Pgm-Fi System Acura ZDX I

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Scheme 68

DTC P0101: MAF Sensor Range/Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P1128, P1129, P2228, and/or P2229 are stored at the same time as DTC P0101, troubleshoot those DTCs first, then recheck for DTC P0101.

1. Check for poor connections or damage to these parts: PCV hose Intake air duct Air cleaner Purge (PCS) line Brake booster Brake booster hose Are the parts OK? YES -Go to step 2. NO -Repair or replace the damaged parts, then go to step 14 .
2. Check for a damaged or incorrectly installed intake air duct in the air cleaner. Is it OK? YES -Go to step 3. NO -Reconnect or replace the intake air duct, then go to step 14 .
3. Check for a dirty air cleaner element. Is it dirty? YES -Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 14 . NO -Go to step 4.
4. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
5. Check the MAF SENSOR in the DATA LIST with the HDS. Is there about 0.2 g/s or 0.5 V? YES -Go to step 6. NO -Go to step 12 .
6. Start the engine.
7. Vary the engine speed between 2, 000 rpm and 3, 000 rpm.
8. Check the MAF SENSOR in the DATA LIST with the HDS. Does the reading change? YES -Go to step 9. NO -Go to step 12 .
9. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
10. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAF SENSOR
11. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 12. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 10 and recheck.
12. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
13. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAF SENSOR
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0101 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 18 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 17 .

DTC P0102: MAF Sensor Circuit Low Voltage

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

Scheme 69

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 g/s, or 0.1 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT 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 MAF sensor/IAT sensor 5P 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 MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground. Is there battery voltage? YES -Go to step 7. NO -Repair an open in the wire between PGM-FI main relay 1 and the MAF sensor/IAT sensor, then go to step 19 .
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Measure the resistance between MAF sensor/IAT sensor 5P connector terminal No. 3 and body ground. Is there 190-210 kohms? YES -Go to step 13 . NO -Go to step 9.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector A (49P).
11. Check for continuity between PCM connector terminal A20 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A20) and the MAF sensor/IAT sensor, then go to step 20 . NO -Go to step 12.
12. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 3 and PCM connector terminal A20. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (A20) and the MAF sensor/IAT sensor, then go to step 20 .
13. Substitute a known-good MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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. Clear the DTC with the HDS.
17. Start the engine. Hold the engine speed at 2, 000 rpm without load (in P or N).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Go to step 26 . NO -Replace the original MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19.
19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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 P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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 P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0103: MAF Sensor Circuit High Voltage

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

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 202 g/s, or 4.89 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Jump the SCS line with the HDS.
5. Disconnect the MAF sensor/IAT sensor 5P connector.
6. Disconnect PCM connector A (49P).
7. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and PCM connector terminal A9. Is there continuity? YES -Go to step 8. NO -Repair an open in the wire between the PCM (A9) and the MAF sensor/IAT sensor, then go to step 15 .
8. Reconnect PCM connector A (49P).
9. Connect MAF sensor/IAT sensor 5P connector terminals No. 3 and No. 4 with a jumper wire.
10. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
11. Clear the DTC with the HDS.
12. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Go to step 20 . 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. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Reconnect all connectors.
22. 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) ).
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0107: MAP Sensor Circuit Low Voltage

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

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 inHg, 26 mmHg), or 0.23 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the MAP sensor 3P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 inHg, 26 mmHg), or 0.23 V or less indicated? YES -Go to step 12 . NO -Go to step 7.
7. Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 16 . NO -Go to step 8.
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector B (49P).
11. Check for continuity between PCM connector terminal B36 and MAP sensor 3P connector terminal No. 1. Is there continuity? YES -Go to step 23 . NO -Repair an open in the wire between the PCM (B36) and the MAP sensor, then 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. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (49P).
15. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B35) and the MAP sensor, then go to step 18 . NO -Go to step 23 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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 P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0108: MAP Sensor Circuit High Voltage

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

Scheme 78

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1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 inHg, 1, 197 mmHg), or 4.49 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the MAP sensor 3P connector.
5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 inHg, 1, 197 mmHg), or 4.49 V or more indicated? YES -Go to step 8. NO -Go to step 18 .
8. Remove the jumper wire from the MAP sensor 3P connector.
9. Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 14 . NO -Go to step 10.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector B (49P).
13. Check for continuity between PCM connector terminal B34 and MAP sensor 3P connector terminal No. 3. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (B34) and the MAP sensor, then go to step 20 .
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 B35 and MAP sensor 3P connector terminal No. 2. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (B35) and the MAP sensor, 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 MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
20. Reconnect ail 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 P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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 P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0111: IAT Sensor Circuit Range/Performance Problem

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

1. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the MAF sensor/IAT sensor. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 15 .
2. Remove the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
3. Allow the MAF sensor/IAT sensor to cool to the ambient temperature.
4. Note the ambient temperature.
5. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.
8. Compare the value of the IAT SENSOR to the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more from the ambient temperature? YES -Go to step 13 . NO -Go to step 9.
9. Disconnect the MAF sensor/IAT sensor from the 5P connector.
10. Using a heat gun, blow hot air on the MAF sensor/IAT sensor for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
11. Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
12. Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 76°F (42°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. 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. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P0111 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0112: IAT Sensor Circuit Low Voltage

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

Scheme 82

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the MAF sensor/IAT sensor 5P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check the IAT SENSOR in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch 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 C (49P).
10. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between the MAF sensor/IAT sensor and the PCM (C24), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. 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) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0113: IAT Sensor Circuit High Voltage

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

Scheme 83

Scheme 84

Scheme 85

Scheme 86

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the MAF sensor/IAT sensor 5P connector.
5. Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check the IAT SENSOR in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Remove the jumper wire from the MAF sensor/IAT sensor 5P connector.
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 MAF sensor/IAT sensor 5P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch 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 C (49P).
15. Check for continuity between PCM connector terminal C16 and MAF sensor/IAT sensor 5P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C16) and the MAF sensor/IAT sensor, then go to step 22 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector C (49P).
19. Check for continuity between PCM connector terminal C24 and MAF sensor/IAT sensor 5P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C24) and the MAF sensor/IAT sensor, then go to step 22 .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Reset the PCM with the HDS.
25. 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) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0116: ECT Sensor 1 Range/Performance Problem

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 176°F (80°C) or more, or 0.78 V or less Indicated? YES -Go to step 6 . NO -Go to step 3.
3. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
4. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11 .
6. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Open the hood, and let the engine cool for 3 hours.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11.
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the PCM with the HDS.
15. 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) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0117: ECT Sensor 1 Circuit Low Voltage

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

Scheme 87

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ECT sensor 1 2P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch 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 C (49P).
10. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between ECT sensor 1 and the PCM (C32), then go to step 13. NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. 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) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0118: ECT Sensor 1 Circuit High Voltage

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

Scheme 88

Scheme 89

Scheme 90

Scheme 91

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ECT sensor 1 2P connector.
5. Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Remove the jumper wire from the ECT sensor 1 2P connector.
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 ECT sensor 1 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch 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 C (49P).
15. Check for continuity between PCM connector terminal C16 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C16) and ECT sensor 1, then go to step 22 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector C (49P).
19. Check for continuity between PCM connector terminal C32 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C32) and ECT sensor 1, then go to step 22 .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Reset the PCM with the HDS.
25. 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) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

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

1. Start the engine, and let it idle for 5 minutes or more.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 10°F (-12°C) or less indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the connections and the terminals are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 8 . 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. Allow the engine to cool to 104°F (40°C) or less.
5. Start the engine, and let it idle until ECT SENSOR 1 goes up to about 158°F (70°C). Does ECT SENSOR 2 also read about 158°F (70°C)? YES -Go to step 7 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
6. Check ECT SENSOR 2 in the DATA LIST with the HDS.
7. Check the thermostat (see «FAN MOTOR TEST»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ). Is the thermostat OK? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the connections and the terminals are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 8. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then go to step 8.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Allow the engine to cool to 104°F (40°C) or less.
12. Check ECT SENSOR 2 in the DATA LIST with the HDS.
13. Start the engine, and let it idle until ECT SENSOR 1 goes up to about 158°F (70°C). Does ECT SENSOR 2 also read about 158°F (70°C)? YES -Go to step 1 and recheck. NO -Troubleshooting is complete.

DTC P0128: Cooling System Malfunction

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

1. Turn the ignition switch 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 blower switch OFF.
4. Check the FAN HIGH CTRL and FAN LOW CTRL in the DATA LIST with the HDS. Are they OFF? YES -Go to step 5. NO -Wait until the FAN HIGH CTRL and FAN LOW CTRL are off, then go to step 5.
5. Check the radiator fan operation. Does the radiator fan keep running? YES -Check the radiator fan high speed circuit (see «RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/cooling-fan/#fan-controls) ), and the radiator fan relay (see «RELAY CIRCUIT BOARD TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__relay-circuit-board-test) ). If the circuit and the relay are OK, go to step 19 . NO -Go to step 6.
6. Let the engine cool until the coolant temperature is 104°F (40°C) or less.
7. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
8. Start the engine, and let it idle.
9. Let the engine idle until ECT SENSOR 1 goes up 36°F (20°C) or more from the recorded temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the HDS.
11. Compare the value of recorded ECT SENSOR 2 and the present value of ECT SENSOR 2. Did the temperature rise 14°F (8°C) or more? YES -Test the thermostat (see «FAN MOTOR TEST»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then go to step 12. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
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. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0128 indicated? YES -Check the cooling system, then go to step 19 . NO -Go to step 18.
18. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 17 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check the cooling system, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 14 .
19. 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) ).
20. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
21. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
22. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0128 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 23 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 20 .

