Electronic Throttle Control System Acura MDX II

Scheme 12

DTC P0122: TP Sensor A 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 13

Scheme 14

Scheme 15

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check TP SENSOR A in the DATA LIST with the HDS. Is there about 0.3 V or less? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
4. Check for Temporary DTCs or DTCs with the HDS. Are DTC P0122 and P0222 indicated at the same time? YES - Go to step 10 . NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the throttle body 6P connector.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector B (49P).
9. Check for continuity between throttle body 6P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the throttle body and the PCM (B17), then go to step 18 . NO - Go to step 23 .
10. Disconnect the throttle body 6P connector.
11. Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 16 . NO - Go to step 12.
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 PCM connector terminal B18 and throttle body 6P connector terminal No. 2. Is there continuity? YES - Go to step 23 . NO - Repair open in the wire between the throttle body and the PCM (B18), then go to step 18 .
16. Turn the ignition switch OFF.
17. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0123: TP Sensor A 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 16

Scheme 17

Scheme 18

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
4. Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES - Go to step 13 . NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the throttle body 6P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between throttle body 6P connector terminal No. 1 and body ground. Is there about 5 V? YES - Go to step 18 . NO - Go to step 9.
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 PCM connector terminal B17 and throttle body 6P connector terminal No. 1. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the throttle body and the PCM (B17), then go to step 20 .
13. Turn the ignition switch OFF.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (49P).
17. Check for continuity between PCM connector terminal B33 and throttle body 6P connector terminal No. 4. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the throttle body and the PCM (B33), then go to step 20 .
18. Turn the ignition switch OFF.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the PGM 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 P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0222: TP Sensor B 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 19

Scheme 20

Scheme 21

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check TP SENSOR B in the DATA LIST with the HDS. Is there about 0.3 V or less? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
4. Check for Temporary DTCs or DTCs with the HDS. Are DTC P0122 and P0222 indicated at the same time? YES - Go to step 10 . NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the throttle body 6P connector.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector B (49P).
9. Check for continuity between throttle body 6P connector terminal No. 3 and body ground. Is there continuity? YES - Repair short in the wire between the throttle body and the PCM (B26), then go to step 18 . NO - Go to step 23 .
10. Disconnect the throttle body 6P connector.
11. Measure voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES - Go to step 16 . NO - Go to step 12.
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 PCM connector terminal B18 and throttle body 6P connector terminal No. 2. Is there continuity? YES - Go to step 23 . NO - Repair open in the wire between the throttle body and the PCM (B18), then go to step 18 .
16. Turn the ignition switch OFF.
17. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0223: TP Sensor B 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 22

Scheme 23

Scheme 24

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check TP SENSOR B in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to step 4. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
4. Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES - Go to step 13 . NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the throttle body 6P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between throttle body 6P connector terminal No. 3 and body ground. Is there about 5 V? YES - Go to step 18 . NO - Go to step 9.
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 PCM connector terminal B26 and throttle body 6P connector terminal No. 3. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the throttle body and the PCM (B26), then go to step 20 .
13. Turn the ignition switch OFF.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (49P).
17. Check for continuity between PCM connector terminal B33 and throttle body 6P connector terminal No. 4. Is there continuity? YES - Go to step 25 . NO - Repair open in the wire between the throttle body and the PCM (B33), then go to step 20 .
18. Turn the ignition switch OFF.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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 P0223 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P0223 Indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P1658: ETCS Control Relay ON 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 25

