Pgm-Fi System (4-cyl) — Acura TSX II (2008-2014)

Scheme 356

Scheme 356: Component Location Index

Scheme 357

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.

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 .
Check for a damaged or incorrectly installed intake air duct in the air cleaner. Is it OK? YES -Go to step 3. NO -Reconnect or replace the intake air duct, then go to step 14 .
Check for a dirty air cleaner element. Is it dirty? YES -Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 14 . NO -Go to step 4.
Turn the ignition switch to ON (II).
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 .
Start the engine.
Vary the engine speed between 2, 000 RPM and 3, 000 RPM.
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 .
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.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAF SENSOR
Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES -Go to step 12. 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.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAFSENSOR
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 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. 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 358

Scheme 358: DTC P0102: MAF Sensor Circuit Low Voltage

Scheme 359

Scheme 360

Scheme 361

Turn the ignition switch to ON (II), and wait 2 seconds.
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.
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 3 and body ground. MAF SENSOR/IAT SENSOR 5P CONNECTOR 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 .
Turn the ignition switch to LOCK (0).
Measure the resistance between MAF sensor/IAT sensor 5P connector terminal No. 1 and body ground. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there 190-210 kohms? YES -Go to step 13 . NO -Go to step 9.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B31 and body ground. ECM/PCM CONNECTOR B (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (B31) and the MAF sensor/IAT sensor, then go to step 20 . NO -Go to step 12.
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 1 and ECM/PCM connector terminal B31. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/PCM (B31) and the MAF sensor/IAT sensor, then go to step 20 .
Substitute a known-good MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 2, 000 RPM without load (A/T in P or N, M/T in neutral).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Reinstall the original MAF sensor/IAT sensor, and go to step 26 . NO -Replace the original MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 19.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 362

Scheme 362: DTC P0103: MAF Sensor Circuit High Voltage

Scheme 363

Turn the ignition switch to ON (II), and wait 2 seconds.
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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the MAF sensor/IAT sensor 5P connector.
Disconnect ECM/PCM connector B (49P).
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 2 and ECM/PCM connector terminal B33. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there continuity? YES -Go to step 8. NO -Repair open in the wire between the ECM/PCM (B33) and the MAF sensor/IAT sensor, then go to step 15 .
Reconnect ECM/PCM connector B (49P).
Connect MAF sensor/IAT sensor 5P connector terminals No. 1 and No. 2 with a jumper wire. MAF SENSOR/IAT SENSOR 5P CONNECTOR
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Go to step 20 . NO -Go to step 13.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 364

Scheme 364: DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 365

Scheme 366

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the MAP sensor 3P connector.
Turn the ignition switch to ON (II).
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.
Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. MAP SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 16 . NO -Go to step 8.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C13and MAP sensor 3P connector terminal No. 1. MAP SENSOR 3P CONNECTOR Is there continuity? YES -Go to step 23 . NO -Repair open in the wire between the ECM/PCM (C13) and the MAP sensor, then go to step 18 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. MAP SENSOR 3P CONNECTOR Is there continuity? YES -Repair short in the wire between the ECM/PCM (C11) and the MAP sensor, then go to step 18 . NO -Go to step 23 .
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 367

Scheme 367: DTC P0108: MAP Sensor Circuit High Voltage

Scheme 368

Scheme 369

Scheme 370

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the MAP sensor 3P connector.
Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire. MAP SENSOR 3P CONNECTOR
Turn the ignition switch to ON (II).
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 19 .
Remove the jumper wire from the MAP sensor 3P connector.
Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. MAP SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 14 . NO -Go to step 10.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C14and MAP sensor 3P connector terminal No. 3. MAP SENSOR 3P CONNECTOR Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/PCM (C14) and the MAP sensor, then go to step 20 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C11 and MAP sensor 3P connector terminal No. 2. MAP SENSOR 3P CONNECTOR Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/PCM (C11) and the MAP sensor, then go to step 20 .
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 ).

Check for poor connections or loose terminals at ECT sensors 1, ECT sensor 2, and the MAF sensor/IAT sensor. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connectors or terminals, then go to step 15 .
Remove the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Allow MAF sensor/IAT sensor to cool to the ambient temperature.
Note the ambient temperature.
Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
Turn the ignition switch to ON (II).
Quickly note the value of the IAT SENSOR in the DATA LIST with the HDS.
Compare the value of the IAT SENSOR to the ambient temperature. Does the value of the IAT SENSOR differ 5.4 °F (3 °C) or more from the ambient temperature? YES -Go to step 13 . NO -Go to step 9.
Disconnect the MAF sensor/IAT sensor from its 5P connector.
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.
Connect the MAF sensor/IAT sensor to its 5P connector, but do not install it.
Check the IAT SENSOR in the DATA LIST with the HDS. Does the IAT SENSOR change 63 °F (35 °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.
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTCP0111 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.

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 371

Scheme 371: DTC P0112: IAT Sensor Circuit Low Voltage

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there continuity? YES -Repair short in the wire between the MAF sensor/IAT sensor and the ECM/PCM (B32), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 372

Scheme 372: DTC P0113: IAT Sensor Circuit High Voltage

Scheme 373

Scheme 374

Scheme 375

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the MAF sensor/IAT sensor 5P connector.
Connect MAF sensor/IAT sensor 5P connector terminals No. 4 and No. 5 with a jumper wire. MAF SENSOR/IAT SENSOR 5P CONNECTOR
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the MAF sensor/IAT sensor 5P connector.
Turn the ignition switch to ON (II).
Measure the voltage between MAF sensor/IAT sensor 5P connector terminal No. 5 and body ground. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 4 and ECM/PCM connector terminal B34. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (B34) and the MAF sensor/IAT sensor, then go to step 22 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between MAF sensor/IAT sensor 5P connector terminal No. 5 and ECM/PCM connector terminal B32. MAF SENSOR/IAT SENSOR 5P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (B32) and the MAF sensor/IAT sensor, then go to step 22 .
Turn the ignition switch to LOCK (0).
Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0116: ECT Sensor 1 Range/Performance Problem

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

Turn the ignition switch to ON (II).
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.
Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
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.
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 .
Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
Turn the ignition switch to LOCK (0).
Open the hood, and let the engine cool for 3 hours.
Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC 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 376

Scheme 376: DTC P0117: ECT Sensor 1 Circuit Low Voltage

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 1 2P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. ECT SENSOR 1 2P CONNECTOR Is there continuity? YES -Repair short in the wire between ECT sensor 1 and the ECM/PCM (B24), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 377

Scheme 377: DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 378

Scheme 379

Scheme 380

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 1 2P connector.
Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire. ECT SENSOR 1 2P CONNECTOR
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the ECT sensor 1 2P connector.
Turn the ignition switch to ON (II).
Measure the voltage between ECT sensor 1 2P connector terminal No. 1 and body ground. ECT SENSOR 1 2P CONNECTOR Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECT sensor 1 2P connector terminal No. 2 and ECM/PCM connector terminal B34. ECT SENSOR 1 2P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (B34) and ECT sensor 1, then go to step 22 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECT sensor 1 2P connector terminal No. 1 and ECM/PCM connector terminal B24. ECT SENSOR 1 2P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (B24) and ECT sensor 1, then go to step 22 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 ).

Start the engine, and let it idle for 5 minutes or more.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 0°F (-18 °C) or less indicated? YES -Check for poor connection or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM. If they are OK, replace ECT SENSOR 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 8. NO -Go to step 3.
Turn the ignition switch to LOCK (0).
Allow the engine to cool 104 °F (40 °C) or less.
Start the engine, and let it idle until ECT SENSOR 1 goes up about 158 °F (70 °C)
Check ECT SENSOR 2 in the DATA LIST with the HDS. Does ECT SENSOR 2 also read about 158 °F (70 °C)? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
Check the thermostat (see «THERMOSTAT TEST»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl__thermostat-test) ). Is the thermostat OK? YES -Check for poor connection or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 8. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ), then go to step 8.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Turn the ignition switch to LOCK (0).
Allow the engine to cool 104 °F (40 °C) or less.
Start the engine, and let it idle until ECT SENSOR 1 goes up around 158 °F (70 °C)
Check ECT SENSOR 2 in the DATA LIST with the HDS. 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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Make sure the blower switch is off.
Check the FAN HIGH CTRL and FAN LOW CTRL in the DATA LIST with the HDS. Is it OFF? YES -Go to step 5. NO -Wait until the FAN HIGH CTRL and FAN LOW CTRL are off, then go to step 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/tsx/ii-2008-2014/remont/cooling-fan/#fan-controls-4-cyl) ), and the radiator fan relay (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). If the circuits and the relay are OK, go to step 19 . NO -Go to step 6.
Let the engine cool until the coolant temperature is 104 °F (40°C) or less.
Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Start the engine, and let it idle.
Let the engine idle until ECT SENSOR 1 goes up 41 °F (23 °C) or more from the recorded temperature.
Check ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the recorded value of ECT SENSOR 2 to the present value of ECT SENSOR 2. Did the temperature rise 14 °F (8 °C) or more? YES -Test the thermostat (see «THERMOSTAT TEST»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl__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.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Let the engine cool until the coolant temperature is between 21 °F (-6°C) and 104 °F (40 °C).
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0128 indicated? YES -Check the cooling system (see «COMPONENT LOCATION INDEX»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl__component-location-index) ). If the cooling system is OK, go to step 19 . NO -Go to step 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. NO -If the screen indicates FAILED, check the cooling system (see «COMPONENT LOCATION INDEX»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl__component-location-index) ). If the cooling system is OK, go to step 19. If the screen indicates NOT COMPLETED, go to step 14 .
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM, (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Let the engine cool until the coolant temperature is between 21 °F (-6 °C) and 104 °F (40 °C).
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.
Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 20 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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: A/F Sensor (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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C) A/T in D, M/T in 3rd or 4th Engine speed between 1, 500-3, 000 RPM Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed about 32 mph (52 km/h) or more
Monitor the OBD STATUS for DTC P0133 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C) A/T in D, M/T in 3rd or 4th Engine speed between 1, 500-3, 000 RPM Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed about 32 mph (52 km/h) or more
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0133 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.
Monitor the OBD STATUS for DTC P0133 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. 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: A/F Sensor (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 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 P0135 is stored at the same time as DTC P0134, troubleshoot DTC P0135 first, then recheck for DTC P0134.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0134 indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 1 . NO -Go to step 11.
Monitor the OBD STATUS for DTC P0134 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 10 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the 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.

DTC P0135: A/F Sensor (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 ).