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

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

1. Turn the ignition switch 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. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed of 35 mph (57 km/h) or more
5. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. 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) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed of 35 mph (57 km/h) or more
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0133 and/or P0153* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 13 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

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

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

Scheme 92

Scheme 93

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, and let it idle 1 minute.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 4 and PCM connector terminal B13(B14)*. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the PCM (B13 (B14)*)and the A/F sensor (Sensor 1), then go to step 15 .
10. Reconnect PCM connector B (49P).
11. Start the engine, then let it idle without load (in P or N) for at least 1 minute.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . NO -Go to step 13.
13. Turn the ignition switch to lock(0).
14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, then let it idle without load (in P or N) for at least 1 minute.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, 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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, 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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

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.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 14 Fl SUB (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 7. NO -Go to step 20 .
7. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
8. Test the PGM-FI subrelay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 9. NO -Replace the PGM-FI subrelay, then go to step 26 .
9. Disconnect the A/F sensor (Sensor 1) 6P connector.
10. At the sensor side, measure the resistance between A/F sensor (Sensor 1)6P connector terminals No. 1 and No. 2. Is there 2.5-4.0 O at the room temperature? YES -Go to step 11. NO -Go to step 25 .
11. At the sensor side, check for continuity between each terminal of at the A/F sensor (Sensor 1) 6P connector and body ground. Is there continuity to body ground at any terminal? YES -Go to step 25 . NO -Go to step 12.
12. At the sensor side, check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 1 and each of the other terminals in the connectors individually. Is there continuity? YES -Go to step 25 . NO -Go to step 13.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (49P).
15. Check for continuity between PCM connector terminal C6 (C8)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C6 (C8)*) and the A/F sensor (Sensor 1), then go to step 26 . NO -Go to step 16.
16. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 2 and PCM connector terminal C6 (C8)*. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between the PCM (C6 (C8)*) and the A/F sensor (Sensor 1), then go to step 26 .
17. Check for continuity between A/F sensor (Sensor 1)6P connector terminal No. 1 and PGM-FI subrelay 4P connector terminal No. 2. Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step 26 .
18. Disconnect PCM connector A (49P).
19. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and PCM connector terminal A40. Is there continuity? YES -Go to step 32 . NO -Repair an open in the wire between the PGM-FI subrelay and the PCM (A40), then go to step 26 .
20. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
21. Disconnect the front and rear A/F sensor (Sensor 1) 6P connectors.
22. Disconnect the front and rear secondary HO2S (Sensor 2) 4P connectors.
23. Disconnect the EVAP canister vent shut valve 2P connector.
24. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between the PGM-FI subrelay and the A/F sensor (Sensor 1), then go to step 26 . NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 14 Fl SUB (15 A) fuse, then go to step 26 .
25. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
26. Reconnect all connectors.
27. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
28. Reset the PCM with the HDS.
29. 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) ).
30. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . NO -Go to step 31.
31. Monitor the OBD STATUS for DTC P0135 and/or P0155* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 30 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
32. Reconnect all connectors.
33. 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) ).
34. Start the engine, and let it idle.
35. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 and/or P0155* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, 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 34 . If the PCM was substituted, go to step 1 . NO -Go to step 36.
36. Monitor the OBD STATUS for P0135 and/or P0155*in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 35 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, 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 34 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 104

Scheme 105

Scheme 106

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. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 5. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM. If the HDS indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Check the HO2S B1 S2 OUTPUT VOLTAGE and/or HO2S B2 S2 OUTPUT VOLTAGE* in the DATA LIST with the HDS. Does the voltage stay at 0.12 V or less? YES -Go to step 10. NO -Go to step 22 .
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Check the HO2S B1 S2 OUTPUT VOLTAGE and/or HO2S B2 S2 OUTPUT VOLTAGE* in the DATA LIST with the HDS. Is there about 5 V? YES -Go to step 14. NO -Go to step 18 .
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 C (49P).
17. Check for continuity between PCM connector terminal C23 (C36)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C23 (C36)*) and secondary HO2S (Sensor 2), then go to step 24 . NO -Go to step 31 .
18. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
19. Jump the SCS line with the HDS.
20. Disconnect PCM connector B (49P).
21. Check for continuity between PCM connector terminal B25 (B16)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B25 (B16)*) and secondary HO2S (Sensor 2), then go to step 24 . NO -Go to step 31 .
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Replace secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
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. 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.
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 30.
30. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 29 , go. to the indicated DTC's troubleshooting. NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.
31. Reconnect all connectors.
32. 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) ).
33. 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.
34. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 and/or P0157* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2) 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 33 . If the PCM was substituted, go to step 1 . NO -Go to step 35.
35. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 34 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) 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 33 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.

DTC P0138: Rear Secondary HO2S (Bank 1, Sensor 2) Circuit High Voltage; DTC P0158: Front Secondary HO2S (Bank 2, Sensor 2) Circuit High Voltage

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

Scheme 107

Scheme 108

Scheme 109

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, and let it idle without load (in P or N) until the radiator fan comes on.
4. Check the HO2S B1 S2 OUTPUT VOLTAGE and/or HO2S B2 S2 OUTPUT VOLTAGE* in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) 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 secondary HO2S (Sensor 2) 4P connector.
7. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Check the HO2S B1 S2 OUTPUT VOLTAGE and/or HO2S B2 S2 OUTPUT VOLTAGE* in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES -Go to step 10. NO -Go to step 19 .
10. Turn the ignition switch to LOCK(0), or press the engine start/stop button to select the OFF mode.
11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
12. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Check the HO2S B1 S2 OUTPUT VOLTAGE and/or HO2S B2 S2 OUTPUT VOLTAGE* in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES -Go to step 15. NO -Repair an open in the wire between the PCM (C23 (C36)*) and secondary HO2S (Sensor 2), then go to step 21 .
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector B (49P).
18. With the jumper wire still connected between secondary HO2S terminal No. 1 and body ground, check for continuity between PCM connector terminal B25 (B16)* and body ground. Is there continuity? YES -Go to step 29 . NO -Repair an open in the wire between the PCM (B25 (B16)*) and secondary HO2S (Sensor 2), 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 secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
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. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed at 1, 500-3, 000 rpm Maintain a steady speed for 5 seconds or more
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 28.
28. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 27 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 25 .
29. Reconnect all connectors.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
31. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
32. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed at 1, 500-3, 000 rpm Maintain a steady speed for 5 seconds or more
33. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 and/or P0158* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2) 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 31 . If the PCM was substituted, go to step 1 . NO -Go to step 34.
34. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 33 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) 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 31 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 31 .

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

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

1. Turn the ignition switch 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, and let it idle without load (in P or N) until the radiator fan comes on.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Drive at a steady speed between 55-75 mph (88-120 km/h) for 1 minute, then decelerate (with the throttle fully closed) for 10 seconds
5. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. 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) ).
11. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
12. Test-drive under these conditions: Engine coolant temperature above 176°F (80°C) Transmission in D Drive at a steady speed between 55-75 mph (88-120 km/h) for 1 minute, then decelerate (with the throttle fully closed) for 10 seconds
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0139 and/or P0159* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated instep 13 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

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

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

Scheme 110

Scheme 111

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

Scheme 118

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.
4. Check for Pending or Confirmed DTCs with the HDS, Is DTC P0141 and/or P0161* indicated? YES -Go to step 5. NO -Intermittent failure, the systems is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 14 Fl SUB (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 7. NO -Go to step 19 .
7. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
8. Test the PGM-FI subrelay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 9. NO -Replace the PGM-FI subrelay, then go to step 25 .
9. Disconnect the secondary HO2S (Sensor 2) 4P connector.
10. At the sensor side, measure the resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-7.3 ohms at room temperature? YES -Go to step 11. NO -Go to step 24 .
11. At the sensor side, check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. Is there continuity? YES -Go to step 24 . NO -Go to step 12.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (49P).
14. Check for continuity between PCM connector terminal C5 (C7)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C5 (C7)*) and secondary HO2S (Sensor 2), then go to step 25 . NO -Go to step 15.
15. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 3 and PCM connector terminal C5 (C7)*. Is there continuity? YES -Go to step 16. NO -Repair an open in the wire between the PCM (C5 (C7)*) and secondary HO2S (Sensor 2), then go to step 25 .
16. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 4 and PGM-FI subrelay 4P connector terminal No. 2. Is there continuity? YES -Go to step 17. NO -Repair an open in the wire between secondary HO2S (Sensor 2) and the PGM-FI subrelay, then go to step 25 .
17. Disconnect PCM connector A (49P).
18. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and PCM connector terminal A40. Is there continuity? YES -Go to step 31 . NO -Repair an open in the wire between the PGM-FI subrelay and the PCM (A40), then go to step 25 .
19. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
20. Disconnect the front and rear secondary HO2S (Sensor 2) 4P connectors.
21. Disconnect the front and rear A/F sensor (Sensor 1)6P connectors.
22. Disconnect the EVAP canister vent shut valve 2P connector.
23. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 4 and body ground. Is there continuity? YES -Repair a short in the wire between the PGM-FI subrelay and secondary HO2S (Sensor 2), then go to step 25 . NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 14 FI SUB (15 A) fuse, then go to step 25 .
24. Replace secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
25. Reconnect all connectors.
26. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
27. Reset the PCM with the HDS.
28. 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) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, and the PCM, then go to step 1 . NO -Go to step 30.
30. Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 29 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
31. Reconnect all connectors.
32. 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) ).
33. Start the engine, and let it idle.
34. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 and/or P0161* indicated? YES -Check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, 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 33 . If the PCM was substituted, go to step 1 . NO -Go to step 35.
35. Monitor the OBD STATUS for DTC P0141 and/or P0161* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 34 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, 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 33 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If some of the DTCs listed below are stored at the same time as DTC P0171, P0172, P0174, and/or P0175, troubleshoot those DTCs first, then recheck for P0171, P0172, P0174, and/or P0175.

P0101, P0102, P0103: MAF sensor

P0107, P0108, P1128, P1129: MAP sensor

P0133, P0153, P1172, P1174, P2195, P2197, P2237

P2238, P2240, P2241, P2243, P2245, P2247, P2249

P2251, P2252, P2254, P2255, P2A00, P2A03: A/F sensor (Sensor 1)

P0134, P0135, P0154, P0155: A/F sensor (Sensor 1) heater

P0137, P0138, P0139, P0157, P0158, P0159, P2270

P2272: Secondary HO2S (Sensor 2)

P0141, P0161: Secondary HO2S (Sensor 2) heater

P0401, P0404, P0406, P2413: EGR system

P2279: Intake air leakage

P2646, P2647, P2648, P2649: VTEC system

1. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES - DTC P0171 and/or P0174 indicated: Go to step 2. DTC P0172 and/or P0175 indicated: Go to step 3 . NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ), then go to step 6 . If the pressure is too low, check for restrictions in the fuel pump, the fuel pressure regulator, the fuel filter, and the fuel lines. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ), then go to step 6 .
2. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Air intake duct Are the parts OK? YES -Go to step 3. NO -Repair or replace parts with leaks, then go to step 6 .
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. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in P or N All electrical loads off
5. Monitor the ENGINE SPEED in the DATA LIST with the HDS. Raise and hold the engine speed steady at 2, 500 rpm. While holding the rpm steady, check the MAF SENSOR in the DATA LIST. Is there about 9.0-12.7 g/s? YES -Replace the injectors (see «INJECTOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 6. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 6.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Reset the PCM with the HDS.
8. 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) ).
9. 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.
10. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Drive at a steady speed between 15-75 mph (24-120 km/h)for 15 minutes. NOTE: DTC P0171, P0172, P0174, and/or P0175 may take up to 80 minutes of test driving to set. Using the HDS, monitor the short term fuel trim (ST FUEL TRIM). If the ST FUEL TRIM average stays within 0.8-1.21, there is no problem at this time.
11. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0171, P0172, P0174, or P0175 indicated? YES -Go to step 1 and recheck. NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