Scheme 26

1. Turn the ignition switch ON (II).
2. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the RELAY circuit OK? YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the under-hood fuse/relay box (ETCS control relay) and the PCM. NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Test the ETCS control relay in the under-hood fuse/ relay box (see «POWER RELAY TEST»(/acura/mdx/ii-2006-2010/remont/body-electrical/#relays__power-relay-test) ). ETCS control relay OK? YES - Go to step 5. 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 14 .
5. Jump the SCS line with the HDS.
6. Disconnect PCM connector A (49P).
7. Disconnect the under-hood fuse/relay box connector E (14P).
8. Check for continuity between PCM connector terminal A29 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A29) and the under-hood fuse/relay box (ETCS control relay), then go to step 14 . NO - Go to step 9.
9. Disconnect PCM connector C (49P).
10. Disconnect the under-hood fuse/relay box connector H (9P).
11. Turn the ignition switch ON (II).
12. Measure voltage between PCM connector terminal C4 and body ground. Is there battery voltage? YES - Repair short to power in the wire between the PCM (C4) and the under-hood fuse/relay box (ETCS control relay), then go to step 13. NO - Go to step 19 .
13. Turn the ignition switch OFF.
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 P1658 indicated? YES - Check for poor connections or loose terminals at the under-hood fuse/relay box (ETCS control relay) 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.
19. Turn the ignition switch OFF.
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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1658 indicated? YES - Check for poor connections or loose terminals at the under-hood fuse/relay box (ETCS control relay) 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 P1659: ETCS Control Relay OFF 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 27

Scheme 28

Scheme 29

Scheme 30

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 P1659 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 under-hood fuse/relay box (ETCS control relay) and the PCM.
4. Turn the ignition switch OFF.
5. Check the No. 10 THROTTLE ACTUATOR CONTROL (DBW+) (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 6. NO - Go to step 14 .
6. Test the ETCS control relay 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 ETCS control relay OK? YES - Go to step 7. 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 .
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector C (49P).
9. Disconnect the under-hood fuse/relay box connector H (9P).
10. Check for continuity between under-hood fuse/ relay box connector H (9P) terminal No. 7 and PCM connector terminal C4. Is there continuity? YES - Go to step 11. NO - Repair open in the wire between the PCM (C4) and the under-hood fuse/relay box, then go to step 22 .
11. Disconnect PCM connector A (49P).
12. Disconnect under-hood fuse/relay box connector E (14P).
13. Check for continuity between under-hood fuse/ relay box connector E (14P) terminal No. 14 and PCM connector terminal A29. Is there continuity? YES - Go to step 27 . NO - Repair open in the wire between the PCM (A29) and the under-hood fuse/relay box, then go to step 22 .
14. Jump the SCS line with the HDS.
15. Disconnect PCM connector C (49P).
16. Disconnect the under-hood fuse/relay box connector H (9P).
17. Check for continuity between PCM connector terminal C4 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (C4) and the under-hood fuse/relay box, then go to step 22 . NO - Go to step 18.
18. Install the under-hood fuse/relay box connector H (9P), and replace the No. 10 THROTTLE ACTUATOR CONTROL (DBW+) fuse in the under-hood fuse/ relay box.
19. Turn the ignition switch ON (II).
20. Measure voltage between PCM connector terminal C4 and body ground. Is there battery voltage? YES - Go to step 27 . NO - Replace the right side engine compartment wire harness. Also replace the No. 10 THROTTLE ACTUATOR CONTROL (DBW+) fuse in the under-hood fuse/relay box, then go to step 21.
21. Turn the ignition switch OFF.
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 P1659 indicated? YES - Check for poor connections or loose terminals at the under-hood fuse/relay box 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 P1659 indicated? YES - Check for poor connections or loose terminals at the under-hood fuse/relay box 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 P1683: Throttle Valve Default Position Spring Performance Problem

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

Scheme 31

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. Turn the ignition switch OFF, and wait 10 seconds.
5. Turn the ignition switch ON (II).
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1683 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 throttle body and the PCM.
7. Turn the ignition switch OFF.
8. Disconnect the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
9. Push the throttle valve closed as shown.
10. Release the throttle valve. Does the throttle valve return? YES - 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 12 . NO - Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
12. Turn the ignition switch ON (II).
13. Reset the PCM with the HDS.
14. 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) ).
15. Turn the ignition switch OFF, and wait 10 seconds.
16. Turn the ignition switch ON (II).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1683 indicated? YES - If the throttle body was cleaned, go to step 11 . If the throttle body was replaced, check for poor connections or loose terminals at the throttle body 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 P1684: Throttle Valve Return Spring Performance Problem

