Pgm-Fi System Acura TL IV

Scheme 118

Scheme 119

DTC P0101: MAF 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 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 part(s), then go to step 14 .
2. Check for damage or looseness at the air duct in the air cleaner. Is it OK? YES -Go to step 3. NO -Reconnect or replace the 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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 gm/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 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 (A/T in P or N, M/T in neutral) 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 VSS MAP SENSOR MAF SENSOR
11. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 13. NO -If the screen 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 ECM/PCM. If the screen 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS 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 ECM/PCM, then go to step 1 . NO -Go to step 20.
19. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to step 1 . If the screen 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 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, and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 gm/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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 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 ECM/PCM connector A (49P).
11. Check for continuity between ECM/PCM connector terminal A20 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM connector terminal A20. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/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/tl/iv-2008-2011/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 (A/T in P or N, M/T in neutral).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Reinstall the original MAF sensor/IAT sensor, then go to step 26 . NO -Replace the original MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 ).

Scheme 124

Scheme 125

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 gm/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 ECM/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 ECM/PCM connector A (49P).
7. Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and ECM/PCM connector terminal A9. Is there continuity? YES -Go to step 8. NO -Repair open in the wire between the ECM/PCM (A9) and the MAF sensor/IAT sensor, then go to step 15 .
8. Reconnect ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0107: MAP 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 126

Scheme 127

Scheme 128

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector B (49P).
11. Check for continuity between ECM/PCM connector terminal B36 and MAP sensor 3P connector terminal No. 1. Is there continuity? YES -Go to step 23 . NO -Repair open in the wire between the ECM/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 ECM/PCM connector B (49P).
15. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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 «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 129

Scheme 130

Scheme 131

Scheme 132

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector B (49P).
13. Check for continuity between ECM/PCM connector terminal B34 and MAP sensor 3P connector terminal No. 3. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/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 ECM/PCM connector B (49P).
17. Check for continuity between ECM/PCM connector terminal B35 and MAP sensor 3P connector terminal No. 2. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/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 «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-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 ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 sensors 1 and 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/tl/iv-2008-2011/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. Note the value of the IAT SENSOR quickly 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 ambient temperature? YES -Go to step 13 . NO -Go to step 9.
9. Disconnect the MAF sensor/IAT sensor from its 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 68°F (38°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 ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0111 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 133

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/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 short in the wire between the MAF sensor/IAT sensor and the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 134

Scheme 135

Scheme 136

Scheme 137

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector C (49P).
15. Check for continuity between ECM/PCM connector terminal C16 and MAF sensor/IAT sensor 5P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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 ECM/PCM connector C (49P).
19. Check for continuity between ECM/PCM connector terminal C24 and MAF sensor/IAT sensor 5P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0116: ECT 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 ).

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 (A/T in P or N, M/T in neutral) 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 ECM/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 ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 land the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 138

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/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 short in the wire between ECT sensor 1 and the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 139

Scheme 140

Scheme 141

Scheme 142

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector C (49P).
15. Check for continuity between ECM/PCM connector terminal C16 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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 ECM/PCM connector C (49P).
19. Check for continuity between ECM/PCM connector terminal C32 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 ECM/PCM. If the connections and the terminals are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 7 . 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 6. 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 ECM/PCM.
6. Check the thermostat (see «THERMOSTAT TEST»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system__thermostat-test) ). Is the thermostat OK? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM. If the connections and the terminals are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 7. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ), then go to step 7.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Reset the ECM/PCM with the HDS.
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Allow the engine to cool to 104°F(40°C) or less.
11. 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. Make sure the blower switch is off.
4. Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES -Go to step 5. NO -Wait until the FAN CTRL is 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/tl/iv-2008-2011/remont/cooling-fan/#fan-controls) ), and the radiator fan relay (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-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 34°F (19°C) or more from the recorded temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the HDS.
11. Compare the recorded value of ECT SENSOR 2 and the present value of ECT SENSOR 2. Did the temperature rise 9°F (5°C) or more? YES -Test the thermostat (see «THERMOSTAT TEST»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system__thermostat-test) ), 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 ECM/PCM.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
13. Reset the ECM/PCM with the HDS.
14. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 the 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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check the cooling the system, then go to step 19. If the screen indicates NOT COMPLETED, go to step 14 .
19. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 (A/T in P or N, M/T in neutral) 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 20 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 20 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 (A/T in P or N, or M/T in neutral) 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) A/T in D, M/T in 5th Engine speed between 1,250-2,100 rpm 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 screen indicate FAILED? YES -Go to step 6. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutal) 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) A/T in D, M/T in 5th Engine speed between 1,250-2,100 rpm 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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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 143

Scheme 144

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 (A/T in P or N, M/T in neutral) for at least 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 4 and ECM/PCM connector terminal B13(B14)\ Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (B13 (B14)*) and A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) 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 20 . NO -Go to step 13.
13. Replace A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 and/or P0154* indicated? YES -Check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) for at least 1 minute.
24. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P0134 and/or P0154* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

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 ECM/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/tl/iv-2008-2011/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 ohms 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 ground at any of the terminals? 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 ECM/PCM connector C (49P).
15. Check for continuity between ECM/PCM connector terminal C6 (C8)* and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (C6 (C8)*) and 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 ECM/PCM connector C6 (C8)*. Is there continuity? YES -Go to step 17. NO -Repair open in the wire between the ECM/PCM (C6 (C8)*) and 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 open in the wire between A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step 26 .
18. Disconnect ECM/PCM connector A (49P).
19. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and ECM/PCM connector terminal A40. Is there continuity? YES -Go to step 32 . NO -Repair open in the wire between the PGM-FI subrelay, and the ECM/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 short in the wire between the PGM-FI subrelay and 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/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 14 Fl SUB (15 A) fuse, then go to step 26 .
25. Replace A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
29. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
32. Reconnect all connectors.
33. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 36.
36. Monitor the OBD STATUS for DTC P0135 or P0155* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 35 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 34 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 155

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Check HO2S B1 S2 and/or HO2S B2 S2* in the DATA LIST with the HDS. Does the voltage stay at 0.05 V or less? 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
8. Check HO2S B1 S2 and/or HO2S B2 S2* in the DATA LIST with the HDS. Does the voltage stay at 0.05 V or less? YES -Go to step 9. NO -Go to step 13 .
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector B (49P).
12. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B25 (B16)*) and secondary HO2S (Sensor 2), then go to step 15 . NO -Go to step 23 .
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Replace secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-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 ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
20. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th Engine speed between 1,500-3,000 rpm Drive 1 minute or more
21. 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 ECM/PCM, then go to step 1 . NO -Go to step 22.
22. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 21 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 19 .
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Start the engine, and let it idle without load (A/Tin P or N, M/T in neutral) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th Engine speed between 1,500-3,000 rpm Drive 1 minute or more
27. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 25 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 28.
28. Monitor the OBD STATUS for DTC P0137 and/or P0157* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 27 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 25 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 .

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 156

Scheme 157

Scheme 158

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Check HO2S B1 S2 and/or HO2S B2 S2* 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the 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 HO2S B1 S2 and/or HO2S B2 S2* 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 HO2S B1 S2 and/or HO2S B2 S2* in the DATA LIST with the HDS. Does the voltage stay at 1.27 V or more? YES -Go to step 15. NO -Repair open in the wire between the ECM/PCM (C15) 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 ECM/PCM connector B (49P).
18. Check for continuity between ECM/PCM connector terminal B25 (B16)* and body ground. Is there continuity? YES -Go to step 29 . NO -Repair open in the wire between the ECM/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 the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
24. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th Engine speed between 1,500-3,000 rpm Drive 1 minute 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 the secondary HO2S (Sensor 2) and the ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 .
29. Reconnect all connectors.
30. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
31. Start the engine, and let it idle without load (A/T in P or N, M/Tin neutral) until the radiator fan comes on, then let it idle.
32. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/Tin 4th Engine speed between 1,500-3,000 rpm Drive 1 minute 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 31 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 33 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 31 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th 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 screen indicate FAILED? YES -Go to step 6. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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 secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th 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 secondary HO2S (Sensor 2) and the ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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 159

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

Scheme 167

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 ECM/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/tl/iv-2008-2011/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 ECM/PCM connector C (49P).
14. Check for continuity between ECM/PCM connector terminal C5 (C7)* and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM connector C5 (C7)*. Is there continuity? YES -Go to step 16. NO -Repair open in the wire between the ECM/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 open in the wire between secondary HO2S (Sensor 2) and the PGM-FI subrelay, then go to step 25 .
17. Disconnect ECM/PCM connector A (49P).
18. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and ECM/PCM connector terminal A40. Is there continuity? YES -Go to step 31 . NO -Repair open in the wire between the PGM-FI subrelay, and the ECM/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 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/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 14 Fl SUB (15 A) fuse, then go to step 25 .
24. Replace secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
28. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
31. Reconnect all connectors.
32. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 33 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 34 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary HO2S (Sensor 2), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 33 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 ). Poor fuel quality can also cause DTC P0171/P0174. If any 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, P2271, P2272, P2273: Secondary HO2S (Sensor 2) P0141, P0161: Secondary HO2S (Sensor 2) heater P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: EGR system P2279: Intake air leakage

1. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES -Go to step 2. NO -Check these items: If the pressure is too high, replace the fuel pressure regulator; without SH-AWD (see «WITHOUT SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), with SH-AWD (see «WITH SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), then go to step 2. If the pressure is too low, check the fuel pump, the fuel pressure regulator, the fuel filter, and the fuel lines for restrictions, then go to step 6 .
2. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
3. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in P or N, M/T in neutral All electrical loads off
4. Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES -Repeat step 4 . NO -Go to step 5.
5. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 11.0-15.5 gm/s (J35Z6 engine) or 11.8-16.6 gm/s (J37A4 engine)? YES -Check the engine valve clearances, and adjust them if needed (see «VALVE CLEARANCE ADJUSTMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6__valve-clearance-adjustment) ). If the valve clearances are OK, replace the injectors (see «INJECTOR REPLACEMENT»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
8. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
9. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
10. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th 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 long term fuel trim (LT FUEL TRIM). If the LT FUEL TRIM 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 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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. AT 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 will come on, and DTC P0300 (and some combination of P0301 through P0306) will be stored. If the misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfire stops, the MIL will remain 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 you should also do a physical inspection of the systems listed below): 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 P2646, P2647, P2648, P2649: VTEC system P0401, P0404, P0406, P2413: EGR system

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. Start the engine, and let it idle without load (A/T in P or N, M/Tin neutral).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 9 . NO -If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen 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 VSS 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 screen indicate FAILED? YES -Go to step 9 . NO -If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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, and fill it with known-good fuel, then go to step 23 .
11. Inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/tl/iv-2008-2011/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 VSS 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 23 .
14. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tl/iv-2008-2011/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; without SH-AWD (see «WITHOUT SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), with SH-AWD (see «WITH SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), then go to step 23 . 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; without SH-AWD (see «WITHOUT SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), with SH-AWD (see «WITH SH-AWD»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), then go to step 23 .
15. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
16. Check under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) A/T in N, M/T in neutral All electrical loads off
17. Monitor the ENGINE SPEED in the DATA LIST with the HDS, and hold the engine speed at 2,500 rpm. Once the engine speed is met, hold the accelerator pedal steady for more than 10 seconds. Did the engine speed vary more than 100 rpm from 2,500 rpm? YES -Repeat step 17 . NO -Go to step 18.
18. While holding the engine speed at 2,500 rpm, check the MAF SENSOR in the DATA LIST with the HDS. Is there about 11.0-15.5 gm/s (J35Z6 engine) or 11.8-16.6 gm/s (J37A4 engine)? YES -Go to step 19. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 23 .
19. Remove the rocker arm oil pressure switch (A), and attach the special tools as shown, then attach the rocker arm oil pressure switch to the pressure gauge adapter (B).
20. Reconnect the rocker arm oil pressure switch 2P connector.
21. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on.
22. Check the oil pressure at engine speeds of 1,000 and 2,000 rpm. Keep the measuring time as short as possible (less than 1 minute) because the engine is running without load. Is the oil pressure below 49 kPa (0.5 kgf/cm 2 , 7 psi)? YES -Go to step 23. NO -Inspect the VTEC system, then go to step 23.
23. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
24. Reset the ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
27. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) ECT SENSOR 1 APP SENSOR
28. 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 ECM/PCM, then go to the DTC P0301, P0302, P0303, P0304, P0305, or P0306 troubleshooting (see «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»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-no-1-cylinder-misfire) ). NO -Go to step 29.
29. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 28 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connection or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 27 .

