Electronic Throttle Control System Acura ZDX I

Scheme 1

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 2

Scheme 3

Scheme 4

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 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 PCM connector B (49P).
9. Check for continuity between throttle body 6P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between the throttle body and the PCM (B17), then go to step 20 . NO -Go to step 25 .
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Disconnect the throttle body 6P connector.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Measure the voltage between throttle body 6P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 18 . NO -Go to step 14.
14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (49P).
17. Check for continuity between PCM connector terminal B18 and throttle body 6P connector terminal No. 2. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the throttle body and the PCM (B18), 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. 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, 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. 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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 5

Scheme 6

Scheme 7

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 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 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 an 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 an 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 8

Scheme 9

Scheme 10

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 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 PCM connector B (49P).
9. Check for continuity between throttle body 6P connector terminal No. 3 and body ground. Is there continuity? YES -Repair a short in the wire between the throttle body and the PCM (B26), then go to step 18 . NO -Go to step 23 .
10. Disconnect the throttle body 6P connector.
11. Measure 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 12.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (49P).
15. Check for continuity between PCM connector terminal B18 and throttle body 6P connector terminal No. 2. Is there continuity? YES -Go to step 23 . NO -Repair an 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 11

Scheme 12

Scheme 13

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 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 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 an 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 an 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 14

Scheme 15

Scheme 16

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 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/zdx/i-2009-2013/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 PCM connector A (49P).
8. Check for continuity between PCM connector terminal A29 and body ground. Is there continuity? YES -Repair a 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 a 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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
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 «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

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 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/zdx/i-2009-2013/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 arid body ground. Is there battery voltage? YES -Go to step 10. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/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/zdx/i-2009-2013/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 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 an 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 an 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 a 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/zdx/i-2009-2013/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 PCM with the HDS.
26. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
28. Reconnect all connectors.
29. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step. NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 25

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. Is DTC P1683 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
7. Turn the ignition switch 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.
10. Release the throttle valve. Does the throttle valve return? YES -Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-cleaning) ), then go to step 12 and recheck. If DTC P1683 is still indicated, go to step 11. NO -Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 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. 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. Is DTC P1684 Indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM.
7. Turn the ignition switch 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.
10. Release the throttle valve. Does the throttle valve return? YES -Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-cleaning) ), then go to step 12 and recheck. If DTC P1684 is still indicated, go to step 11. NO -Go to step 11.
11. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 27

Scheme 28

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 VECHICLE 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 the PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-cleaning) ), then go to step 22 and recheck. If DTC P2101 is indicated, go to step 19 . NO -Go to step 13.
13. Turn the ignition switch 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 C (49P).
17. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
18. Check for continuity between PCM connector terminals C2 and C3. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wires between the throttle body and the PCM (C2, C3), then go to step 21 .
19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
20. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ).
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VECHICLE SPEED APP SENSOR
26. 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VECHICLE SPEED APP SENSOR
30. 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. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 29

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. 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 PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-cleaning) ).
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 an open in the wire between the throttle body and the PCM (B33), then go to step 15 .
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 a short in the wires between throttle body 6P connector terminals No. 5 (ETCS- line) and No. 6 (ETCS+ line), then go to step 15 . 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 a short in the wire between the throttle body 6P connector and body ground, then go to step 15 . 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 1.2-1.0 kohms? YES -Go to step 14. NO -Go to step 23 .
14. Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Slowly press the accelerator pedal to the floor.
22. 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, 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
26. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
27. Slowly press the accelerator pedal to the floor.
28. 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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

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 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. 1 and No. 2. 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. 3 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A18) and the APP sensor, then go to step 24 . NO -Go to step 11.
11. Connect APP sensor 6P connector terminal No. 3 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 an open in the wire between the PCM (A18) and the APP sensor, 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. 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 PCM connector A (49P).
20. Connect APP sensor 6P connector terminal No. 1 to body ground with a jumper wire.
21. Check for continuity between PCM connector terminal A24 and body ground. Is there continuity? YES -Go to step 30 . NO -Repair an open in the wire between the PCM (A24) and the APP sensor, 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/INSTALLATION»(/acura/zdx/i-2009-2013/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 PCM with the HDS.
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
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 «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 40

Scheme 41

Scheme 42

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 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. 1 and No. 2. 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 an open in the wire between the PCM (A26) and the APP sensor, 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/INSTALLATION»(/acura/zdx/i-2009-2013/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 PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
19. Reconnect all connectors.
20. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 43