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

Special Tools Required

1. Pressure Gauge Adapter 07NAJ-P07010A
2. A/T Low Pressure Gauge w/Panel 07406-0070301
3. A/T Pressure Test Hose 07AAJ-PY4A100
4. A/T Pressure Adapter 07MAJ-PY40120
5. Oil Pressure Hose 07ZAJ-S5AA200

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the misfire is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL comes on, and DTC P0300 (and some combination of P0301 through P0306) is stored. If the misfire is frequent enough to damage the catalyst, the MIL blinks whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0306) is stored. When the misfire stops, the MIL stays on. Troubleshoot the following DTCs first, if any of them were stored along with the random misfire DTC(s). Because parts can sometimes fail without setting DTCs also do a physical inspection of the below systems: P0101, P0102, P0103: MAF sensor P0107, P0108, P1128, P1129: MAP sensor P0171, P0172, P0174, P0175: Fuel system P0335, P0339: CKP sensor P0506, P0507: Idle control system P0365, P0369: CMP sensor P0401, P0404, P0406, P2413: EGR system P2646, P2647, P2648, P2649: VTEC system

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, and let it idle without load (in P or N).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, wait for several minutes, then recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 9 . NO -Go to step 6.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS Indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 and recheck.
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Check the fuel quality. Is the quality good? YES -Go to step 11. NO -Drain the fuel tank, fill it with known-good fuel, then go to step 20 .
11. Remove and inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/zdx/i-2009-2013/remont/ignition-system/#ignition-system) ). If the spark plugs are fouled or worn, replace them.
12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
13. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 14. NO -Go to step 20 .
14. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES -Go to step 15. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ), then go to step 20 . If the pressure is too low, check the fuel pump, the fuel feed lines, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ), then go to step 20 .
15. 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.
16. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C) Transmission in P or N All electrical loads off
17. Monitor the ENGINE SPEED in the DATA LIST with the HDS. Raise and hold the engine speed steady at 2, 500±100 rpm. While holding the rpm steady, check the MAF SENSOR in the DATA LIST. Is there about 9.1-12.9 g/s? YES -Go to step 18. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), 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. Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/zdx/i-2009-2013/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Does the engine pass the VTEC rocker arm test? YES -Replace the injector(s) (see «INJECTOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 20. NO -Repair or replace the VTEC rocker arm, then go to step 20.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Reset the PCM with the HDS.
22. 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) ).
23. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
24. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0300 and any combination of DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM, then go to the «TROUBLESHOOTING FOR DTC P0301, P0302, P0303, P0304, P0305, OR P0306»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-no-1-cylinder-misfire) . NO -Go to step 26.
26. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connection or loose terminals at the ignitions coil, the injector, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 24 .

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

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

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

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, and let it idle without load (in P or N) for 2 minutes.
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, wait for several minutes, then recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 9 . NO -Go to step 6.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 .
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals in the fuel system and the ignition system.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Exchange the ignition coil from the problem cylinder with one from another cylinder.
11. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
12. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 13. NO -Intermittent failure due to poor contact at the ignition coil contactor (no misfire at this time). Make sure that the ignition coil connectors are secure.
13. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was moved? YES -Replace the faulty ignition coil (see «IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/ignition-system/#ignition-system) ), then go to step 40 . 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. Exchange the spark plug from the problem cylinder with one from another cylinder.
16. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
17. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 18. NO -Intermittent failure due to spark plug fouling (no misfire at this time).
18. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was moved? YES -Replace the faulty spark plug, then go to step 40 . NO -Go to step 19.
19. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
20. Disconnect the injector 2P connector from the problem cylinder.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Measure the voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 23. NO -Repair an open in the wire between the injector and PGM-FI main relay 1, then go to step 40 .
23. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
24. Jump the SCS line with the HDS.
25. Disconnect PCM connector B (49P).
26. Check for continuity between body ground and the appropriate PCM connector terminal (see table). PCM CONNECTOR TERMINAL PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B4 BRN No. 2 P0302 B8 RED No. 3 P0303 B7 BLU No. 4 P0304 B6 YEL No. 5 P0305 B5 BLK/RED No. 6 P0306 B9 WHT/BLU Is there continuity? YES -Repair a short in the wire between the PCM and the injector, then go to step 40 . NO -Go to step 27.
27. Check for continuity between appropriate injector 2P connector terminal No. 2 and the PCM connector terminal of the problem cylinder (see table). INJECTOR 2P CONNECTOR TERMINAL NO. 2 AND PCM CONNECTOR TERMINAL PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 B4 BRN No. 2 P0302 B8 RED No. 3 P0303 B7 BLU No. 4 P0304 B6 YEL No. 5 P0305 B5 BLK/RED No. 6 P0306 B9 WHT/BLU Is there continuity? YES -Check for poor connections or loose terminals at the injector and PGM-FI main relay 1, then go to step 28. NO -Repair an open in the wire between the PCM and the injector, then go to step 40 .
28. At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms at room temperature? YES -Go to step 29. NO -Replace the injector (see «INJECTOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 40 .
29. Exchange the injector from the problem cylinder with the one from another cylinder. Also check the injector fuel inlet screen for debris, and clean it if needed.
30. Reconnect all connectors, and reinstall the intake manifold.
31. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
32. Clear the DTCs with the HDS.
33. Start the engine, and let it idle without load (in P or N) for 2 minutes.
34. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
35. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts? YES -Go to step 36. NO -Intermittent failure due to poor contact in the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
36. Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was moved? YES -Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 40 . NO -Go to step 37.
37. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
38. Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/zdx/i-2009-2013/remont/mechanical/#cylinder-head__engine-compression-inspection) ). Did the engine pass both tests? YES -Go to step 39. NO -Repair the engine, then go to step 40 .
39. Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/zdx/i-2009-2013/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Did the rocker arm pass the test? YES -Go to step 47 . NO -Repair the VTEC rocker arm, then go to step 40.
40. Reconnect all connectors.
41. Reset the PCM with the HDS.
42. 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) ).
43. Do the CKP pattern learn/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
44. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
45. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM, then go to the troubleshooting for «DTC P0300, P0301, P0302, P0303, P0304, P0305, or P306»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__dtc-p0300-random-misfire-and-any) . NO -Go to step 46.
46. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 45 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 44 .
47. Reconnect all connectors.
48. 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) ).
49. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
50. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0301, P0302, P0303, P0304, P0305, or P0306 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, 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 49 . If the PCM was substituted, go to step 1 . NO -Go to step 51.
51. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 50 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, 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 49 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 49 .

DTC P0325: Knock Sensor Circuit Malfunction

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

Scheme 124

Scheme 125

Scheme 126

Scheme 127

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. Hold the engine speed at 3, 000-4, 000 rpm for at least 10 seconds.
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM.
6. Turn the ignition switch 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 the knock sensor subharness (engine wire harness side) 1P connector.
9. Disconnect PCM connector C (49P).
10. Check for continuity between PCM connector terminal C47 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C47) and the knock sensor subharness, then go to step 20 . NO -Go to step 11.
11. Connect the engine wire harness C151 1P connector terminal to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal C47 and body ground. Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the PCM (C47) and the engine wire harness (C151 connector), then go to step 20 .
13. Remove the jumper wire from the engine wire harness.
14. Remove the intake manifold (see «REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
15. Disconnect the knock sensor 1P connector.
16. Check for continuity between the knock sensor 1P connector terminal and body ground. Is there continuity? YES -Repair a short in the knock sensor subharness, then go to step 19 . NO -Go to step 17.
17. Check for an open in the knock sensor subharness. Is the harness OK? YES -Go to step 18. NO -Repair an open in the knock sensor subharness, then go to step 19 .
18. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
19. Install the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the intake manifold (see «INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
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. Hold the engine speed at 3, 000-4, 000 rpm for at least 10 seconds.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 27 . NO -Go to step 26.
26. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 24 .
27. 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) ).
28. 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.
29. Hold the engine speed at 3, 000-4, 000 rpm for at least 10 seconds.
30. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Check for poor connections or loose terminals at the knock 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 28 . If the PCM was substituted, go to step 1 . NO -Go to step 31.
31. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 30 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the knock 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 28 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 28 .

DTC P0335: CKP Sensor No Signal

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

Scheme 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

Scheme 133

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.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 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 CKP sensor 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 CKP sensor 3P 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 CKP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 9. NO -Repair an open in the wire between the CKP sensor and PGM-FI main relay 1, then go to step 19 .
9. Measure the voltage between CKP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
10. Measure the voltage between CKP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES -Go to step 17 . NO -Repair an open in the wire between the CKP sensor and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 19 .
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. Check for continuity between PCM connector terminal B45 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B45) and the CKP sensor, then go to step 19 . NO -Go to step 15.
15. Connect CKP sensor 3P connector terminal No. 1 to body ground with a jumper wire.
16. Check for continuity between PCM connector terminal B45 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (B45) and the CKP sensor, then go to step 19 .
17. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
18. Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Reset the PCM with the HDS.
22. 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) ).
23. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 Indicated? YES -Check for poor connections or loose terminals at the CKP 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/testing-diagnostics/#pgm-fi-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 P0335 indicated? YES -Check for poor connections or loose terminals at the CKP 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/testing-diagnostics/#pgm-fi-system) .

DTC P0339: CKP Sensor Circuit Intermittent Interruption

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

1. Turn the ignition switch 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, and let it idle for 10 seconds.
4. Monitor the OBD STATUS for DTC P0339 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
6. Monitor the OBD STATUS for DTC P0339 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 5 and recheck.
7. Check for poor connections or loose terminals at these locations: CKP sensor PCM Engine ground Body ground Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or terminals, then go to step 11 .
8. Remove the oil pan (see «OIL PAN REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#engine-block) ), and check the CKP pulse plate (see «COMPONENT LOCATION INDEX»(/acura/zdx/i-2009-2013/remont/mechanical/#engine-block) ) for damage or metal debris. Is the pulse plate damaged? YES -Replace the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#engine-block) ), then go to step 11 . 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. Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Reset the PCM with the HDS.
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) ).
14. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
15. Start the engine, and let it idle for 10 seconds.
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0339 indicated? YES -Check for poor connections or loose terminals at the CKP 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/testing-diagnostics/#pgm-fi-system) .