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 169

Scheme 170

Scheme 171

Scheme 172

Scheme 173

Scheme 174

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 for 2 minutes (A/T in P or N, M/T in neutral).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 9 . NO -If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, and 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 VSS 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 screen indicate FAILED? YES -Go to step 9 . NO -If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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 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 VSS 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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/ignition-system/#ignition-system) ), then go to step 44 . 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 VSS 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 44 . 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. Jump the SCS line with the HDS.
21. Disconnect ECM/PCM connector B (49P).
22. Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
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 body ground and the appropriate ECM/PCM connector terminal (see table) VOLTAGE TERMINAL REFERENCE CHART PROBLEM CYLINDER DTC ECM/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 battery voltage? YES -Go to step 32 . NO -Go to step 25.
25. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
26. Disconnect the injector 2P connector from the problem cylinder.
27. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
28. Measure the voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 29. NO -Repair open in the wire between the injector and PGM-FI main relay 1, then go to step 44 .
29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
30. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). CONTINUITY TERMINAL REFERENCE CHART PROBLEM CYLINDER DTC ECM/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 short in the wire between the ECM/PCM and the injector, then go to step 44 . NO -Go to step 31.
31. Check for continuity between appropriate injector 2P connector terminal No. 2 and the ECM/PCM connector terminal of the problem cylinder (see table). CONTINUITY TERMINAL REFERENCE CHART PROBLEM CYLINDER DTC ECM/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 32. NO -Repair open in the wire between the ECM/PCM and the injector, then go to step 44 .
32. 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 33. NO -Replace the injector (see «INJECTOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 44 .
33. 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.
34. Reconnect all connectors, and install the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
35. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
36. Clear the DTCs with the HDS.
37. Start the engine, and let it idle without load (A/T in P or N, M/T in neutral) for 2 minutes.
38. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
39. 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 40. 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.
40. 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 44 . NO -Go to step 41.
41. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
42. Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6__engine-compression-inspection) ). Did the engine pass both tests? YES -Go to step 43. NO -Repair the engine, then go to step 44 .
43. Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6__vtec-rocker-arm-test) ). Did the engine pass the test? YES -Go to step 51 . NO -Repair the VTEC rocker arm, then go to step 44.
44. Reconnect all connectors.
45. Reset the ECM/PCM with the HDS.
46. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
47. Do the CKP pattern learn/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
48. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
49. 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 ECM/PCM, then go to step then go to troubleshooting DTC P0300, P0301, P0302, P0303, P0304, P0305, or P306 (see «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»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p0300-random-misfire-and-any) ). NO -Go to step 50.
50. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 49 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 48 .
51. Reconnect all connectors.
52. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
53. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS REL TP SENSOR CLV (calculated load value) GEAR POSITION ECT SENSOR 1
54. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 53 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 55.
55. Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 54 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 53 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 53 .

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 175

Scheme 176

Scheme 177

Scheme 178

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. 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 ECM/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 1P connector.
9. Disconnect ECM/PCM connector C (49P).
10. Check for continuity between ECM/PCM connector terminal C47 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (C47) and the knock sensor subharness, then go to step 20 . NO -Go to step 11.
11. Connect the engine wire harness C104 1P connector terminal to body ground with a jumper wire.
12. Check for continuity between ECM/PCM connector terminal C47 and body ground. Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the ECM/PCM (C47) and the engine wire harness (C104 connector), then go to step 20 .
13. Remove the jumper wire from the engine wire harness.
14. Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
15. Disconnect the knock sensor 1P connector.
16. Check for continuity between the knock sensor subharness 1P connector terminal and body ground. Is there continuity? YES -Repair 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 open in the knock sensor subharness, then go to step 19 .
18. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ).
19. Install the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. 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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 24 .
27. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
28. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 28 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 30 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the knock sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 28 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the 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 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 open in the wire between the CKP sensor and G101, 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 ECM/PCM connector B (49P).
14. Check for continuity between ECM/PCM connector terminal B45 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM connector terminal B45 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/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 «KNOCK SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
22. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 indicated? YES -Check for poor connections or loose terminals at the CKP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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. Check the CKP NOISE in the DATA LIST with the HDS. Are 0 counts indicated? YES -Go to step 7 . NO -Go to step 5.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
6. Check the CKP NOISE in the DATA LIST with the HDS. Are 0 counts 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 CKP sensor and the ECM/PCM.
7. Check for poor connections or loose terminals and terminals at these locations: CKP sensor ECM/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/tl/iv-2008-2011/remont/mechanical/#engine-block) ), and check for damage to the CKP pulse plate. Is the pulse plate damaged? YES -Replace the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tl/iv-2008-2011/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 «KNOCK SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
13. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

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 ECM/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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/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 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/tl/iv-2008-2011/remont/body-electrical/#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). VOLTAGE TERMINAL REFERENCE CHART 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 open in the wire between the ignition coils 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). CONTINUITY TERMINAL REFERENCE CHART 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 open in the wire between the ignition coil and G101, then go to step 26 .
22. Jump the SCS line with the HDS.
23. Disconnect ECM/PCM connector B (49P).
24. Check for continuity between body ground and the appropriate ECM/PCM connector terminal (see table). CONTINUITY TERMINAL REFERENCE CHART PROBLEM CYLINDER DTC ECM/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 short in the wire between the ECM/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 ECM/PCM connector terminal of the problem cylinder (see table). CONTINUITY TERMINAL REFERENCE CHART PROBLEM CYLINDER DTC ECM/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 open in the wire between the ECM/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 ECM/PCM with the HDS.
30. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
32. Reconnect all connectors.
33. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 193

Scheme 194

Scheme 195

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.
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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect the 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 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 open in the wire between the CMP sensor and G101, 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 ECM/PCM connector B (49P).
14. Check for continuity between ECM/PCM connector terminal B46 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM connector terminal B46. Is there continuity? YES -Go to step 23 . NO -Repair open in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at the CMP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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. Check the CMP B NOISE in the DATA LIST with the HDS. Are 0 counts indicated? YES -Go to step 7 . NO -Go to step 5.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VSS
6. Check the CMP B NOISE in the DATA LIST with the HDS. Are 0 counts 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 CMP sensor and the ECM/PCM.
7. Check for poor connections or loose terminals at these locations: CMP sensor ECM/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 pully (CMP pulse plate) (see «CMP SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ). Is the pulse plate damaged? YES -Replace the front camshaft pully (CMP pulse plate); J35Z6 engine (see «CAMSHAFT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6) ), J37A4 engine (see «CAMSHAFT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j37a4) ), 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
13. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/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 at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 screen indicate FAILED? YES -Go to step 10. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 19 .
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 11.0-15.5 gm/s (J35Z6 engine) or 11.8-16.6 gm/s (J37A4 engine)? YES -Go to step 13. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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. Note the value of IAT SENSOR quickly 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 ambient temperature? YES -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 19. If there is damage in the throttle bore, replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. 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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen 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 screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 22 .

DTC P050B: Cold Start Ignition Timing 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 P050B indicated? YES -Go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 -Correct the problem, then reconnect the intake air duct, and 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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-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 screen indicate FAILED? YES -Go to step 10. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 .
10. Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/tl/iv-2008-2011/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 «KNOCK SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ) and the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#engine-block) ). Is the CKP sensor and/or the CKP pulse plate damaged? YES -Replace the CKP sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ) and/or the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/mechanical/#engine-block) ), then go to step 21 . NO -Go to step 27 .
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/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-removalinstallation) ), then go to step 21 .
13. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 11.0-15.5 gm/s (J35Z6 engine) or 11.8-16.6 gm/s (J37A4 engine)? YES -Go to step 15. NO -Replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 the ECT sensors 1 and 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 quickly 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, then go to step 24. NO -Check and repair any problems with the following items. Repair or replace them if needed, then go to step 24. 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), or press the engine start/stop button to select the ON mode.
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen 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 ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 24 .
28. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
29. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 30 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 32 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 30 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING, keep idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 30 .

DTC P0560: 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 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, and let it idle.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0560 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 No. 19 BACK UP Fl ECU (7.5 A) fuse in the under-hood fuse relay box and the ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Check the No. 19 BACK UP Fl ECU (7.5 A) fuse in the under-hood fuse relay box. Is the fuse OK? YES -Go to step 7. NO -Go to step 10 .
7. Jump the SCS line with the HDS.
8. Disconnect ECM/PCM connector A (49P).
9. Measure the voltage between ECM/PCM connector terminal A23 and body ground. Is there battery voltage? YES -Go to step 19 . NO -Repair open in the wire between the ECM/PCM (A23) and the No. 19 BACK UP Fl ECU (7.5 A) fuse, then go to step 13 .
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector A (49P).
12. Check for continuity between ECM/PCM connector terminal A23 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (A23) and the No. 19 BACK UP Fl ECU (7.5 A) fuse. Also replace the No. 19 BACK UP Fl ECU (7.5 A) fuse, then go to step 13. NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 19 BACK UP Fl ECU (7.5 A) fuse, then go to step 13.
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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Start the engine, and let it idle.
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0560 indicated? YES -Check for poor connections or loose terminals at the No. 19 BACK UP Fi ECU (7.5 A) fuse and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
19. Reconnect all connectors.
20. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
21. Start the engine, and let it idle.
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0560 indicated? YES -Check for poor connections or loose terminals at the No. 19 BACK UP Fl ECU (7.5 A) fuse and the ECM/PCM. If the ECM/PCM updated, substitute a known-good ECM/PCM, then go to step 21 . If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

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.

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 Headlights on high beam Rear window defogger on
5. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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/tl/iv-2008-2011/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, and check the battery performance (see «BATTERY TEST»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 Headlights on high beam Rear window defogger on
12. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0563: ECM/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 200

Scheme 201

Scheme 202

Scheme 203

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. 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 ECM/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 ECM/PCM connector A (49P).
10. Measure the voltage between ECM/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 ECM/PCM connector terminal A6 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (A6)and PGM-FI main relay 1, then go to step 19 . NO -Go to step 18 .
13. Reconnect ECM/PCM connector A (49P).
14. Disconnect ECM/PCM connector B (49P).
15. Measure the voltage between ECM/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 ECM/PCM connector terminal B3 and body ground. Is there battery voltage? YES -Repair short to power in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/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 ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0602: ECM/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 an ECM/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 ECM/PCM. If you do, the ECM/PCM can be damaged.

1. Do the ECM/PCM update procedure (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ).
2. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0602 indicated? YES -Replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -The update is complete.

