCs with the HDS. Is DTC U0300 indicated? YES - Replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

F-CAN Circuit Troubleshooting (Part 1)

Note. Information marked with an asterisk (*) applies to the CANL line.

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1. Turn the ignition switch OFF.
2. Jump the SCS line with the HDS.
3. Disconnect PCM connector A (49P), then disconnect the HDS.
4. Measure resistance between PCM connector terminals A48 and A49. Is there about 333-408 ohms? YES - Go to «F-CAN CIRCUIT TROUBLESHOOTING (PART 2)»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system) NO - Go to step 5.
5. Disconnect gauge control module connector A (12P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
6. Disconnect the VSA modulator-control unit 46P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
7. Disconnect SRS unit connector A (28P) (see «SRS UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
8. Disconnect the TPMS unit 20P connector (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
9. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
10. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ).
11. Disconnect the SH-AWD control unit 20P connector (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
12. With active damper system: Disconnect the active damper control unit 14P connector (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
13. With AcuraLink: Disconnect AcuraLink control unit (XM receiver) connector A (20P) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#audio-system__acuralink-control-unit-xm-receiver-removalinstallation) ).
14. Check for continuity between PCM connector terminals A48 and A49*. Is there continuity? YES - Repair short in the wires between PCM connector terminals A48 and A49*. NO - Go to step 15.
15. Connect PCM connector terminal A48 to body ground with a jumper wire.
16. Check for continuity between gauge control module connector terminal A12 and body ground. GAUGE CONTROL MODULE CONNECTOR A (12P) Is there continuity? YES - Go to step 17. NO - Repair open in the wire between the PCM (A48) and the gauge control module.
17. Check for continuity between VSA modulator-control unit 46P connector terminal No. 39 and body ground. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the PCM (A48) and the VSA modulator-control unit.
18. Check for continuity between SH-AWD control unit 20P connector terminal No. 10 and body ground. Is there continuity? YES - Go to step 19. NO - Repair open in the wire between the PCM (A48) and the SH-AWD control unit.
19. Remove the jumper wire from PCM connector A (49P).
20. Connect PCM connector terminal A49 to body ground with a jumper wire.
21. Check for continuity between gauge control module connector terminal A6 and body ground. GAUGE CONTROL MODULE CONNECTOR A (12P) CANL (RED) Is there continuity? YES - Go to step 22. NO - Repair open in the wire between the PCM (A49) and the gauge control module.
22. Check for continuity between VSA modulator-control unit 46P connector terminal No. 38 and body ground. Is there continuity? YES - Go to step 23. NO - Repair open in the wire between the PCM (A49) and the VSA modulator-control unit.
23. Check for continuity between SH-AWD control unit 20P connector terminal No. 20 and body ground. Is there continuity? YES - Go to step 24. NO - Repair open in the wire between the PCM (A49) and the SH-AWD control unit.
24. Reconnect the gauge control module 12P connector.
25. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 26. NO - Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). If the HDS identifies the vehicle, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
26. Disconnect gauge control module connector A (12P).
27. Reconnect the VSA modulator-control unit 46P connector.
28. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 29. NO - Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
29. Disconnect the VSA modulator-control unit 46P connector.
30. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
31. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 32. NO - Substitute a known-good yaw rate-lateral/ longitudinal acceleration sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). If the HDS identifies the vehicle, replace the original yaw rate-lateral/longitudinal acceleration sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
32. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
33. Reconnect the steering angle sensor 5P connector.
34. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 35. NO - Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ). If the HDS identifies the vehicle, replace the original steering angle sensor (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-center-point-writing) ).
35. Disconnect the steering angle sensor 5P connector.
36. Reconnect SRS unit connector A (28P).
37. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 38. NO - Substitute a known-good SRS unit (see «SRS UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ). If the HDS identifies the vehicle, replace the original SRS unit (see «SRS UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
38. Disconnect SRS unit connector A (28P).
39. Reconnect the TPMS control unit 20P connector.
40. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - With active damper system: Go to step 41. Without active damper system: Go to step 44 . NO - Substitute a known-good TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). If the HDS identifies the vehicle, replace the original TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
41. Disconnect the TPMS control unit 20P connector.
42. Reconnect the active damper control unit 14P connector.
43. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Go to step 44. NO - Substitute a known-good active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). If the HDS identifies the vehicle, replace the original active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
44. Disconnect the TPMS control unit 20P connector or the active damper control unit 14P connector.
45. Reconnect SH-AWD control unit 20P connector.
46. Measure resistance between PGM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - With: AcuraLink: Go to step 47. Without: AcuraLink: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). If the HDS identifies the vehicle, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
47. Disconnect the SH-AWD control unit 20P connector.
48. Reconnect AcuraLink control unit (XM receiver) connector A (20P).
49. Measure resistance between PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - Update the PCM if it does not have the latest software (see ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Substitute a known-good AcuraLink control unit (XM receiver) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#audio-system__acuralink-control-unit-xm-receiver-removalinstallation) ). If the HDS identifies the vehicle, replace the original AcuraLink control unit (XM receiver) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#audio-system__acuralink-control-unit-xm-receiver-removalinstallation) ).