Scheme 381

Scheme 381: DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

Scheme 382

Scheme 383

Scheme 384

Scheme 385

Scheme 386

Scheme 387

Scheme 388

Scheme 389

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 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.
Turn the ignition switch to LOCK (0).
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 .
Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
Test the PGM-FI subrelay (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). Is the relay OK? YES -Go to step 9. NO -Replace the PGM-FI subrelay, then go to step 24 .
Disconnect the A/F sensor (Sensor 1) 4P connector.
At the sensor side, measure the resistance between A/F sensor (Sensor 1)4P connector terminals No. 3 and No. 4. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there 2.0-2.7 ohms at room temperature? YES -Go to step 11. NO -Go to step 23 .
At the sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 2 and No. 3, and between terminals No. 2 and No. 4 individually. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Go to step 23 . NO -Go to step 12.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C9 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step 24 . NO -Go to step 15.
Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and ECM/PCM connector terminal C9. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Go to step 16. NO -Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step 24 .
Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and PGM-FI subrelay 4P connector terminal No. 2. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Go to step 17. NO -Repair open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step 24 .
Disconnect ECM/PCM connector A (49P).
Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and ECM/PCM connector terminal A22. PGM-FI SUBRELAY 4P CONNECTOR Is there continuity? YES -Go to step 30 . NO -Repair open in the wire between the ECM/PCM (A22) and the PGM-FI subrelay, then go to step 24 .
Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
Disconnect the A/F sensor (Sensor 1) 4P connector.
Disconnect the EVAP canister vent shut valve 2P connector.
Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and body ground. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Repair short in the wire between the PGM-FI subrelay, the A/F sensor (Sensor 1), and the EVAP canister vent shut valve. Also replace the No. 14 Fl SUB (15 A) fuse, then go to step 24 . NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-4-cyl__removal-and-installation) ), then go to step 24 .
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 2 . NO -Go to step 29.
Monitor the OBD STATUS for DTC P0135 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step 2 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0135 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 32 . If the ECM/PCM was substituted, go to step 2 . NO -Go to step 34.
Monitor the OBD STATUS for DTC P0135 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 33 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 32 . If the ECM/PCM was substituted, go to step 2 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0137: Secondary H02S (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 390

Scheme 390: DTC P0137: Secondary H02S (Sensor 2) Circuit Low Voltage

Scheme 391

Scheme 392

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Monitor the OBD STATUS for DTC P0137 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 secondary H02S (Sensor 2) and the ECM/PCM. If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.
Turn the ignition switch to LOCK (0).
Disconnect the secondary H02S (Sensor 2) 4P connector.
Connect secondary H02S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire. SECONDARY H02S (SENSOR 2) 4P CONNECTOR
Turn the ignition switch to ON (II).
Check the H02S S2 OUTPUT VOLTAGE in the DATA LIST with the HDS. Does the voltage stay at 0.12 V or less? YES -Go to step 10. NO -Go to step 22 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the secondary H02S (Sensor 2) 4P connector.
Turn the ignition switch to ON (II).
Check H02S S2 OUTPUT VOLTAGE in the DATA LIST with the HDS. Is there about 5.0 V? YES -Go to step 14. NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B37 and body ground. ECM/PCM CONNECTOR B (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (B37) and secondary H02S (Sensor 2), then go to step 24 . NO -Go to step 31 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B36 and body ground. ECM/PCM CONNECTOR B (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (B36) and secondary H02S (Sensor 2), then go to step 24 . NO -Go to step 31 .
Turn the ignition switch to LOCK (0).
Replace secondary H02S (Sensor 2) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . NO -Go to step 30.
Monitor the OBD STATUS for DTC P0137 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 33 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 35.
Monitor the OBD STATUS for DTC P0137 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 34 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 33 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.

DTC P0138: Secondary H02S (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 393

Scheme 393: DTC P0138: Secondary H02S (Sensor 2) Circuit High Voltage

Scheme 394

Scheme 395

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Check H02S 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 H02S (Sensor 2) and the ECM/PCM.
Turn the ignition switch to LOCK (0).
Disconnect the secondary H02S (Sensor 2) 4P connector.
Connect secondary H02S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire. SECONDARY H02S (SENSOR 2) 4P CONNECTOR
Turn the ignition switch to ON (II).
Check H02S 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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the secondary H02S (Sensor 2) 4P connector.
Connect secondary H02S (Sensor 2) 4P connector terminal No. 2 to body ground with a jumper wire. SECONDARY H02S (SENSOR 2) 4P CONNECTOR
Turn the ignition switch to ON (II).
Check H02S 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 (B37) and secondary H02S (Sensor 2), then go to step 21 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B36 and body ground. ECM/PCM CONNECTOR B (49P) Is there continuity? YES -Go to step 29 . NO -Repair open in the wire between the ECM/PCM (B36) and secondary H02S (Sensor 2), then go to step 21 .
Turn the ignition switch to LOCK (0).
Replace secondary H02S (Sensor 2) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine, and let it idle without load (A/Tin P or N, M/T in neutral) until the radiator fan comes on.
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
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . NO -Go to step 28.
Monitor the OBD STATUS for DTC P0138 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (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 .
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle without load (A/T in P or N, M/Tin neutral) until the radiator fan comes on.
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 about 1 minute or more
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 31 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 34.
Monitor the OBD STATUS for DTC P0138 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 33 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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: Secondary H02S (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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
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 throttle fully closed) for 10 seconds
Monitor the OBD STATUS for DTC P0139 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 H02S (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.
Turn the ignition switch to LOCK (0).
Replace secondary H02S (Sensor 2) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
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 throttle fully closed) for 10 seconds
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0139 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . NO -Go to step 14.
Monitor the OBD STATUS for DTC P0139 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (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: Secondary H02S (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 ).

Scheme 396

Scheme 396: DTC P0141: Secondary H02S (Sensor 2) Heater Circuit Malfunction

Scheme 397

Scheme 398

Scheme 399

Scheme 400

Scheme 401

Scheme 402

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM.
Turn the ignition switch to LOCK (0).
Check the No. 7 ACG (15 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES -Go to step 7. NO -Repair short in the wire between secondary H02S (Sensor 2) and the No. 7 ACG (15 A) fuse. Also replace the No. 7 ACG (15 A) fuse, then go to step 23 .
Disconnect the secondary H02S (Sensor 2) 4P connector.
At secondary H02S (Sensor 2) side, measure the resistance between secondary H02S (Sensor 2) 4P connector terminals No. 3 and No. 4. SECONDARY H02S (SENSOR 2) 4P CONNECTOR Is there 5.4-7.3 ohms at room temperature? YES -Go to step 9. NO -Go to step 22 .
At secondary H02S (Sensor 2) side, check for continuity between body ground and secondary H02S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. SECONDARY H02S (SENSOR 2) 4P CONNECTOR Is there continuity? YES -Go to step 22 . NO -Go to step 10.
Turn the ignition switch to ON (II).
Measure the voltage between secondary H02S (Sensor 2) 4P connector terminals No. 3 and No. 4. SECONDARY H02S (SENSOR) 4P CONNECTOR Is there battery voltage? YES -Go to step 12. NO -Go to step 16 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between ECM/PCM connector terminal B4 and body ground. ECM PCM CONNECTOR B (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (B4) and secondary H02S (Sensor 2), then go to step 23 . NO -Go to step 29 .
Measure the voltage between secondary H02S (Sensor 2) 4P connector terminal No. 4 and body ground. SECONDARY H02S (SENSOR 2) 4P CONNECTOR Is there battery voltage? YES -Go to step 17. NO -Repair open in the wire between secondary H02S (Sensor 2) and the No. 7 ACG (15 A) fuse, then go to step 23 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Connect secondary H02S (Sensor 2) 4P connector terminal No. 3 to body ground with a jumper wire. SECONDARY H02S (SENSOR 2) 4P CONNECTOR
Check for continuity between ECM/PCM connector terminal B4 and body ground. ECM/PCM CONNECTOR B (49P) Is there continuity? YES -Go to step 29 . NO -Repair open in the wire between the ECM/PCM (B4) and secondary H02S (Sensor 2), then go to step 23 .
Replace secondary H02S (Sensor 2) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . NO -Go to step 28.
Monitor the OBD STATUS for DTC P0141 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 indicated? YES -Check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 31 . If th6 ECM/PCM was substituted, go to step 1 . NO -Go to step 33.
Monitor the OBD STATUS for DTC P0141 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 32 , go to the indicated DTC's troubleshooting.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 31 . 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: Fuel System Too Lean; DTC P0172: 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. If any of the DTCs listed below are stored at the same time as DTC P0171 and/or P0172, troubleshoot those DTCs first, then recheck for P0171 and/or P0172. P0101, P0102, P0103: MAF sensor P0107, P0108, P1128, P1129: MAP sensor P0133, P1172, P1157, P2195, P2238, P2252, P2A00: A/F sensor (Sensor 1) P0134, P0135: A/F sensor (Sensor 1) heater P0137, P0138, P0139: Secondary H02S (Sensor 2) P0141: Secondary H02S (Sensor 2) heater P0443, P0496: EVAP canister purge valve P2646, P2647, P2648, P2649: VTEC system

Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl__fuel-pressure-test) ). Is the fuel pressure OK? YES DTC P0171 indicated: Go to step 2. DTC P0172 indicated: Go to step 3. NO -Check these items: If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl) ), then go to step 6 . If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl) ), then go to step 6 .
Check for vacuum leaks at these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Intake manifold Brake booster Brake booster hose Intake air duct Are the parts OK? YES -Go to step 3. NO -Repair or replace parts with leaks, then go to step 6 .
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.
Check under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C) A/T in N, M/T in neutral All electrical loads off
Monitor the ENGINE SPEED in the DATA LIST with the HDS. Raise and hold the engine speed at 2, 500 RPM. While holding the RPM steady, check the MAF SENSOR in the DATA LIST. Is there about 7.0-8.6 gm/s? YES -Replace the injectors (see «INJECTOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 6. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 6.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
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 and/or P0172 may take up to 40 minutes of test driving to set. Using the HDS, monitor the short term fuel trim (ST FUEL TRIM). If the ST FUEL TRIM stays within 0.8-1.3, there is no problem at this time.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0171 orP0172 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.

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

Special Tools Required

Pressure Gauge Adapter 07NAJ-P07010A
A/T Low Pressure Gauge w/Panel 07406-0070301
AT Pressure Test Hose 07AAJ-PY4A100
A/T Pressure Adapter 07MAJ-PY40120
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 P0304) 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 P0304) will be stored. When the misfire stops, the MIL will remain on. If any of the DTCs listed below are indicated at the same time as the random misfire DTCs, troubleshoot those DTCs first, then recheck for random misfire DTCs: P0101, P0102, P0103: MAF sensor P0107, P0108: MAP sensor P0171, P0172: Fuel system P0335, P0339: CKP sensor P0365, P0369: CMP sensor B P0506, P0507: Idle control system P2646, P2647, P2648, P2649: VTEC system

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (A/Tin P or N, M/Tin neutral).
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 9 . NO -Go to step 6.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APP SENSOR
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
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 11.
Inspect the spark plugs (see «IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/ignition-system/#ignition-system-4-cyl) ). If the spark plugs are fouled or worn, replace them.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTP SENSOR CLV (calculated load value) APPSENSOR
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 14. NO -Go to step 20 .
Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl__fuel-pressure-test) ). Is the fuel pressure OK? YES -Go to step 15. NO - If the fuel pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl) ), then go to step 20 . If the fuel pressure is too low, check the fuel pump, the fuel feed lines, and the fuel filter. If they are OK, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl) ), then go to step 20 .
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.
Check under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176 °F (80 °C) A/T in P or N, M/T in neutral All electrical loads off
Monitor the ENGINE SPEED in the DATA LIST with the HDS. Raise and hold the engine speed steady at 2, 500 ± 100 RPM. While holding the RPM steady, check the MAF SENSOR in the DATA LIST. Is there about 7.0-8.6 gm/s? YES -Go to step 18. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 20 .
Turn the ignition switch to LOCK (0).
Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl__vtec-rocker-arm-test) ). Does the engine pass the VTEC rocker arm test? YES -Go to step 20. NO -Repair or replace the VTEC rocker arm, then go to step 20.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APPSENSOR
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0300, P0301, P0302, P0303, or P0304 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to the troubleshooting for DTC P0301, P0302, P0303, or P0304 (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»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dtc-p0301-no-1-cylinder-misfire) ). NO -Go to step 26.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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. • NO -If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 24 .