DTC P060A: ECM/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P060A indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0615: Starter Cut Relay STR LD Circuit Malfunction (M/T)

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

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

Scheme 212

Scheme 213

Scheme 214

Scheme 215

1. Press the engine start/stop button to select the ON mode.
2. Check for Pending or Confirmed DTCs with the HDS. Are DTC P16BD and P0615 indicated at the same time? YES -Go to the troubleshooting for DTC P16BD (see «DTC P0616: STARTER RELAY 2 MALFUNCTION (M/T); DTC P16BD: STARTER CUT RELAY 2 MALFUNCTION (M/T)»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p16bd-starter-cut-relay-2) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Press the engine start/stop button to select the START mode, for 1 second or more.
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 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 + B cut relay, and the ECM.
6. Try to start engine. Does the engine start? YES -Go to step 7. NO -Go to step 17 .
7. Press the engine start/stop button to select the OFF mode.
8. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then check the No. 8 STR LD (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 9. NO -Replace the fuse, then go to step 26 .
9. Jump the SCS line with the HDS.
10. Disconnect ECM connector A (49P).
11. Remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
12. Connect starter cut relay 1 4P connector terminal No. 1 to body ground with a jumper wire.
13. Check for continuity between ECM connector terminal A28 and body ground. Is there continuity? YES -Go to step 30 . NO -Go to step 14.
14. Disconnect driver's under-dash fuse/relay box connector G (13P).
15. Connect driver's under-dash fuse/relay box connector G (13P) terminal No. 6 to body ground with a jumper wire.
16. Check for continuity between ECM 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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 25 . NO -Repair open in the wire between the ECM (A28) and the driver's under-dash fuse/relay box, then go to step 25 .
17. Press the engine start/stop button to select the OFF mode.
18. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
19. Check for continuity between starter cut relay 1 4P connector terminal No. 3 and body ground. Is there continuity? YES -Go to step 20. NO -Repair open in the wire between starter cut relay 1 and G301 (see «LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH)»(/acura/tl/iv-2008-2011/remont/body-electrical/#connectors-and-harnesses__left-engine-compartment-wire-harness-engine) ), then go to step 25 .
20. Check for continuity between the +B cut relay terminal No. 3 and body ground. Is there continuity? YES -Go to step 21. NO -Repair open in the wire between the +B cut relay and G403 (see «DASHBOARD WIRE HARNESS (VIEW OF MIDDLE TO PASSENGER'S SIDE)»(/acura/tl/iv-2008-2011/remont/body-electrical/#connectors-and-harnesses) ), then go to step 25 .
21. Jump the SCS line with the HDS.
22. Disconnect ECM connector A (49P).
23. Connect starter cut relay 1 4P connector terminal No. 4 to body ground with a jumper wire.
24. Check for continuity between ECM connector terminal A3 and body ground. Is there continuity? YES -Go to step 30 . NO -Repair open in the wire between the ECM (A3) and starter cut relay 1, then go to step 25.
25. Reconnect all connectors.
26. Press the engine start/stop button to select the ON mode.
27. Reset the ECM with the HDS.
28. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
29. 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, the +B cut relay, and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
30. Reconnect all connectors.
31. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, the +B cut relay, and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0615: Starter Cut Relay STR LD Circuit Malfunction (A/T)

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

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

Scheme 222

Scheme 223

Scheme 224

Scheme 225

1. Turn the ignition switch to ON (II), or press the engine start/stop button to the select the ON mode.
2. Check for Pending or Confirmed DTCs with the HDS. Are DTC P16BD and P0615 indicated at the same time? YES -Go to the troubleshooting for DTC P0616 (see «DTC P0616: STARTER RELAY 2 MALFUNCTION (A/T); DTC P16BD: STARTER CUT RELAY 2 MALFUNCTION (A/T)»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p16bd-starter-cut-relay-2) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Turn the ignition switch to START (III), or press the engine start/stop button to select the START mode, for 1 second or more.
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 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, and the PCM.
6. Try to start engine. Does the engine start? YES -Go to step 7. NO -Go to step 17 .
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 9. NO -Replace the fuse, then go to step 32 .
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector A (49P).
11. Remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
12. Connect starter cut relay 1 4P connector terminal No. 1 to body ground with a jumper wire.
13. Check for continuity between PCM connector terminal A28 and body ground. Is there continuity? YES -Go to step 36 . NO -Go to step 14.
14. Disconnect driver's under-dash fuse/relay box connector G(13P).
15. Connect driver's under-dash fuse/relay box connector G (13P) terminal No. 6 to body ground with a jumper wire.
16. 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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 31 . NO -Repair open in the wire between the PCM (A28) and the driver's under-dash fuse/relay box, then go to step 31 .
17. Turn the ignition switch to LOCK(O), or press the engine start/stop button to select the OFF mode.
18. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
19. Remove starter cut relay 2 (A) from the under-hood fuse/relay box.
20. Connect starter cut relay 1 4P connector terminal No. 4 to body ground with a jumper wire.
21. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
22. 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 23. NO -Go to step 27 .
23. Remove the jumper wire from the starter cut relay 1 4P connector.
24. Turn the ignition switch to LOCK (0).
25. Disconnect the transmission range switch 10P connector (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/tl/iv-2008-2011/remont/automatic-trans/#automatic-transmission) ).
26. At the switch side, check for continuity between transmission range switch 10P connector terminals No. 1 and No. 6 with the shift lever in N, and then in P. Is there continuity in each shift lever position? YES -Repair open in the wire between the transmission range switch and starter cut relay 1, starter cut relay 2, or G101, then go to step 31 . NO -Replace the transmission range switch (see «TRANSMISSION RANGE SWITCH REPLACEMENT»(/acura/tl/iv-2008-2011/remont/automatic-trans/#automatic-transmission) ), then go to step 31 .
27. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
28. Jump the SCS line with the HDS.
29. Disconnect PCM connector A (49P).
30. Check for continuity between PCM connector terminal A3 and body ground. Is there continuity? YES -Go to step 36 . NO -Repair open in the wire between the PCM (A3) and the starter cut relay 1, then go to step 31.
31. Reconnect all connecters.
32. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
33. Reset the PCM with the HDS.
34. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
35. 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
36. Reconnect all connectors.
37. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
38. 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 ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ), If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P062F: ECM/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0603 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 ECM/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 ECM/PCM with the HDS. Does the screen show 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 (see «DTC P062F: ECM/PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-p062f-ecmpcm-internal-control-module) ). 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
9. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0630 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 226

Scheme 227

Scheme 228

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 ECM/PCM and the connectors of these parts: Throttle body EGR valve 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 of these parts: Throttle body EGR valve 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 connecting each of these parts, one at a time: Throttle body EGR valve 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 ECM/PCM and the following parts, then go to step 1 and recheck. Throttle body EGR valve 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 ECM/PCM connectors A (49P), B (49P), and C (49P).
13. Check for continuity between body ground and ECM/PCM connector terminals A24, B18, and C12 individually. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM and the following parts, then go to step 1 and recheck. Throttle body EGR valve 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0641 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, check for poor connections or loose terminals at the ECM/PCM and the following parts, then go to step 1 and recheck. Throttle body EGR valve Input shaft (mainshaft) speed sensor APP sensor NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 229

Scheme 230

Scheme 231

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 ECM/PCM and the connectors of these parts: MAP sensor 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 of these parts: MAP sensor Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor
6. Turn the ignition switch to 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 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 ECM/PCM and the following parts, then go to step 1 and recheck. MAP sensor 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 ECM/PCM connectors A (49P), B (49P), and C (49P).
13. Check for continuity between body ground and ECM/PCM connector terminals A25, B36, and C11 individually. Is there continuity? YES -Repair short in the wire between the ECM/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 ECM/PCM with the HDS.
18. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM and the following parts, then go to step 1 and recheck. MAP sensor Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor If the connections and the terminals are OK, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0651 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, check for poor connections or loose terminals at the ECM/PCM and the following parts, then go to step 1 and recheck. MAP sensor Output shaft (countershaft) speed sensor IMT actuator APP sensor FTP sensor If the connections and the terminals are OK, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0685: ECM/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 if this DTC is stored intermittently, check for loose terminals at the IGP line connectors before replacing the ECM/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 10 . If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0715: Input Shaft (Mainshaft) Speed 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 232

Scheme 233

Scheme 234

Scheme 235

Scheme 236

Scheme 237

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
2. Test-drive several minutes.
3. Check the M SHAFT SPD in the DATA LIST with the HDS. Is any vehicle speed indicated? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. NO -Go to step 4.
4. Press the engine start/stop button to select the OFF mode.
5. Disconnect the input shaft (mainshaft) speed sensor 3P connector.
6. Press the engine start/stop button to select the ON mode.
7. Measure the voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 8. NO -Repair open in the wire between the ECM (C12) and the input shaft (mainshaft) speed sensor, then go to step 18 .
8. Measure the voltage between input shaft (mainshaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 9. NO -Go to step 10 .
9. Measure the voltage between input shaft (mainshaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 16 . NO -Repair open in the wire between the ECM (C16) and the input shaft (mainshaft) speed sensor, then go to step 18 .
10. Press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect ECM connector B (49P).
13. Check for continuity between ECM connector terminal B37 and body ground. Is there continuity? YES -Repair short in the wire between the ECM (B37) and the input shaft (mainshaft) speed sensor, then go to step 18 . NO -Go to step 14.
14. Connect input shaft (mainshaft) speed sensor 3P connector terminal No. 2 to body ground with a jumper wire.
15. Check for continuity between ECM connector terminal B37 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM (B37) and the input shaft (mainshaft) speed sensor, then go to step 18 .
16. Press the engine start/stop button to select the OFF mode.
17. Replace the input shaft (mainshaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__input-shaft-mainshaft-speed-sensor-replacement) ).
18. Reconnect all connectors.
19. Press the engine start/stop button to select the ON mode.
20. Reset the ECM with the HDS.
21. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in 5th Engine speed between 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0715 indicated? YES -Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P0715 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 23 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 22 .
25. Reconnect all connectors.
26. Update the ECM if does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or subsutitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in 5th Engine speed between 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
28. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0715 indicated? YES -Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 . If the ECM was substituted, go to step 1 . NO -Go to step 29.
29. Monitor the OBD STATUS for DTC P0715 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 28 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 . If the ECM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 27 .

DTC P0720: Output Shaft (Countershaft) Speed 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 238

Scheme 239

Scheme 240

Scheme 241

Scheme 242

Scheme 243

1. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.
2. Test-drive several minutes.
3. Check the C SHAFT SPD in the DATA LIST with the HDS. Is any vehicle speed indicated? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM. NO -Go to step 4.
4. Press the engine start/step button to select the OFF mode.
5. Disconnect the output shaft (countershaft) speed sensor 3P connector.
6. Press the engine start/stop button to select the ON mode.
7. Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 8. NO -Repair open in the wire between the ECM (B36) and the output shaft (countershaft) speed sensor, then go to step 18 .
8. Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 9. NO -Go to step 10 .
9. Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 16 . NO -Repair open in the wire between the ECM (B34) and the output shaft (countershaft) speed sensor, then go to step 18 .
10. Press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect ECM connector B (49P).
13. Check for continuity between ECM connector terminal B38 and body ground. Is there continuity? YES -Repair short in the wire between the ECM (B38) and the output shaft (countershaft) speed sensor, then go to step 18 . NO -Go to step 14.
14. Connect output shaft (countershaft) speed sensor 3P connector terminal No. 2 to body ground with a jumper wire.
15. Check for continuity between ECM connector terminal B38 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM (B38) and the output shaft (countershaft) speed sensor, then go to step 18 .
16. Press the engine start/stop button to select the OFF mode.
17. Replace the output shaft (countershaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__input-shaft-mainshaft-speed-sensor-replacement) ).
18. Reconnect ail connectors.
19. Press the engine start/stop button to select the ON mode.
20. Reset the ECM with the HDS.
21. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in 5th Engine speed between 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0720 indicated? YES -Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 23 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 22 .
25. Reconnect the all connectors.
26. Update the ECM if does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or subsutitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in 5th Engine speed between 2,000-3,000 rpm Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds
28. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0720 indicated? YES -Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 . If the ECM was substituted, go to step 1 . NO -Go to step 29.
29. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 28 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 27 . If the ECM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 27 .