Scheme 133

Scheme 134

1. Disconnect gauge control module connector A (12P) (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
2. Disconnect the VSA modulator-control unit 25P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ).
3. Disconnect SRS unit connector A (28P) (see «SRS UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ).
4. Disconnect TPMS control unit connector A (20P) (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
5. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ).
6. Disconnect the steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ).
7. Disconnect SH-AWD control unit connector A (20P) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
8. With active damper system: Disconnect the active damper control unit 14P connector (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ).
9. With AcuraLink: Disconnect AcuraLink control unit (XM receiver) connector A (20P) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/entertainment-systems/#audio-system__acuralink-control-unit-xm-receiver-removalinstallation) ).
10. Check for continuity between PCM connector terminal A48 and body ground. Is there continuity? YES - Repair short in the wire between PCM connector terminal A48 and the gauge control module, the VSA modulator-control unit, the SRS unit, the TPMS control unit, the yaw rate-lateral/ longitudinal acceleration sensor, the steering angle sensor, the SH-AWD control unit, the active damper control unit (with active damper system), the AcuraLink control unit (XM receiver (with AcuraLink)), or the DLC. NO - Go to step 11.
11. Check for continuity between PCM connector terminal A49 and body ground. Is there continuity? YES - Repair short in the wire between PCM connector terminal A49 and the gauge control module, the VSA modulator-control unit, the SRS unit, the TPMS control unit, the yaw rate-lateral/ longitudinal acceleration sensor, the steering angle sensor, the SH-AWD control unit, the active damper control unit (with active damper system), the AcuraLink control unit (XM receiver (with AcuraLink)), or the DLC. NO - Go to step 12.
12. Reconnect all connectors.
13. Connect the HDS to the DLC (see «HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__how-to-use-the-hds-honda) ).
14. Disconnect gauge control module connector A (12P).
15. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO - Go to step 16.
16. Turn the ignition switch OFF.
17. Reconnect gauge control module connector A (12P).
18. Disconnect the VSA modulator-control unit 46P connector.
19. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__vsa-modulator-control-unit-removal-and-installation) ). NO - Go to step 20.
20. Turn the ignition switch OFF.
21. Reconnect the VSA modulator-control unit 46P connector.
22. Disconnect SRS unit connector A (28P).
23. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the SRS unit (see «SRS UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ). NO - Go to step 24.
24. Turn the ignition switch OFF.
25. Reconnect SRS unit connector A (28P).
26. Disconnect TPMS control unit connector A (20P).
27. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). NO - Go to step 28.
28. Turn the ignition switch OFF.
29. Reconnect TPMS control unit connector A (28P).
30. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
31. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__yaw-rate-laterallongitudinal-acceleration-sensor-replacement) ). NO - Go to step 32.
32. Turn the ignition switch OFF.
33. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 4P connector.
34. Disconnect the steering angle sensor 5P connector.
35. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system__steering-angle-sensor-replacement) ). NO - With active damper system: Go to step 36. Without active damper system: Go to step 40 .
36. Turn the ignition switch OFF.
37. Reconnect the steering angle sensor 5P connector.
38. Disconnect the active damper control unit 14P connector.
39. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the active damper control unit (see «ACTIVE DAMPER CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Go to step 40.
40. Turn the ignition switch OFF.
41. Reconnect the steering angle sensor 5P connector or the active damper control unit 14P connector.
42. Disconnect SH-AWD control unit connector A (20P)
43. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO - With: AcuraLink: Go to step 44. Without: AcuraLink: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
44. Turn the ignition switch OFF.
45. Reconnect the SH-AWD control unit 20P connector.
46. Disconnect AcuraLink control unit (XM receiver) connector A (20P).
47. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Replace the AcuraLink control unit (XM receiver). NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

Scheme 135

1. Turn the ignition switch ON (II).
2. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ). Does the MIL indicator flash? YES - Go to step 3. NO - Substitute a known-good gauge control module, and recheck. If the MIL circuit is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
3. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
4. Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES - Go to step 5. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
5. Turn the ignition switch OFF.
6. Disconnect PCM connector A (49P), then disconnect the HDS.
7. Check for continuity between PCM connector terminal A32 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A32) and the SRS unit, the DLC. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

DLC Circuit Troubleshooting

Note. Make sure the HDS and the DLC cable of the HDS is normal.

