Electronic Throttle Control System Acura TL IV

Scheme 34

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 35

Scheme 36

Scheme 37

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
4. Check for Pending or Confirmed DTCs with the HDS
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 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. 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 PCM connector B (49P)
14. Disconnect the throttle body 6P connector
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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
22. Check for Pending or Confirmed DTCs with the HDS
23. Reconnect all connectors
24. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 38

Scheme 39

Scheme 40

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
4. Check for Pending or Confirmed DTCs with the HDS
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 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 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 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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
24. Check for Pending or Confirmed DTCs with the HDS
25. Reconnect all connectors
26. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 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 TP SENSOR B in the DATA LIST with the HDS
4. Check for Pending or Confirmed DTCs with the HDS
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 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. 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 PCM connector B (49P)
14. Disconnect the throttle body 6P connector
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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
22. Check for Pending or Confirmed DTCs with the HDS
23. Reconnect all connectors
24. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM, then go to step 1 If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 44

Scheme 45

Scheme 46

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
4. Check for Pending or Confirmed DTCs with the HDS
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 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 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 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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
24. Check for Pending or Confirmed DTCs with the HDS
25. Reconnect all connectors
26. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 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. Do the ETCS TEST in the INSPECTION MENU with the HDS
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-2008-2011/remont/body-electrical/#relays__power-relay-test) )
6. Jump the SCS line with the HDS
7. Disconnect PCM connector A (49P)
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 ETCS control relay, then go to step 13 NO -Go to step 9
9. Disconnect 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 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 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 all connectors
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
15. Reset the PCM with the HDS
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
17. Check for Pending or Confirmed DTCs with the HDS
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 PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

Scheme 57

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
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 (THROTTLE ACTUATOR CONTROL) (15 A) fuse in the under-hood fuse/relay box
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-2008-2011/remont/body-electrical/#relays__power-relay-test) )
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-2008-2011/remont/body-electrical/#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-2008-2011/remont/body-electrical/#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 PCM connector C (49P)
14. Check for continuity between ETCS control relay 4P connector terminal No 2 and PCM connector terminal C4 Is there continuity? YES -Go to step 15 NO -Repair open in the wire between the PCM (C4) and the ETCS control relay, then go to step 23
15. Disconnect PCM connector A (49P).
16. Check for continuity between ETCS control relay 4P connector terminal No 3 and PCM connector terminal A29 Is there continuity? YES -Go to step 28 NO -Repair open in the wire between the 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 PCM connector C (49P)
20. 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 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-2008-2011/remont/body-electrical/#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 PCM with the HDS
26. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
27. Check for Pending or Confirmed DTCs with the HDS
28. Reconnect all connectors
29. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 58

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 (in P or N) 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
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
10. Release the throttle valve
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
14. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-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 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 59

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 4th) 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
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
10. Release the throttle valve
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
14. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-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 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 60

Scheme 61

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Scheme 63

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
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters ENGINE SPEED VSS APP SENSOR
6. Check for Pending or Confirmed DTCs with the HDS
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
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 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 18. NO -Repair open in the wire between the throttle body and the PCM (B33), then go to step 24
18. Disconnect 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 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 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 k ohms 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters ENGINE SPEED VSS APP SENSOR
29. Check for Pending or Confirmed DTCs with the HDS
30. Reconnect all connectors
31. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 VSS 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 PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ) If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 32 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 64

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

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
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 PCM connector B (49P)
9. Check for continuity between 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 PCM (B33), then go to step 18
10. Disconnect 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 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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-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
26. Reconnect all connectors
27. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 71

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

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
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 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 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 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 PCM (A18), 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 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
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 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 29 NO -Repair open in the wire between the APP sensor and the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Check for Pending or Confirmed DTCs with the HDS
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 PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 78

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. Check APP SENSOR A in the DATA LIST with the HDS
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 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 APP sensor and the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
18. Check for Pending or Confirmed DTCs with the HDS
19. Reconnect all connectors
20. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM, then go to step 1 If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 81

Scheme 82

Scheme 83

Scheme 84

Scheme 85

Scheme 86

Scheme 87

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
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 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 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 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 PCM (A19), 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 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
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 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 APP sensor and the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
28. Check for Pending or Confirmed DTCs with the HDS
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 PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM, then go to step 1 If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 88

Scheme 89

Scheme 90

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
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 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 APP sensor and the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
18. Check for Pending or Confirmed DTCs with the HDS
19. Reconnect all connectors
20. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 91

Scheme 92

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
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
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 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 wires between the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
20. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
21. Check for Pending or Confirmed DTCs with the HDS
22. Reconnect all connectors
23. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 93

Scheme 94

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
5. Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS
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 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 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-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
22. Reconnect all connectors
23. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 24 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 «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 95

Scheme 96

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
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 performing the ETCS TEST in the INSPECTION MENU with the HDS
11. Check for sludge or carbon on the throttle valve
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 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 28 NO -Repair open in the wires between the throttle body and the 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-2008-2011/remont/testing-diagnostics/#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 PCM with the HDS
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-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
27. Reconnect all connectors
28. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 PCM If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 29 If the PCM was substituted, go to step 1 NO -If the PCM was updated, troubleshooting is complete If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/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 97

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 PCM If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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

1. If it is 0 %, the APP sensor is OK
2. If it is not 0 %, replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#electronic-throttle-control-system) ), then go to step 1

Scheme 98

Scheme 99

1. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 100

Scheme 101

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
• 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