DTC P0831: Clutch Pedal Position Switch A Circuit High Voltage

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

Scheme 244

1. Press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check the CLUTCH PEDAL POSITION SWITCH A in the DATA LIST with the HDS. Is CLOSE indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at clutch pedal position switch A and the ECM, and check the installation of clutch pedal position switch A.
4. Check clutch pedal position switch A. Is it damaged or loose? YES -Repair or replace clutch pedal position switch A, then go to step 11 . NO -Go to step 5.
5. Disconnect the clutch pedal position switch A 2P connector.
6. Check the CLUTCH PEDAL POSITION SWITCH A in the DATA LIST with the HDS. Is OPEN indicated? YES -Replace clutch pedal position switch A (see «CLUTCH PEDAL POSITION SWITCH A REPLACEMENT»(/acura/tl/iv-2008-2011/remont/starter/#starting-system) ), then go to step 11 . NO -Go to step 7.
7. Press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect ECM connector A (49P).
10. Check for continuity between the clutch pedal position switch A 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair short in the wire between clutch pedal position switch A and the ECM (A17), then go to step 11. NO -Go to step 16 .
11. Reconnect all connectors.
12. Press the engine start/stop button to select the ON mode.
13. Reset the ECM with the HDS.
14. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
15. Check the CLUTCH PEDAL POSITION SWITCH A in the DATA LIST with the HDS. Is CLOSE indicated? YES -Check for poor connections or loose terminals at clutch pedal position switch A and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
16. Reconnect all connectors.
17. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
18. Check the CLUTCH PEDAL POSITION SWITCH A in the DATA LIST with the HDS. Is DTC CLOSE indicated? YES -Check for poor connections or loose terminals at clutch pedal position switch A and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0835: Clutch Pedal Position Switch B Circuit Low Voltage

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

Scheme 245

Scheme 246

Scheme 247

1. Press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check the CLUTCH PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OPEN indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at clutch pedal position switch B and the ECM, and check the installation of the clutch pedal position switch B.
4. Check clutch pedal position switch B. Is it damaged or loose? YES -Repair or replace clutch pedal position switch B, then go to step 14 . NO -Go to step 5.
5. Disconnect the clutch pedal position switch B 3P connector.
6. Connect the clutch pedal position switch B 3P connector terminal No. 2 and No. 3 with a jumper wire.
7. Check the CLUTCH PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OPEN indicated? YES -Go to step 8. NO -Replace clutch pedal position switch B (see «CLUTCH PEDAL POSITION SWITCH B REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cruise-control-systems/#cruise-control-systems) ), then go to step 14 .
8. Connect the clutch pedal position switch B 3P connector terminal No. 2 to body ground with a jumper wire.
9. Check the CLUTCH PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OPEN indicated? YES -Go to step 10. NO -Repair open in the wire between clutch pedal position switch B and the G301 (see «LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH)»(/acura/tl/iv-2008-2011/remont/body-electrical/#connectors-and-harnesses__left-engine-compartment-wire-harness-engine) ), then go to step 14 .
10. Press the engine start/stop button to select the OFF mode.
11. Jump the SCS line with the HDS.
12. Disconnect ECM connector A (49P).
13. Check for continuity between ECM connector terminal A47 and body ground. Is there continuity? YES -Go to step 19 . NO -Repair open in the wire between clutch pedal position switch B and the ECM (A47), then go to step 14.
14. Reconnect all connectors.
15. Press the engine start/stop button to select the ON mode.
16. Reset the ECM with the HDS.
17. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check the CLUTCH PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OPEN indicated? YES -Check for poor connections or loose terminals at clutch pedal position switch B and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
19. Reconnect all connectors.
20. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
21. Check the CLUTCH PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OPEN indicated? YES -Check for poor connections or loose terminals at clutch pedal position switch B and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1116: ECT 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 ). 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 the terminals OK? YES -Go to step 2. NO -Repair the connectors or terminals, then go to step 22 .
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 108°F (42°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . 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 quickly in the DATA LIST with the HDS.
11. Compare the value of ECT SENSOR 1 to the ambient temperature. Does the value of ECT SENSOR 1 differ 5.4°F (3°C) or more from ambient temperature? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . 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 ECM/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 108°F (42°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 14.
14. Let the engine idle 10 minutes.
15. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 108°F (42°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 16.
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Allow the sensors to cool to the ambient temperature.
18. Note the ambient temperature.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
21. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensors 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 step 8 under «COOLANT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ), then go to step 22. 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 ECM/PCM.
22. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
23. Reset the ECM/PCM with the HDS.
24. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. 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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 a 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 (A/T in P or N, M/T in neutral) 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) Engine speed about 1,200 rpm or more A/T in D, M/T in 3rd Vehicle speed about 25 mph (40 km/h) or more under half throttle
6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 7. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM. If the screen 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 «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
12. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Engine speed about 1,200 rpm or more A/T in D, M/T in 3rd Vehicle speed about 25 mph (40 km/h) or more under half throttle
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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If the screen 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 (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
3. Check the MAP SENSOR in the DATA LIST with the HDS. Is there more than 36.9 kPa (1 LO 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) Engine speed between 1,200 and 5,900 rpm A/T in D, M/T in 5th Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds
6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 7. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the ECM/PCM. If the screen 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 «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
12. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
13. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Engine speed between 1,200 and 5,900 rpm A/T in D, M/T in 5th Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds
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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the ECM/PCM, then go to step 1 . If the screen 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 (A/T in P or N, M/T in neutral) 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 screen indicate FAILED? YES -Go to step 5. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING keep idling until a result comes on. If the screen 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 248

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminal A10 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. 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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 22 . If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 249

Scheme 250

Scheme 251

1. Start the engine, and let it idle.
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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 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 ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminal A10 and ELD 3P connector terminal No. 3. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/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 open in the wire between the ELD and G301 (see «LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH)»(/acura/tl/iv-2008-2011/remont/body-electrical/#connectors-and-harnesses__left-engine-compartment-wire-harness-engine) ), then go to step 13 .
12. Replace the ELD (see «ELD REPLACEMENT»(/acura/tl/iv-2008-2011/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 ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. 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 ECM/PCM, then go to step 17. NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
17. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
18. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 (A/T in P or N, M/T in neutral) 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine.
11. Check under these conditions: A/C off Headlights off Rear window defogger off
12. Hold the engine speed at 2,000 rpm (ATT in P or N, M/T in neutral) 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/tl/iv-2008-2011/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 Headlights on high beam Rear window defogger on
5. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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, and check the battery performance (see «BATTERY TEST»(/acura/tl/iv-2008-2011/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 the 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 engine harness. Is the harness OK? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/charging-system/#charging-system) ), then go to step 9. NO -Repair 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 ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 Headlights on high beam Rear window defogger on
14. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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/tl/iv-2008-2011/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 252

Scheme 253

Scheme 254

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 (II), 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 Headlights on high beam Rear window defogger on
6. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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 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/tl/iv-2008-2011/remont/charging-system/#charging-system) ), then go to step 17 . NO -Go to step 13.
13. Turn the ignition switch to LOCK(O), or press the engine start/stop button to select the OFF mode.
14. Jump the SCS line with the HDS.
15. Disconnect ECM/PCM connector C (49P).
16. Check for continuity between alternator 4P connector terminal No. 4 and ECM/PCM connector terminal C44. Is there continuity? YES -Go to step 26 . NO -Repair open in the wire between the ECM/PCM (C44) and the alternator, then go to step 18 .
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 ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Start the engine.
23. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Headlights on high beam Rear window defogger on
24. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
26. Reconnect all connectors.
27. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
28. Start the engine.
29. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Headlights on high beam Rear window defogger on
30. Hold the engine speed at 2,000 rpm (A/T in P or N, M/T in neutral) 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 28 . If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BD: Starter Cut Relay 2 Malfunction (M/T)

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

Scheme 255

Scheme 256

Scheme 257

Scheme 258

1. 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 and loose terminals at starter cut relay 1, starter cut relay 2, and the ECM.
4. Try to start engine. Does the engine start? YES -Go to step 5. NO -Go to step 13 .
5. Press the engine start/stop button to select the OFF mode.
6. 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 17 . NO -Go to step 7.
7. Remove the blown fuse the driver's under-dash fuse/relay box.
8. Jump the SCS line with the HDS.
9. Disconnect ECM connector A (49P).
10. Check for continuity between the ECM 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 22 .
11. Disconnect driver's under-dash fuse/relay box connector G (13P).
12. Check for continuity between the ECM connector terminal A28 and the body ground. Is there continuity? YES -Repair short in the wire between the ECM (A28) and the driver's under-dash fuse/relay box, then go to step 17 . NO -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 17 .
13. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 17 .
15. Disconnect driver's under-dash fuse/relay box connectors F (33P) and G (13P).
16. 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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 17. NO -Repair short in the wire between the driver's under-dash fuse/relay box and the under-hood fuse/relay box (starter cut relay 2), then go to step 17.
17. Reconnect all connectors.
18. Press the engine start/stop button to select the ON mode.
19. Reset the ECM with the HDS.
20. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
22. Reconnect all connectors.
23. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BD: Starter Cut Relay 2 Malfunction (A/T)

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

Scheme 259

Scheme 260

Scheme 261

Scheme 262

Scheme 263

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. 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 the body ground. Is there continuity? YES -Repair short in the wire between the ECM (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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 20 .
13. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 the starter cut relay 2 (A) from the 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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 20. NO -Repair short in the wire between the driver's under-dash fuse/relay box and the 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/tl/iv-2008-2011/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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC 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 ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BE: Starter Cut Relay 1 Malfunction (M/T)

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

Scheme 264

Scheme 265

Scheme 266

Scheme 267

1. 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 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 ECM.
4. Remove the No. 8 STRLD (7.5 A) fuse 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 -Go to step 13 .
6. Press the engine start/stop button to select the OFF mode.
7. Jump the SCS line with the HDS.
8. Disconnect ECM connector A (49P).
9. Press the engine start/stop button to select the ON mode.
10. Measure the voltage between ECM connector terminal A28 and body ground. Is there 3.0 V or more? YES -Go to step 11. NO -Reinstall the No. 8 STRLD (7.5 A) fuse, then go to step 23 .
11. Disconnect driver's under-dash fuse/relay box connector G (13P).
12. Measure the voltage between ECM connector terminal A28 and body ground. Is there 3.0 V or more? YES -Repair short to power in the wire between the driver's under-dash fuse/relay box and the ECM (A28), then go to step 18 . NO -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 18 .
13. Remove starter cut relay 1 from the driver's under-dash fuse/relay box.
14. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 3.0 V or more indicated? YES -Go to step 15. NO -Replace starter cut relay 1, then go to step 18 .
15. Press the engine start/stop button to select the OFF mode.
16. Disconnect under-dash fuse/relay box connector F (33P).
17. Measure the voltage between the starter cut relay 1 terminal No. 1 and body ground. Is there 3.0 V or more? YES -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 18. NO -Repair short to power in the wire between the driver's under-dash fuse/relay box and the under-hood fuse/relay box (starter cut relay 2), then go to step 18.
18. Reconnect all connectors.
19. Press the engine start/stop button to select the ON mode.
20. Reset the ECM with the HDS.
21. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1, starter cut relay 2, and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BE: Starter Cut Relay 1 Malfunction (A/T)

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

Scheme 268

Scheme 269

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/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 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/tl/iv-2008-2011/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/tl/iv-2008-2011/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 «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BF: Starter Cut Relay STRLY Circuit Malfunction (M/T)

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

Scheme 270

Scheme 271

Scheme 272

Scheme 273

Scheme 274

Scheme 275

Scheme 276

Scheme 277

Scheme 278

Scheme 279

1. Press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is ON indicated? YES -Go to step 4. NO -Go to step 21 .
4. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) )/then remove start cut relay 1 (A) from the driver's under-dash fuse/relay box.
5. Check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is ON indicated? YES -Go to step 6. NO -Replace starter cut relay 1, then go to step 34 .
6. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove the + B cut relay (A) from the relay holder.
7. Check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is ON indicated? YES -Go to step 8. NO -Replace the +B cut relay, then go to step 34 .
8. Press the engine start/stop button to select the OFF mode.
9. Disconnect driver's under-dash fuse/relay box connector N(16P).
10. Press the engine start/stop button to select the ON mode.
11. Measure the voltage between the + B cut relay 4P connector terminal No. 4 and body ground. Is there 1.0 V or more? YES -Go to step 12. NO -Repair short to power in the wire between the + B cut relay and the driver's under-dash fuse/relay box , then go to step 34 .
12. Press the engine start/stop button to select the OFF mode.
13. Disconnect driver's under-dash fuse/relay box connector G (13P).
14. Press the engine start/stop button to select the ON mode.
15. Measure the voltage between starter cut relay 1 4P connector terminal No. 4 and body ground. Is there 1.0 V or more? YES -Go to step 16. NO -Replace the driver's under-dash fuse/relay box (see «DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 34 .
16. Press the engine start/stop button to select the OFF mode.
17. Jump the SCS line with the HDS.
18. Disconnect ECM connector A (49P)
19. Press the engine start/stop button to select the ON mode.
20. Measure the voltage between ECM connector terminal A3 and body ground. Is there 1.0 V or more? YES -Repair short to power in the between the driver's under-dash fuse/relay box and the ECM (A3), then go to step 34 . NO -Go to step 39 .
21. While pressing the engine start/stop button to select the START mode, check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 22. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the starter cut relay 1, the +B cut relay, and the ECM.
22. Remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
23. While pressing the engine start/stop button to select the START mode, check the RSTRLYCNT in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 24. NO -Replace starter cut relay 1, then go to step 34 .
24. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove the + B cut relay (A) from the relay holder.
25. While pressing the engine start/stop button to select the START mode, check the STARTER RELAY CONTROL RETURN in the DATA LIST with the HDS, Is ON indicated? YES -Go to step 26. NO -Replace the + B cut relay, then go to step 34 .
26. Press the engine start/stop button to select the OFF mode.
27. Disconnect driver's under-dash fuse/relay box connector N (16P).
28. Check for continuity between +B cut relay terminal No. 4 and body ground. Is there continuity? YES -Repair short in the wire between the driver's under-dash fuse/relay box and the +B cut relay, then go to step 34 . NO -Go to step 29.
29. Disconnect driver's under-dash fuse/relay box connector G (13P).
30. Check for continuity between starter cut relay 1 terminal No. 4 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/INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-dash-fuserelay-box) ), then go to step 34 . NO -Go to step 31.
31. Jump the SCS line with the HDS.
32. Disconnect ECM connector A (49P).
33. Check for continuity between ECM connector terminal A3 and body ground. Is there continuity? YES -Repair short in the wire between the driver's under-dash fuse/relay box and the ECM (A3), then go to step 34. NO -Go to step 39 .
34. Reconnect all connectors.
35. Press the engine start/stop button to select the ON mode.
36. Reset the ECM with the HDS.
37. Do the ECM idle learn procedure, (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) )
38. 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, the + B cut relay, and the ECM, 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
39. Reconnect all connectors.
40. Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
41. 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, the +B cut relay, and the ECM. If the ECM was updated, substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM was substituted, go to step 1 . NO -If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BF: Starter Cut Relay STRLY Circuit Malfunction (A/T)