Scheme 136

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Scheme 157

Scheme 158

1. Turn the ignition switch OFF.
2. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ). NOTE: Make sure the HDS is properly connected to the DLC.
3. Turn the ignition switch ON (II), and read the HDS. Does the HDS identify the vehicle? YES - Go to step 4. NO - Go to step 25 .
4. Check for Temporary DTCs or DTCs in the PGM-FI system with the HDS. Are any Temporary DTCs or DTCs indicated? YES - Go to the indicated DTCs troubleshooting. NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II), and watch the SRS indicator. Does the SRS indicator stay on? YES - Go to the SRS system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/airbag/#srs-supplemental-restraint-system) ). NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Turn the ignition switch ON (II), and watch the VSA indicator. Does the VSA indicator stay on? YES - Go to the VSA system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system) ). NO - Go to step 9.
9. Turn the ignition switch OFF.
10. Turn the ignition switch ON (II), and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES - Go to the immobilizer system's troubleshooting (see «SYMPTOM TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/door-locks-anti-theft-systems/#immobilizer-system) ). NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Turn the ignition switch ON (II), and watch the SH-AWD indicator. Does the SH-AWD indicator stay on? YES - Go to the SH-AWD system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/differentials-drive-axles/#rear-differential) ). NO - Go to step 13.
13. Turn the ignition switch OFF.
14. Turn the ignition switch ON (II), and watch the multi-information display. Does the TPMS indicator stay on? YES - Go to the TPMS system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - With active damper system: Go to step 15. Without active damper system: Go to step 17 .
15. Turn the ignition switch OFF.
16. Turn the ignition switch ON (II), and watch the active damper system indicator. Does the active damper system indicator stay on? YES - Go to the active damper system's general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/electronic-suspension/#active-damper-system) ). NO - Go to step 17.
17. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ) to make sure the gauge is known-good. If the function test is OK, go to step 18.
18. Check for B-CAN system DTCs without the HDS (see «WITHOUT HDS (USE ONLY IF THE HDS IS UNAVAILABLE)»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__without-hds-use-only-if-the) ). Are any B-CAN DTCs indicated? YES - Go to the indicated DTCs troubleshooting. NO - Go to step 19.
19. Turn the ignition switch OFF.
20. Disconnect the HDS from the DLC.
21. Check for continuity between DLC terminal No. 7 and body ground. Is there 5 ohms or less? YES - Go to step 22. NO - Go to step 23 .
22. Continue to check for continuity between DLC terminal No. 7 and body ground, while disconnecting these parts, one at a time: SRS unit connector A (28P) VSA modulator-control unit 46P connector Immobilizer-keyless control unit 7P connector Audio unit 17P connector SH-AWD control unit 20P connector Active damper control unit 14P connector TPMS control unit 20P connector MICU connector P (30P) Does continuity go away when one of the above components is disconnected? YES - Replace the part that caused an open when it was disconnected. NO - Repair short in the wire between the DLC (K-line) and the SRS unit, the VSA modulator-control unit, the immobilizer-keyless control unit, the audio unit, the SH-AWD control unit, the active damper control unit, or the TPMS control unit, or the MICU.
23. Connect DLC terminal No. 7 to body ground with a jumper wire.
24. Check for continuity between body ground and these connector terminals: CONNECTOR TERMINALS CHART Connector Terminal SRS unit A(28P) No. 24 (LT BLU) VSA modulator-control unit 46P No. 15 (LT BLU) Immobilizer-keyless control unit 7P No. 5 (LT BLU) Audio unit 17P No. 6 (LT BLU) SH-AWD control unit 20P No. 5 (LT BLU) Active damper control unit 14P No. 3 (LT BLU) TPMS control unit 20P No. 7 (LT BLU) MICU 30P No. 6 (LT BLU) Is there continuity between the DLC terminal and each of the terminals in the chart? YES - Replace the unit that does not communicate with the HDS. NO - Repair open in the wire between the DLC (K-line) and the appropriate connector.
25. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/mdx/ii-2006-2010/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ) to make sure the gauge is known-good. If the function test is OK, go to step 22 .