Scheme 44

Scheme 45

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. 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 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. 4 and No. 5. 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. 6 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A19) and the APP sensor, then go to step 24 . NO -Go to step 11.
11. Connect APP sensor 6P connector terminal No. 6 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 an open in the wire between the PCM (A19) and the APP sensor, 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. 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 PCM connector A (49P).
20. Connect APP sensor 6P connector terminal No. 4 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 an open in the wire between the PCM (A25) and the APP sensor, 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/INSTALLATION»(/acura/zdx/i-2009-2013/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 PCM with the HDS.
27. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
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 «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__how-to-troubleshoot-circuits-at-the) ).
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. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 50

Scheme 51

Scheme 52

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 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. 4 and No. 5. 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 an open in the wire between the PCM (A27) and the APP sensor, 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/INSTALLATION»(/acura/zdx/i-2009-2013/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 PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
19. Reconnect all connectors.
20. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

DTC P2135: TP Sensor A/B Voltage Incorrect Correlation

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

Scheme 53

Scheme 54

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 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 the 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 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 a short in the wire between 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-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 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
22. Reconnect all connectors.
23. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 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 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 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 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 a 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/INSTALLATION»(/acura/zdx/i-2009-2013/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 PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/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. Is DTC P2138 indicated? YES -Check for poor connections or loose terminals at the APP sensor 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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
22. Reconnect all connectors.
23. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), 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 «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

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 57

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. 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 PCM, then clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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 PCM connector C (49P).
16. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire.
17. Check for continuity between PCM connector terminals C2 and C3. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wires between the throttle body and the PCM (C2, C3), 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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/zdx/i-2009-2013/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. Is DTC P2176 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/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-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»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
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 the throttle body and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) .

Throttle Body Test

Note. If the malfunction indicator lamp (MIL) has been reported on, check for diagnostic trouble codes (DTCs).

Scheme 59

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/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. 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.
5. Check the REL TP SENSOR in the DATA LIST with the HDS. The reading should be below 2.46 percent. If it is not, clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-cleaning) ).

Throttle Body Cleaning

Scheme 60

Scheme 61

1. Make sure the ignition switch turned LOCK (0) or the engine start/stop button to select the OFF mode.
2. Check for damage to the air cleaner. If the air cleaner is damaged, replace it (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Remove the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ).
4. Clean off the carbon from the throttle valve and inside the throttle body with a paper towel soaked in throttle plate cleaner. NOTE: Remove the throttle body to clean it. Be careful not to pinch your fingers. To avoid removing the molybdenum coating, do not clean the bearing area of the throttle shaft (A). Do not spray throttle plate cleaner directly on the throttle body. Use Acura genuine throttle plate cleaner.
5. Install the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ).
6. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
7. Press the engine start/stop button to select the ON mode.
8. Reset the PCM with the HDS.
9. Select the ETCS TEST in the INSPECTION MENU with the HDS.
10. Select TP POSITION CHECK and clear the throttle position (TP) learned value.
11. Turn the ignition switch to LOCK (0) or press the engine start/stop button to select the OFF mode.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds without pressing the accelerator pedal.
13. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).

Throttle Body Removal/Installation

Scheme 62

Scheme 63

1. Make sure the ignition switch turned LOCK (0) or the engine start/stop button pressed to select OFF mode.
2. Disconnect the MAP sensor connector (A).
3. Remove the intake air duct (B).
4. Disconnect the throttle body connector (C).
5. Disconnect and plug the water bypass hoses (D), then remove the throttle body (E).
6. Install the parts in the reverse order of removal with a new gasket (F). NOTE: When tightening the screw of the hose clamp (G), align the edge of the hose clamp (H) with the painted mark (I). After installation, refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ). If it is in case of replacing or cleaning the throttle body, go to step 7. If it isn't, this procedure is complete.
7. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
8. Press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. Select the ETCS TEST in the INSPECTION MENU with the HDS.
11. Select TP POSITION CHECK and clear the throttle position (TP) learned value.
12. Turn the ignition switch to LOCK (0) or press the engine start/stop button to select the OFF mode.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds without pressing the accelerator pedal.
14. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).

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/INSTALLATION ).

Scheme 64

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/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__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 %, reconnect all connectors, then update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 5.
5. Make sure the accelerator pedal is not pressed, then check the APP SENSOR in the DATA LIST with the HDS. If it is 0 %, the APP sensor is OK. If it is not 0 %, replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system) ), then go to step 1 .

Scheme 65

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

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• PCM IDLE LEARN PROCEDURE
• PCM UPDATE
• SUBSTITUTING THE PCM
• PCM REPLACEMENT
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS
• DLC CIRCUIT TROUBLESHOOTING
• AIR CLEANER ELEMENT INSPECTION/REPLACEMENT
• COOLANT CHECK
• THROTTLE BODY REMOVAL/INSTALLATION
• DTC'S TROUBLESHOOTING
• THROTTLE BODY CLEANING