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

Scheme 280

Scheme 281

Scheme 282

Scheme 283

Scheme 284

Scheme 285

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 13 .
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, 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/tl/iv-2008-2011/remont/exteriorinterior-trim/#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 under-hood fuse/relay box.
9. Test the starter cut relays (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 10. NO -Replace the starter cut relay 1 and/or starter cut relay 2, then go to step 21 .
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector A (49P).
12. Check for continuity between PCM connector terminal A3 and body ground. Is there continuity? YES -Repair short in the wire between the PCM (A3) and starter cut relay 1 or starter cut relay 2, then go to step 21 . NO -Go to step 27 .
13. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
14. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove starter cut relay 1 (A) from the driver's under-dash fuse/relay box.
15. Remove starter cut relay 2 (A) from the under-hood fuse/relay box.
16. Test the starter cut relays (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 17. NO -Replace the starter cut relay 1 and/or starter cut relay 2, then go to step 21 .
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector A (49P).
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Measure the voltage between PCM connector terminal A3 and body ground. Is there 1.0 V or more? YES -Repair short to power in the wire between starter cut relay 1, starter cut relay 2, and the PCM (A3) then go to step 21. NO -Go to step 26 .
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/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. 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/tl/iv-2008-2011/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 «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
29. 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. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16E1: +B Cut Relay Circuit Malfunction

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

Scheme 286

Scheme 287

Scheme 288

1. 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 1.74 V or less indicated when the clutch pedal is pressed? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals at the + B cut relay, starter cut relay 2, and the ECM.
4. Remove the driver's dashboard under cover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove the +B cut relay (A).
5. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 1.74 V or less indicated only when clutch pedal is pressed? YES -Go to step 6. NO -Replace the +B cut relay, then go to step 10 .
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Remove starter cut relay 2 (A) from the under-hood fuse/relay box.
8. Press the engine start/stop button to select the ON mode.
9. Measure the voltage between starter cut relay 2 4P connector terminal No. 4 and body ground. Is there 1.0 V or less? YES -Replace starter cut relay 2, then go to step 10. NO -Repair short to power in the wire between the +B cut relay and the under-hood fuse/relay box (starter cut relay 2), then go to step 10.
10. Reconnect all connectors.
11. Press the engine start/stop button to select the ON mode.
12. Reset the ECM with the HDS.
13. Do the ECM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
14. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16E1 indicated? YES -Check for poor connections or loose terminals at the + B cut relay, starter cut relay 2, and the ECM, 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/tl/iv-2008-2011/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 22 .
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 120°F (49°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . 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 quickly 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Intermittent failure, the system is OK at this time. Reinstall the ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ). Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/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 120°F (49°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 14.
14. Let the engine idle 10 minutes.
15. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 120°F (49°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 16.
16. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
17. Allow the sensors to cool to the ambient temperature.
18. Note the ambient temperature.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
21. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensors 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 step 8 under «COOLANT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ), then go to step 22 . 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 ECM/PCM.
22. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
23. Reset the ECM/PCM with the HDS.
24. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. 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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 289

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/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 short in the wire between ECT sensor 2 and the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
16. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 290

Scheme 291

Scheme 292

Scheme 293

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 ECM/PCM.
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the 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 ECM/PCM connector A (49P).
15. Check for continuity between ECM/PCM connector terminal A27 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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 ECM/PCM connector A (49P).
19. Check for continuity between ECM/PCM connector terminal A21 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
25. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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, and 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 it dirty? YES -Remove the debris. If needed, replace the MAF sensor/IAT sensor (see «MAF SENSOR/IAT SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/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 disconnected from 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 ECM/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 ECM/PCM. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
11. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
14. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
15. Start the engine, and let it idle for 2 minutes.
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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 15 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 16 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 15 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 (A/T in P or N, M/T in neutral) 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) A/T in D, M/T in 4th Throttle position between 16 and 31 degrees for at least 3 seconds
6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 7. NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
7. Check the intake air system for clogging or the 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 ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th Throttle position between 16 and 31 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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 11 .
15. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
16. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
17. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) A/T in D, M/T in 4th Throttle position between 16 and 31 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 16 . If the ECM/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 screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 18 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 16 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 53 kPa (15.6 inHg, 397 mmHg), or 1.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2228 indicated? YES -Check for poor connections or loose terminals at the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 4.95 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2229 indicated? YES -Check for poor connections or loose terminals at the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 294

Scheme 295

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 5 and ECM/PCM connector terminal B31 (B32)*. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2237 and/or P2240* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2237 and/or P2240* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 296

Scheme 297

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between ECM/PCM connector terminal B31 (B32)* and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B31 (B32)*) and the A/F sensor (Sensor 1), then go to step 14 . NO -Go to step 10.
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2238 and/or P2241* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 298

Scheme 299

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 2 minutes.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2243 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 6 and ECM/PCM connector terminal B15(B24)*. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2243 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. Check for Pending or Confirmed DTCs with the HDS. If DTC P2243 and/or P2241* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2243 and/or P2247* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 300

Scheme 301

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between ECM/PCM connector terminal B15 (B24)* and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B15 (B24)*) and the A/F sensor (Sensor 1), then go to step 14 . NO -Go to step 10
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2245 and/or P2249* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. Check for Pending or Confirmed DTCs with the HDS. If DTC P2245 and/or P2249* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2245 and/or P2249* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 302

Scheme 303

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between A/F sensor (Sensor 1) 6P connector terminal No. 4 and ECM/PCM connector terminal B13(B14)*. Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 14 .
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2251 and/or P2254* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2251 and/or P2254* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen 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 304

Scheme 305

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 ECM/PCM.
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 6P connector.
8. Disconnect ECM/PCM connector B (49P).
9. Check for continuity between ECM/PCM connector terminal B13 (B14)* and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (B13 (B14)*) and the A/F sensor (Sensor 1), then go to step 14 . NO -Go to step 10.
10. Reconnect ECM/PCM connector B (49P).
11. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle for 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 20 . NO -Go to step 13.
13. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 and/or P2255* indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
23. Start the engine, and let it idle.
24. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P2252 and/or P2255* in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 24 , go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then go to step 23 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2610: ECM/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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .
4. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2610 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/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 (A/T in P or N, M/T in neutral) 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) A/T in D, M/T in 3rd 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 6 seconds
5. Monitor the OBD STATUS for DTC P2A00 and/or P2A03* in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 6. NO -If the screen 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 ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen 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/tl/iv-2008-2011/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 ECM/PCM with the HDS.
10. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/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) AT in D, M/T in 3rd 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 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 ECM/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 screen 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/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 11 .

DTC U0029: F-CAN Malfunction (BUS-OFF (ECM/PCM))

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 U0029 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0029 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0114: F-CAN Malfunction (ECM/PCM-SH-AWD Control Unit)

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

Scheme 306

Scheme 307

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 DTC U0029 and U0114 indicated at the same time? YES -Go to troubleshooting for DTC U0029 (see «DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM))»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-u0029-f-can-malfunction-bus-off-ecmpcm) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0114 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 SH-AWD control unit and the ECM/PCM.
5. Check for communication to the SH-AWD system with the HDS. Does the HDS communicate with the SH-AWD control unit? YES -Go to step 6. NO -Go to the SH-AWD symptom troubleshooting for the SH-AWD indicator does not go off, and no DTCs are stored (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential) ).
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 SH-AWD control unit connector A (20P).
9. Disconnect ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminals A48 and SH-AWD control unit connector A (20P) terminal No. 10. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A48) and the SH-AWD control unit, then go to step 12 .
11. Check for continuity between ECM/PCM connector terminal A49 and SH-AWD control unit connector A (20P) terminal No. 20. Is there continuity? YES -Update the SH-AWD control unit if it does not have the latest software (see «SH-AWD CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-update) ), or substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 12 and recheck. If DTC U0114 is not indicated after substitution, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), then go to step 12. NO -Repair open in the wire between the PCM (A49) and the SH-AWD control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0114 indicated? YES -Check for poor connections or loose terminals at the SH-AWD control unit and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0122: F-CAN Malfunction (ECM/PCM-VSA Modulator-Control Unit)

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

Scheme 308

Scheme 309

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 DTC U0029 and U0122 indicated at the same time? YES -Go to the troubleshooting for DTC U0029 (see «DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM))»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-u0029-f-can-malfunction-bus-off-ecmpcm) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0122 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 VSA modulator-control unit and the ECM/PCM.
5. Check for communication to the VSA system with the HDS. Does the HDS communicate with the VSA modulator-control unit? YES -Go to step 6. NO -Go to the VSA symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off (see «ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
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 VSA modulator-control unit 47P connector.
9. Disconnect ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminal A48 and VSA modulator-control unit 47P connector terminal No. 12. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A48) and the VSA modulator-control unit, then go to step 12 .
11. Check for continuity between ECM/PCM connector terminal A49 and VSA modulator-control unit 47P connector terminal No. 13. Is there continuity? YES -Update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-update) ), or substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12 and recheck. If DTC U0122 is not indicated after substitution, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12. NO -Repair open in the wire between the ECM/PCM (A49) and the VSA modulator-control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0122 indicated? YES -Check for poor connections or loose terminals at the VSA modulator-control unit and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0131: F-CAN Malfunction (ECM/PCM-EPS Control Unit)

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

Scheme 310

Scheme 311

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 DTC U0029 and U0131 indicated at the same time? YES -Go to the troubleshooting for DTC U0029 (see «DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM))»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dtc-u0029-f-can-malfunction-bus-off-ecmpcm) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0131 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 EPS control unit, and the ECM/PCM.
5. Check for communication the EPS system with the HDS. Does the HDS communicate with the EPS control unit? YES -Go to step 6. NO -Go to the symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ).
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 EPS control unit connector D (28P).
9. Disconnect ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminal A48 and EPS control unit connector D (28P) terminal No. 1. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A48) and the EPS control unit, then go to step 12 .
11. Check for continuity between ECM/PCM connector terminal A49 and EPS control unit connector D (28P) terminal No. 15. Is there continuity? YES -Substitute a known-good EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ), then go to step 12 and recheck. If DTC U0131 is not indicated, replace the original EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ), then go to step 12. NO -Repair open in the wire between the ECM/PCM (A49) and the EPS control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0131 indicated? YES -Check for poor connections or loose terminals at the EPS control unit and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0155: F-CAN Malfunction (ECM/PCM-Gauge Control Module)

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

Scheme 312

Scheme 313

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 U0155 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 gauge control module and the ECM/PCM.
4. Check for body electrical DTCs in the DTCs MENU with the HDS. Is DTC U0029 and/or U0100 indicated? YES -Go to step 5. NO -Do the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-input-test) ).
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. Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
8. Disconnect the gauge control module 32P connector.
9. Disconnect ECM/PCM connector A (49P).
10. Check for continuity between ECM/PCM connector terminal A48 and gauge control module 32P connector terminal No. 10. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A48) and the gauge control module, then go to step 12 .
11. Check for continuity between ECM/PCM connector terminal A49 and gauge control module 32P connector terminal No. 9. Is there continuity? YES -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ), then go to step 12 and recheck. If DTC U0155 is not indicated after substitution, replace the original gauge control module, then go to step 12. NO -Repair open in the wire between the ECM/PCM (A49) and the gauge control module, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
14. Reset the ECM/PCM with the HDS.
15. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0155 indicated? YES -Check for poor connections or loose terminals at the gauge control module and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) .