DTC P0351: No. 1 Cylinder Ignition Coil Circuit Malfunction; DTC P0352: No. 2 Cylinder Ignition Coil Circuit Malfunction; DTC P0353: No. 3 Cylinder Ignition Coil Circuit Malfunction; DTC P0354: No. 4 Cylinder Ignition Coil Circuit Malfunction; DTC P0355: No. 5 Cylinder Ignition Coil Circuit Malfunction; DTC P0356: No. 6 Cylinder Ignition Coil Circuit Malfunction

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

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

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.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, P0354, P0355, and/or P0356 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 ignition coil(s) and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Exchange the ignition coil from the problem cylinder with one from another cylinder.
7. Start the engine.
8. Check for Pending or Confirmed DTCs with the HDS. Is an ignition coil DTC indicated at the exchanged cylinder? YES -Replace the faulty ignition coil (see «IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/ignition-system/#ignition-system) ), then go to step 27 . 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. Check the No. 13 IG COIL (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 11. NO -Go to step 13 .
11. Remove the ignition coil relay (A) from the under-hood fuse/relay box.
12. Test the ignition coil relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 16 . NO -Replace the ignition coil relay, then go to step 26 .
13. Remove the ignition coil relay (A) from the under-hood fuse/relay box.
14. Disconnect all ignition coil 3P connectors.
15. Check for continuity between No. 1 ignition coil 3P connector terminal No. 3 and body ground. Is there continuity? YES -Repair a short in the wire between the ignition coils and the ignition coil relay. Also replace the No. 13 IG COIL (15 A) fuse, then go to step 26 . NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ), then go to step 26 .
16. Reinstall the ignition coil relay.
17. Disconnect the ignition coil 3P connector from the problem cylinder.
18. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
19. Measure the voltage between ignition coil 3P connector terminal No. 3 of the problem cylinder and body ground (see table). IGNITION COIL 3P CONNECTOR TERMINAL NO. 3 PROBLEM CYLINDER DTC No. 1 P0351 No. 2 P0352 No. 3 P0353 No. 4 P0354 No. 5 P0355 No. 6 P0356 Is there battery voltage? YES -Go to step 20. NO -Repair an open in the wire between the ignition coil and the ignition coil relay, then go to step 26 .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Check for continuity between ignition coil 3P connector terminal No. 2 of the problem cylinder and body ground (see table). IGNITION COIL 3P CONNECTOR TERMINAL NO. 2 PROBLEM CYLINDER DTC No. 1 P0351 No. 2 P0352 No. 3 P0353 No. 4 P0354 No. 5 P0355 No. 6 P0356 Is there continuity? YES -Go to step 22. NO -Repair an open in the wire between the ignition coil and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 26 .
22. Jump the SCS line with the HDS.
23. Disconnect PCM connector B (49P).
24. Check for continuity between body ground and the appropriate PCM connector terminal (see table). BODY GROUND AND APPROPRIATE PCM CONNECTOR TERMINAL PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0351 B29 YEL/GRN No. 2 P0352 B30 BLU/RED No. 3 P0353 B22 WHT/BLU No. 4 P0354 B23 BRN No. 5 P0355 B11 BLK/RED No. 6 P0356 B12 BRN/WHT Is there continuity? YES -Repair a short in the wire between the PCM and the ignition coil, then go to step 26 . NO -Go to step 25.
25. Check for continuity between appropriate ignition coil 3P connector terminal No. 1 and the PCM connector terminal of the problem cylinder (see table). IGNITION COIL 3P CONNECTOR TERMINAL NO. 1 AND PCM CONNECTOR TERMINAL PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0351 B29 YEL/GRN No. 2 P0352 B30 BLU/RED No. 3 P0353 B22 WHT/BLU No. 4 P0354 B23 BRN No. 5 P0355 B11 BLK/RED No. 6 P0356 B12 BRN/WHT Is there continuity? YES -Go to step 32 . NO -Repair an open in the wire between the PCM and the ignition coil, then go to step 26.
26. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
27. Reconnect all connectors.
28. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
29. Reset the PCM with the HDS.
30. 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) ).
31. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, P0354, P0355, and/or P0356 indicated? YES -Check for poor connections or loose terminals at the ignition coil(s) 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/testing-diagnostics/#pgm-fi-system) .
32. Reconnect all connectors.
33. 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) ).
34. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, P0354, P0355, and/or P0356 indicated? YES -Check for poor connections or loose terminals at the ignition coil(s) 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/testing-diagnostics/#pgm-fi-system) .

DTC P0365: CMP Sensor Circuit No Signal

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

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

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.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the CMP sensor 3P 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 CMP sensor 3P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 9. NO -Repair an open in the wire between the CMP sensor and PGM-FI main relay 1, then go to step 18 .
9. Measure the voltage between CMP sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
10. Measure the voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES -Go to step 16 . NO -Repair an open in the wire between the CMP sensor and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 18 .
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. Check for continuity between PCM connector terminal B46 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B46) and the CMP sensor, then go to step 18 . NO -Go to step 15.
15. Check for continuity between CMP sensor 3P connector terminal No. 1 and PCM connector terminal B46. Is there continuity? YES -Go to step 23 . NO -Repair an open in the wire between the PCM (B46) and the CMP sensor, 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 CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P0365 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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 P0365 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P0369: CMP Sensor Circuit Intermittent Interruption

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

1. Turn the ignition switch 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, and let it idle for 10 seconds.
4. Monitor the OBD STATUS for DTC P0369 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
6. Monitor the OBD STATUS for DTC P0369 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CMP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 5 and recheck.
7. Check for poor connections or loose terminals at these locations: CMP sensor PCM Engine ground Body ground Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or the terminals, then go to step 11 .
8. Check for damage to the front camshaft pulley (CMP pulse plate) (see «CMP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ). Is the pulse plate damaged? YES -Replace the front camshaft pulley (CMP pulse plate) (see «CMP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 11 . 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. Replace the CMP sensor (see «CMP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Reset the PCM with the HDS.
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) ).
14. Start the engine, and let it idle for 10 seconds.
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0369 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

DTC P050A: Cold Start Idle Air Control System Performance Problem

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050A indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -Go to step 3.
3. Check for poor connections or a blockage at the intake air duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the intake air duct, then go to step 19 .
4. Check for damage to the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 19 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 19 . NO -Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 10. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 .
10. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 11. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ), then go to step 19 .
11. 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.
12. While holding the engine speed at 2, 500 rpm for 30 seconds, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.0-12.7 g/s? YES -Go to step 13. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19 .
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Allow the engine to cool to the ambient temperature.
15. Note the ambient temperature.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
17. Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.
18. Compare the value of the IAT SENSOR and the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19. NO -Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY TEST»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-test) ), then go to step 19. If there is damage in the throttle bore, 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) ), then go to step 19.
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. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
23. Start the engine, and let it idle for 10 seconds or more.
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P050A indicated? YES -Check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 24 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the throttle body, the MAF sensor/IAT sensor, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 22 .

DTC P050B: Cold Start Ignition Timing Performance Problem

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050B indicated? YES -Go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -Go to step 3.
3. Check for poor connections or a blockage at the intake air duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the intake air duct, then go to step 21 .
4. Check for damage at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 21 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ), then go to step 21 . NO -Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 10. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 .
10. Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/zdx/i-2009-2013/remont/ignition-system/#ignition-system) ). Is the ignition timing OK? YES -Go to step 12 . NO -Go to step 11.
11. Check for damage at the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ) and the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#engine-block) ). Is the CKP sensor and/or the CKP pulse plate damaged? YES -Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ) and/or CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mechanical/#engine-block) ), then go to step 21 . NO -Go to step 28 .
12. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 13. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-removalinstallation) ), then go to step 21 .
13. 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.
14. While holding the engine speed at 2, 500 rpm for 30 seconds, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 9.0-12.7 g/s? YES -Go to step 15. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 .
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16. Allow ECT sensor land ECT sensor 2 to cool to the ambient temperature.
17. Note the ambient temperature.
18. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
19. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
20. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature. Refill the cooling system (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then go to step 21. NO -Check and repair any problems with the following items. Repair or replace them if needed, then go to step 21. If all of the items are OK, go to step 28 . Engine compression and cylinder leakdown VTEC system Engine oil A/C system Power steering
21. Turn the ignition switch to ON (II), oppress 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. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
25. Start the engine, and let it idle for 10 seconds or more.
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P050B indicated? YES -Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Go to step 27.
27. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 26 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 24 .
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. 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) ).
30. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
31. Start the engine, and let it idle for 10 seconds or more.
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P050B indicated? YES -Check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 30 . If the PCM was substituted, go to step 1 . NO -Go to step 33.
33. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 32 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, the MAF sensor/IAT sensor, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 30 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 30 .

DTC P0562: Charging System Low Voltage

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

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.
4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0562 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box. Also check the battery performance (see «BATTERY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#battery) ).
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Reset the PCM with the HDS.
9. 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) ).
10. Start the engine.
11. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
12. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0562 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, 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/testing-diagnostics/#pgm-fi-system) .

DTC P0563: PCM Power Source Circuit Unexpected Voltage

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

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

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. 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 P0563 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM.
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. Measure the voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES -Go to step 13 . NO -Go to step 11.
11. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
12. Check for continuity between PCM connector terminal A6 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A6) and PGM-FI main relay 1, then go to step 19 . NO -Go to step 18 .
13. Reconnect PCM connector A (49P).
14. Disconnect PCM connector B (49P).
15. Measure the voltage between PCM connector terminal B3 and body ground. Is there battery voltage? YES -Go to step 16. NO -Go to step 26 .
16. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
17. Measure the voltage between PCM connector terminal B3 and body ground. Is there battery voltage? YES -Repair a short to power in the wire between the PCM (B3) and PGM-FI main relay 1, then go to step 19 . NO -Go to step 18.
18. Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 26 . NO -Replace PGM-FI main relay 1, then go to step 19.
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Reset the PCM with the HDS.
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Wait 10 seconds.
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0563 indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 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/testing-diagnostics/#pgm-fi-system) .
26. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0563 indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 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/testing-diagnostics/#pgm-fi-system) .

DTC P0602: PCM Programming Error

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). This DTC is indicated when a PCM update is not completed. Do not turn the ignition switch to ACC (I) or LOCK (0), or do not press the engine start/stop button while updating the PCM. If you do, the PCM can be damaged.

1. Update the PCM (see «PCM UPDATE»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
2. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0602 indicated? YES -Replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Troubleshooting is complete.

DTC P060A: PCM Internal Control Module Malfunction

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

1. Turn the ignition switch 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 P060A Indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P060A indicated? YES -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/testing-diagnostics/#pgm-fi-system) .