26. Check for B-CAN system DTCs without the HDS (see «WITHOUT HDS (USE ONLY IF THE HDS IS UNAVAILABLE)»(/acura/mdx/ii-2006-2010/remont/communication-devices/#multiplex-integrated-control-system__without-hds-use-only-if-the) ). Is DTC B1168, B1169, and/or B1178 indicated? YES - Go to step 39 . NO - Go to step 27.
27. Turn the ignition switch OFF
28. Disconnect the HDS from the DLC.
29. Measure voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES - Go to step 30. NO - Repair open in the wire between DLC terminal No. 16 and the No. 7 BACK UP (10 A) fuse in the under-dash fuse/relay box.
30. Measure voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES - Go to step 31. NO - Repair open in the wire between DLC terminal No. 4 and G503.
31. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
32. Jump the SCS line with the HDS.
33. Disconnect PCM connector A (49P).
34. Disconnect the HDS from the DLC.
35. Connect DLC terminal No. 6 to body ground with a jumper wire.
36. Check for continuity between PCM connector terminal A48 and body ground. Is there continuity? YES - Go to step 37. NO - Repair open in the wire between the PCM (A48) and DLC terminal No. 6.
37. Disconnect the jumper wire from DLC terminal No. 6, then connect DLC terminal No. 14 to body ground with a jumper wire.
38. Check for continuity between PCM connector terminal A49 and body ground. Is there continuity? YES - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Repair open in the wire between the PCM (A49) and DLC terminal No. 14.
39. Try to start the engine. Does the engine start and idle smoothly? YES - Go to F-CAN circuit troubleshooting (see «F-CAN Circuit Troubleshooting (Part 1)»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__f-can-circuit-troubleshooting-part-1) ). NO - Go to step 40.
40. Turn the ignition switch OFF.
41. Check the No. 3 IG1 MAIN (50 A) fuse in the main under-hood fuse box. Is the fuse OK? YES - Repair open in the wire between the No. 3 IG1 MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 42. NO - Repair short in the wire between the No. 3 IG1 MAIN (50 A) fuse and the main under-hood fuse box. Also replace the No. 3 IG1 MAIN (50 A) fuse.
42. Inspect the No. 8 IGP (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 48 . NO - Go to step 43.
43. Remove the blown No. 8 IGP (15 A) fuse from the under-hood fuse/relay box.
44. Jump the SCS line with the HDS.
45. Disconnect PCM connector B (49P).
46. Check for continuity between PCM connector terminal B3 and body ground. Is there continuity? YES - Go to step 47. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 8 IGP (15 A) fuse in the under-hood fuse/relay box.
47. Disconnect each of the components or connectors below, one at a time, and check for continuity between PCM connector terminal B3 and body ground. PGM-FI main relay 2 Each injector 2P connector Camshaft position (CMP) sensor 3P connector Crankshaft position (CKP) sensor 6P connector Under-hood fuse/relay box 9P connector Does continuity go away when one of the above components is disconnected? YES - Replace the component that made the short to body ground go away when disconnected. Also replace the No. 8 IGP (15 A) fuse. NO - Repair short in the wire between the PCM (B3) and the PGM-FI main relay 2, the injector, the CKP sensor, or the under-hood fuse/relay box. Also replace the No, 8 IGP (15 A) fuse in the under-hood fuse/relay box.
48. Inspect the No. 19 FUEL PUMP (20 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES - Go to step 55 . NO - Go to step 49.
49. Remove the blown No. 19 FUEL PUMP (20 A) fuse in the under-dash fuse/relay box.
50. Jump the SCS line with the HDS.
51. Disconnect PCM connector B (49P).
52. Check for continuity between PCM connector terminal B42 and body ground. Is there continuity? YES - Go to step 53. NO - Replace the No. 19 FUEL PUMP (20 A) fuse in the under-dash fuse/relay box, and update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
53. Disconnect the dashboard wire harness 39P connector from socket X on the under-dash fuse/relay box (A) (see «UNDER-DASH FUSE/RELAY BOX»(/acura/mdx/ii-2006-2010/remont/body-electrical/#fuserelay-boxes__under-dash-fuserelay-box) ).
54. Check for continuity between PCM connector terminal B42 and body ground. Is there continuity? YES - Repair short in the wire between the under-dash fuse/relay box and the PCM (B42), or between the under-dash fuse/relay box and the immobilizer control unit. Also replace the No. 19 FUEL PUMP (20 A) fuse in the under-dash fuse/relay box. NO - Replace the under-dash fuse/relay box.
55. Jump the SCS line with the HDS.
56. Disconnect PCM connectors A (49P) and B (49P).
57. Turn the ignition switch ON (II).