Scheme 314

Scheme 315

Scheme 316

Scheme 317

Scheme 318

Scheme 319

Scheme 320

Scheme 321

Scheme 322

Scheme 323

Scheme 324

Scheme 325

Scheme 326

Scheme 327

Scheme 328

Scheme 329

Scheme 330

Scheme 331

Scheme 332

Scheme 333

Scheme 334

Scheme 335

Scheme 336

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Jump the SCS line with the HDS.
3. Disconnect ECM/PCM connector A (49P).
4. Measure the resistance between ECM/PCM connector terminals A48 and A49, then compare your reading to the model/trim level listed below. Vehicles without SH-AWD: TERMINAL RESISTANCE REFERENCE CHART Other Systems Resistance Navigation and keyless access system (USA model) About 79-96 ohms Navigation and keyless access system (Canada model) About 82-100 ohms Keyless access system About 85-103 ohms Without the above systems About 88-107 ohms Vehicles with SH-AWD: TERMINAL RESISTANCE REFERENCE CHART Other Systems Resistance Navigation and keyless access system (USA model) About 74-90 ohms Navigation and keyless access system (Canada model) About 76-93 ohms Without the above systems About 88-107 ohms Is the value of resistance OK? YES -Go to step 47 . NO -Go to step 5.
5. Disconnect these connectors: Gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ). VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). EPS control unit connector D (28P) (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ). SH-AWD control unit connector A (20P) (with SH-AWD) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). Yaw rate-lateral acceleration sensor 5P connector (without SH-AWD) (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Yaw rate-lateral/longitudinal acceleration sensor 5P connector (with SH-AWD) (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Steering angle sensor 5P connector (with SH-AWD) (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). SRS unit connector A (39P) (see «SRS UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ). TPMS control unit 20P connector (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). Power control unit connector C (36P) (with keyless access) (see «POWER CONTROL UNIT»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ). Audio-Navigation unit connector H (28P) (with navigation) (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ). AcuraLink control unit connector A (32P) (USA model with navigation) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ).
6. Check for continuity between ECM/PCM connector terminals A48 and A49. Is there continuity? YES -Repair short in the wires between ECM/PCM connector terminals A48 and A49. NO -Go to step 7.
7. Check for continuity between ECM/PCM connector terminals A48 and gauge control module 32P connector terminal No. 10. Is there continuity? YES -Go to step 8. NO -Repair open in the wire between the ECM/PCM (A48) and the gauge control module.
8. Check for continuity between ECM/PCM connector terminals A48 and VSA modulator-control unit 47P connector terminal No. 12. Is there continuity? YES -Go to step 9. NO -Repair open in the wire between the ECM/PCM (A48) and the VSA modulator-control unit.
9. Check for continuity between ECM/PCM connector terminals A48 and EPS control unit connector D (28P) terminal No. 1. Is there continuity? YES - With SH-AWD: Go to step 10. Without SH-AWD: Go to step 11 . NO -Repair open in the wire between the ECM/PCM (A48) and the EPS control unit.
10. Check for continuity between ECM/PCM connector terminals A48 and SH-AWD control unit connector A (20P) terminal No. 10. Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A48) and the SH-AWD control unit.
11. Check for continuity between ECM/PCM connector terminals A49 and gauge control module 32P connector terminal No. 9. Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the ECM/PCM (A49) and the gauge control module.
12. Check for continuity between ECM/PCM connector terminals A49 and VSA modulator-control unit 47P connector terminal No. 13. Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the ECM/PCM (A49) and the VSA modulator-control unit.
13. Check for continuity between ECM/PCM connector terminals A49 and EPS control unit connector D (28P) terminal No. 15. Is there continuity? YES - With SH-AWD: Go to step 14. Without SH-AWD: Go to step 15 . NO -Repair open in the wire between the ECM/PCM (A49) and the EPS control unit.
14. Check for continuity between ECM/PCM connector terminals A49 and SH-AWD control unit connector A (20P) terminal No. 20. Is there continuity? YES -Go to step 15. NO -Repair open in the wire between the ECM/PCM (A49) and the SH-AWD control unit.
15. Reconnect the gauge control module 32P connector.
16. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES -Go to step 17. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
17. Disconnect the gauge control module 32P connector.
18. Reconnect the VSA modulator-control unit 47P connector.
19. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 108-132 ohms? YES -Go to step 20. NO -Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ).
20. Disconnect the VSA modulator-control unit 47P connector.
21. Reconnect EPS control unit connector D (28P).
22. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2,34-2.86 kohms? YES - With SH-AWD system: Go to step 23. Without SH-AWD system: Disconnect EPS control unit connector D (28P), then go to step 27 . NO -Substitute a known-good EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ).
23. Disconnect EPS control unit connector D (28P).
24. Reconnect SH-AWD control unit connector A (20P).
25. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES -Go to step 26. NO -Substitute a known-good SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ).
26. Reconnect SH-AWD control unit connector A (20P).
27. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector (with SH-AWD) or the yaw rate-lateral acceleration sensor 5P connector (without SH-AWD).
28. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - With SH-AWD system: Go to step 29, Without SH-AWD system: Disconnect the yaw rate-lateral acceleration sensor, then go to step 33 . NO -Substitute a known-good yaw rate-lateral/longitudinal acceleration sensor (with SH-AWD) (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ) or yaw rate-lateral acceleration sensor (without SH-AWD) (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original yaw rate-lateral/longitudinal acceleration sensor (with SH-AWD) (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ) or yaw rate-lateral acceleration sensor (without SH-AWD) (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
29. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector.
30. Reconnect the steering angle sensor 5P connector.
31. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES -Go to step 32. NO -Substitute a known-good steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ).
32. Disconnect the steering angle sensor 5P connector.
33. Reconnect SRS unit connector A (39P).
34. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES -Go to step 35. NO -Substitute a known-good SRS unit (see «SRS UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original SRS unit (see «SRS UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ).
35. Disconnect SRS unit connector A (39P).
36. Reconnect the TPMS control unit 20P connector.
37. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - With keyless access: Go to step 38. Without keyless access: Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Substitute a known-good TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
38. Disconnect the TPMS control unit 20P connector.
39. Reconnect power control unit connector C (36P).
40. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - With navigation system: Go to step 41. Without navigation system: Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Substitute a known-good power control unit (see «POWER CONTROL UNIT»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original power control unit (see «POWER CONTROL UNIT»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ).
41. Disconnect power control unit connector C (36P).
42. Reconnect audio-navigation unit connector H (28P).
43. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES - USA model (with AcuraLink): Go to step 44. Canada model (without AcuraLink): Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Substitute a known-good audio-navigation unit (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ), and reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original audio-navigation unit (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ).
44. Disconnect audio-navigation unit connector H (28P).
45. Reconnect AcuraLink control unit connector A (32P).
46. Measure the resistance between ECM/PCM connector terminals A48 and A49. Is there about 2.34-2.86 kohms? YES -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Substitute a known-good AcuraLink control unit (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ), then reconnect ECM/PCM connector A (49P). If the HDS identifies the vehicle, replace the original AcuraLink control unit (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ).
47. Disconnect these connectors: Gauge control module 32P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ). VSA modulator-control unit 47P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). EPS control unit connector D (28P) (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ). SH-AWD control unit connector A (20P) (with SH-AWD) (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). Yaw rate-lateral acceleration sensor 5P connector (without SH-AWD) (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Yaw rate-lateral/longitudinal acceleration sensor 5P connector (with SH-AWD) (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). Steering angle sensor 5P connector (with SH-AWD) (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). SRS unit connector A (39P) (see «SRS UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ). TPMS control unit 20P connector (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). Power control unit connector C (36P) (with keyless access) (see «POWER CONTROL UNIT»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ). Audio-navigation unit connector H (28P) (with navigation) (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ). AcuraLink control unit connector A (32P) (USA model with navigation) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ).
48. Check for continuity between ECM/PCM connector terminal A48 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM terminals A48 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral/longitudinal acceleration sensor (with SH-AWD), the yaw rate-lateral acceleration sensor (without SH-AWD), the EPS control unit, the SH-AWD control unit (with SH-AWD), the steering angle sensor (with SH-AWD), the SRS unit, the TPMS control unit, the audio-navigation unit (with navigation), the AcuraLink control unit (USA model with navigation), the power control unit (with keyless access), or the DLC. NO -Go to step 49.
49. Check for continuity between ECM/PCM connector terminal A49 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM terminals A49 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral/longitudinal acceleration sensor (with SH-AWD), the yaw rate-lateral acceleration sensor (without SH-AWD), the EPS control unit, the SH-AWD control unit (with SH-AWD), the steering angle sensor (with SH-AWD), the SRS unit, the TPMS control unit, the audio-navigation unit (with navigation), the AcuraLink control unit (USA model with navigation), the power control unit (with keyless access), or the DLC. NO -Go to step 50.
50. Reconnect all connectors.
51. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
52. Disconnect the gauge control module 32P connector.
53. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ). NO -Go to step 54.
54. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
55. Reconnect the gauge control module 32P connector.
56. Disconnect the VSA modulator-control unit 47P connector.
57. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 58.
58. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
59. Reconnect the VSA modulator-control unit 47P connector.
60. Disconnect EPS control unit connector D (28P).
61. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ). NO - With SH-AWD: Go to step 62. Without SH-AWD: Turn the ignition switch to LOCK (0), or press the engine start/stop button to select OFF mode, then reconnect EPS control unit connector D (28P), and go to step 68 .
62. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
63. Reconnect EPS control unit connector D (28P).
64. Disconnect SH-AWD control unit connector A (20P).
65. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the SH-AWD control unit (see «SH-AWD CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential__sh-awd-control-unit-replacement) ). NO -Go to step 66.
66. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
67. Reconnect SH-AWD control unit connector A (20P).
68. Disconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector (with SH-AWD) or the yaw rate-lateral acceleration sensor 5P connector (without SH-AWD).
69. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the yaw rate-lateral/longitudinal acceleration sensor (see «YAW RATE-LATERAL/LONGITUDINAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ) or the yaw rate-lateral acceleration sensor (see «YAW RATE-LATERAL ACCELERATION SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ). NO - With SH-AWD: Go to step 70. Without SH-AWD: Turn the ignition switch to LOCK (0), or press the engine start/stop button to select OFF mode, then reconnect yaw rate-lateral accerelation sensor 5P connector, then go to step 76 .
70. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
71. Reconnect the yaw rate-lateral/longitudinal acceleration sensor 5P connector.
72. Disconnect the steering angle sensor 5P connector.
73. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components__steering-angle-sensor-replacement) ). NO -Go to step 74.
74. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
75. Reconnect the steering angle sensor 5P connector.
76. Disconnect SRS unit connector A (39P).
77. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the SRS unit (see «SRS UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ). NO -Go to step 78.
78. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
79. Reconnect SRS unit connector A (39P).
80. Disconnect the TPMS control unit 20P connector.
81. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). NO - With keyless access: Go to step 82. Without keyless access: Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
82. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
83. Reconnect the TPMS control unit 20P connector.
84. Disconnect power control unit connector C (36P).
85. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the power control unit (see «POWER CONTROL UNIT»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ). NO - With navigation: Go to step 86. Without navigation: Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
86. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
87. Reconnect power control unit connector C (36P).
88. Disconnect audio-navigation unit connector H (28P).
89. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the audio-navigation unit (see «AUDIO UNIT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ). NO - USA model (with AcuraLink): Go to step 90. Canada model (without AcuraLink): Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
90. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
91. Reconnect audio-navigation unit connector H (28P).
92. Disconnect AcuraLink control unit connector A (32P).
93. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Replace the AcuraLink control unit (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/entertainment-systems/#audio-system) ). NO -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the HDS identifies the vehicle and the ECM/PCM was updated, troubleshooting is complete. If the HDS identifies the vehicle and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).