DTC P0615: Starter Cut Relay STRLD Circuit Malfunction

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

Scheme 153

Scheme 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

1. Turn the ignition switch to ON (II), or press the engine start/stop button to the select the ON mode.
2. Clear the DTC with the HDS.
3. Turn the ignition switch to START (III), or press the engine start/stop button to select the START mode, for 1 second or more.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
5. Try to start engine. Does the engine start? YES -Go to step 6. NO -Go to step 16 .
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then check the No. 8 STRLD (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 8. NO -Replace the fuse, then go to step 31 .
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
11. Connect starter cut relay 1 4P connector terminal No. 1 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A28 and body ground. Is there continuity? YES -Go to step 35 . NO -Go to step 13.
13. Disconnect driver's under-dash fuse/relay box connector G (13P).
14. Connect driver's under-dash fuse/relay box connector G (13P) terminal No. 6 to body ground with a jumper wire.
15. Check for continuity between PCM connector terminal A28 and body ground. Is there continuity? YES -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-dash-fuserelay-box) ), then go to step 30 . NO -Repair an open in the wire between the PCM (A28) and the driver's under-dash fuse/relay box, then go to step 30 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
18. Remove starter cut relay 2 (A) from the auxiliary under-hood fuse/relay box.
19. Connect starter cut relay 1 4P connector terminal No. 4 to body ground with a jumper wire.
20. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
21. Check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS while the ignition switch is in START (III) or when you press the engine start/stop button to select the START mode. Is OFF indicated? YES -Go to step 22. NO -Go to step 26 .
22. Remove the jumper wire from the starter cut relay 1 4P connector.
23. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
24. Disconnect the transmission range switch 10P connector (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/zdx/i-2009-2013/remont/automatic-trans/#automatic-transmission) ).
25. At the switch side, check for continuity between transmission range switch 10P connector terminals No. 2 and No. 6 with the shift lever in N, and then in P. Is there continuity in each shift lever position? YES -Repair an open in the wire between the transmission range switch and starter cut relay 1, starter cut relay 2, or G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 30 . NO -Replace the transmission range switch (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/zdx/i-2009-2013/remont/automatic-trans/#automatic-transmission) ), then go to step 30 .
26. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
27. Jump the SCS line with the HDS.
28. Disconnect PCM connector A (49P).
29. Check for continuity between PCM connector terminal A3 and body ground. Is there continuity? YES -Go to step 35 . NO -Repair an open in the wire between the PCM (A3) and starter cut relay 1, then go to step 30.
30. Reconnect all connectors.
31. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
32. Reset the PCM with the HDS.
33. 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) ).
34. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
35. Reconnect all connectors.
36. 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) ).
37. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, 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/testing-diagnostics/#pgm-fi-system) .

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

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

1. Turn the ignition switch 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. Are any Pending or Confirmed DTCs indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P062F indicated? YES -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/testing-diagnostics/#pgm-fi-system) .

DTC P0630: VIN Not Programmed or Mismatch

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES -Go to step 5 . NO -Go to step 3.
3. Input the VIN to the PCM with the HDS. Does the HDS indicate COMPLETE? YES -Go to step 5 . NO -Go to step 4.
4. Check for DTCs with the HDS. Is DTC P062F indicated? YES -Go to the «DTC P062F TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__dtc-p062f-pcm-internal-control-module) (see ). NO -Go to step 9 .
5. Clear the DTC with the HDS.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 5 seconds.
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0630 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
9. 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) ).
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0630 indicated? YES -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/testing-diagnostics/#pgm-fi-system) .

DTC P0641: Sensor Reference Voltage A 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 163

Scheme 164

Scheme 165

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 P0641 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 PCM and these parts. Throttle body Input shaft (mainshaft) speed sensor APP sensor
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Disconnect the connectors from these parts: Throttle body Input shaft (mainshaft) speed sensor APP sensor
6. Turn the ignition switch ON (II), or press the engine start/stop button to select the ON mode.
7. Clear the DTC with the HDS.
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0641 indicated? YES -Go to step 10 . NO -Go to step 9.
9. Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time: Throttle body Input shaft (mainshaft) speed sensor APP sensor Is DTC P0641 indicated? YES -Replace the part that caused the DTC when it was reconnected, then go to step 14 . NO -Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . Throttle body Input shaft (mainshaft) speed sensor APP sensor
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connectors A (49P), B (49P), and C (49P).
13. Check for continuity between body ground and PCM connector terminals A24, B18, and C12 individually. Is there continuity? YES -Repair a short in the wire between the PCM (A24, B18, or C12) and each part that was disconnected in step 5 , then go to step 14. NO -Go to step 20 .
14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0641 indicated? YES -Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . Throttle body Input shaft (mainshaft) speed sensor APP sensor 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/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. 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) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0641 indicated? YES -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, check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . Throttle body Input shaft (mainshaft) speed sensor APP sensor 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/testing-diagnostics/#pgm-fi-system) .

DTC P0651: Sensor Reference Voltage B 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 166

Scheme 167

Scheme 168

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 P0651 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 PCM and these parts: MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Disconnect the connectors from these parts: MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor
6. Turn the ignition switch ON (II), or press the engine start/stop button to select the ON mode.
7. Clear the DTC with the HDS.
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0651 indicated? YES -Go to step 10 . NO -Go to step 9.
9. Check for Pending or Confirmed DTCs with the HDS while reconnecting these parts, one at a time: MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor Is DTC P0651 indicated? YES -Replace the part that caused the DTC when it was reconnected, then go to step 14 . NO -Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect PCM connectors A (49P), B (49P), and C (49P).
13. Check for continuity between body ground and PCM connector terminals A25, B36, and C11 individually. Is there continuity? YES -Repair a short in the wire between the PCM (A25, B36, or C11) and each part that was disconnected in step 5 , then go to step 14. NO -Go to step 20 .
14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0651 indicated? YES -Check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor 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/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. 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) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0651 indicated? YES -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, check for poor connections or loose terminals at the PCM and the following parts, then go to step 1 . MAP sensor EGR valve Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor 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/testing-diagnostics/#pgm-fi-system) .

DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction

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

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, and let it idle for 30 seconds.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Start the engine, and let it idle for 30 seconds.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0685 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
9. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
10. Start the engine, and let it idle for 30 seconds.
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Start the engine, and let it idle for 30 seconds.
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0685 indicated? YES -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 10 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P1109: BARO Sensor Circuit Out of Range High

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

1. Reset the PCM with the HDS.
2. Start the engine.
3. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
4. 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) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -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/testing-diagnostics/#pgm-fi-system) .

DTC P1116: ECT Sensor 1 Range/Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0111 is stored at the same time as DTC P1116, troubleshoot DTC P0111 first, then recheck for DTC P1116.

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 21 .
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Check for Pending or Confirmed DTCs with the HDS. Are DTC P1116 and P2183 Indicated at the same time? YES -Go to step 12 . NO -Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 100°F (38°C) or less? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Go to step 6.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Allow ECT sensor 1 to cool to the ambient temperature.
8. Note the ambient temperature.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Quickly note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
11. Compare the value of ECT SENSOR 1 and the ambient temperature. Does the value of ECT SENSOR 1 differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
12. Start the engine, and let it idle for 10 minutes.
13. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 100°F (38°C) or less? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Go to step 14.
14. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 113°F (45°C) or less? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . 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. Allow ECT sensor 1 and ECT sensor 2 to cool to the ambient temperature.
17. Note the ambient temperature.
18. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
19. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
20. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature. Refill the cooling system (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then go to step 21. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
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 P1116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1128: MAP Sensor Signal Lower Than Expected

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Before starting this troubleshooting, check for poor connections or blockage at the intake air duct.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is less than 54.1 kPa (16.0 inHg, 406 mmHg) or 1.61 V held for more than 5 seconds? YES -Go to step 7 . NO -Go to step 3.
3. Clear the DTC with the HDS.
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. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed about 1, 200 rpm or more Drive at a steady speed about 15 mph (24 km/h) or more (under half throttle) for 2 seconds or more
6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 4 and recheck.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Reset the PCM with the HDS.
11. 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) ).
12. 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.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed about 1, 200 rpm or more Drive at a steady speed about 15 mph (24 km/h) or more (under half throttle) for 2 seconds or more
14. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1128 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 15.
15. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 14 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 12 .

DTC P1129: MAP Sensor Signal Higher than Expected

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

1. Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Are there any vacuum leaks? YES -Repair or replace the part(s) with vacuum leaks, then go to step 9 . NO -Go to step 2.
2. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
3. Check the MAP SENSOR in the DATA LIST with the HDS. Is more than 36.9 kPa (11.0 inHg, 277 mmHg) or 1.14 V held for more than 5 seconds? YES -Go to step 7 . NO -Go to step 4.
4. Clear the DTC with the HDS.
5. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed between 1, 200-5, 900 rpm Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 2 seconds or more.
6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 5 and recheck.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Reset the PCM with the HDS.
11. 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) ).
12. 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.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed between 1, 200-5, 900 rpm Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 2 seconds or more.
14. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1129 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 15.
15. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 14 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 12 .

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

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

1. Turn the ignition switch 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. Monitor the OBD STATUS for P1172 and/or P1174* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 5. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Reset the PCM with the HDS.
9. 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) ).
10. 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.
11. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1172 and/or P1174* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 12.
12. Monitor the OBD STATUS for DTC P1172 and/or P1174* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 11 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 10 .

DTC P1297: ELD Circuit Low Voltage

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

Scheme 169

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ELD 3P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch 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 PCM connector terminal A10 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A10) and the ELD, then go to step 13 . NO -Go to step 20 .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Replace the ELD (see «ELD REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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. Start the engine.
18. Turn on the headlights.
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD 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/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. 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) ).
22. Start the engine.
23. Turn on the headlights.
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD 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 22 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P1298: ELD Circuit High Voltage

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

Scheme 170

Scheme 171

Scheme 172

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the ELD in the DATA LIST with the HDS. Is 0.2 A or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ELD 3P 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 ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 7. NO -Repair an open in the wire between the No. 13 ACG (15 A) fuse in the driver's under-dash fuse/relay box and the ELD, then go to step 13 .
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 PCM connector terminal A10 and ELD 3P connector terminal No. 3. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A10) and the ELD, then go to step 13 .
11. Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between the ELD and G202 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 13 .
12. Replace the ELD (see «ELD REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P1298 indicated? YES -Go to step 18. 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/testing-diagnostics/#pgm-fi-system) .
18. 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) ).
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1298 indicated? YES -Check for poor connections or loose terminals at the ELD 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/testing-diagnostics/#pgm-fi-system) .

DTC P1549: Charging System High Voltage

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If a high voltage battery (24 V, etc.) is connected to the vehicle, this DTC can be stored.

1. Turn the ignition switch 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.
4. Check under these conditions: A/C off Headlights off Rear window defogger off
5. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1549 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Reset the PCM with the HDS.
9. 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) ).
10. Start the engine.
11. Check under these conditions: A/C switch off Headlights off Rear window defogger off
12. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1549 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, 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/testing-diagnostics/#pgm-fi-system) .