58. Measure voltage between PCM connector terminal B42 and body ground. Is there battery voltage? YES - Go to step 59. NO - Repair open in the wire between the No. 19 FUEL PUMP (20 A) fuse and the PCM (B42).
59. Measure voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES - Go to step 63 . NO - Go to step 60.
60. Turn the ignition switch OFF.
61. Disconnect the under-hood fuse/relay box 14P connector.
62. Check for continuity between PCM connector terminal A6 and under-hood fuse/relay box 14P connector terminal No. 5. Is there continuity? YES - Replace the under-hood fuse/relay box. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO - Repair open in the wire between the PCM (A6) and the under-hood fuse/relay box.
63. Turn the ignition switch OFF.
64. Disconnect the under-hood fuse/relay box 9P connector.
65. Check for continuity between PCM connector terminal B3 and under-hood fuse/relay box 9P connector terminal No. 1. Is there continuity? YES - Go to step 66. NO - Repair open in the wire between the PCM (B3) and the under-hood fuse/relay box.
66. Test PGM-FI main relay 1 in the under-hood fuse/ relay box (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES - Go to step 67. NO - Replace the relay control module (under-hood fuse/relay box) (see «REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/body-electrical/#under-hood-fuserelay-box) ).
67. Disconnect PCM connector C (49P).
68. Check for continuity between body ground and PCM connector terminals B1, B40, B41, C1, and C41 individually. Is there continuity? YES - Go to step 69. NO - Repair open in the wire between the PCM (B1, B40, B41, C1, C41) and G101.
69. Check for continuity between PCM connector terminal B36 and body ground. Is there continuity? YES - Go to step 70. NO - Go to step 71 .
70. Continue to check for continuity between PCM connector terminal B36 and body ground, while disconnecting these parts, one at a time: MAP sensor 3P connector Output shaft (countershaft) speed sensor 3P connector Does continuity go away when one of the above components is disconnected? YES - Replace the part that caused an open when it was disconnected. NO - Repair short in the wire between the PCM (B36) and the MAP sensor, or the output shaft (countershaft) speed sensor.
71. Check for continuity between PCM connector terminal C12 and body ground. Is there continuity? YES - Go to step 72. NO - Go to step 73 .
72. Continue to check for continuity between PCM connector terminal C12 and body ground, while disconnecting these parts, one at a time: EGR valve 6P connector Input shaft (mainshaft) speed sensor 3P connector Does continuity go away when one of the above components is disconnected? YES - Replace the part that caused an open when it was disconnected. NO - Repair short in the wire between the PCM (C12) and the EGR valve or the input shaft (mainshaft) speed sensor.
73. Check for continuity between PCM connector terminal A24 and body ground. Is there continuity? YES - Go to step 74. NO - Go to step 75 .
74. Continue to check for continuity between PCM connector terminal A24 and body ground, while disconnecting the APP sensor 6P connector. Is there continuity? YES - Repair short in the wire between the PCM (A24) and APP sensor A. NO - Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
75. Check for continuity between PCM connector terminal A25 and body ground. Is there continuity? YES - Go to step 76. NO - Go to step 77 .
76. Continue to check for continuity between PCM connector terminal A25 and body ground, while disconnecting these connectors one at a time. APP sensor 6P connector FTP sensor 3P connector Does continuity go away when one of the above components is disconnected? YES - Replace the part that caused an open when it was disconnected. NO - Repair short in the wire between the PCM (A25) and APP sensor B or the FTP sensor.
77. Check for continuity between PCM connector terminal B18 and body ground. Is there continuity? YES - Go to step 78. NO - Go to step 79 .
78. Continue to check for continuity between PCM connector terminal B18 and body ground, while disconnecting the throttle body 6P connector. Is there continuity? YES - Repair short in the wire between the PCM (B18) and the throttle body. NO - Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
79. Check for continuity between PCM connector terminal C11 and body ground. Is there continuity? YES - Go to step 80. NO - Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
80. Continue to check for continuity between PCM connector terminal C11 and body ground, while disconnecting the IMT actuator. Is there continuity? YES - Repair short in the wire between the PCM (C11) and the IMT actuator. NO - Replace the IMT actuator (see «IMT ACTUATOR REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) ).