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

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

Scheme 403

Scheme 403: DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: N

Scheme 404

Scheme 405

Scheme 406

Scheme 407

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle without load (A/Tin P or N, M/T in neutral).
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10minuteswiththeHDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 9 . NO -Go to step 6.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APPSENSOR
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals in the fuel system and the ignition system.
Turn the ignition switch to LOCK (0).
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APP SENSOR
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 13. NO -Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Make sure that the ignition coil connectors are secure.
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the ignition coil was exchanged? YES -Replace the faulty ignition coil (see «IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/ignition-system/#ignition-system-4-cyl) ), then go to step 40 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Exchange the spark plug from the problem cylinder with one from another cylinder.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APP SENSOR
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 18. NO -Intermittent misfire due to spark plug fouling (no misfire at this time).
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the spark plug was exchanged? YES -Replace the faulty spark plug, then go to step 40 . NO -Go to step 19.
Turn the ignition switch to LOCK (0).
Exchange the injector from the problem cylinder with one from the another cylinder.
Start the engine, and let it idle for 2 minutes.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APP SENSOR
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE in the DATA LIST for 10 minutes with the HDS. Does the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, and/or CYL4 MISFIRE show misfire counts? YES -Go to step 24. NO -Intermittent misfire due to bad contact at the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
Determine which cylinder had the misfire. Does the misfire occur in the cylinder where the injector was exchanged? YES -Replace the faulty injector (see «INJECTOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 40 . NO -Go to step 25.
Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl__engine-compression-inspection) ). Did the engine pass both tests? YES -Go to step 26. NO -Repair the engine, then go to step 40 .
Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl__vtec-rocker-arm-test) ). Did the engine pass the test? YES -Go to step 27. NO -Repair the VTEC rocker arm (see «ROCKER ARM AND SHAFT DISASSEMBLY/REASSEMBLY»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl__rocker-arm-and-shaft-disassemblyreassembly) ), then go to step 40 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Turn the ignition switch to ON (II).
Measure the voltage between body ground and the appropriate ECM/PCM connector terminal of the problem cylinder (see table). TERMINAL VOLTAGE REFERENCE CHART PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 C5 BRN No. 2 P0302 C6 RED No. 3 P0303 C7 BLU No. 4 P0304 C8 YEL ECM/PCM CONNECTOR C (49P) Is there battery voltage? YES -Go to step 36 . NO -Go to step 32.
Turn the ignition switch to LOCK (0).
Disconnect the injector 2P connector from the problem cylinder.
Turn the ignition switch to ON (II).
Measure the voltage between injector 2P connector terminal No. 1 and body ground. INJECTOR 2P CONNECTOR Is there battery voltage? YES -Go to step 36. NO -Repair open in the wire between the injector and PGM-FI main relay 1, then go to step 40 .
Turn the ignition switch to LOCK (0).
Check for continuity between body ground and the ECM/PCM connector terminal of the problem cylinder (see table). TERMINAL CONTINUITY REFERENCE CHART PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 C5 BRN No. 2 P0302 C6 RED No. 3 P0303 C7 BLU No. 4 P0304 C8 YEL ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM and the injector, then go to step 40 . NO -Go to step 38.
Check for continuity between appropriate injector 2P connector terminal No. 2 and the ECM/PCM connector terminal of the problem cylinder (see table). TERMINAL CONTINUITY REFERENCE CHART PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0301 C5 BRN No. 2 P0302 C6 RED No. 3 P0303 C7 BLU No. 4 P0304 C8 YEL INJECTOR 2P CONNECTOR Is there continuity? YES -Go to step 39. NO -Repair open in the wire between the ECM/PCM and the injector, then go to step 40 .
At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2. INJECTOR 2P CONNECTOR Is there 10-13 ohms at room temperature? YES -Go to step 49 . NO -Replace the injector (see «INJECTOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 40.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTP SENSOR CLV (calculated load value) APPSENSOR
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0301, P0302, P0303, or P0304 indicated? YES -Check for poor connections or loose terminals at the ignition coils, the injectors, and the ECM/PCM, then go to the troubleshooting for DTC P0300, P0301, P0302, P0303, or P0304 (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»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dtc-p0300-random-misfire-and-any) ). NO -Go to step 48.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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 47 , go to the indicated DTC's troubleshooting. 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 46 .
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED RELTPSENSOR CLV (calculated load value) APP SENSOR
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0301, P0302, P0303, or P0304 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 51 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 53.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 52 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 51 . 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 51 .

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 408

Scheme 408: DTC P0325: Knock Sensor Circuit Malfunction

Scheme 409

Scheme 410

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the knock sensor 1P connector (see «OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C46 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C46) and the knock sensor, then go to step 14 . NO -Go to step 11 .
Connect the knock sensor 1P connector terminal to body ground with a jumper wire. KNOCK SENSOR 1P CONNECTOR
Check for continuity between ECM/PCM connector terminal C46 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the ECM/PCM (C46) and the knock sensor, then go to step 14 .
Replace the knock sensor (see «OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Go to step 21 . NO -Go to step 20.
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 instep 19 , go to the indicated DTC's troubleshooting. 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 18 .
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 22 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 24.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 22 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, go to step 22 .

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 411

Scheme 411: DTC P0335: CKP Sensor No Signal

Scheme 412

Scheme 413

Scheme 414

Scheme 415

Scheme 416

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
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.
Turn the ignition switch to LOCK (0).
Disconnect the CKP sensor 3P connector.
Turn the ignition switch to ON (II).
Measure the voltage between CKP sensor 3P connector terminal No. 3 and body ground. CKP SENSOR 3P CONNECTOR 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 .
Measure the voltage between CKP sensor 3P connector terminal No. 1 and body ground. CKP SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
Measure the voltage between CKP sensor 3P connector terminals No. 2 and No. 3. CKP SENSOR 3P CONNECTOR Is there battery voltage? YES -Go to step 17 . NO -Repair open in the wire between the CKP sensor and G101; A/T (see «ENGINE WIRE HARNESS (A/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-at) ), M/T (see «ENGINE WIRE HARNESS (M/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-mt) ), then go to step 19 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C32 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C32) and the CKP sensor, then go to step 19 . NO -Go to step 15.
Connect CKP sensor 3P connector terminal No. 1 to body ground with a jumper wire. CKP SENSOR 3P CONNECTOR
Check for continuity between ECM/PCM connector terminal C32 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Go to step 25 . NO -Repair open in the wire between the ECM/PCM (C32) and the CKP sensor, then go to step 19 .
Turn the ignition switch to LOCK (0).
Replace the CKP sensor (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds.
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.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
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.
Check for poor connections or loose 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 the terminals, then go to step 11 .
Remove the oil pan (see «OIL PAN REMOVAL»(/acura/tsx/ii-2008-2014/remont/mechanical/#engine-block-4-cyl) ), and check the teeth of the CKP pulser plate (on the flywheel side of the crankshaft) for damage or metal debris. Is the pulse plate OK? YES -Go to step 9. NO -Clean or replace the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#engine-block-4-cyl) ), then go to step 11 .
Turn the ignition switch to LOCK (0).
Replace the CKP sensor (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Start the engine, and let it idle for 10 seconds.
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.

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

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

Scheme 417

Scheme 417: DTC P0351: No. 1 Cylinder Ignition Coil Circuit Malfunction; DTC P0352: No. 2 Cylinder Ignition Coil

Scheme 418

Scheme 419

Scheme 420

Scheme 421

Scheme 422

Scheme 423

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, and/or P0354 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 and the ECM/PCM.
Turn the ignition switch to LOCK (0).
Exchange the ignition coil from the problem cylinder with one from another cylinder.
Start the engine.
Check for Pending or Confirmed DTCs with the HDS. Is an ignition coil DTC indicated at the exchanged cylinder? YES -Replace the faulty ignition coil (see «IGNITION COIL AND SPARK PLUG REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/ignition-system/#ignition-system-4-cyl) ), then go to step 25 . NO -Go to step 9.
Turn the ignition switch to LOCK (0).
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 12 .
Test the ignition coil relay (A) in the under-hood fuse/relay box (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). Is the ignition coil relay OK? YES -Go to step 15 . NO -Replace the ignition coil relay, then go to step 25 .
Remove the ignition coil relay (A) from the under-hood fuse/relay box.
Disconnect all ignition coil 3P connectors.
Check for continuity between No. 1 ignition coil 3P connector terminal No. 3 and body ground. No. 1 IGNITION COIL 3P CONNECTOR 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 25 . NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-4-cyl__removal-and-installation) ), then go to step 25 .
Reinstall the ignition coil relay.
Disconnect the ignition coil 3P connector from the problem cylinder.
Turn the ignition switch to ON (II).
Measure the voltage between ignition coil 3P connector terminal No. 3 of the problem cylinder and body ground (see table). TERMINAL VOLTAGE REFERENCE CHART PROBLEM CYLINDER DTC No. 1 P0351 No. 2 P0352 No. 3 P0353 No. 4 P0354 IGNITION COIL 3P CONNECTOR Is there battery voltage? YES -Go to step 19. NO -Repair open in the wire between the ignition coil and the ignition coil relay, then go to step 25 .
Turn the ignition switch to LOCK (0).
Check for continuity between ignition coil 3P connector terminal No. 2 of the problem cylinder and body ground (see table). TERMINAL CONTINUITY REFERENCE CHART PROBLEM CYLINDER DTC No. 1 P0351 No. 2 P0352 No. 3 P0353 No. 4 P0354 IGNITION COIL 3P CONNECTOR Is there continuity? YES -Go to step 21. NO -Repair open in the wire between the ignition coil and G102, then go to step 25 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between body ground and the ECM/PCM connector terminal of the problem cylinder (see table). TERMINAL CONTINUITY REFERENCE CHART PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0351 C15 YEL/GRN No. 2 P0352 C16 BLU/RED No. 3 P0353 C17 WHT/BLU No. 4 P0354 C18 BRN ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM and the ignition coil, then go to step 25 . NO -Go to step 24.
Check for continuity between appropriate ignition coil 3P connector terminal No. 1 and the ECM/PCM connector terminal of the problem cylinder (see table). TERMINAL CONTINUITY REFERENCE CHART PROBLEM CYLINDER DTC ECM/PCM TERMINAL WIRE COLOR No. 1 P0351 C15 YEL/GRN No. 2 P0352 C16 BLU/RED No. 3 P0353 C17 WHT/BLU No. 4 P0354 C18 BRN IGNITION COIL 3P CONNECTOR Is there continuity? YES -Go to step 31 . NO -Repair open in the wire between the ECM/PCM and the ignition coil, then go to step 25.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, and/or P0354 indicated? YES -Check for poor connections or loose terminals at the ignition coil and the ECM/PCM, then go to step 2 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0351, P0352, P0353, and/or P0354 indicated? YES -Check for poor connections or loose terminals at the ignition coil and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 2 . 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting

DTC P0365: CMP Sensor B 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 424

Scheme 424: DTC P0365: CMP Sensor B Circuit No Signal

Scheme 425

Scheme 426

Scheme 427

Scheme 428

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
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 CMP sensor B and the ECM/PCM.
Turn the ignition switch to LOCK (0).
Disconnect the CMP sensor B 3P connector.
Turn the ignition switch to ON (II).
Measure the voltage between CMP sensor B 3P connector terminal No. 3 and body ground. CMP SENSOR B 3P CONNECTOR Is there battery voltage? YES -Go to step 9. NO -Repair open in the wire between CMP sensor B and PGM-FI main relay 1, then go to step 18 .
Measure the voltage between CMP sensor B 3P connector terminal No. 1 and body ground. CMP SENSOR B3P CONNECTOR Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
Measure the voltage between CMP sensor 3P connector terminals No. 2 and No. 3. CMP SENSOR B 3P CONNECTOR Is there battery voltage? YES -Go to step 16 . NO -Repair open in the wire between CMP sensor B and G101; A/T (see «ENGINE WIRE HARNESS (A/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-at) ), M/T (see «ENGINE WIRE HARNESS (M/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-mt) ), then go to step 18 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C31 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C31) and CMP sensor B, then go to step 18 . NO -Go to step 15.
Check for continuity between CMP sensor B3P connector terminal No. 1 and ECM/PCM connector terminal C31. CMP SENSOR B 3P CONNECTOR Is there continuity? YES -Go to step 23 . NO -Repair open in the wire between the ECM/PCM (C31) and CMP sensor B, then go to step 18 .
Turn the ignition switch to LOCK (0).
Replace CMP sensor B (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the ECM/PCM, then go to step 5 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 5 . 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0369: CMP Sensor B 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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds.
Check the CMP B NOISE in the DATA LIST with the HDS. Are 0 counts indicated? YES -Go to step 8 . NO -Go to step 5.
Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
Check the CMP B NOISE in the DATA LIST with the HDS. Are 0 counts indicated? YES -Go to step 8 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor B and the ECM/PCM.
Check for poor connections or loose terminals at these locations: CMP sensor B 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 .
Check for damage on CMP pulse plate B (see «CMP PULSE PLATE B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl) ). Is the pulse plate damaged? YES -Replace CMP pulse plate B (see «CMP PULSE PLATE B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#cylinder-head-4-cyl) ), then go to step 11 . NO -Go to step 9.
Turn the ignition switch to LOCK (0).
Replace CMP sensor B (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine, and let it idle for 10 seconds.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0369 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the ECM/PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC 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 ).

Turn the ignition switch to ON (II).
Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050A indicated? YES -Go to the indicated DTCs troubleshooting. NO -Go to step 3.
Check for poor connections or 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 .
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/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 19 .
Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 19 . NO -Go to step 6.
Let the engine cool until the value of ECT SENSOR 1 is 122 °F (50°C) or less.
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds or more.
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 .
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/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl__throttle-body-removalinstallation) ), then go to step 19 .
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.
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 7.0-8.6 gm/s? YES -Go to step 13. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 19 .
Turn the ignition switch to LOCK (0).
Allow the engine to cool to the ambient temperature.
Note the ambient temperature.
Turn the ignition switch to ON (II).
Quickly note the value of IAT SENSOR in the DATA LIST with the HDS.
Compare the value of the IAT SENSOR to the ambient temperature. Does the value of the I A T SENSOR differ 5.4 °F (3 °C) or more from the ambient temperature? YES -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), 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 «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 19. If there is damage in the throttle bore, replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl__throttle-body-removalinstallation) ), then go to step 19.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Start the engine, and let it idle for 10 seconds or more.
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.
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. NO -If the screen indicates FAILED, 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 . 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 ).

Turn the ignition switch to ON (II).
Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050B indicated? YES -Go to the indicated DTCs troubleshooting. NO -Go to step 3.
Check for poor connections or blockage at the intake air duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the intake air duct, then go to step 21 .
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/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 21 .
Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ), then go to step 21 . NO -Go to step 6.
Let the engine cool until the value of ECT SENSOR 1 is 122 °F (50 °C) or less.
Clear the DTC with the HDS.
Start the engine, and let it idle for 10 seconds or more.
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 .
Inspect the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/tsx/ii-2008-2014/remont/ignition-system/#ignition-system-4-cyl) ). Is the ignition timing OK? YES -Go to step 12 . NO -Go to step 11.
Check for damage at the CKP sensor (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ) and the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#engine-block-4-cyl) ). Is the CKP sensor and/or the CKP pulse plate damaged? YES -Replace the CKP sensor (see «CMP SENSOR B REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ) and/or the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/mechanical/#engine-block-4-cyl) ), then go to step 6 . NO -Go to step 28 .
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/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl__throttle-body-removalinstallation) ), then go to step 21 .
Start the engine. Hold the engine speed at 3, 000 RPM without load (AT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 7.0-8.6 gm/s? YES -Go to step 15. NO -Replace the MAF sensor/IAT sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 21 .
Turn the ignition switch to LOCK (0).
Allow ECT sensor 1 and ECT sensor 2 to cool to the ambient temperature.
Note the ambient temperature.
Turn the ignition switch to ON (II).
Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 to the ambient temperature, and the value of ECT SENSOR 2 to 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 21. NO -Check and repair any problems with the following items. Repair or replace them if needed, then go to step 21. If all of the items are OK, go to step 28 . Engine compression and cylinder leakdown VTEC system Engine oil A/C system
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Start the engine, and let it idle for 10 seconds or more.
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.
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. 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 .
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
Start the engine, and let it idle for 10 seconds or more.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 30 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 32 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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 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.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0562 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl) ), 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/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T. in neutral) for 1 minute.
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 5 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 429

Scheme 429: DTC P0563: ECM/PCM Power Source Circuit Unexpected Voltage

Scheme 430

Scheme 431

Scheme 432

Scheme 433

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Wait 10 seconds.
Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (44P).
Measure the voltage between ECM/PCM connector terminal A7 and body ground. ECM/PCM CONNECTOR A (49P) Is there battery voltage? YES -Go to step 13 . NO -Go to step 11.
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
Check for continuity between ECM/PCM connector terminal A7 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (A7) and PGM-FI main relay 1, then go to step 16 . NO -Go to step 15 .
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
Measure the voltage between ECM/PCM connector terminal A9 and body ground. ECM/PCM CONNECTOR A (49P) Is there battery voltage? YES -Repair short to power in the wire between the ECM/PCM (A9) and PGM-FI main relay 1, then go to step 16 . NO -Go to step 15.
Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). Is the relay OK? YES -Go to step 23 . NO -Replace PGM-FI main relay 1, then go to step 16.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Turn the ignition switch to LOCK (0).
Wait 10 seconds.
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 2 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then recheck. If the ECM/PCM was substituted, go to step 2 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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) while updating the ECM/PCM. If you do, the ECM/PCM can be damaged.

Update the ECM/PCM (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0602 indicated? YES -Replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -The troubleshooting is complete.

DTC P0606: ECM/PCM Processor Malfunction

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Wait 40 seconds.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0606 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
Wait 40 seconds.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P0606 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 8 . 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P060A: PCM (A/T system) 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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Update the PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P060A indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 )

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P062F indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P062F indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P0630: VIN Not Programmed or Mismatch

Turn the ignition switch to ON (II).
Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES -Go to step 5 . NO -Go to step 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.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dtc-p062f-ecmpcm-internal-control-module) ). NO -Go to step 9 .
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and wait 5 seconds.
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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 poor connections or loose terminals at the IGP line connectors before replacing the ECM/PCM.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Start the engine, then let it idle for 30 seconds.
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 10 . If the ECM/PCM was substituted, go to step 9 . 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 434

Scheme 434: DTC P0720: Output Shaft (Countershaft) Speed Sensor Circuit Malfunction

Scheme 435

Scheme 436

Scheme 437

Scheme 438

Scheme 439

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.
Test-drive for several minutes.
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.
Turn the ignition switch to LOCK (0).
Disconnect the output shaft (countershaft) speed sensor 3P connector.
Turn the ignition switch to ON (II).
Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 1 and body ground. OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 8. NO -Repair open in the wire between the ECM (C13) and the output shaft (countershaft) speed sensor, then go to step 18 .
Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 2 and body ground. OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 9. NO -Go to step 10 .
Measure the voltage between output shaft (countershaft) speed sensor 3P connector terminals No. 1 and No. 3. OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR 3P CONNECTOR Is there about 5 V? YES -Go to step 16 . NO -Repair open in the wire between the ECM (C14) and the output shaft (countershaft) speed sensor, then go to step 18 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM connector B (49P).
Check for continuity between ECM connector terminal B38 and body ground. ECM CONNECTOR B (49P) 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.
Connect output shaft (countershaft) speed sensor 3P connector terminal No. 2 to body ground with a jumper wire. OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR 3P CONNECTOR
Check for continuity between ECM connector terminal B38 and body ground. ECM CONNECTOR B (49P) 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 .
Turn the ignition switch to LOCK (0).
Replace the output shaft (countershaft) speed sensor (see «OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM with the HDS.
Do the ECM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Test-drive under these conditions: Engine coolant temperature (ECTSENSOR 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 5 seconds
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.
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. 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 .
Reconnect all connectors.
Update the ECM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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 5 seconds
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 27 . If the ECM was substituted, go to step 1 . NO -Go to step 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 28 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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 P1109: BARO Sensor Circuit Out of Range High

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

Reset the ECM/PCM with the HDS.
Start the engine.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1116: ECT Sensor 1 Circuit Range/Performance Problem

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 connectors or terminals, then go to step 20 .
Turn the ignition switch to ON (II).
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.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 99 °F (37 °C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 20 . NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Allow ECT sensor 1 to cool to the ambient temperature.
Note the ambient temperature.
Turn the ignition switch to ON (II).
Quickly note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
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 the ambient temperature? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 20 . 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.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 99 °F (37 °C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 20 . NO -Go to step 14.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 20 . NO -Go to step 15.
Turn the ignition switch to LOCK (0).
Allow the ECT sensors to cool to the ambient temperature.
Note the ambient temperature.
Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 to the ambient temperature, and the value of ECT SENSOR 2 to the ambient temperature individually. Does either sensor differ more than 5.4 °F (3 °C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4 °F (3 °C) from the ambient temperature. Refill the engine coolant (see «COOLANT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ), then go to step 20 . NO -Intermittent failure, the system is OK at this time. Reinstall ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ) and ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ). Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTCP1116 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.