DTC P16BB: Alternator B Terminal Circuit Low Voltage

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

1. Turn the ignition switch 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.
4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BB indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box. Also check the battery performance (see «BATTERY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#battery) ).
7. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+ B line). Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or terminals, then go to step 9 .
8. Check for an open in the wire between the alternator and the under-hood fuse/relay box at the starter subharness. Is the harness OK? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/charging-system/#charging-system) ), then go to step 9. NO -Repair an open in the wire between the alternator and the under-hood fuse/relay box, then go to step 9.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Reset the PCM with the HDS.
11. 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) ).
12. Start the engine.
13. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
14. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BB indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, 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/testing-diagnostics/#pgm-fi-system) .

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

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

Scheme 173

Scheme 174

Scheme 175

1. Check for poor connections or loose terminals at the alternator 4P connector. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 18 .
2. Turn the ignition switch to ON (H), or press the engine start/stop button to select the ON mode.
3. Clear the DTC with the HDS.
4. Start the engine.
5. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
6. Hold the engine speed 2, 000 rpm (in P or N) for 1 minute.
7. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Go to step 8. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator.
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Disconnect the alternator 4P connector.
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 alternator 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 12. NO -Repair an open in the wire between the alternator (IG1 line) and the No. 13 ACG (15 A) fuse in the driver's under-dash fuse/relay box, then go to step 17 .
12. Measure the voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/charging-system/#charging-system) ), then go to step 17 . 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. Jump the SCS line with the HDS.
15. Disconnect PCM connector C (49P).
16. Check for continuity between alternator 4P connector terminal No. 4 and PCM connector terminal C44. Is there continuity? YES -Go to step 26 . NO -Repair an open in the wire between the PCM (C44) and the alternator, then go to step 17.
17. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine.
23. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
24. Hold the engine speed at 2, 000 rpm (in P or N) for 1 minute.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
26. Reconnect all connectors.
27. 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) ).
28. Start the engine.
29. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
30. Hold the engine speed 2, 000 rpm (in P or N) for 1 minute.
31. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 28 . If the PCM was substituted, go to step 1 . NO -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/testing-diagnostics/#pgm-fi-system) .

DTC P16BD: Starter Cut Relay 2 Malfunction

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

Scheme 176

Scheme 177

Scheme 178

Scheme 179

Scheme 180

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 the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
4. Try to start engine. Does the engine start? YES -Go to step 5. NO -Go to step 13 .
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then check the No. 8 STRLD (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Replace starter cut relay 2, then go to step 20 . NO -Go to step 7.
7. Remove the blown fuse from the driver's under-dash fuse/relay box.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between the PCM connector terminal A28 and body ground. Is there continuity? YES -Go to step 11. NO -Replace the No. 8 STRLD (7.5 A) fuse, then go to step 25 .
11. Disconnect driver's under-dash fuse/relay box connector G(13P).
12. Check for continuity between the PCM connector terminal A28 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A28) and the driver's under-dash fuse/relay box. Also replace the No. 8 STRLD (7.5 A) fuse, then go to step 20 . NO -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-dash-fuserelay-box) ), then go to step 20 .
13. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
14. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 15. NO -Replace starter cut relay 1, then go to step 20 .
15. Remove starter cut relay 2 (A) from the auxiliary under-hood fuse/relay box.
16. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 17. NO -Replace starter cut relay 2, then go to step 20 .
17. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
18. Disconnect Driver's under-dash fuse/relay box connectors F (33P) and G (13P).
19. Check for continuity between starter cut relay 1 4P connector terminal No. 1 and body ground. Is there continuity? YES -Replace the Driver's under-dash fuse/relay box (see «Driver's UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuses-circuit-breakers/#under-dash-fuserelay-box) ), then go to step 20. NO -Repair a short in the wire between the Driver's under-dash fuse/relay box and the auxiliary under-hood fuse/relay box (starter cut relay 2), then go to step 20.
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 P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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 P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, 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/testing-diagnostics/#pgm-fi-system) .

DTC P16BE: Starter Cut Relay 1 Malfunction

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

Scheme 181

Scheme 182

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, and wait 5 seconds.
3. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 3.0 V or more indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM.
4. Remove the Driver's dashboard undercover (see «Driver's DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove starter cut relay 1 (A) from the Driver's under-dash fuse/relay box.
5. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 3.0 V or more indicated? YES -Go to step 6. NO -Replace starter cut relay 1, then go to step 7 .
6. Measure the voltage between starter cut relay 1 4P connector terminal No. 1 and body ground. Is 3.0 V or more? YES -Repair a short to power in the wire between starter cut relay 1, starter cut relay 2, and the PCM, then go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Reset the PCM with the HDS.
9. 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) ).
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Reconnect all connectors.
13. 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) ).
14. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, 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/testing-diagnostics/#pgm-fi-system) .

DTC P16BF: Starter Cut Relay STRLY Circuit Malfunction

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

Scheme 183

Scheme 184

Scheme 185

Scheme 186

Scheme 187

Scheme 188

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, and wait 5 seconds.
3. Check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 4. NO -Go to step 15 .
4. Turn the ignition switch to START (III), or press the engine start/stop button to select the START mode, for 5 second or more.
5. While holding the ignition switch in START (III) or pressing the engine start/stop button to select START mode, check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, the IG2 cut relay, the ACC cut relay, and the PCM.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Remove the Driver's dashboard undercover (see «Driver's DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove starter cut relay 1 (A) from the Driver's under-dash fuse/relay box.
8. Remove starter cut relay 2 (A) from the auxiliary under-hood fuse/relay box.
9. Test the starter cut relays (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES - With keyless access: Go to step 10. Without keyless access: Go to step 12 . NO -Replace starter cut relay 1 and/or starter cut relay 2, then go to step 25 .
10. Remove the IG2 cut relay, and the ACC cut relay from their sockets (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ).
11. Test the IG2 cut relay, and the ACC cut relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 12. NO -Replace the IG2 cut relay and/or ACC cut relay, then go to step 25 .
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector A (49P).
14. Check for continuity between PCM connector terminal A3 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A3) and starter cut relay 1 or starter cut relay 2, then go to step 25 . NO -Go to step 30 .
15. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
16. Remove the Driver's dashboard undercover (see «Driver's DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove starter cut relay 1 (A) from the Driver's under-dash fuse/relay box.
17. Remove starter cut relay 2 (A) from the auxiliary under-hood fuse/relay box.
18. Test the starter cut relays (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES - With keyless access: Go to step 19. Without keyless access: Go to step 21 . NO -Replace starter cut relay 1 and/or starter cut relay 2, then go to step 25 .
19. Remove the IG2 cut relay, and the ACC cut relay from their sockets (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/zdx/i-2009-2013/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ).
20. Test the IG2 cut relay, and the ACC cut relay (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 21. NO -Replace the IG2 cut relay and/or ACC cut relay, then go to step 25 .
21. Jump the SCS line with the HDS.
22. Disconnect PCM connector A (49P).
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Measure the voltage between PCM connector terminal A3 and body ground. Is there 1.0 V or more? YES -Repair a short to power in the wire between starter cut relay 1, starter cut relay 2, and the PCM (A3) then go to step 25. NO -Go to step 30 .
25. Reconnect all connectors.
26. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
27. Reset the PCM with the HDS.
28. 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) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
30. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
31. Reconnect all connectors.
32. 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) ).
33. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, the IG2 cut relay, the ACC cut 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/testing-diagnostics/#pgm-fi-system) .

DTC P2183: ECT Sensor 2 Circuit Range/Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0111 is stored at the same time as DTC P2183, troubleshoot DTC P0111 first, then recheck for DTC P2183.

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 21 .
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
3. Check for Pending or Confirmed DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES -Go to step 12 . NO -Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 113°F (45°C) or less? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Go to step 6.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Allow ECT sensor 2 to cool to the ambient temperature.
8. Note the ambient temperature.
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Quickly note the value of ECT SENSOR 2 in the DATA LIST with the HDS.
11. Compare the value of ECT SENSOR 2 and the ambient temperature. Does ECT SENSOR 2 differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
12. Start the engine, and let it idle for 10 minutes.
13. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 100°F (38°C) or less? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . NO -Go to step 14.
14. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 113°F (45°C) or less? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 . 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. Allow ECT sensor 1 and ECT sensor 2 to cool to the ambient temperature.
17. Note the ambient temperature.
18. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
19. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
20. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature. Refill the cooling system (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ), then go to step 21. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
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 P2183 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .

DTC P2184: ECT Sensor 2 Circuit Low Voltage

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

Scheme 189

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ECT sensor 2 2P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less Indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch 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 ECT sensor 2 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between ECT sensor 2 and the PCM (A21), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
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 P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. 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) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P2185: ECT Sensor 2 Circuit High Voltage

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

Scheme 190

Scheme 191

Scheme 192

Scheme 193

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the ECT sensor 2 2P connector.
5. Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
7. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.92 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Remove the jumper wire from the ECT sensor 2 2P connector.
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 ECT sensor 2 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch 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 A (49P).
15. Check for continuity between PCM connector terminal A27 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A27) and ECT sensor 2, then go to step 22 .
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector A (49P).
19. Check for continuity between PCM connector terminal A21 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A21) and ECT sensor 2, then go to step 22 .
20. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
21. Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Reset the PCM with the HDS.
25. 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) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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/testing-diagnostics/#pgm-fi-system) .

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

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

1. Check for dirt or debris on the MAF sensor/IAT sensor. Is there dirt or debris? YES -Remove the dirt or debris. If needed, replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 9 . NO -Go to step 2.
2. Check the installation of the A/F sensor (Sensor 1). Is the A/F sensor loose or Improperly installed in the exhaust pipe? YES -Go to step 7 . NO -Go to step 3.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
4. Clear the DTC with the HDS.
5. Start the engine, and let it idle for 2 minutes.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 14 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
9. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
10. Reset the PCM with the HDS.
11. 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) ).
12. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 13.
13. Monitor the OBD STATUS for DTC P2195 and/or P2197* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
14. 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) ).
15. Start the engine, and let it idle for 2 seconds.
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 and/or P2197* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 15 . If the PCM was substituted, go to step 1 . NO -Go to step 17.
17. Monitor the OBD STATUS for DTC P2195 and/or P2197* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 16 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 15 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2227: BARO Sensor Circuit Range/Performance Problem

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0107, P0108, P1128, and/or P1129 are stored at the same time as DTC P2227, troubleshoot those DTCs first, then recheck for DTC P2227.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and wait 2 seconds.
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 101 kPa (29.9 inHg, 760 mmHg), or about 2.9 V at sea level indicated? YES -Go to step 3. NO -Go to step 15 .
3. Clear the DTC with the HDS.
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. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Throttle position between 13 and 26 degrees for at least 3 seconds
6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, go to step 4 and recheck.
7. Check the intake air system for clogging or restrictions (foreign material, dirty air cleaner element, etc). Is the intake air system clogged or restricted? YES -Remove the clog or restriction, then go to step 8. NO -Go to step 15 .
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. 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) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Throttle position between 13 and 26 degrees for at least 3 seconds
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2227 indicated? YES -Check for poor connections or loose terminals at the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 13 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 11 .
15. 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) ).
16. 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.
17. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Throttle position between 13 and 26 degrees for at least 3 seconds
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2227 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 16 . If the PCM was substituted, go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 18 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 16 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 16 .