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

Scheme 32

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. Turn the ignition switch OFF, and wait 10 seconds.
5. Turn the ignition switch ON (II).
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1684 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 throttle body and the PCM.
7. Turn the ignition switch OFF.
8. Disconnect the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
9. Push the throttle valve open as shown.
10. Release the throttle valve. Does the throttle valve return? YES - 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 12 . NO - Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
12. Turn the ignition switch ON (II).
13. Reset the PCM with the HDS.
14. 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) ).
15. Turn the ignition switch OFF, and wait 10 seconds.
16. Turn the ignition switch ON (II).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P1684 indicated? YES - If the throttle body was cleaned, go to step 11 . If the throttle body was replaced, check for poor connections or loose terminals at the throttle body 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 P2101: ETCS 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 33

Scheme 34

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Do the ETCS TEST in the INSPECTION MENU with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 indicated? YES - Go to step 7 . NO - Go to step 5.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS APP SENSOR A
6. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 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 throttle body and the PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
7. Turn the ignition switch OFF.
8. Disconnect the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
9. Turn the ignition switch ON (II).
10. Clear the DTC with the HDS.
11. Do the ETCS TEST in the INSPECTION MENU with the HDS.
12. Visually check the throttle valve operation. Does the throttle valve operate smoothly? YES - 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 22 and recheck. If DTC P2101 is indicated, go to step 19 . NO - Go to step 13
13. Turn the ignition switch OFF.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector C (49P).
17. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
18. Check for continuity between PCM connector terminals C2 and C3. Is there continuity? YES - Go to step 27 . NO - Repair open in the wires between the throttle body and the PCM (C2, C3), then go to step 21 .
19. Turn the ignition switch OFF.
20. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS APP SENSOR A
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body and the PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), and go to step 1 . NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to .
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 P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P2118: Throttle Actuator Current Range/ Performance Problem

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

Scheme 35

Scheme 36

1. Jump the SCS line with the HDS.
2. Disconnect PCM connector C (49P).
3. Measure resistance between PCM connector terminals C2 and C3. Is there about 1.0 ohms or less? YES - Go to step 4. NO - Go to step 15 .
4. Disconnect the throttle body 6P connector.
5. At the throttle body side, measure resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed. Is there about 1.0 ohms or less? YES - Go to step 6. NO - Repair short in the wires between the PCM C3 (ETCSM-line) and C4 (ETCSM+line), then go to step 7 .
6. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
7. Reconnect all connectors.
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. Turn the ignition switch OFF.
12. Turn the ignition switch ON (II).
13. Slowly press the accelerator pedal to the floor.
14. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body 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.
15. Reconnect all connectors.
16. 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) ).
17. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P2122: APP Sensor A (TP Sensor D) 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 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Turn the ignition switch ON (II).
2. Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0.2 V or less? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3. Is there about 5 V? YES - Go to step 7. NO - Go to step 17 .
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 APP sensor 6P connector terminal No. 1 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A18) and APP sensor A, then go to step 24 . NO - Go to step 11.
11. Connect APP sensor 6P connector terminal No. 1 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A18 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the PCM (A18) and APP sensor A, then go to step 24 .
13. Reconnect PCM connector A (49P).
14. Connect APP sensor 6P connector terminals No. 1 and No. 3 with a jumper wire.
15. Turn the ignition switch ON (II).
16. Check APP SENSOR A in the DATA LIST with the HDS. Is there about 0.2 V or less? YES - Go to step 29 . NO - Go to step 22 .
17. Turn the ignition switch OFF.
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector A (49P).
20. Connect APP sensor 6P connector terminal No. 3 to body ground with a jumper wire.
21. Check for continuity between PCM connector terminal A24 and body ground. Is there continuity? YES - Go to step 30 . NO - Repair open in the wire between the PCM (A24) and APP sensor A, then go to step 24 .
22. Turn the ignition switch OFF.
23. Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
24. Reconnect all connectors.
25. Turn the ignition switch ON (II).
26. Reset the PCM 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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2122 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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.
29. Turn the ignition switch OFF.
30. Reconnect all connectors.
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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2122 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2123: APP Sensor A (TP Sensor D) 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 44