DTC P1128: MAP Sensor Signal Lower Than Expected

Turn the ignition switch to ON (II).
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.
Clear the DTC with the HDS.
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed at 1, 400 RPM or more A/T in D, M/T in 3rd Vehicle speed accelerated from 16 mph (25 km/h) or more under half throttle
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.
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) Engine speed at 1, 400 RPM or more A/T in D, M/T in 3rd Vehicle speed accelerated from 16 mph (25 km/h) or more under half throttle
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.
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 instep 14 , go to the indicated DTC's troubleshooting. 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 ).

Check for vacuum leaks in 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.
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.
Check the MAP SENSOR in the DATA LIST with the HDS. Is more than 36.9 kPa (11.0 inHg, 277 mmHg), or 1.1 V held for more than for 5 seconds? YES -Go to step 7 . NO -Go to step 4.
Clear the DTC with the HDS.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) A/Tin D, M/Tin5th Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds During the drive, decelerate (with throttle fully closed) for at least 2 seconds
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.
Turn the ignition switch to LOCK (0).
Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) A/T in D, M/T in 5th Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds During the drive, decelerate (with throttle fully closed) for at least 2 seconds
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.
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. 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 P1157: A/F Sensor (Sensor 1) AFS 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 440

Scheme 440: DTC P1157: A/F Sensor (Sensor 1) AFS Circuit High Voltage

Scheme 441

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and wait 1 minute.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1157 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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 4P connector.
Disconnect ECM/PCM connector C (49P).
Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 1 and ECM/PCM connector terminal C29. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (C29) and the A/F sensor (Sensor 1), then go to step 12 .
Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 2 and ECM/PCM connector terminal C30. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (C30) and the A/F sensor (Sensor 1), then go to step 12 .
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1157 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 . If the connector and terminal fits are OK, go to step 18 . NO -Go to step 17.
Monitor the OBD STATUS for DTC P1157 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 16 , go to the indicated DTC's troubleshooting 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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1157 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 19 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 21.
Monitor the OBD STATUS for DTC P1157 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 20 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 19 . If the ECM/PCM was substituted, go to step 1 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P1172: A/F Sensor (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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Monitor the OBD STATUS for DTC P1172 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 idling until a result comes on. If the screen indicates OUT OF CONDITION, go to step 3 and recheck.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1172 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.
Monitor the OBD STATUS for DTC P1172 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 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 442

Scheme 442: DTC P1297: ELD Circuit Low Voltage

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ELD 3P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECM/PCM connector terminal A24 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (A24) and the ELD, then go to step 13 . NO -Go to step 20 .
Turn the ignition switch to LOCK (0).
Replace the ELD (see «ELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine.
Turn on the headlights.
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine.
Turn on the headlights.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 443

Scheme 443: DTC P1298: ELD Circuit High Voltage

Scheme 444

Scheme 445

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ELD 3P connector.
Turn the ignition switch to ON (II).
Measure the voltage between ELD 3P connector terminal No. 1 and body ground. ELD 3P CONNECTOR Is there battery voltage? YES -Go to step 7. NO -Check the No. 7 ACG (15 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, repair open in the wire between the No. 7 ACG (15 A) fuse and the ELD, then go to step 13 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ELD 3P connector terminal No. 3 and ECM/PCM connector terminal A24. ELD 3P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A24) and the ELD, then go to step 13 .
Check for continuity between ELD 3P connector terminal No. 2 and body ground. ELD 3P CONNECTOR 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/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__left-engine-compartment-wire-harness-engine) ), then go to step 13 .
Replace the ELD (see «ELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS Is DTC P1298 indicated? YES -Go to step 18. NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P1549: Charging System High Voltage

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/C off Headlights off Rear window defogger off
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P1549 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl) ), 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.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/C off Headlights off Rear window defogger off
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
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.

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 ).

Turn the ignition switch to ON (II).
Clear the DTC with HDS.
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
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/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl__battery-test) ).
Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+ Bline). Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or the terminals, then go to step 9 .
Check for an open in the wire between the alternator and the under-hood fuse/relay box at the starter subharness. Is the harness OK? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl) ), 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.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed at 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
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.

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 446

Scheme 446: DTC P16BC: Alternator FR Terminal Circuit/IGP Circuit Low Voltage

Scheme 447

Scheme 448

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 connector or terminals, then go to step 18 .
Check the alternator mounting surfaces for corrosion. Are the mounting surfaces corroded? YES -Remove the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl) ). Clean all mounting surfaces, reinstall the alternator, then go to step 18 . NO -Go to step 3.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator.
Turn the ignition switch to LOCK (0).
Disconnect the alternator 4P connector.
Turn the ignition switch to ON (II).
Measure the voltage between alternator 4P connector terminal No. 1 and body ground. ALTERNATOR 4P CONNECTOR Is there battery voltage? YES -Go to step 13. NO -Repair open in the wire between the alternator (IG1 line) and the No. 7 ACG (15 A) fuse in the driver's under-dash fuse/relay box, then go to step 18 .
Measure the voltage between alternator 4P connector terminal No. 4 and body ground. ALTERNATOR 4P CONNECTOR Is there about 5 V? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/charging-system/#charging-system-4-cyl) ), then go to step 18 . NO -Go to step 14.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector B (49P).
Check for continuity between alternator 4P connector terminal No. 4 and ECM/PCM connector terminal B47. ALTERNATOR 4P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (B47) and the alternator, then go to step 18.
Turn the ignition switch to LOCK (0).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine.
Check under these conditions: A/Con Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
Hold the engine speed 2, 000 RPM (A/T in P or N, M/T in neutral) for 1 minute.
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 29 . If the ECM/PCM was substituted, go to step 1 . NO -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2183: ECT Sensor 2 Circuit Range/Performance Problem

Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 21 .
Turn the ignition switch to ON (II).
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.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 108 °F (42 °C) indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 21 . NO -Go to step 6.
Turn the ignition switch to LOCK (0).
Allow ECT sensor 2 to cool to the ambient temperature.
Note the ambient temperature.
Turn the ignition switch to ON (II).
Quickly note the value of ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 2 to 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 21 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
Start the engine, and let it idle for 10 minutes.
Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 99 °F (37 °C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 21 . NO -Go to step 14.
Let the engine idle 10 minutes.
Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 99 °F (37 °C) or less Indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ), then go to step 21 . NO -Go to step 16.
Turn the ignition switch to LOCK (0).
Allow ECT sensor 1 and ECT sensor 2 to cool to the ambient temperature.
Note the ambient temperature.
Quickly note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
Compare the value of ECT SENSOR 1 to the ambient temperature, and the value of ECT SENSOR 2 to the ambient temperature individually. Does either sensor differ more than 5.4 °F (3 °C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4 °F (3 °C) from the ambient temperature. Refill the cooling system (see «COOLANT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ), then go to step 21. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the ECM/PCM.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.

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 449

Scheme 449: DTC P2184: ECT Sensor 2 Circuit Low Voltage

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 2 2P connector.
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECT sensor 2 2P connector terminal No. 1 and body ground. ECT SENSOR 2 2P CONNECTOR Is there continuity? YES -Repair short in the wire between ECT sensor 2 and the ECM/PCM (A34), then go to step 13 . NO -Go to step 18 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 450

Scheme 450: DTC P2185: ECT Sensor 2 Circuit High Voltage

Scheme 451

Scheme 452

Scheme 453

Turn the ignition switch to ON (II).
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.
Turn the ignition switch to LOCK (0).
Disconnect the ECT sensor 2 2P connector.
Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire. ECT SENSOR 2 2P CONNECTOR
Turn the ignition switch to ON (II).
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 .
Turn the ignition switch to LOCK (0).
Remove the jumper wire from the ECT sensor 2 2P connector.
Turn the ignition switch to ON (II).
Measure the voltage between ECT sensor 2 2P connector terminal No. 1 and body ground. ECT SENSOR 2 2P CONNECTOR Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECT sensor 2 2P connector terminal No. 2 and ECM/PCM connector terminal A10. ECT SENSOR 2 2P CONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (A10) and ECT sensor 2, then go to step 22 .
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECT sensor 2 2P connector terminal No. 1 and ECM/PCM connector terminal A34. ECT SENSOR 2 2PCONNECTOR Is there continuity? YES -Go to step 27 . NO -Repair open in the wire between the ECM/PCM (A34) and ECT sensor 2, then go to step 22 .
Turn the ignition switch to LOCK (0).
Replace ECT sensor 2 (see «ECT SENSOR 1 REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
Reconnect all connectors.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCs troubleshooting

DTC P2195: A/F Sensor (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 ). 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, troubleshoot them first, then recheck for DTC P2195.

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 «MAP SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ). NO -Go to step 2.
Check the installation of the A/F sensor (Sensor 1). Is the A/F sensor loose or disconnected from the converter? YES -Go to step 7 . NO -Go to step 3.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, and let it idle for 2 minutes.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 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.
Turn the ignition switch to LOCK (0).
Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 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.
Monitor the OBD STATUS for DTC P2195 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. 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 indicated NOT COMPLETED, keep idling until a result comes on.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 15 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 17.
Monitor the OBD STATUS for DTC P2195 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 16 , go to the indicated DTC's troubleshooting. 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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

Turn the ignition switch to ON (II), and wait 2 seconds.
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 .
Clear the DTC with the HDS.
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.
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) A/T in D, M/T in 4th REL TP SENSOR between 16 and 28 degrees for at least 3 seconds
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. Check for something that may have clogged the intake air system. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
Check the intake air system for clogging or restrictions (foreign material, dirty air cleaner element, etc.). Is the intake air system clogged or restricted? YES -Remove the clog or restriction, then go to step 8. NO -Go to step 15.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Start the engine. Hold the engine speed at 3000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 28 degrees for at least 3 seconds
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.
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other pending or confirmed DTCs were indicated in step 13, go to the indicated DTC troubleshooting. • NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the ECM/PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 11 .
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine. Hold the engine speed at 3000 RPM without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
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 28 degrees for at least 3 seconds
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), the go to step 16 . If the ECM/PCM was substituted, go to step 1 NO -Go to step 19.
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other pending or confirmed DTCs were indicated in step 18, go to the indicated DTC troubleshooting. • NO -If the HDS 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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 16 . If the ECM/PCM was substituted, go to step 1 . If the HDS indicated 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 ).

Turn the ignition switch to ON (II).
Check the BARO SENSOR in the DATA LIST with the HDS. Is about 43 kPa (12.7 inHg, 323 mmHg), or 1.3 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

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 ).