DTC P2228: BARO Sensor Circuit Low Voltage

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 43 kPa (12.7 inHg, 323 mmHg), or 1.31 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2228 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3 , go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P2229: BARO Sensor Circuit High Voltage

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

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.2 inHg, 1, 200 mmHg), or 4.49 V, or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2229 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted in step 3 , go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/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/testing-diagnostics/#pgm-fi-system) .

DTC P2237: Rear A/F Sensor (Bank 1, Sensor 1) IP Circuit High Voltage; DTC P2240: Front A/F Sensor (Bank 2, Sensor 1) IP Circuit High Voltage

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

Scheme 194

Scheme 195

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 5 to and PCM connector terminal B31 (B32)*. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 15 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 5 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 196

Scheme 197

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B31 (B32)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
10. Reconnect PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 5 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2243: Rear A/F Sensor (Bank 1, Sensor 1) VCENT Circuit High Voltage; DTC P2247: Front A/F Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage

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

Scheme 198

Scheme 199

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2243 and/or P2247 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 6 and PCM connector terminal B15(B24)*. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 15 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 6 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2243 and/or P2247* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 200

Scheme 201

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B15 (B24)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
10. Reconnect PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 6 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2251: Rear A/F Sensor (Bank 1, Sensor 1) VS Circuit High Voltage; DTC P2254: Front A/F Sensor (Bank 2, Sensor 1) VS Circuit High Voltage

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

Scheme 202

Scheme 203

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1)6P connector terminal No. 4 and PCM connector terminal B13(B14)\ Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 15 .
10. Reconnect PCM connector B (49P).
11. 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 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20
20. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated instep 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. If DTC P2251 and/or P2254* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

Scheme 204

Scheme 205

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 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch 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 A/F sensor (Sensor 1) 6P connector.
8. Disconnect PCM connector B (49P).
9. Check for continuity between PCM connector terminal B13 (B14)* and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
10. Reconnect PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3, 000 rpm without load (in P or N) until the radiator fan comes on, then let it idle 2 minutes.
12. Measure the voltage between A/F sensor (Sensor 1) 6P connector terminal No. 4 and body ground. Is there about 0.2 V or less? YES -Go to step 21 . 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. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
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. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
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. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 -Go to step 26.
26. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -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 were indicated in step 25 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/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 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

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

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. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed between 1, 500-3, 700 rpm Drive 35 seconds or more
5. Monitor the OBD STATUS for DTC P2270 and/or P2272* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the HDS indicates NOT COMPLETED, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. 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) ).
11. 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.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Engine speed between 1, 500-3, 700 rpm Drive 35 seconds or more
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2270 and/or P2272* indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P2270 and/or P2272* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 13 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 11 .

DTC P2610: PCM Ignition Off Internal Timer Malfunction

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

1. Turn the ignition switch 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 P2610 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) .
4. 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) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2610 indicated? YES -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/testing-diagnostics/#pgm-fi-system) .

DTC P2A00: Rear A/F Sensor (Bank 1, Sensor 1) Circuit Range/Performance Problem; DTC P2A03: Front A/F Sensor (Bank 2, Sensor 1) Circuit Range/Performance Problem

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

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. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed between 25-55 mph (40-88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for at least 6 seconds.
5. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Reset the PCM with the HDS.
10. 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) ).
11. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Transmission in D Vehicle speed between 25-55 mph (40-88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for at least 6 seconds.
12. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2A00 and/or P2A03* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 13.
13. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12 , go to the indicated «DTC'S TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

Scheme 206

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ). Does the MIL flash? YES -Go to step 3. NO -Substitute a known good gauge control module, and recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
3. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
4. Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES -Go to step 5. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect PCM connector A (49P), then disconnect the HDS.
7. Check for continuity between PCM connector terminal A32 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A32) and the DLC. NO -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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

Scheme 214

Scheme 215

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

Scheme 222

Scheme 223

Scheme 224

Scheme 225

1. Check the No. 3-1 IG MAIN (50 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Repair an open in the wire between the No. 3-1 IG MAIN (50 A) fuse and the ignition switch (without keyless access) or power control unit (with keyless access). If the wire is OK, go to step 2. NO -Repair a short in the wire between the No. 3-1 IG MAIN (50 A) fuse and the ignition switch (without keyless access) or power control unit (with keyless access). Also replace the No. 3-1 IG MAIN (50 A) fuse.
2. Inspect the No. 17 Fl MAIN (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 9 . NO -Go to step 3.
3. Remove the blown No. 17 Fl MAIN (15 A) fuse from the under-hood fuse/relay box.
4. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
5. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 4 individually. 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) ). Also replace the No. 17 Fl MAIN (15 A) fuse. NO -Go to step 6.
6. While disconnecting each of the parts or connectors below, one at a time, check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground: PGM-FI main relay 2 PCM connector B (49P) Each injector 2P connector CMP sensor 3P connector CKP sensor 3P connector MAF sensor/IAT sensor 5P connector Electronic throttle control system (ETCS) control relay Does continuity go away when one of the above parts or connectors is disconnected? YES -Replace the part that made the short to body ground go away when disconnected. If the part is the PCM, 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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 17 Fl MAIN (15 A)fuse. NO -Go to step 7.
7. Disconnect the connectors from these parts: PGM-FI main relay 2 PCM (connector B (49P)) Injectors CMP sensor CKP sensor MAF sensor/IAT sensor Electronic throttle control system (ETCS) control relay
8. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between PGM-FI main relay 1 and each part. Also replace the No. 17 Fl MAIN (15A)fuse. NO -Replace PGM-FI main relay 1. Also replace the No. 17 FI MAIN (15A)fuse.
9. Inspect the No. 9 FUEL PUMP (20 A) fuse in the Driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 19 . NO -Go to step 10.
10. Remove the blown No. 9 FUEL PUMP (20 A) fuse from the Driver's under-dash fuse/relay box.
11. Remove the Driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/zdx/i-2009-2013/remont/gauges-instrument-panels/#dashboard) ), then remove PGM-FI main relay 2 (A) from the Driver's under-dash fuse/relay box.
12. Test PGM-FI main relay 2 (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 13. NO -Replace PGM-FI main relay 2. Also replace the No. 9 FUEL PUMP (20 A) fuse.
13. Check for continuity between PGM-FI main relay 2 4P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 14. NO -Go to step 17 .
14. Jump the SCS line with the HDS.
15. Disconnect PCM connector B (49P).
16. Check for continuity between PCM connector terminal B42 and body ground. Is there continuity? YES -Repair a short in the wire between the No. 9 FUEL PUMP (20 A) fuse and the PCM (B42), between the No. 9 FUEL PUMP (20 A) fuse and PGM-FI main relay 2, or between the No. 9 FUEL PUMP (20 A) fuse and the immobilizer control unit. Also replace the No. 9 FUEL PUMP (20 A) fuse. NO -Replace the No. 9 FUEL PUMP (20 A) fuse, and 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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
17. Disconnect the fuel pump control module 10P connector (see «FUEL PUMP CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ).
18. Check for continuity between fuel pump control module 10P connector terminal No. 3 and body ground. Is there continuity? YES -Repair a short in the wire between the fuel pump control module and PGM-FI main relay 2. Also replace the No. 9 FUEL PUMP (20 A) fuse. NO -Replace the No. 9 FUEL PUMP (20 A) fuse, and substitute a known-good fuel pump control module (see «FUEL PUMP CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ), then recheck. If the symptom/indication goes away with a known-good fuel pump control module, replace the original fuel pump control module (see «FUEL PUMP CONTROL MODULE REPLACEMENT»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system) ).
19. Jump the SCS line with the HDS.
20. Disconnect PCM connectors A (49P) and B (49P).
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. Measure the voltage between PCM connector terminal B42 and body ground. Is there battery voltage? YES -Go to step 23. NO -Repair an open in the wire between the No. 9 FUEL PUMP (20 A) fuse and the PCM (B42).
23. Measure the voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES -Go to step 28 . NO -Go to step 24.
24. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
25. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
26. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 4 and body ground. Is there battery voltage? YES -Go to step 27. 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) ).
27. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 3 and PCM connector terminal A6. Is there continuity? YES -Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, 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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between the PCM (A6) and PGM-FI main relay 1.
28. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
29. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
30. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 31. 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) ).
31. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and PCM connector terminal B3. Is there continuity? YES -Go to step 32. NO -Repair an open in the wire between the PCM (B3) and PGM-FI main relay 1.
32. Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/zdx/i-2009-2013/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 33. NO -Replace PGM-FI main relay 1.
33. Disconnect PCM connectors A (49P), B (49P), and C (49P).
34. Check for continuity between body ground and PCM connector terminals A41, B1, B40, B41, C1, and C41 individually. Is there continuity? YES -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 recheck. If the symptom/indication goes away and the PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire(s) between the PCM (A41, B1, B40, B41, C1, C41) and body ground (G101).

Scheme 226

Scheme 227

1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Remove the intake manifold (see «REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the quick-connect fitting (A) (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-removal) ).
4. Remove the fuel joint hose mounting bolt (B).
5. Disconnect the connectors (C) from the injectors.
6. Remove the fuel rail mounting bolts (D) from the fuel rails (E).
7. Remove the fuel rails and the injectors from the injector base.
8. Remove the injector clips (F) from the fuel rails.
9. Remove the injectors (G) from the fuel rails.
10. Coat the new O-rings (black) (A) with clean engine oil, and insert the injectors (B) into the fuel rails (C).
11. Install the injector clips (D).
12. Coat the new O-rings (green) (E) with clean engine oil.
13. Install the fuel rails and the injectors in the injector base (F).
14. Reinstall the fuel rail mounting bolts, and connect the injector connectors.
15. Reinstall the fuel joint hose mounting bolt.
16. Connect the quick-connect fitting (see «FUEL LINE/QUICK-CONNECT FITTING INSTALLATION»(/acura/zdx/i-2009-2013/remont/fuel-system/#fuel-supply-system__fuel-linequick-connect-fitting-installation) ).
17. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel rail will be pressurized. Repeat this two or three times, then make sure there are no fuel leaks.
18. Reinstall the intake manifold with a new gasket (see «INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).

Scheme 228

1. Remove the engine cover (see step 1 on «REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
2. Disconnect the MAP sensor connector (A).
3. Remove the screw (B).
4. Remove the MAP sensor (C).
5. Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 229

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

Scheme 230

1. Drain the engine coolant (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ).
2. Remove the engine cover (see step 1 on «REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the ECT sensor 1 connector (A).
4. Remove ECT sensor 1 (B).
5. Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ).