Scheme 337

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/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ). Does the MIL indicator 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/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__gauge-control-module-replacement) ).
3. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Disconnect ECM/PCM connector A (49P), then disconnect the HDS.
7. Check for continuity between ECM/PCM connector terminal A32 and body ground. Is there continuity? YES -Repair short in the wire between the ECM/PCM (A32) and the DLC. NO -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).

DLC Circuit Troubleshooting

Note. If you suspect the HDS or the HDS DLC cable may be the source of the communication problem, verify that they are working properly by connecting them to a known-good, like vehicle and system, and checking for communication problem.

Scheme 338

Scheme 339

Scheme 340

Scheme 341

Scheme 342

Scheme 343

Scheme 344

Scheme 345

Scheme 346

Scheme 347

Scheme 348

Scheme 349

Scheme 350

Scheme 351

Scheme 352

Scheme 353

Scheme 354

Scheme 355

Scheme 356

Scheme 357

Scheme 358

Scheme 359

Scheme 360

Scheme 361

Scheme 362

Scheme 363

1. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
2. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ). NOTE: Make sure the HDS is properly connected to the DLC.
3. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and read the HDS. Does the HDS identify the vehicle? YES -Go to step 4. NO -Go to step 27 .
4. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS. Are any Pending or Confirmed DTCs indicated? YES -Go to the «INDICATED DTC'S TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO - If the HDS does not communicate with the SRS, go to step 5. If the HDS does not communicate with the VSA system, go to step 7 . If the HDS does not communicate with the EPS, go to step 9 . If the HDS does not communicate with the SH-AWD system, go to step 11 . If the HDS does not communicate with the TPMS, go to step 13 . If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 15 . If the HDS does not communicate with the ONE PUSH START system, go to step 17 . If the HDS does not communicate with the BODY ELECTRICAL system, go to step 19 .
5. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
6. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and watch the SRS indicator. Does the SRS indicator come on and go off? YES -Go to step 21 . NO -Go to the SRS general troubleshooting information (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/airbag/#srs-supplemental-restraint-system) ).
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and watch the VSA indicator. Does the VSA indicator come on and go off? YES -Go to step 21 . NO -Go to the symptom troubleshooting for ABS indicator, brake system indicator, VSA indicator do not go off (see «ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF»(/acura/tl/iv-2008-2011/remont/anti-locktraction-control/#vsa-vehicle-stability-assist-system-components) ).
9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
10. Start the engine, and watch the EPS indicator. Does the EPS indicator come on and go off? YES -Go to step 21 . NO -Go to the troubleshooting for EPS indicator does not go off, and no DTCs are stored (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/electronic-steering/#power-steering-system) ).
11. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and watch the SH-AWD indicator. Does the SH-AWD indicator come on and go off? YES -Go to step 21 . NO -Go to the symptom troubleshooting for SH-AWD indicator does not go off, and no DTCs are stored (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/differentials-drive-axles/#rear-differential) ).
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), and watch the TPMS indicator. Does the TPMS indicator come on and go off? YES -Go to step 21 . NO -Go to the symptom troubleshooting for TPMS indicator does not go off, and no DTCs are stored (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system) ).
15. Turn the ignition switch to LOCK(0), or press the engine start/stop button to select the OFF mode.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES -Go to the immobilizer system's troubleshooting; without keyless access (see «SYMPTOM TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#immobilizer-system__symptom-troubleshooting) ), with keyless access (see «SYMPTOM TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system__symptom-troubleshooting-information) ). NO -Go to step 21 .
17. Press the engine start/stop button to select the OFF mode.
18. Press the engine start/stop button to select the ON mode, and watch the keyless access indicator. Does the keyless access indicator stay on? YES -Go to the keyless access system general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/door-locks-anti-theft-systems/#keyless-access-system) ). NO -Go to step 21 .
19. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tl/iv-2008-2011/remont/gauges-instrument-panels/#display-and-gauge-system__self-diagnostic-function) ).
20. Check the gauge display. Is B-CAN--ERROR indicated? YES -Check for B-CAN system DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/communication-devices/#multiplex-integrated-control-system) ). NO -Go to step 21.
21. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
22. Disconnect the HDS from the DLC.
23. Check for continuity between DLC terminal No. 7 and body ground (with keyless access; between body ground and DLC terminals No. 1 and No. 7 individually). Is there continuity? YES -Go to step 24. NO -Go to step 25 .
24. Continue to check for continuity between DLC terminal No. 7 and body ground (with keyless access; between body ground and DLC terminals No. 1 and No. 7 individually), while disconnecting these connectors, one at a time: SRS unit connector A (39P) VSA modulator-control unit 47P connector EPS control unit connector D (28P) SH-AWD control unit connector A (20P) (with SH-AWD) TPMS control unit 20P connector Immobilizer-keyless control unit 7P connector (without keyless access) Audio unit connector A (24P) (without navigation) Audio-navigation unit connector A (24P) (with navigation) Driver's under-dash fuse/relay box connector ohms (20P) Remote slot control unit 40P connector (with keyless access) Keyless access control unit connector B (32P) (with keyless access) Power control unit connector C (36P) (with keyless access) Does continuity go away when one of the above connectors is disconnected? YES -Replace the part that caused continuity go away when it was disconnected. NO -Repair short in the wire between the DLC No. 7 (K-Line) and the VSA modulator-control unit, the EPS control unit, the SH-AWD control unit, the SRS unit, the TPMS control unit, the immobilizer-keyless control unit, the audio unit, the audio-navigation unit, the driver's under-dash fuse/relay box, the remote slot control unit, or the keyless access control unit the DLC No. 1 (Diag-H line) and the power control unit (with keyless access).
25. Connect DLC terminal No. 7 to body ground with a jumper wire (with keyless access system; and connect DLC terminal No. 1 to body ground with a jumper wire).
26. Check for continuity between body ground and these connector terminals: CONTINUITY TERMINAL REFERENCE CHART Connector Terminal SRS unit A (39P) No. 18 (LT BLU) VSA modulator-control unit 47P No. 10 (LT BLU) EPS control unit D (28P) No. 17 (LT BLU) SH-AWD control unit A (20P) (with SH-AWD) No. 5 (LT BLU) TPMS control unit 20P No. 7 (LT BLU) Immobilizer-keyless control unit 7P (without keyless access) No. 5 (LT BLU) Audio unit A (24P) (without navigation) No. 3 (LT BLU) Audio-navigation unit connector A (24P) (with navigation) No. 3 (LT BLU) Driver's under-dash fuse/relay box ohms (20P) No. 16 (LT BLU) Remote slot control unit 40P (with keyless access) No. 34 (LT BLU) Keyless access control unit B (32P) (with keyless access) No. 4 (LT BLU) Power control unit C (36P) (with keyless access) No. 3 (GRY) Is there continuity between the body ground and each of the terminals in the chart? YES -Replace the part that does not communicate with the HDS. NO -Repair open in the wire between the DLC (K-Line or Diag-H) and the appropriate connector.
27. Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/communication-devices/#multiplex-integrated-control-system) ). Is DTC U0029 and/or U0100 indicated? YES -Go to step 38 . NO -Go to step 28.
28. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
29. Disconnect the HDS from the DLC.
30. Measure the voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES -Go to step 31. NO -Repair open in the wire between DLC terminal No. 16 and the No. 15 BACK UP (10 A) fuse in the under-hood fuse/relay box.
31. Measure the voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES -Go to step 32. NO -Repair open in the wire between DLC terminal No. 4 and body ground (G401 (see «DASHBOARD WIRE HARNESS (VIEW OF DRIVER'S SIDE)»(/acura/tl/iv-2008-2011/remont/body-electrical/#connectors-and-harnesses) ).
32. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
33. Jump the SCS line with the HDS.
34. Disconnect ECM/PCM connector A (49P).
35. Disconnect the HDS from the DLC.
36. Check for continuity between ECM/PCM connector terminal A48 and DLC terminal No. 6. Is there continuity? YES -Go to step 37. NO -Repair open in the wire between the ECM/PCM (A48) and DLC terminal No. 6.
37. Check for continuity between ECM/PCM connector terminal A49 and DLC terminal No. 14. Is there continuity? YES -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Repair open in the wire between the ECM/PCM (A49) and DLC terminal No. 14.
38. Try to start the engine. Does the engine start and idle? YES -Go to the «F-CAN CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system) . NO - If the starter does not crank, go to step 39. If the starter cranks, turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode; and go to step 41 .
39. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
40. Check the No. 3-1 IG MAIN (50 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Repair 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 41. NO -Repair 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.
41. Inspect the No. 17 Fl MAIN (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 48 . NO -Go to step 42.
42. Remove the blown No. 17 Fl MAIN (15 A) fuse from the under-hood fuse/relay box.
43. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
44. 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/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 17 Fl MAIN (15 A) fuse. NO -Go to step 45.
45. 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 ECM/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 ECM/PCM, update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). Also replace the No. 17 FI MAIN (15 A) fuse. NO -Go to step 46.
46. Disconnect the connectors from these components: 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
47. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair 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.
48. 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 62 . NO -Go to step 49.
49. Remove the blown No. 9 FUEL PUMP (20 A) fuse from the driver's under-dash fuse/relay box.
50. Remove the driver's dashboard undercover (see «DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/exteriorinterior-trim/#dashboard) ), then remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
51. Test PGM-FI main relay 2 (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-test) ). Is the relay OK? YES -Go to step 52. NO -Replace PGM-FI main relay 2. Also replace the No. 9 FUEL PUMP (20 A) fuse.
52. Check for continuity between PGM-FI main relay 2 4P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 53. NO - '09 model without SH-AWD, 2010 - '11 model: Go to step 56 . '09 model with SH-AWD: Go to step 60 .
53. Jump the SCS line with the HDS.
54. Disconnect ECM/PCM connector B (49P).
55. Check for continuity between ECM/PCM connector terminal B42 and body ground. Is there continuity? YES -Repair short in the wire between the No. 9 FUEL PUMP (20 A) fuse and the ECM/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 ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ).
56. Remove the rear seat cushion (see «REAR SEAT REMOVAL/INSTALLATION»(/acura/tl/iv-2008-2011/remont/seats/#seats__rear-seat-removalinstallation) ).
57. Remove the access panel from the floor (see «FUEL TANK UNIT REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__fuel-tank-unit-removal-and-installation) ).
58. Disconnect the fuel pump 4P connector.
59. Check for continuity between fuel pump 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair short in the wire between the fuel pump and PGM-FI main relay 2. Also replace the No. 9 FUEL PUMP (20 A) fuse. NO -Check the fuel pump, and replace it if needed (see «FUEL PUMP/FUEL GAUGE SENDING UNIT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ). Also replace the No. 9 FUEL PUMP (20 A) fuse.
60. Disconnect the fuel pump control module 10P connector (see «FUEL PUMP CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ).
61. Check for continuity between fuel pump control module 10P connector terminal No. 3 and body ground. Is there continuity? YES -Repair 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/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), then recheck. If the symptom/indication goes away with a known-good fuel pump control module, replace the fuel pump control module (see «FUEL PUMP CONTROL MODULE REPLACEMENT»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ).
62. Jump the SCS line with the HDS.
63. Disconnect ECM/PCM connectors A (49P) and B (49P).
64. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
65. Measure the voltage between ECM/PCM connector terminal B42 and body ground. Is there battery voltage? YES -Go to step 66. NO -Repair open in the wire between the No. 9 FUEL PUMP (20 A) fuse and the ECM/PCM (B42).
66. Measure the voltage between ECM/PCM connector terminal A6 and body ground. Is there battery voltage? YES -Go to step 71 . NO -Go to step 67.
67. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
68. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
69. 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 70. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ).
70. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 3 and ECM/PCM connector terminal A6. Is there continuity? YES -Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication goes away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Repair open in the wire between the ECM/PCM (A6) and PGM-FI main relay 1.
71. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
72. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
73. 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 74. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/body-electrical/#under-hood-fuserelay-box__removal-and-installation) ).
74. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and ECM/PCM connector terminal B3. Is there continuity? YES -Go to step 75. NO -Repair open in the wire between the ECM/PCM (B3) and PGM-FI main relay 1.
75. Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/tl/iv-2008-2011/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 76. NO -Replace PGM-FI main relay 1.
76. Disconnect ECM/PCM connectors A (49P), B (49P), and C (49P).
77. Check for continuity between body ground and ECM/PCM connector terminals A41, B1, B40, B41, C1, and C41 individually. Is there continuity? YES -Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems__substituting-the-ecmpcm) ), then recheck. If the symptom/indication goes away and the ECM/PCM was updated, troubleshooting is complete. If the symptom/indication gose away and the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-replacement) ). NO -Repair open in the wire(s) between the PCM (A41, B1, B40, B41, C1, C41) and body ground (G101).

Scheme 364

Scheme 365

1. Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the quick-connect fitting (A).
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 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 injector O-rings (green) (E) with clean engine oil.
13. Install the fuel rails and the injectors in the injector base (F).
14. Install the fuel rail mounting bolts, and connect the injector connectors.
15. Install the fuel joint hose mounting bolt.
16. Connect the quick-connect fitting; without SH-AWD (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ), with SH-AWD (see «FUEL LINE/QUICK-CONNECT FITTING REMOVAL»(/acura/tl/iv-2008-2011/remont/fuel-system/#fuel-supply-system) ).
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. Install the intake manifold with a new gasket (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).

Scheme 366

1. Disconnect the MAP sensor connector (A).
2. Remove the screw (B).
3. Remove the MAP sensor (C).
4. Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 367

1. Disconnect the MAF sensor/IAT sensor 5P connector (A).
2. Remove the screws (B).
3. Remove the MAF sensor/IAT sensor (C).
4. Install the parts in the reverse order of removal with a new O-ring (D).

Scheme 368

1. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ).
2. Disconnect the ECT sensor 1 2P connector (A).
3. Remove ECT sensor 1 (B).
4. Install the parts in the reverse order of removal with a new O-ring (C), then refill the radiator with engine coolant (see «COOLANT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ).

Scheme 369

1. Remove the splash shield.
2. Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#cooling-system) ).
3. Disconnect the ECT sensor 2 2P 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 REPLACEMENT»(/acura/tl/iv-2008-2011/remont/cooling-system-mechanical/#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 370

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.

Scheme 371

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 372

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

Scheme 373

Scheme 374

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

Scheme 375

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

Scheme 376

Scheme 377

1. Remove the timing belt (see «TIMING BELT REMOVAL»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6) ).
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. Install the timing belt (see «TIMING BELT INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#cylinder-head-j35z6__timing-belt-installation) ).
6. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

Scheme 378

1. Raise the vehicle on a lift. NOTE: Make 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/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).
7. Check for engine oil level, and add more oil if needed.

Scheme 379

1. Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
2. Remove the injector base (see «INJECTOR BASE REMOVAL AND INSTALLATION»(/acura/tl/iv-2008-2011/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the knock sensor connector (A).
4. Remove the knock sensor (B).
5. Install the parts in the reverse order of removal.

Input Shaft (Mainshaft) Speed Sensor Replacement

Note. For A/T models (see INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT ).

Scheme 380

1. Raise the vehicle on a lift.
2. Remove the splash shield.
3. Disconnect the input shaft (mainshaft) speed sensor connector (A).
4. Remove the input shaft (mainshaft) speed sensor (B).
5. Install the parts in the reverse order of removal with a new O-ring (C).
6. If needed, refill the manual transmission fluid (see «TRANSMISSION FLUID INSPECTION AND REPLACEMENT»(/acura/tl/iv-2008-2011/remont/manual-trans/#manual-transmission__transmission-fluid-inspection-and-replacement) ).

Output Shaft (Countershaft) Speed Sensor Replacement

Note. For A/T models (see OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT ).

Scheme 381

1. Raise the vehicle on a lift.
2. Remove the splash shield.
3. Disconnect the output shaft (countershaft) speed sensor connector (A).
4. Remove the output shaft (countershaft) speed sensor (B).
5. Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 382

Scheme 383

Scheme 384

Scheme 385

1. Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ).
2. Remove the upper cover (A), then remove the two positive (+) terminals (B).
3. Remove the under-hood fuse/relay box (C) from the bracket.
4. Remove the lower cover (A). A
5. Disconnect the ELD 3P connector (B).
6. Remove the fuses (A) and (B).
7. Release the three lock tabs (A), then remove the ELD (B).
8. Install the parts in the reverse order of removal.
9. Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tl/iv-2008-2011/remont/body-electrical/#battery) ).

ECM/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 ECM/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 never press the engine start/stop button to select the OFF or ACC mode during the update. If there is a problem with the update, leave the ignition switch ON (II) or vehicle in the ON mode. To prevent ECM/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 ECM/PCM update whenever the ECM/PCM is substituted or replaced. You cannot update a ECM/PCM with a program it already has. It will only accept a new program. High temperature in the engine compartment might cause the ECM/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 vehicle in the ON mode when you disconnect the HIM from the data link connector (DLC). This will prevent ECM/PCM damage.

Scheme 386

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 ECM/PCM and other vehicle systems. If it doesn't, go to the «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ). If you are returning from the DLC circuit troubleshooting, skip steps 4 and 5 , and clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ) after updating the ECM/PCM.
4. Select the INSPECTION MENU with the HDS.
5. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the HDS screen prompts. NOTE: If the TP POSITION CHECK indicates FAILED, continue this procedure.
6. Exit the HDS diagnostic system, then select the update mode, and follow the screen prompts to update the ECM/PCM.
7. If the software in the ECM/PCM is the latest, disconnect the HDS/HIM/GNA600 from the DLC, and go back to the procedure that you were doing. If the software in the ECM/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 ECM/PCM update system requires you to cool the ECM/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 ECM/PCM: Leave the ignition switch in ON (II) or vehicle in the ON mode. Connect a jumper battery (do not connect a battery charger). Shut down the HDS. Disconnect the HDS from the DLC. Reboot the HDS. Reconnect the HDS to the DLC, and try the update procedure again.
8. If the TP POSITION CHECK failed in step 5 , clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
9. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

ECM/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.

Scheme 387

Scheme 388

Scheme 389

Scheme 390

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 ECM/PCM and other vehicle systems. If it doesn't, go to the «DLC CIRCUIT TROUBLESHOOTING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) . If you are returning from the DLC circuit troubleshooting, skip steps 4 through 9 , 18 through 23 , and 26 through 28 , and do this after replacing the ECM/PCM: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/tl/iv-2008-2011/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ). Replace the ATF (A/T) (see «ATF REPLACEMENT»(/acura/tl/iv-2008-2011/remont/automatic-trans/#automatic-transmission) ). Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ).
4. Select the PGM-FI system with the HDS.
5. Select the INSPECTION MENU with the HDS.
6. Select the ETCS TEST, then select the TP POSITION CHECK, and follow the screen prompts. NOTE: If the TP POSITION CHECK indicates FAILED, continue with this procedure.
7. 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 ECM/PCM so you can later download (WRITES) it into the new ECM/PCM. If READ DATA indicates FAILED, continue with this procedure.
8. A/T: Select the A/T system with the HDS.
9. A/T: 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.
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. Canada model: If equipped, remove the ECM/PCM connector guard (A).
13. Disconnect ECM/PCM connectors A, B, and C, then remove the ECM/PCM assembly (D). NOTE: ECM/PCM connectors A, B, and C have symbols (A=[], B=delta, C=o) embossed on them for identification.
14. Remove the cover (A) and the bracket (B) from the ECM/PCM (C).
15. Install the ECM/PCM in the reverse order of removal.
16. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
17. Manually input the VIN to the ECM/PCM with the HDS. NOTE: DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the ECM/PCM; ignore it, and continue this procedure.
18. If the READ DATA (engine oil life) failed in step 7 , go to step 21 (A/T) or step 24 (M/T). Otherwise, go to step 19.
19. Select the PGM-FI system with the HDS.
20. 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.
21. A/T: If the READ DATA (ATF life) failed in step 9 , go to step 24 . Otherwise go to step 22.
22. A/T: Select the A/T SYSTEM with the HDS.
23. A/T: 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.
24. Select IMMOBI system (without keyless access) or ONE PUSH START system (with keyless access) with the HDS.
25. Enter the immobilizer ECM/PCM code that you got from the iN, and use the ECM/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.
26. If the TP POSITION CHECK failed in step 6 clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#intake-air-system__throttle-body-cleaning) ), then go to step 27.
27. If the READ DATA failed in step 7 or the WRITE DATA failed in step 20 , replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/tl/iv-2008-2011/remont/lubrication-system/#engine-lubrication) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/tl/iv-2008-2011/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 28 (A/T) or step 29 (M/T).
28. If the READ DATA failed in step 9 or the WRITE DATA failed in step 23 , replace the ATF (see «ATF REPLACEMENT»(/acura/tl/iv-2008-2011/remont/automatic-trans/#automatic-transmission) ), then go to step 29.
29. Select PGM-FI system, and reset the ECM/PCM with the HDS.
30. Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#pgm-fi-system__ecmpcm-update) ).
31. Do the ECM/PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/tl/iv-2008-2011/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
32. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tl/iv-2008-2011/remont/auxiliary-emission-control-systems/#fuel-and-emissions-systems) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• AIR CLEANER REMOVAL/INSTALLATION
• PCM IDLE LEARN PROCEDURE
• SUBSTITUTING THE ECM/PCM
• THERMOSTAT TEST
• THERMOSTAT REPLACEMENT
• RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• FUEL PRESSURE TEST
• WITHOUT SH-AWD
• VALVE CLEARANCE ADJUSTMENT
• SPARK PLUG INSPECTION
• INTAKE MANIFOLD REMOVAL AND INSTALLATION
• ENGINE COMPRESSION INSPECTION
• VTEC ROCKER ARM TEST
• OIL PAN REMOVAL
• CAMSHAFT REPLACEMENT
• CAMSHAFT REPLACEMENT
• THROTTLE BODY REMOVAL/INSTALLATION
• THROTTLE BODY CLEANING
• ALTERNATOR REMOVAL AND INSTALLATION
• BATTERY TEST
• DRIVER'S DASHBOARD UNDERCOVER REMOVAL/INSTALLATION
• DRIVER'S UNDER-DASH FUSE/RELAY BOX (MICU) REMOVAL/INSTALLATION
• LEFT ENGINE COMPARTMENT WIRE HARNESS (ENGINE COMPARTMENT BRANCH)
• DASHBOARD WIRE HARNESS (VIEW OF MIDDLE TO PASSENGER'S SIDE)
• TRANSMISSION RANGE SWITCH REPLACEMENT
• CLUTCH PEDAL POSITION SWITCH A REPLACEMENT
• CLUTCH PEDAL POSITION SWITCH B REPLACEMENT
• SYMPTOM TROUBLESHOOTING
• SH-AWD CONTROL UNIT UPDATE
• SH-AWD CONTROL UNIT REPLACEMENT
• ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF
• VSA MODULATOR-CONTROL UNIT UPDATE
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• SYMPTOM TROUBLESHOOTING
• GAUGE CONTROL MODULE INPUT TEST
• GAUGE CONTROL MODULE REPLACEMENT
• STEERING ANGLE SENSOR REPLACEMENT
• SRS UNIT REPLACEMENT
• TPMS CONTROL UNIT REPLACEMENT
• POWER CONTROL UNIT
• AUDIO UNIT REMOVAL/INSTALLATION
• SELF-DIAGNOSTIC FUNCTION
• SYMPTOM TROUBLESHOOTING
• SYMPTOM TROUBLESHOOTING
• SYMPTOM TROUBLESHOOTING INFORMATION
• GENERAL TROUBLESHOOTING INFORMATION
• REAR SEAT REMOVAL/INSTALLATION
• FUEL TANK UNIT REMOVAL AND INSTALLATION
• FUEL PRESSURE RELIEVING
• TIMING BELT INSTALLATION
• TRANSMISSION FLUID INSPECTION AND REPLACEMENT
• ENGINE OIL REPLACEMENT
• ENGINE OIL FILTER REPLACEMENT
• MAF SENSOR/IAT SENSOR REPLACEMENT
• ECM/PCM UPDATE
• ECM/PCM REPLACEMENT
• A/F SENSOR REPLACEMENT
• SECONDARY HO2S REPLACEMENT
• 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
• 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
• DTC P0616: STARTER RELAY 2 MALFUNCTION (M/T); DTC P16BD: STARTER CUT RELAY 2 MALFUNCTION (M/T)
• DTC P062F: ECM/PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR
• INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT
• DTC U0029: F-CAN MALFUNCTION (BUS-OFF (ECM/PCM))
• DLC CIRCUIT TROUBLESHOOTING