Scheme 159

Scheme 160

1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Remove the intake manifold (see «REMOVAL»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
3. Disconnect the connectors from the injectors (A).
4. Disconnect the quick-connect fitting (B).
5. Remove the fuel rail mounting bolts (C) and nut (D) from the fuel rails (E).
6. Remove the injector clips (F) from the fuel rail.
7. Remove the injectors from the rails.
8. Coat the new O-ring (A) with clean engine oil, and insert the injectors (B) into the fuel rails (C).
9. Install the injector clips (D).
10. Coat the new injector O-ring (E) with clean engine oil.
11. Install the injectors in the injector base.
12. Install the fuel rail mounting bolts and nut.
13. Install the injector connectors.
14. Connect the quick-connect fitting (see «FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS»(/acura/mdx/ii-2006-2010/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-precautions) ).
15. Turn the ignition switch ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel pressure in the fuel line rises. Repeat this two or three times, then check for fuel leakage.
16. Install the intake manifold.

Scheme 161

1. Remove the engine cover (see step 1 «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Disconnect the MAP sensor connector (A).
3. Remove the screw (B).
4. Remove the MAP sensor (C).
5. Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 162

1. Disconnect the MAF sensor/IAT senor connector (A).
2. Remove the screw (B).
3. Remove the MAF sensor/IAT senor (G).
4. Install the parts in the reverse order of removal with a new gasket (D).

Scheme 163

1. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
2. Remove the engine cover (see step 1 «REMOVAL»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
3. Remove the main under-hood fuse/relay box.
4. Disconnect the ECT sensor 1 connector (A).
5. Remove ECT sensor 1 (B).
6. Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 164

1. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).
2. Remove the splash shield.
3. Disconnect the ECT sensor 2 connector (A).
4. Remove ECT sensor 2 (B).
5. Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/cooling-system-mechanical/#cooling-system) ).

A/F Sensor Replacement

Special Tools Required

O2 sensor socket wrench, Snap-on YA8875 or SWR2, or equivalent, commercially available

Scheme 165

1. Disconnect the front A/F sensor connector (A), then remove the A/F sensor (B).
2. Install the parts in the reverse order of removal.

Scheme 166

1. Disconnect the rear A/F sensor connector (A), then remove the rear A/F sensor (B).
2. Install the parts in the reverse order of removal.

Secondary HO2S Replacement

Special Tools Required

O2 sensor socket wrench. Snap-on YA8875 or SWR2, or equivalent, commercially available

Scheme 167

1. Disconnect the front secondary HO2S 4P connector (A), then remove the front secondary HO2S (B).
2. Install the parts in the reverse order of removal.

Scheme 168

1. Disconnect the rear secondary HO2S 4P connector (A), then remove the rear secondary HO2S (B).
2. Install the parts in the reverse order of removal.

Scheme 169

Scheme 170

1. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ).
2. Remove the front camshaft pulley (CMP sensor pulse plate) (A).
3. Disconnect the CMP sensor connector (B), then remove the back cover (C).
4. Remove the CMP sensor (A) from the back cover.
5. Install the parts in the reverse order of removal. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__timing-belt-installation) ).
6. Do the CKP pattern clear/CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

Scheme 171

1. Move the auto-tensioner to remove tension from the drive belt, then remove the belt (see «DRIVE BELT INSPECTION»(/acura/mdx/ii-2006-2010/remont/charging-system/#charging-system) ).
2. Remove the crankshaft pulley (see «CRANKSHAFT PULLEY REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head__crankshaft-pulley-removal-and-installation) ).
3. Remove the upper and lower front covers from the engine (see «TIMING BELT INSPECTION»(/acura/mdx/ii-2006-2010/remont/mechanical/#cylinder-head) ).
4. Remove the CKP sensor (A) from the oil pump.
5. Install the parts in the reverse order of removal.
6. Do the CKP pattern clear/CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

Scheme 172

1. Remove the intake manifold (see «REMOVAL»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
2. Remove the injector rails and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/mdx/ii-2006-2010/remont/exhaust/#intake-manifold-and-exhaust-system) ).
3. Disconnect the knock sensor 1P connector (A), then remove the knock sensor (B).
4. Install the parts in the reverse order of removal.