Scheme 231

1. Drain the engine coolant (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ).
2. Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/zdx/i-2009-2013/remont/exterior-body-panels/#fenderwell__front-splash-shield-replacement) ).
3. Disconnect the ECT sensor 2 connector (A).
4. Remove ECT sensor 2 (B).
5. Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/zdx/i-2009-2013/remont/cooling-fan/#engine-cooling-system) ).

A/F Sensor Replacement

Special Tools Required

O2 Sensor Socket Wrench Snap-on SWR2 or O2 Sensor Wrench Snap-on YA8875, commercially available

Scheme 232

1. Disconnect the front A/F sensor 6P connector (A), then remove the A/F sensor (B).
2. Install the parts in the reverse order of removal.

Scheme 233

1. Disconnect the rear A/F sensor 6P connector (A), then remove the A/F sensor (B).
2. Install the parts in the reverse order of removal.

Secondary HO2S Replacement

Special Tools Required

O2 Sensor Socket Wrench Snap-on SWR2 or O2 Sensor Wrench Snap-on YA8875, commercially available

Scheme 234

Scheme 235

1. Disconnect the front secondary HO2S 4P connector (A), then remove the harness clamps (B) and the bolt (C).
2. Raise the vehicle on a lift.
3. Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/zdx/i-2009-2013/remont/exterior-body-panels/#fenderwell__front-splash-shield-replacement) ).
4. Remove front secondary HO2S (A).
5. Install the parts in the reverse order of removal.

Scheme 236

1. Raise the vehicle on a lift.
2. Disconnect the rear secondary HO2S 4P connector (A), and remove the harness clamps (B).
3. Remove rear secondary HO2S (C).
4. Install the parts in the reverse order of removal.

Scheme 237

Scheme 238

1. Remove the timing belt (see «TINNING BELT REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#cylinder-head) ).
2. Remove the front camshaft pulley (CMP sensor pulse plate) (A).
3. Disconnect the CMP sensor connector (B), then remove the back cover (C).
4. Remove the CMP sensor (A) from the back cover.
5. Install the parts in the reverse order of removal, then reinstall the timing belt (see «TIMING BELT INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#cylinder-head__timing-belt-installation) ).
6. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

Scheme 239

1. Raise the vehicle on a lift. NOTE: Make sure the vehicle is level, because engine oil will drip out when you remove the sensor.
2. Remove the CKP sensor cover (A).
3. Disconnect the CKP sensor connector (B).
4. Remove the CKP sensor (C).
5. Install the parts in the reverse order of removal with a new O-ring (D).
6. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
7. Check the engine oil level, and add more oil if needed.

Scheme 240

1. Remove the intake manifold (see «REMOVAL»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
2. Remove the injector rails and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/zdx/i-2009-2013/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the knock sensor 1P connector (A), then remove the knock sensor (B).
4. Install the parts in the reverse order of removal.

Scheme 241

Scheme 242

1. Remove 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) ).
2. Remove the fuses (A and B).
3. Release the three lock tabs (A), then remove the ELD (B).
4. Install the parts in the reverse order of removal.

PCM Update

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
3. HDS pocket tester
4. GNA600 and an iN workstation with the latest HDS software version
5. MVCI unit with the latest control module (CM) update software installed

Any one of the above updating tools can be used.

Note. Make sure the HDS/iN workstation or the MVCI unit has the latest HDS software version. Before you update the PCM, make sure the battery in the vehicle is fully charged, and connect a jumper battery (not a battery charger) to maintain system voltage. Never turn the ignition switch to ACC (I) or LOCK (0) or press the engine start/stop button during the update. If there is a problem with the update, leave the ignition switch in ON (II) or keep the vehicle in the ON mode. To prevent PCM damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, moonroof, door locks, etc.) during the update. To ensure the latest program is installed, do a PCM update whenever the PCM is substituted or replaced. You cannot update a PCM with a program it already has. It will only accept anew program. High temperature in the engine compartment might cause the PCM to become too hot to run the update. If the engine has been running before this procedure, open the hood and cool the engine compartment. If you need to diagnose the Honda interface module (HIM) because the HIM's red (#3) light came on or was flashing during the update, leave the ignition switch in ON (II) or keep the vehicle in the ON mode when you disconnect the HIM from the data link connector (DLC). This will prevent PCM damage.

Scheme 243

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the Driver's side of the dashboard.
3. Make sure the HDS communicates with the PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/zdx/i-2009-2013/remont/communication-devices/#communication-systems-f-can-k-line__dlc-circuit-troubleshooting) ).
4. Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to update the PCM.
5. If the software in the PCM is the latest, disconnect the updating tool from the DLC, and go back to the procedure that you were doing. If the software in the PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both. NOTE: If the PCM update system requires you to cool the PCM, follow the instructions on screen. If you run into a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100 %, D or immobilizer indicator flashes, HDS tablet freezes, etc.), follow these steps to minimize the chance of damaging the PCM: Leave the ignition switch in ON (II) or keep the vehicle in the ON mode. Connect a jumper battery (do not connect a battery charger). Shut down the updating tool. Disconnect the updating tool from the DLC. Reboot the updating tool. Reconnect the updating tool to the DLC, and try the update procedure again.
6. 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) ).
7. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

PCM Replacement

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
3. HDS pocket tester
4. GNA600 and an iN workstation with the latest HDS software version
5. MVCI unit with the latest control module (CM) update software installed

Any one of the above updating tools can be used.

Note. Make sure the HDS/iN workstation or the MVCI unit has the latest HDS software version.

Scheme 244

Scheme 245

1. Connect 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 and all other vehicle systems. 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) ). If the result of the DLC circuit troubleshooting is to replace the PCM, skip steps 4 through 7 , 16 through 21 , and 24 through 25 , and do the following procedures after replacing the PCM: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/zdx/i-2009-2013/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/zdx/i-2009-2013/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ). Replace the ATF (see «ATF REPLACEMENT»(/acura/zdx/i-2009-2013/remont/automatic-trans/#automatic-transmission__atf-replacement) ).
4. Select the PGM-FI system with the HDS.
5. Select the REPLACE PCM MENU, then select READ DATA, and follow the screen prompts. NOTE: Doing this step copies (READS) the engine oil life data from the original PCM so you can later download (WRITES) it into the new PCM. If the READ DATA indicates FAILED, continue with this procedure.
6. Select the A/T system with the HDS.
7. Select the REPLACE TCM/PCM MENU, then select READ DATA, and follow the screen prompts. NOTE: Doing this step copies (READS) the ATF life data from the original PCM so you can later download (WRITES) it into the new PCM. If READ DATA indicates FAILED, continue with this procedure.
8. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
9. Jump the SCS line with the HDS.
10. Remove the bracket (D), then remove the cover (E).
11. Disconnect PCM connectors A, B, and C. NOTE: PCM connectors A, B, and C have symbols (A=[], B=delta, C=o) embossed on them for identification.
12. Loosen or remove the bolts (F), and remove the PCM (G).
13. Install the PCM in the reverse order of removal.
14. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
15. Manually input the VIN to the PCM with the HDS. NOTE: DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.
16. If the READ DATA (engine oil life) failed in step 5 , go to step 19 . Otherwise, go to step 17.
17. Select the PGM-FI system with the HDS.
18. Select the REPLACE PCM MENU, then select WRITE DATA, and follow the screen prompts. NOTE: If the WRITE DATA indicates FAILED, continue with this procedure.
19. If the READ DATA (ATF life) failed in step 7 , go to step 22 . Otherwise go to step 20.
20. Select the A/T SYSTEM with the HDS.
21. Select the REPLACE TCM/PCM MENU, then select WRITE DATA, and follow the screen prompts. NOTE: If the WRITE DATA indicates FAILED, continue with this procedure.
22. Select the IMMOBI system (without keyless access) or ONE PUSH START system (with keyless access) with the HDS.
23. Enter the immobilizer PCM code that you got from the iN, and use the PCM replacement procedure in the IMMOBI Menu (without keyless access) or ONE PUSH START Menu (with keyless access) of the HDS; it allows you to start the engine.
24. If the READ DATA failed in step 5 or the WRITE DATA failed in step 18 , replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/zdx/i-2009-2013/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/zdx/i-2009-2013/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 25.
25. If the READ DATA failed in step 7 or the WRITE DATA failed in step 21 , replace the ATF (see «ATF REPLACEMENT»(/acura/zdx/i-2009-2013/remont/automatic-trans/#automatic-transmission__atf-replacement) ), then go to step 26.
26. Clean the throttle body (see «THROTTLE BODY TEST»(/acura/zdx/i-2009-2013/remont/engine-control-systems/#electronic-throttle-control-system__throttle-body-test) ).
27. Select the PGM-FI system, and reset the PCM with the HDS.
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) ).
29. 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) ).
30. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/zdx/i-2009-2013/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• AIR CLEANER ELEMENT INSPECTION/REPLACEMENT
• PCM IDLE LEARN PROCEDURE
• SUBSTITUTING THE PCM
• FAN MOTOR TEST
• RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• RELAY CIRCUIT BOARD TEST
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• FUEL PRESSURE TEST
• FUEL PRESSURE REGULATOR REPLACEMENT
• SPARK PLUG INSPECTION
• VTEC ROCKER ARM TEST
• ENGINE COMPRESSION INSPECTION
• CONNECTOR TO FUSE/RELAY BOX INDEX
• OIL PAN REMOVAL
• THROTTLE BODY REMOVAL/INSTALLATION
• THROTTLE BODY TEST
• ALTERNATOR REMOVAL AND INSTALLATION
• BATTERY TEST
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL AND INSTALLATION
• TRANSMISSION RANGE SWITCH REPLACEMENT
• SELF-DIAGNOSTIC FUNCTION
• GAUGE CONTROL MODULE REPLACEMENT
• FUEL PRESSURE RELIEVING
• FUEL LINE/QUICK-CONNECT FITTING REMOVAL
• FUEL LINE/QUICK-CONNECT FITTING INSTALLATION
• FRONT SPLASH SHIELD REPLACEMENT
• TINNING BELT REMOVAL
• TIMING BELT INSTALLATION
• DLC CIRCUIT TROUBLESHOOTING
• ENGINE OIL REPLACEMENT
• ENGINE OIL FILTER REPLACEMENT
• ATF REPLACEMENT
• MAF SENSOR/IAT SENSOR REPLACEMENT
• PCM UPDATE
• PCM REPLACEMENT
• A/F SENSOR REPLACEMENT
• SECONDARY HO2S REPLACEMENT
• TROUBLESHOOTING FOR DTC P0301, P0302, P0303, P0304, P0305, OR P0306
• DTC P0300, P0301, P0302, P0303, P0304, P0305, or P306
• DTC P062F TROUBLESHOOTING