Turn the ignition switch to ON (II).
Check the BARO SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.2 inHg, 1, 200 mmHg), or 4.49 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2238: A/F Sensor (Sensor 1) AFS+ 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 454

Scheme 454: DTC P2238: A/F Sensor (Sensor 1) AFS+ Circuit Low Voltage

Scheme 455

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 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 A/F sensor (Sensor 1) and the ECM/PCM.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 4P connector.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C29 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C29) and the A/F sensor (Sensor 1), then go to step 12 . NO -Go to step 9.
Reconnect ECM/PCM connector C (49P).
Turn the ignition switch to ON (II).
Measure the voltage between A/F sensor (Sensor 1) 4P connector terminal No. 1 and body ground. A/F SENSOR (SENSOR 1) 4P CONNECTOR Is the voltage about 2.2 V? YES -Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ), then go to step 12. NO -Go to step 18 .
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 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 . If the connector and terminal fits are OK, go to step 18 . NO -Go to step 17.
Monitor the OBD STATUS for DTC P2238 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 16 , go to the indicated DTC's troubleshooting. 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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 indicated? YES -If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 19 . If the ECM/PCM was substituted, go to step 1 . NO -Go to step 21.
Monitor the OBD STATUS for DTC P2238 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 20 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 19 . 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: A/F Sensor (Sensor 1) AFS-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 456

Scheme 456: DTC P2252: A/F Sensor (Sensor 1) AFS-Circuit Low Voltage

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 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.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the A/F sensor (Sensor 1) 4P connector.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C30 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (C30) and the A/F sensor (Sensor 1), then go to step 11 . NO -Go to step 10.
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 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 . If the connections and the terminals are OK, go to step 17 . NO -Go to step 16.
Monitor the OBD STATUS for DTC P2252 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 15 , go to the indicated DTC's troubleshooting. 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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
Start the engine, and let it idle.
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 indicated? YES -Go to step 1 and recheck. NO -Go to step 20.
Monitor the OBD STATUS for DTC P2252 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated DTC's troubleshooting. NO -If the screen indicates FAILED, go to step 1 . If the ECM/PCM was updated, substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ), then go to step 18 . If the screen indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean

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

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3, 000 RPM without load (A/T in P or N, IWT in neutral) until the radiator fan comes on, then let it idle.
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 35 seconds or more
Monitor the OBD STATUS for DTC P2270 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 H02S (Sensor 2) and the ECM/PCM. If the screen indicates NOT COMPLETED, go to step 3 and recheck.
Turn the ignition switch to LOCK (0).
Replace secondary H02S (Sensor 2) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.
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 35 seconds or more
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2270 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.
Monitor the OBD STATUS for DTC P2270 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. NO -If the screen indicates FAILED, check for poor connections or loose terminals at secondary H02S (Sensor 2) and the ECM/PCM, then go to step 1 . If the screen indicates NOT COMPLETED, go to step 11 .

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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

DTC P2A00: A/F Sensor (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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
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 throttle fully closed) for 5 seconds
Monitor the OBD STATUS for DTC P2A00 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.
Turn the ignition switch to LOCK (0).
Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__af-sensor-replacement) ).
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C) A/T in D, M/Tin3rd 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 throttle fully closed) for 5 seconds
Check for Pending or Confirmed DTCs with the HDS. Is DTC P2A00 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.
Monitor the OBD STATUS for DTC P2A00 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. 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 ).

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__substituting-the-ecmpcm) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated DTCs troubleshooting.

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 457

Scheme 457: DTC U0122: F-CAN Malfunction (ECM/PCM-VSA Modulator-Control Unit)

Scheme 458

Turn the ignition switch to ON (II).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dtc-u0029-f-can-malfunction-bus-off-ecmpcm) ). NO -Go to step 3.
Clear the DTC with the HDS.
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.
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 symptom troubleshooting for an 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect the VSA modulator-control unit 47P connector.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECM/PCM connector terminal A3 and VSA modulator-control unit 47P connector terminal No. 12. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A3) and the VSA modulator-control unit, then go to step 12 .
Check for continuity between ECM/PCM connector terminal A4 and VSA modulator-control unit 47P connector terminal No. 13. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Reconnect all connectors, and update the VSA modulator-control unit if it does not have the latest software (see «VSA MODULATOR-CONTROL UNIT UPDATE»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-update) ), or substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12. NO -Repair open in the wire between the ECM/PCM (A4) and the VSA modulator-control unit, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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 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.

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 459

Scheme 459: DTC U0131: F-CAN Malfunction (ECM/PCM-EPS Control Unit)

Scheme 460

Turn the ignition switch to ON (II).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dtc-u0029-f-can-malfunction-bus-off-ecmpcm) ). NO -Go to step 3.
Clear the DTC with the HDS.
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.
Start the engine, and watch the EPS indicator. Does the indicator come on and go off? YES -Go to step 6. NO -Turn the ignition switch to LOCK (0), and go to the symptom troubleshooting for an EPS indicator does not go off, and no DTCs are stored (see «EPS INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect EPS control unit connector D (28P).
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECM/PCM connector. terminal A3 and EPS control unit connector D (28P) terminal No. 1. EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A3) and the EPS control unit, then go to step 12 .
Check for continuity between ECM/PCM connector terminal A4 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ), 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/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ), then go to step 12. NO -Repair open in the wire between the ECM/PCM (A4) and the EPS control unit, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC U01'31 indicated? YES -Check for poor connections or loose terminals at the gauge control module, 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.

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 461

Scheme 461: DTC U0155: F-CAN Malfunction (ECM/PCM-Gauge Control Module)

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Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
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.
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/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-input-test) ).
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Remove the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
Disconnect the gauge control module 32P connector.
Disconnect ECM/PCM connector A (49P).
Check for continuity between ECM/PCM connector terminal A3 and gauge control module 32P connector terminal No. 22. GAUGE CONTROL MODULE 32P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A3) and the gauge control module, then go to step 12 .
Check for continuity between ECM/PCM connector terminal A4 and gauge control module 32P connector terminal No. 21. GAUGE CONTROL MODULE 32P CONNECTOR Is there continuity? YES -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__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 (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ), then go to step 12. NO -Repair open in the wire between the ECM/PCM (A4) and the gauge control module, then go to step 12.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Reset the ECM/PCM with the HDS.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
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.

DTC U0300: PGM-FI System and A/T System Program Version Mismatch

Do the PCM update procedure (PGM-FI system and A/T system) (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ).
Check for Pending or Confirmed DTCs with the HDS. Is DTC U0300 indicated? YES -Replace the original PCM (see «ECM/PCM REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.

Scheme 463

Scheme 463: F-CAN Circuit Troubleshooting

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Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Measure the resistance between ECM/PCM connector terminals A3 and A4. ECM/PCM CONNECTOR A (43P) Is there about 81-107ohms? YES -Go to step 15 . NO -Go to step 5.
Disconnect these connectors: Gauge control module 32P (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). VSA modulator-control unit 47P (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). Yaw rate-lateral acceleration sensor 4P (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ). EPS control unit D (28P) (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). SRS unit A (39P) (see «SRS UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ). TPMS control unit 20P (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system-4-cyl__tpms-control-unit-replacement) ) AcuraLink control unit (XM receiver) connector A (32P) (USA model with navigation) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#audio-system-4-cyl) ).
Check for continuity between ECM/PCM connector terminals A3 and A4. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wires between ECM/PCM terminals A3 and A4. NO -Go to step 7.
Check for continuity between ECM/PCM connector terminal A3 and gauge control module 32P connector terminal No. 22. GAUGE CONTROL MODULE 32P CONNECTOR Is there continuity? YES -Go to step 8. NO -Repair open in the wire between the ECM/PCM (A3) and the gauge control module.
Check for continuity between ECM/PCM connector terminal A3 and VSA modulator-control unit 47P connector terminal No. 12. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 9. NO -Repair open in the wire between the ECM/PCM (A3) and the VSA modulator-control unit.
Check for continuity between ECM/PCM connector terminal A3 and EPS control unit connector D (28P). EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Go to step 10. NO -Repair open in the wire between the ECM/PCM (A3) and the EPS control unit.
Check for continuity between ECM/PCM connector terminal A4 and gauge control module 32P connector terminal No. 21. GAUGE CONTROL MODULE 32P CONNECTOR Is there continuity? YES -Go to step 11. NO -Repair open in the wire between the ECM/PCM (A4) and the gauge control module.
Check for continuity between ECM/PCM connector terminal A4 and VSA modulator-control unit 47P connector terminal No. 13. VSA MODULATOR-CONTROL UNIT 47P CONNECTOR Is there continuity? YES -Go to step 12. NO -Repair open in the wire between the ECM/PCM (A4) and the VSA modulator-control unit.
Check for continuity between ECM/PCM connector terminal A4 and EPS control unit connector D (28P) terminal No. 15. EPS CONTROL UNIT CONNECTOR D (28P) Is there continuity? YES -Go to step 13. NO -Repair open in the wire between the ECM/PCM (A4) and the EPS control unit.
Reconnect the VSA modulator-control unit 47P connector.
Measure the resistance between ECM/PCM connector terminals A3 and A4. ECM/PCM CONNECTOR A (49P) Is there about 108-132 ohms? YES -Go to step 15. NO -Substitute a known-good VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ).
Disconnect these connectors: Gauge control module 32P (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). VSA modulator-control unit 47P (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). Yaw rate-lateral acceleration sensor 4P (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ). EPS control unit D (28P) (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). SRS unit A (39P) (see «SRS UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ). TPMS control unit 20P (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system-4-cyl__tpms-control-unit-replacement) ) AcuraLink control unit (XM receiver) connector A (32P) (USA model with navigation) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#audio-system-4-cyl) ).
Check for continuity between ECM/PCM connector terminal A3 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wire between ECM/PCM terminal A3 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the AcuraLink control unit (XM receiver) (USA model with navigation), or the DLC. NO -Go to step 17.
Check for continuity between ECM/PCM connector terminal A4 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wire between ECM/PCM terminal A4 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the TPMS control unit, the AcuraLink control unit (XM receiver) (USA model with navigation), or the DLC. NO -Go to step 18.
Reconnect all connectors.
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Disconnect the gauge control module 32P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ). NO -Go to step 22.
Turn the ignition switch to LOCK (0).
Reconnect the gauge control module 32P connector.
Disconnect the VSA modulator-control unit 47P connector.
Turn the ignition switch to ON (II), 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 26.
Turn the ignition switch to LOCK (0).
Reconnect the VSA modulator-control unit 47P connector.
Disconnect the yaw rate-lateral acceleration sensor 4P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the yaw rate-lateral acceleration sensor (see «YAW RATE-ACCELERATION SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl__yaw-rate-acceleration-sensor-replacement) ). NO -Go to step 30.
Turn the ignition switch to LOCK (0).
Reconnect the yaw rate-lateral acceleration sensor 4P connector.
Disconnect EPS control unit connector D (28P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the EPS control unit (see «EPS CONTROL UNIT REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ). NO -Go to step 34.
Turn the ignition switch to LOCK (0).
Reconnect EPS control unit connector D (28P).
Disconnect SRS unit connector A (39P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the SRS unit (see «SRS UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ). NO -Go to step 38.
Turn the ignition switch to LOCK (0).
Reconnect SRS unit connector A (39P).
Disconnect the TPMS control unit 20P connector.
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system-4-cyl__tpms-control-unit-replacement) ). NO - USA model with navigation: Go to step 42. USA model without navigation, Canada model: Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
Turn the ignition switch to LOCK (0).
Reconnect the TPMS control unit 20P connector.
Disconnect AcuraLink control unit (XM receiver) connector A (32P).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the AcuraLink control unit (XM receiver) (see «ACURALINK CONTROL UNIT (XM RECEIVER) REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/entertainment-systems/#audio-system-4-cyl) ). NO -Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).

Scheme 474

Scheme 474: MIL Circuit Troubleshooting

Turn the ignition switch to ON (II).
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__self-diagnostic-function) ). Does the MIL flash? YES -Go to step 3. NO -Substitute a known-good gauge control module, and recheck. If the symptom/indication goes away with a known-good gauge control module, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__gauge-control-module-replacement) ).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
Turn the ignition switch to LOCK (0).
Disconnect ECM/PCM connector A (49P), then disconnect the HDS.
Check for continuity between ECM/PCM connector terminal A32 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Repair short in the wire between the ECM/PCM (A32) and the EPS control unit or the DLC. NO -Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__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 problems.

Scheme 475

Scheme 475: DLC Circuit Troubleshooting

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Turn the ignition switch to LOCK (0).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Go to step 4. NO -Go to step 23 .
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 DTCs troubleshooting. 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 TPMS, go to step 9 . If the HDS does not communicate with the EPS system, go to step 11 . If the HDS does not communicate with the IMMOBI (immobilizer) system, go to step 13 . If the HDS does not communicate with the BODY ELECTRICAL system, go to step 15 .
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the SRS indicator. Does the SRS indicator come on and go off? YES -Go to step 17 . NO -Go to the SRS symptom troubleshooting for SRS indicator stays on, but no DTCs are stored, or cannot be read (see «SYMPTOM TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/airbag/#srs-supplemental-restraint-system-4-cyl) ).
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the VSA indicator. Does the VSA indicator come on and go off? YES -Go to step 17 . NO -Go to the VSA system symptom troubleshooting for an 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/tsx/ii-2008-2014/remont/anti-locktraction-control/#vsa-system-components-4-cyl) ).
Turn the ignition switch to LOCK (0).
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 17 . NO -Go to the TPMS symptom troubleshooting for TPMS indicator does not go off, and no DTCs are stored (see «TPMS INDICATOR DOES NOT COME ON, AND NO DTCS ARE STORED»(/acura/tsx/ii-2008-2014/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system-4-cyl__tpms-indicator-does-not-come-on) ).
Turn the ignition switch to LOCK (0).
Start the engine, and watch the EPS indicator. Does the EPS indicator come on and go off? YES -Go to step 17 . NO -Go to the EPS system symptom troubleshooting for EPS indicator does not go off, and no DTCs are stored (see «EPS INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED»(/acura/tsx/ii-2008-2014/remont/electronic-steering/#electronic-power-steering-eps-system-4-cyl) ).
Turn the ignition switch to LOCK (0).
Turn the ignition switch to ON (II), and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES -Go to the immobilizer system troubleshooting (see «SYMPTOM TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/door-locks-anti-theft-systems/#immobilizer-system-4-cyl) ). NO -Go to step 17 .
Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/tsx/ii-2008-2014/remont/gauges-instrument-panels/#gauges-4-cyl__self-diagnostic-function) ).
Check the gauge display. Is Error 2 indicated? YES -Check for B-CAN system DTCs (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl) ). NO -Go to step 17.
Turn the ignition switch to LOCK (0), then do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl) ), and wait at least 3 minutes before starting work.
Disconnect the HDS from the DLC.
Check for continuity between DLC terminal No. 7 and body ground. DATA LINK CONNECTOR (DLC) Is there continuity? YES -Go to step 20. NO -Go to step 21 .
Continue to check for continuity between DLC terminal No. 7 and body ground while disconnecting these connectors, one at a time: SRS unit connector A (39P) VSA modulator-control unit 47P connector TPMS control unit 20P connector EPS control unit connector D (28P) Immobilizer-keyless control unit 7P connector Audio unit connector A (24P) (without navigation) Audio-navigation unit connector A (24P) (with navigation) Driver's under-dash fuse/relay box (Q) (20P) connector 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 (K-line) and the VSA modulator-control unit, the SRS unit, the TPMS control unit, the EPS control unit, the immobilizer-keyless control unit, the audio unit, or the driver's under-dash fuse/relay box.
Connect DLC terminal No. 7 to body ground with a jumper wire. DATA LINK CONNECTOR (DLC)
Check for continuity between body ground and these connector terminals: TERMINAL CONTINUITY REFERENCE CHART Connector Terminal SRS unit A (39P) No. 18(LTBLU) VSA modulator-control unit 47P No. 10(LTBLU) TPMS control unit 20P No. 7(LTBLU) EPS control unit D (28P) No. 17(LTBLU) Immobilizer-keyless control unit7P No. 5(LTBLU) Audio unit A (24P) (without navigation) No. 3(LTBLU) Audio-navigation unit connector A (24P) (with navigation) No. 3(LTBLU) Driver's under-dash fuse/relay box (Q) (20P) No. 16(LTBLU) Is there continuity between 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) and the appropriate connector.
Check for B-CAN system DTCs without the HDS (see «TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS)»(/acura/tsx/ii-2008-2014/remont/communication-devices/#multiplex-integrated-control-system-4-cyl__troubleshooting-b-can-system-diagnosis-test) ). Is DTC U0029 and/or U0100 indicated? YES -Go to step 34 . NO -Go to step 24.
Turn the ignition switch to LOCK (0).
Disconnect the HDS from the DLC.
Measure the voltage between DLC terminal No. 16 and body ground. DATA LINK CONNECTOR (DLC) Is there battery voltage? YES -Go to step 27. 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.
Measure the voltage between DLC terminals No. 4 and No. 16. DATA LINK CONNECTOR (DLC) Is there battery voltage? YES -Go to step 28 . NO -Repair open in the wire between DLC terminal No. 4 and body ground (G501) (see «DASHBOARD WIRE HARNESS (VIEW OF DRIVER'S SIDE)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl) ).
Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Disconnect the HDS from the DLC.
Check for continuity between ECM/PCM connector terminal A3 and DLC terminal No. 6. DATA LINK CONNECTOR (DLC) Is there continuity? YES -Go to step 33. NO -Repair open in the wire between DLC terminal No. 6 and the ECM/PCM (A3).
Check for continuity between ECM/PCM connector terminal A4 and DLC terminal No. 14. DATA LINK CONNECTOR (DLC) Is there continuity? YES -Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -Repair open in the wire between DLC terminal No. 14 and the ECM/PCM (A4).
Try to start the engine. Does the engine start and idle smoothly? YES -Go to the F-CAN circuit troubleshooting (see «F-CAN CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl) ). NO -Go to step 35.
Turn the ignition switch to LOCK (0).
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. If the wire is OK, go to step 37. NO -Repair short in the wire between the No. 3-1 IG MAIN (50 A) fuse and the ignition switch. Also replace the No. 3-1 IG MAIN (50 A) fuse.
Inspect the No. 17 Fl MAIN (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 44 . NO -Go to step 38.
Remove the blown No. 17 Fl MAIN (15 A) fuse from the under-hood fuse/relay box.
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 4 individually. PGM-FI MAIN RELAY 1 4P CONNECTOR Is there continuity? YES -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-4-cyl__removal-and-installation) ). Also replace the No. 17FIMAIN (15A)fuse. NO -Go to step 41.
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 A (49P) Each injector 2P connector Camshaft position (CMP) sensor B 3P connector Crankshaft position (CKP) sensor 3P connector MAF sensor/IAT sensor 5P connector Electronic throttle control system (ETCS) control relay PGM-FI MAIN RELAY 1 4P CONNECTOR 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, reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -Go to step 42.
Disconnect these parts or connectors: PGM-FI main relay 2 ECM/PCM connector A (49P) Each injector 2P connector Camshaft position (CMP) sensor B 3P connector Crankshaft position (CKP) sensor 3P connector MAF sensor/IAT sensor 5P connector Electronic throttle control system (ETCS) control relay
Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground. PGM-FI MAIN RELAY 1 4P CONNECTOR 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. 17FIMAIN (15A)fuse.
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 56 . NO -Go to step 45.
Remove the blown No. 9 FUEL PUMP (20 A) fuse from the driver's under-dash fuse/relay box.
Remove PGM-FI main relay 2 (A) from the driver's under-dash fuse/relay box.
Test PGM-FI main relay 2 (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). Is the relay OK? YES -Go to step 48. NO -Replace PGM-FI main relay 2. Also replace the No. 9 FUEL PUMP (20 A) fuse.
Check for continuity between PGM-FI main relay 2 4P connector terminal No. 2 and body ground. PGM-FI MAIN RELAY 2 4P CONNECTOR Is there continuity? YES -Go to step 49 . NO -Go to step 52 .
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector C (49P).
Check for continuity between ECM/PCM connector terminal C10 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Repair short in the wire between the No. 9 FUEL PUMP (20 A) fuse and the ECM/PCM (C10), 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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ).
Remove the rear seat cushion; sedan model (see «REAR SEAT REMOVAL/INSTALLATION - SEDAN»(/acura/tsx/ii-2008-2014/remont/seats/#seats-4-cyl) ), sport wagon model (see «REAR SEAT REMOVAL/INSTALLATION - SPORT WAGON»(/acura/tsx/ii-2008-2014/remont/seats/#seats-4-cyl) ).
Remove the fuel tank unit access panel from the floor (see «FUEL TANK UNIT REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl__fuel-tank-unit-removal-and-installation) ).
Disconnect the fuel pump 4P connector.
Check for continuity between fuel pump 4P connector terminal No. 2 and body ground. FUEL PUMP 4P CONNECTOR 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/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl) ). Also replace the No. 9 FUEL PUMP (20 A) fuse.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connectors A (49P) and C (49P).
Turn the ignition switch to ON (II).
Measure the voltage between ECM/PCM connector terminal C10and body ground. ECM/PCM CONNECTOR C (49P) Is there battery voltage? YES -Go to step 60. NO -Repair open in the wire between the No. 9 FUEL PUMP (20 A) fuse and the ECM/PCM (C10).
Measure the voltage between ECM/PCM connector terminal A7 and body ground. ECM/PCM CONNECTOR A (49P) Is there battery voltage? YES -Go to step 65 . NO -Go to step 61.
Turn the ignition switch to LOCK (0).
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 4 and body ground. PGM-FI MAIN RELAY 1 4P CONNECTOR Is there battery voltage? YES -Go to step 64. NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-4-cyl__removal-and-installation) ).
Check for continuity between PGM-FI main relay 1 4P connector terminal No. 3 and ECM/PCM connector terminal A7. PGM-FI MAIN RELAY 1 4P CONNECTOR Is there continuity? YES -Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). If the relay is OK, reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) ). NO -Repair open in the wire between the ECM/PCM (A7) and PGM-FI main relay 1.
Turn the ignition switch to LOCK (0).
Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 1 and body ground. PGM-FI MAIN RELAY 1 4P CONNECTOR Is there battery voltage? YES -Go to step 68. NO -Check the under-hood fuse/relay box, and replace it if needed (see «REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/fuses-circuit-breakers/#under-hood-fuserelay-box-4-cyl__removal-and-installation) ).
Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and ECM/PCM connector terminal A9. PGM-FI MAIN RELAY 1 4P CONNECTOR Is there continuity? YES -Go to step 69 . NO -Repair open in the wire between the ECM/PCM (A9) and PGM-FI main relay 1.
Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/tsx/ii-2008-2014/remont/body-electrical/#relays-4-cyl__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 70. NO -Replace PGM-FI main relay 1.
Disconnect ECM/PCM connector B (49P).
Check for continuity between body ground and ECM/PCM connector terminals B1, B10, C2, C44, and C48 individually. ECM/PCM CONNECTOR B (49P) ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Go to step 72. NO -Repair open in the wire between the ECM/PCM (B1, B10, C2, C44, C48) and G101; A/T (see «ENGINE WIRE HARNESS (A/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-at) ), M/T (see «ENGINE WIRE HARNESS (M/T)»(/acura/tsx/ii-2008-2014/remont/body-electrical/#connectors-and-harnesses-4-cyl__engine-wire-harness-mt) ).
Check for continuity between ECM/PCM connector terminal C13 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Go to step 73. NO - A/T: Go to step 74 . M/T: Go to step 76 .
Continue to check for continuity between ECM/PCM connector terminal C13and body ground, while disconnecting these connectors, one at a time: MAP sensor 3P connector Output shaft (countershaft) speed sensor 3P connector. 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 wires between the ECM/PCM (C13) and the MAP sensor, or the output shaft (countershaft) speed sensor.
Check for continuity between PCM connector terminal B19 and body ground. PCM CONNECTOR B (49P) Is there continuity? YES -Go to step 75. NO -Go to step 76 .
Continue to check for continuity between PCM connector terminal B19and body ground while disconnecting the input shaft (mainshaft) speed sensor 3P connector. Is there continuity? YES -Repair short in the wire between the PCM (B19) and the input shaft (mainshaft) speed sensor. NO -Replace the input shaft (mainshaft) speed sensor (see «INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/automatic-trans/#automatic-transmission-4-cyl) ).
Check for continuity between ECM/PCM connector terminal C12 and body ground. ECM/PCM CONNECTOR C (49P) Is there continuity? YES -Go to step 77. NO -Go to step 78 .
Continue to check for continuity between ECM/PCM connector terminal C12 and body ground while disconnecting the throttle body 6P connector. Is there continuity? YES -Repair short in the wire between the ECM/PCM (C12) and the throttle body. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl__throttle-body-removalinstallation) ).
Check for continuity between ECM/PCM connector terminal A26 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Go to step 79. NO -Go to step 80 .
Continue to check for continuity between ECM/PCM connector terminal A26 and body ground while disconnecting the APP sensor 6P connector. Is there continuity? YES -Repair short in the wire between the ECM/PCM (A26) and the APP sensor. NO -Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/engine-control-systems/#electronic-throttle-control-system-4-cyl) ).
Check for continuity between ECM/PCM connector terminal A25 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Go to step 81. NO -Go to step 82 .
Continue to check for continuity between ECM/PCM connector terminal A25 and body ground while disconnecting the APP sensor 6P connector. Is there continuity? YES -Repair short in the wire between the ECM/PCM (A25) and the APP sensor. NO -Replace the accelerator pedal module (see «ACCELERATOR PEDAL MODULE REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/engine-control-systems/#electronic-throttle-control-system-4-cyl) ).
Check for continuity between ECM/PCM connector terminal A20 and body ground. ECM/PCM CONNECTOR A (49P) Is there continuity? YES -Go to step 83. NO -Reconnect all connectors, and update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ), or substitute a known-good ECM/PCM (see «SUBSTITUTING THE ECM/PCM»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl__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/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-replacement) )
Continue to check for continuity between ECM/PCM connector terminal A20 and body ground while disconnecting these connector, one at a time: FTP sensor 3P connector A/C pressure sensor 3P connector 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 ECM/PCM (A20) and the FTP sensor, or the A/C pressure sensor.