Scheme 45

Scheme 46

1. Turn the ignition switch ON (II).
2. Check APP SENSOR A in the DATA LIST with the HDS. Is there about 4.9 V or more? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3. Is there about 5 V? YES - Go to step 12 . NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Connect APP sensor 6P connector terminal No. 2 to body ground with a jumper wire.
11. Check for continuity between PCM connector terminal A26 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the PCM (A26)and APP sensor A, then go to step 14 .
12. Turn the ignition switch OFF.
13. Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
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 P2123 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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.
19. Reconnect all connectors.
20. 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) ).
21. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2123 indicated? YES - Check for poor connections or loose terminals at APP sensor A 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 P2127: APP Sensor B (TP Sensor E) 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 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

1. Turn the ignition switch ON (II).
2. Check APP SENSOR B in the DATA LIST with the HDS. Is there about 0.2 V or less? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor B and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6. Is there about S V? YES - Go to step 7. NO - Go to step 17 .
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 APP sensor 6P connector terminal No. 4 and body ground. Is there continuity? YES - Repair short in the wire between the PCM (A19) and APP sensor B, then go to step 24 . NO - Go to step 11.
11. Connect APP sensor 6P connector terminal No. 4 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A19 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the PCM (A19) and APP sensor B, then go to step 24 .
13. Reconnect PCM connector A (49P).
14. Connect APP sensor 6P connector terminals No. 4 and No. 6 with a jumper wire.
15. Turn the ignition switch ON (II).
16. Check APP SENSOR B in the DATA LIST with the HDS. Is there about 0.2 V or less? YES - Go to step 29 . NO - Go to step 22 .
17. Turn the ignition switch OFF.
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector A (49P).
20. Connect APP sensor 6P connector terminal No. 6 to body ground with a jumper wire.
21. Check for continuity between PCM connector terminal A25 and body ground. Is there continuity? YES - Go to step 30 . NO - Repair open in the wire between the PCM (A25) and APP sensor B, then go to step 24 .
22. Turn the ignition switch OFF.
23. Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
24. Reconnect all connectors.
25. Turn the ignition switch ON (II).
26. Reset the PCM 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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2127 indicated? YES - Check for poor connections or loose terminals at APP sensor 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.
29. Turn the ignition switch OFF.
30. Reconnect all connectors.
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. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2127 indicated? YES - Check for poor connections or loose terminals at APP sensor 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 P2128: APP Sensor B (TP Sensor E) 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 54

Scheme 55

Scheme 56

1. Turn the ignition switch ON (II).
2. Check APP SENSOR B in the DATA LIST with the HDS. Is there about 4.0 V or more? YES - Go to step 3. NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals APP sensor B and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6. Is there about 5 V? YES - Go to step 12 . NO - Go to step 7.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Connect APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.
11. Check for continuity between PCM connector terminal A27 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the PCM (A27) and APP sensor B, then go to step 14 .
12. Turn the ignition switch OFF.
13. Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
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 P2128 indicated? YES - Check for poor connections or loose terminals at APP sensor 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.
19. Reconnect all connectors.
20. 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) ).
21. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2128 indicated? YES - Check for poor connections or loose terminals at APP sensor 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 P2135: TP Sensor A/B Voltage Incorrect Correlation

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

Scheme 57

Scheme 58

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Do the ETCS TEST in the INSPECTION MENU with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2135 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 throttle body and the PCM.
5. Turn the ignition switch OFF.
6. Disconnect the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
7. Turn the ignition switch ON (II).
8. Visually check the throttle valve operation while you clear the DTC with the HDS. Does the valve temporarily move to the fully closed position? YES - Go to step 15 . NO - Go to step 9.
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 PCM connector terminals B17 and B26. Is there continuity? YES - Go to step 13. NO - Go to step 22 .
13. Disconnect the throttle body 6P connector.
14. Check for continuity between PCM connector terminals B17 and B26. Is there continuity? YES - Repair short in the wire between the PCM B17 (TPSA line) and the B26 (TPSB line), then go to step 17 . NO - Go to step 15.
15. Turn the ignition switch OFF.
16. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
17. Reconnect all connectors.
18. Turn the ignition switch ON (II).
19. Reset the PCM with the HDS.
20. 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) ).
21. Identifying for Temporary DTCs or DTCs with the HDS. Is DTC P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body 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.
22. Reconnect all connectors.
23. 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) ).
24. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P2138: APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation

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

Scheme 59

Scheme 60

1. Turn the ignition switch ON (II).
2. Clear the DTC with HDS.
3. Press the accelerator pedal to the floor.
4. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 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 APP sensor and the PCM.
5. Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS. Are they the same voltage? YES - Go to step 6. NO - Go to step 12 .
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector A (49P).
9. Check for continuity between PCM connector terminals A18 and A19. Is there continuity? YES - Go to step 10. NO - Go to step 22 .
10. Disconnect the APP sensor 6P connector.
11. Check for continuity between PCM connector terminals A18 and A19. Is there continuity? YES - Repair short in the wires between PCM connector terminals A18 (APSA line) and A19 (APSB line), then go to step 14 . NO - Go to step 13 .
12. Turn the ignition switch OFF.
13. Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ).
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. Turn the ignition switch OFF.
19. Turn the ignition switch ON (II).
20. Press the accelerator pedal to the floor.
21. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at APP 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.
22. Reconnect all connectors.
23. 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) ).
24. Turn the ignition switch OFF.
25. Turn the ignition switch ON (II).
26. Press the accelerator pedal to the floor.
27. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at APP 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 go to step 24 . |f 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 P2176: Throttle Actuator Control System Idle Position Not Learned

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 P2135 is stored at the same time as DTC P2176, troubleshoot DTC P2135 first, then recheck for DTC P2176.

Scheme 61

Scheme 62

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II), and wait 10 seconds.
5. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2176 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 throttle body and the PCM, then clean the throttle body (see «THROTTLE BODY TEST»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system) .
6. Turn the ignition switch OFF.
7. Disconnect the intake air duct from the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
8. Turn the ignition switch ON (II).
9. Clear the DTC with the HDS.
10. Visually check the throttle valve operation while doing the ETCS TEST in the INSPECTION MENU with the HDS. Does the throttle valve move to its fully closed position? YES - Go to step 11. NO - Go to step 12 .
11. Check for sludge or carbon on the throttle valve. Is there sludge or carbon on the throttle valve? YES - 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 21 . NO - Go to step 18 .
12. Turn the ignition switch OFF.
13. Disconnect the throttle body 6P connector.
14. Jump the SCS line with the HDS.
15. Disconnect PCM connector C (49P).
16. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
17. Check for continuity between PCM connector terminals C2 and C3. Is there continuity? YES - Go to step 27 . NO - Repair open in the wires between the throttle body and the PCM (C2, C3), then go to step 20 .
18. Turn the ignition switch OFF.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
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. Turn the ignition switch OFF.
25. Turn the ignition switch ON (II), and wait 10 seconds.
26. Check for Temporary DTCs or DTCs with the HDS. Is DTC P2176 indicated? YES - Check for poor connections or loose terminals at the throttle body 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 P2176 indicated? YES - Check for poor connections or loose terminals at the throttle body 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.

APP Sensor Signal Inspection

Note. This procedure checks the APP sensor in its fully closed position. In any other position, the APP sensor stores DTCs which are covered in other troubleshooting procedures. Check for Temporary DTCs or DTCs with the HDS before doing this procedure. If any DTCs are indicated, troubleshoot them first, then do this procedure. Press the accelerator pedal several times to check its operation. If it does not operate smoothly, check the pedal. If you find a problem, replace the accelerator pedal module (see ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION ).

Scheme 63

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. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/mdx/ii-2006-2010/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0%, the APP sensor is OK. If it is not 0%, 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 go to step 5.
5. Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0%, the APP sensor is OK. If it is not 0%, replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/mdx/ii-2006-2010/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 64

1. Disconnect the accelerator pedal position (APP) sensor 6P connector (A).
2. Remove the accelerator pedal module (B). NOTE: The APP sensor is not available separately. Do not disassemble the accelerator pedal module.
3. Install the parts in the reverse order of removal.

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• THROTTLE BODY REMOVAL/INSTALLATION
• PCM IDLE LEARN PROCEDURE
• PCM UPDATE
• SUBSTITUTING THE PCM
• PCM REPLACEMENT
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• THROTTLE BODY CLEANING
• THROTTLE BODY TEST
• DLC CIRCUIT TROUBLESHOOTING
• ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION