Electronic Throttle Control System Acura TL IV рестайлинг

Scheme 20

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 21

Scheme 22

Scheme 23

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 ECM/PCM.
4. Check for Pending or Confirmed 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the throttle body 6P connector.
7. Jump the SCS line with the HDS.
8. Disconnect ECM/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 ECM/PCM (B17), then go to step 18 . NO - Go to step 23 .
10. Measure the 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 11.
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector B (49P).
14. Disconnect the throttle body 6P connector.
15. Check for continuity between ECM/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 ECM/PCM (B18), then go to step 18 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0122 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 24

Scheme 25

Scheme 26

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 ECM/PCM.
4. Check for Pending or Confirmed 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the throttle body 6P connector.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Measure the 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector B (49P).
12. Check for continuity between ECM/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 ECM/PCM (B17), then go to step 20 .
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector B (49P).
17. Check for continuity between ECM/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 ECM/PCM (B33), then go to step 20 .
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0123 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 27

Scheme 28

Scheme 29

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 ECM/PCM.
4. Check for Pending or Confirmed 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the throttle body 6P connector.
7. Jump the SCS line with the HDS.
8. Disconnect ECM/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 ECM/PCM (B26), then go to step 18 . NO - Go to step 23 .
10. Measure the 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 11.
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector B (49P).
14. Disconnect the throttle body 6P connector.
15. Check for continuity between ECM/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 ECM/PCM (B18), then go to step 18 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0222 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 30

Scheme 31

Scheme 32

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 ECM/PCM.
4. Check for Pending or Confirmed 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the throttle body 6P connector.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Measure the 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector B (49P).
12. Check for continuity between ECM/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 ECM/PCM (B26), then go to step 20 .
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector B (49P).
17. Check for continuity between ECM/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 ECM/PCM (B33), then go to step 20 .
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0223 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0223 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 33

Scheme 34

Scheme 35

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 ETCS control relay and the ECM/PCM. • NO - Go to step 3.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Remove the ETCS control relay (A) from the under-hood fuse/relay box.
5. Test the ETCS control relay (see «POWER RELAY TEST»(/acura/tl/iv-2011-2014/remont/body-electrical/#relays__power-relay-test) ). Is the ETCS control relay OK? YES - Go to step 6. NO - Replace the ETCS control relay, then go to step 13 .
6. Jump the SCS line with the HDS.
7. Disconnect ECM/PCM connector A (49P).
8. Check for continuity between ECM/PCM connector terminal A29 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A29) and the ETCS control relay, then go to step 13 . NO - Go to step 9.
9. Disconnect ECM/PCM connector C (49P).
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Measure the voltage between ECM/PCM connector terminal C4 and body ground. Is there battery voltage? YES - Repair short to power in the wire between the ECM/PCM (C4) and the ETCS control relay, then go to step 12. NO - Go to step 18 .
12. Turn the ignition switch to LOCK(0), or press the engine start/stop button to select the OFF mode.
13. Reconnect ail connectors.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Reset the ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1658 indicated? YES - Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Reconnect all connectors.
20. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1658 indicated? YES - Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed 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 ETCS control relay and the ECM/PCM.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Check the No. 18 DBW (ETCS) (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES - Go to step 6. NO - Go to step 17 .
6. Remove the ETCS control relay (A) from the under-hood fuse/relay box.
7. Test the ETCS control relay (see «POWER RELAY TEST»(/acura/tl/iv-2011-2014/remont/body-electrical/#relays__power-relay-test) ). Is the ETCS control relay OK? YES - Go to step 8. NO - Replace the ETCS control relay, then go to step 23 .
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the voltage between ETCS control relay 4P connector terminal No. 4 and body ground. Is there battery voltage? YES - Go to step 10. NO - Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ), then go to step 22 .
10. Measure the voltage between ETCS control relay 4P connector terminal No. 1 and body ground. Is there battery voltage? YES - Go to step 11. NO - Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ), then go to step 22 .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector C (49P).
14. Check for continuity between ETCS control relay 4P connector terminal No. 2 and ECM/PCM connector terminal C4. Is there continuity? YES - Go to step 15. NO - Repair open in the wire between the ECM/PCM (C4) and the ETCS control relay, then go to step 23 .
15. Disconnect ECM/PCM connector A (49P).
16. Check for continuity between ETCS control relay 4P connector terminal No. 3 and ECM/PCM connector terminal A29. Is there continuity? YES - Go to step 28 . NO - Repair open in the wire between the ECM/PCM (A29) and the ETCS control relay, then go to step 23 .
17. Remove the ETCS control relay (A) from the under-hood fuse/relay box.
18. Jump the SCS line with the HDS.
19. Disconnect ECM/PCM connector C (49P).
20. Check for continuity between ECM/PCM connector terminal C4 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (C4) and the ETCS control relay, then go to step 23 . NO - Go to step 21.
21. Check for continuity between ETCS control relay 4P connector terminal No. 1 and body ground. Is there continuity? YES - Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2011-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ), then go to step 23 . NO - Go to step 28 .
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1659 indicated? YES - Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
28. Reconnect all connectors.
29. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
30. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1659 indicated? YES - Check for poor connections or loose terminals at the ETCS control relay and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 44

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check for Pending or Confirmed 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 ECM/PCM.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect the intake air duct from the throttle body.
9. Push the throttle valve closed as shown in illustration below.
10. Release the throttle valve. Does the throttle valve return? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 12 and recheck. If DTC P1683 is indicated, go to step 11. NO - Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Reset the ECM/PCM with the HDS.
14. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1683 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 45

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check for Pending or Confirmed 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 ECM/PCM.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect the intake air duct from the throttle body.
9. Push the throttle valve open as shown in illustration below.
10. Release the throttle valve. Does the throttle valve return? YES - Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 12 and recheck. If DTC P1684 is indicated, go to step 11. NO - Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Reset the ECM/PCM with the HDS.
14. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, and wait 10 seconds.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1684 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 46

Scheme 47

Scheme 48

Scheme 49

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the ETCS TEST in the INSPECTION MENU with the HDS.
4. Check for Pending or Confirmed 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 VEHICLE SPEED APP SENSOR
6. Check for Pending or Confirmed 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 at the ECM/PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Disconnect the intake air duct from the throttle body.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 24 and recheck. If DTC P2101 is indicated, go to step 22 . NO - Go to step 13.
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Disconnect the throttle body 6P connector.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector B (49P).
17. Check for continuity between ECM/PCM connector terminal B33 and throttle body 6P connector terminal No. 4. Is there continuity? YES - Go to step 18. NO - Repair open in the wire between the throttle body and the ECM/PCM (B33), then go to step 24 .
18. Disconnect ECM/PCM connector C (49P).
19. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
20. Check for continuity between ECM/PCM connector terminals C2 and C3. Is there continuity? YES - Go to step 21. NO - Repair open in the wires between the throttle body and the ECM/PCM (C2, C3), then go to step 24 .
21. At the throttle body side, measure the resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle fully closed. Is there about 1.0 kohms or more? YES - Go to step 23 . NO - Go to step 30 .
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
28. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED APP SENSOR
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), and go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
30. Reconnect all connectors.
31. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
32. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED APP SENSOR
33. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2101 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ). If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 32 . If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Slowly press the accelerator pedal to the floor.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2118 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the throttle body 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between ECM/PCM connector terminal B33 and throttle body 6P connector terminal No. 4. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between the throttle body and the ECM/PCM (B33), then go to step 18 .
10. Disconnect ECM/PCM connector C (49P).
11. Check for continuity between throttle body 6P connector terminals No. 5 and No. 6. Is there continuity? YES - Repair short in the wires between throttle body 6P connector terminal No. 5 (ETCS- line) and No. 6 (ETCS+ line), then go to step 18 . NO - Go to step 12.
12. Check for continuity between body ground and throttle body 6P connector terminals No. 5 and No. 6 individually. Is there continuity? YES - Repair short in the wire between the throttle body 6P connector and body ground, then go to step 18 . NO - Go to step 13.
13. At the throttle body side, measure the 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 14. NO - Go to step 17 .
14. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
15. Check for continuity between ECM/PCM connector terminals C2 and C3. Is there continuity? YES - Go to step 16. NO - Repair open in the wire between the throttle body and the ECM/PCM (C2, C3), then go to step 18 .
16. At the throttle body side, check for continuity between body ground and throttle body 6P connector terminals No. 5 and No. 6 individually. Is there continuity? YES - Go to step 17. NO - Go to step 26 .
17. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Slowly press the accelerator pedal to the floor.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
26. Reconnect all connectors.
27. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
28. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
29. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
30. Slowly press the accelerator pedal to the floor.
31. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2118 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 . If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 57

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 the APP sensor and the ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/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 APP sensor and the ECM/PCM (A18), 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 ECM/PCM connector terminal A18 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the APP sensor and the ECM/PCM (A18), then go to step 24 .
13. Reconnect ECM/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 to ON (II), or press the engine start/stop button to select the ON mode.
16. Check APP SENSOR A in the DATA LIST with the HDS. Is there 0.2 V or less? YES - Go to step 29 . NO - Go to step 22 .
17. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
18. Jump the SCS line with the HDS.
19. Disconnect ECM/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 ECM/PCM connector terminal A24 and body ground. Is there continuity? YES - Go to step 29 . NO - Repair open in the wire between the APP sensor and the ECM/PCM (A24), then go to step 24 .
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ).
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
28. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2122 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
30. Reconnect all connectors.
31. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2122 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 64

Scheme 65

Scheme 66

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 the APP sensor and the ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/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 ECM/PCM connector terminal A26 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the APP sensor and the ECM/PCM (A26), then go to step 14 .
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2123 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
19. Reconnect all connectors.
20. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2123 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 67

Scheme 68

Scheme 69

Scheme 70

Scheme 71

Scheme 72

Scheme 73

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 the APP sensor and the ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the voltage between APP sensor 6P connector terminals No. 5 and No. 6. Is there about 5 V? YES - Go to step 7. NO - Go to step 17 .
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/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 APP sensor and the ECM/PCM (A19), 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 ECM/PCM connector terminal A19 and body ground. Is there continuity? YES - Go to step 13. NO - Repair open in the wire between the APP sensor and the ECM/PCM (A19), then go to step 24 .
13. Reconnect ECM/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 to ON (II), or press the engine start/stop button to select the ON mode.
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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
18. Jump the SCS line with the HDS.
19. Disconnect ECM/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 ECM/PCM connector terminal A25 and body ground. Is there continuity? YES - Go to step 30 . NO - Repair open in the wire between the APP sensor and the ECM/PCM (A25), then go to step 24 .
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ).
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
28. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2127 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
30. Reconnect all connectors.
31. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2127 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 74

Scheme 75

Scheme 76

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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 at the APP sensor and the ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the 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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/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 ECM/PCM connector terminal A27 and body ground. Is there continuity? YES - Go to step 19 . NO - Repair open in the wire between the APP sensor and the ECM/PCM (A27), then go to step 14 .
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2128 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
19. Reconnect all connectors.
20. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2128 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2135: TP Sensor A/B 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 77

Scheme 78

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Do the ETCS TEST in the INSPECTION MENU with the HDS.
4. Check for Pending or Confirmed 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the intake air duct from the throttle body.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Visually check the throttle valve operation while you clear the DTC with the HDS. Does the valve temporarily move to its fully closed position? YES - Go to step 15 . NO - Go to step 9.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector B (49P).
12. Check for continuity between ECM/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 ECM/PCM connector terminals B17 and B26. Is there continuity? YES - Repair short in the wires between the ECM/PCM connector terminals B17 (TPSA line) and B26 (TPSB line), then go to step 17 . NO - Go to step 15.
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
17. Reconnect all connectors.
18. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
19. Reset the ECM/PCM with the HDS.
20. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
22. Reconnect all connectors.
23. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2135 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 79

Scheme 80

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with HDS.
3. Press the accelerator pedal to the floor.
4. Check for Pending or Confirmed 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 ECM/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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM connector A (49P).
9. Check for continuity between ECM/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 ECM/PCM connector terminals A18 and A19. Is there continuity? YES - Repair short in the wires between ECM/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 to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Replace the accelerator pedal module (see «Accelerator Pedal Module Removal and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Press the accelerator pedal to the floor.
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
22. Reconnect all connectors.
23. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
24. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Press the accelerator pedal to the floor.
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2138 indicated? YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 24 . If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 81

Scheme 82

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds.
5. Check for Pending or Confirmed 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 ECM/PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ).
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the intake air duct from the throttle body.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), then go to step 21 . NO - Go to step 18 .
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Disconnect the throttle body 6P connector.
14. Jump the SCS line with the HDS.
15. Disconnect ECM/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 ECM/PCM connector terminals C2 and C3. Is there continuity? YES - Go to step 28 . NO - Repair open in the wires between the throttle body and the ECM/PCM (C2, C3), then go to step 21 .
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#idle-control-system__ecmpcm-idle-learn-procedure) ).
24. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds.
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2176 indicated? YES - Check for poor connections or loose terminals at the throttle body and the ECM/PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2011-2014/remont/mechanical/#intake-air-system__throttle-body-cleaning) ), and go to step 1 . NO - Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
27. Reconnect all connectors.
28. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
30. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 10 seconds.
31. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2176 indicated? YES - Check for poor connections or loose terminals at throttle body and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 29 . If the ECM/PCM was substituted, go to step 1 . NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's 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 Pending or Confirmed 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 and Installation ).

Scheme 83

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 to ON (II), or press the engine start/stop button to select the ON mode.
3. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2011-2014/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2011-2014/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 and Installation»(/acura/tl/iv-2011-2014/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 84

1. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2011-2014/remont/gauges-instrument-panels/#dashboard) ).
2. Disconnect the APP sensor 6P connector (A).
3. Remove the two mounting nuts (B), then remove the clip (C). Using a flat-tip screwdriver (D), push the lock (E), then remove the accelerator pedal pad (F) from the pedal stop (G).
4. Remove the accelerator pedal module.

Note. The APP sensor is not available separately. Do not disassemble the accelerator pedal module. If the pedal stop is damaged, replace it by pulling back the carpet (A), and removing the nuts (B), the bolt (C), and the pedal stop (D).

Scheme 85

Scheme 86

Scheme 87

1. Install the accelerator pedal pad (A) to the pedal stop (B). Slide the pad until it locks with a clicking sound.
2. Install a new clip (A). NOTE: The clip must be replaced whenever the accelerator pedal module is installed. Make sure that the accelerator pedal module and the clip are secure.
3. Install the nuts (B), and connect the APP sensor 6P connector (C).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• THROTTLE BODY REMOVAL/INSTALLATION
• ECM/PCM IDLE LEARN PROCEDURE
• ECM/PCM UPDATE
• SUBSTITUTING THE ECM/PCM
• ECM/PCM REPLACEMENT
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• THROTTLE BODY CLEANING
• DLC CIRCUIT TROUBLESHOOTING
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• Accelerator Pedal Module Removal and Installation