PCM Update

Special Tools Required

1. Honda diagnostic system (HDS) tablet tester
2. Honda interface module (HIM) and an iN workstation with HDS and CM update software
3. HDS pocket tester
4. GNA600 and an iN workstation with HDS and CM update software

Note. Use this procedure when you need to update the PCM during troubleshooting procedures. Make sure the HDS is loaded with the latest software version. Before you update the PCM, make sure the battery in the vehicle is fully charged and connect a jumper battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to LOCK (0) or ACC (I) during the update. If there is a problem with the update, leave the ignition switch ON (II). To prevent PCM damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, door locks, etc.) during the update. To ensure the latest program is installed, do a PCM update whenever the PCM is substituted or replaced. You cannot update a PCM with a program it already has. It will only accept a new program. High temperature in the engine compartment might cause the PCM to become too hot to run the update. If the engine has been running before this procedure, open the hood and cool the engine compartment. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in ON (II) position when you disconnect the HIM from the data link connector (DLC). This prevents damage to the PCM. Turn the ignition switch to ON (II), but do not start the engine. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard. Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting(see DLC CIRCUIT TROUBLESHOOTING . If you are returning from the DLC circuit troubleshooting, skip steps 4 and 5 and clean the throttle body after updating the PCM. USA, Canada models: Select the INSPECTION MENU with the HDS. USA, Canada models: Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts. NOTE: USA, Canada models: If the TP POSITION CHECK indicates FAILED, continue this procedure. Exit the HDS (USA, Canada models), then select the update mode, and follow the screen prompts to update the PCM. If the software in the PCM is the latest, disconnect the HDS/HIM from the DLC, and go back to the procedure that you were doing. If the software in the PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both. NOTE: If the PCM update system requires you to cool the PCM, follow the instructions on screen. If you run into a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100 %, D or immobilizer indicator flashes, HDS tablet freezes, etc.), follow these steps to minimize the chance of damaging the PCM: Leave the ignition switch in ON (II) position. Connect a jumper battery (do not connect a battery charger). Shut down the HDS. Disconnect the HDS from the DLC. Reboot the HDS. Reconnect the HDS to the DLC, and try the update procedure again. USA, Canada models: If the TP POSITION CHECK failed in step 6, clean the throttle body(see THROTTLE BODY CLEANING . Do the PCM idle learn procedure.(see PCM IDLE LEARN PROCEDURE Do the CKP learn procedure.

PCM Replacement

Special Tools Required

1. Honda diagnostic system (HDS) tablet tester
2. Honda interface module (HIM) and an iN workstation with HDS and CM update software
3. HDS pocket tester
4. GNA600 and an iN workstation with HDS and CM update software

Note. Make sure the HDS is loaded with the latest software version. If you are replacing the PCM after substituting a known-good PCM, reinstall the original PCM, then do this procedure. USA, Canada models: During the procedure, if any READ DATA, WRITE DATA, or other data Checks fail, note the failure, then continue.

Scheme 173

Scheme 174

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch ON (II).
3. Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the «DLC circuit troubleshooting»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) (see ). If you are returning from DLC circuit troubleshooting, skip steps 4 through 9 , 18 through 23 , and 26 through 28 , and do this after replacing the PCM; USA, Canada models: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ). USA, Canada models: Replace the ATF (see «ATF REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/automatic-trans/#automatic-transmission) ). USA, Canada models: Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
4. USA, Canada models: Select the PGM-FI system with the HDS.
5. USA, Canada models: Select the INSPECTION MENU with the HDS.
6. USA, Canada models: Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts. NOTE: USA, Canada models: If the TP POSITION CHECK indicates FAILED, continue with this procedure.
7. USA, Canada models: Select the REPLACE PCM MENU, then select READ DATA and follow the screen prompts. NOTE: USA, Canada models: Doing this step copies (READS) the engine oil life data from the original PCM so you can later download (WRITES) it into the new PCM. USA, Canada models: If READ DATA indicates FAILED, continue with this procedure.
8. USA, Canada models: Select the A/T system with the HDS.
9. USA, Canada models: Select the REPLACE TCM/ PCM MENU, then select READ DATA and follow the screen prompts. NOTE: USA, Canada models: Doing this step copies (READS) the ATF life data from the original PCM so you can later download (WRITES) it into the new PCM. USA, Canada models: If READ DATA indicates FAILED, continue with this procedure.
10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Remove the bracket (D), then free the A/C discharge line (E) from the clip (F) and remove the A/C suction line mounting bracket bolt (G).
13. Remove the cover (H), then disconnect the PCM connectors A, B, and C. NOTE: PCM connectors A, B, and C have symbols (A=[], B=delta, C=o) embossed on them for identification.
14. Remove the bolts (I), then remove the PCM (J).
15. Install the parts in the reverse order of removal.
16. Turn the ignition switch ON (II).
17. USA, Canada models: Manually input the VIN to the PCM with the HDS. NOTE: USA, Canada models: DTC P0630 "VIN Not Programmed or Mismatch" may be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.
18. USA, Canada models: If the READ DATA (engine oil life) failed in step 7 , go to step 21 . Otherwise, go to step 19.
19. USA, Canada models: Select the PGM-FI system with the HDS.
20. USA, Canada models: Select the REPLACE PCM MENU, then select WRITE DATA and follow the screen prompts. NOTE: USA, Canada models: If the WRITE DATA indicates FAILED, continue with this procedure.
21. USA, Canada models: If the READ DATA (ATF life) failed in step 9 , go to step 24 . Otherwise go to step 22.
22. USA, Canada models: Select the A/T SYSTEM with the HDS.
23. USA, Canada models: Select the REPLACE TCM/ PCM MENU, then select WRITE DATA and follow the screen prompts. NOTE: USA, Canada models: If the WRITE DATA indicates FAILED, continue with this procedure.
24. Select IMMOBI system with the HDS.
25. Enter the immobilizer code with the PCM replacement procedure in the HDS; it allows you to start the engine.
26. USA, Canada models: If the TP POSITION CHECK failed in step 6 clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 27.
27. USA, Canada models: If the READ DATA failed in step 7 or the WRITE DATA failed in step 20 , replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/lubrication-system/#engine-lubrication) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 28.
28. USA, Canada models: If the READ DATA failed in step 9 or the WRITE DATA failed in step 21 , replace the ATF (see «ATF REPLACEMENT»(/acura/mdx/ii-2006-2010/remont/automatic-trans/#automatic-transmission) ), then go to step 29.
29. Select PGM-FI system and reset the PCM with the HDS.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
31. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#idle-control-system__pcm-idle-learn-procedure) ).
32. Do the CKP pattern learn procedure (see «CRANK (CKP) PATTERN CLEAR/CRANK (CKP) PATTERN LEARN»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• AIR CLEANER ELEMENT INSPECTION/ REPLACEMENT
• PCM IDLE LEARN PROCEDURE
• SUBSTITUTING THE PCM
• FAN MOTOR TEST
• CIRCUIT DIAGRAM
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• FUEL PRESSURE TEST
• FUEL PRESSURE REGULATOR REPLACEMENT
• VALVE CLEARANCE ADJUSTMENT
• SPARK PLUG INSPECTION
• VTEC ROCKER ARM TEST
• REMOVAL
• ENGINE COMPRESSION INSPECTION
• TIMING BELT DRIVE PULLEY REPLACEMENT
• CRANKSHAFT PULLEY REMOVAL AND INSTALLATION
• THROTTLE BODY REMOVAL/INSTALLATION
• THROTTLE BODY CLEANING
• ALTERNATOR REMOVAL AND INSTALLATION
• BATTERY TEST
• LEFT ENGINE COMPARTMENT WIRE HARNESS
• SH-AWD CONTROL UNIT REPLACEMENT
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• GAUGE CONTROL MODULE INPUT TEST
• GAUGE CONTROL MODULE REPLACEMENT
• SUBSTITUTE THE PCM
• SRS UNIT REPLACEMENT
• TPMS CONTROL UNIT REPLACEMENT
• YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT
• ACTIVE DAMPER CONTROL UNIT REPLACEMENT
• ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION
• STEERING ANGLE SENSOR CENTER POINT WRITING
• HOW TO USE THE HDS (HONDA DIAGNOSTIC SYSTEM)
• SELF-DIAGNOSTIC FUNCTION
• GENERAL TROUBLESHOOTING INFORMATION
• SYMPTOM TROUBLESHOOTING INFORMATION
• GENERAL TROUBLESHOOTING INFORMATION
• WITHOUT HDS (USE ONLY IF THE HDS IS UNAVAILABLE)
• UNDER-DASH FUSE/RELAY BOX
• ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION
• FUEL PRESSURE RELIEVING
• FUEL LINE/QUICK-CONNECT FITTING PRECAUTIONS
• TIMING BELT INSTALLATION
• ENGINE OIL REPLACEMENT
• ENGINE OIL FILTER REPLACEMENT
• MAF SENSOR/IAT SENSOR REPLACEMENT
• PCM UPDATE
• PCM REPLACEMENT
• A/F SENSOR REPLACEMENT
• SECONDARY HO2S REPLACEMENT
• DTC P0301, P0302, P0303, P0304, P0305, or P0306
• P0301, P0302, P0303, P0304, or P0305
• DTC P062F: PCM Internal Control Module Keep Alive Memory (KAM) Error
• DLC circuit troubleshooting
• F-CAN Circuit Troubleshooting (Part 1)