Scheme 505

Scheme 505: Injector Replacement

Scheme 506

Relieve the fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/tsx/ii-2008-2014/remont/fuel-system/#fuel-supply-system-4-cyl__fuel-pressure-relieving) ).
Remove the engine cover.
Remove the quick-connect fitting cover (A), then disconnect the quick-connect fitting (B).
Disconnect the injector connectors (C) and the engine mount control solenoid valve connector (D).
Remove the ground cable bolts (G101 and G102) (E).
Remove the fuel rail mounting nuts (F) from the fuel rail (G).
Remove the fuel rail and the injectors from the injector base.
Remove the injector clips (H) from the fuel rail.
Remove the injectors from the fuel rail.
Coat the new O-rings (black) (A) with clean engine oil, and insert the injectors (B) into the fuel rail (C).
Install the injectors clips (D).
Coat the new O-rings (brown) (E) with clean engine oil.
Install the fuel rail and the injectors in the injector base (F).
Install the fuel rail mounting nuts (G) and the ground cable bolts (G101 and G102) (H).
Connect the injector connectors (I) and the engine mount control solenoid valve connector (J).
Connect the quick-connect fitting (K), and quick-connect fitting cover (L).
Turn the ignition switch to ON (II), 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.
Reinstall the engine cover.

A/F Sensor Replacement

Special Tools Required

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

Scheme 507

Scheme 507: A/F Sensor Replacement

Disconnect the A/F sensor 4P connector (A), then remove the A/F sensor (B).
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 508

Scheme 508: Secondary HO2S Replacement

Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#fenderwell-4-cyl__front-splash-shield-replacement) ).
Disconnect the secondary HO2S 4P connector (A), then remove secondary HO2S (B).
Install the parts in the reverse order of removal.

Scheme 509

Scheme 509: CMP Sensor B Replacement

Scheme 510

Disconnect the connector (A) and hoses (B) from the EVAP canister purge valve (C), then remove the EVAP canister purge valve assembly.
Disconnect the CMP sensor B connector (A).
Remove CMP sensor B.
Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 511

Scheme 511: CKP Sensor Replacement

Raise the vehicle on a lift. NOTE: Make sure the vehicle is level, because engine oil will drip out when you remove the sensor.
Remove the CKP sensor cover (A).
Disconnect the CKP sensor connector (B).
Remove the CKP sensor (C).
Install the parts in the reverse order of removal with a new O-ring (D).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).
Check the engine oil level, and add more oil if needed.

Scheme 512

Scheme 512: MAP Sensor Replacement

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

Scheme 513

Scheme 513: MAF Sensor/IAT Sensor Replacement

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

Scheme 514

Scheme 514: ECT Sensor 1 Replacement

Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ).
Disconnect the ECT sensor 1 connector (A).
Remove ECT sensor 1 (B).
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/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ).

Scheme 515

Scheme 515: ECT Sensor 2 Replacement

Remove the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#fenderwell-4-cyl__front-splash-shield-replacement) ).
Drain the engine coolant (see «COOLANT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ).
Disconnect the ECT sensor 2 connector (A), then remove ECT sensor 2 (B).
Install ECT sensor 2 with a new O-ring (C).
Install the front splash shield (see «FRONT SPLASH SHIELD REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/exterior-body-panels/#fenderwell-4-cyl__front-splash-shield-replacement) ).
Refill the radiator with engine coolant (see «COOLANT REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/cooling-fan/#engine-cooling-system-4-cyl) ).

M/T

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

Scheme 516

Scheme 516: M/T

Disconnect the output shaft (countershaft) speed sensor connector (A).
Remove the output shaft (countershaft) speed sensor (B).
Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 517

Scheme 517: Knock Sensor Replacement

Remove the intake manifold (see «INTAKE MANIFOLD REMOVAL AND INSTALLATION»(/acura/tsx/ii-2008-2014/remont/exhaust/#intake-manifold-and-exhaust-system-4-cyl) ).
Disconnect the knock sensor connector (A).
Remove the knock sensor (B).
Install the parts in the reverse order of removal.

Scheme 518

Scheme 518: ELD Replacement

Scheme 519

Scheme 520

Scheme 521

Do the battery terminal disconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl) ).
Remove the upper cover (A), then remove the two positive (+) terminals (B).
Remove the under-hood fuse/relay box (C) from the bracket.
Remove the lower cover (A).
Disconnect the ELD 3P connector (B).
Remove the fuses (A, B).
Release the three lock tabs (A), then remove the ELD (B).
Install the parts in the reverse order of removal.
Do the battery terminal reconnection procedure (see «BATTERY TERMINAL DISCONNECTION AND RECONNECTION»(/acura/tsx/ii-2008-2014/remont/body-electrical/#battery-4-cyl) ).

ECM/PCM Update

Special Tools Required

Honda Diagnostic System (HDS) tablet tester
Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
HDS pocket tester
GNA600 and an iN workstation with the latest HDS software version
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 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) during the update. If there is a problem with the update, leave the ignition switch in ON (II). To prevent ECM/PCM damage, do not operate anything electrical (headlights, audio system, brakes, A/C, power windows, moonroof (if equipped), door locks, etc.) during the update. To ensure the latest program is installed, do an ECM/PCM update whenever the ECM/PCM is substituted or replaced. You cannot update an 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) when you disconnect the HIM from the data link connector (DLC). This will prevent ECM/PCM damage.

Scheme 522

Turn the ignition switch to ON (II), but do not start the engine.
Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Make sure the HDS communicates with the ECM/PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dlc-circuit-troubleshooting) ).
Exit the HDS diagnostic system, then select the update mode, and follow the prompts to update the ECM/PCM.
If the software in the ECM/PCM is the latest, disconnect the updating tools 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 (A/T), make sure you update both. NOTE: If the ECM/PCM update system requires you to cool the ECM/PCM, follow the instructions on the screen. If you run into a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100%, D (A/T) 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). Connect a jumper battery (do not connect a battery charger). Shut down the updating tool. Disconnect the updating tool from the DLC. Reboot the updating tool. Reconnect the updating tool to the DLC, and do the update again.
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).

ECM/PCM Replacement

Special Tools Required

Honda Diagnostic System (HDS) tablet tester
Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
HDS pocket tester
GNA600 and an iN workstation with the latest HDS software version
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 has the latest HDS software version.

Scheme 523

Scheme 524

Scheme 525

Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
Turn the ignition switch to ON (II).
Make sure the HDS communicates with the ECM/PCM and other vehicle systems. If it doesn't, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__dlc-circuit-troubleshooting) ). If you are returning from the DLC circuit troubleshooting, skip steps 4 through 9, 19 through 24, and 27 through 29, and do these procedures after replacing the ECM/PCM: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/lubrication-system/#engine-lubrication-4-cyl) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/lubrication-system/#engine-lubrication-4-cyl__engine-oil-filter-replacement) ). Replace the ATF (A/T) (see «ATF REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/automatic-trans/#automatic-transmission-4-cyl) ). Clean the throttle body (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl) ).
Select the PGM-FI system with the HDS.
Select the REPLACE ECM/PCM MENU, then 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.
A/T: Select the A/T system with the HDS.
A/T: Select the REPLACE TCM/PCM MENU, then READ DATA, and follow the screen prompts. NOTE: A/T: Doing this step copies (READS) the ATF life data from the original PCM so you can later download (WRITES) it into the new PCM. A/T: If READ DATA indicates FAILED, continue with this procedure.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Remove the ECM/PCM cover (A).
Remove the battery setting plate (B), and reposition the battery away from the ECM/PCM. NOTE: Do not disconnect the battery terminals.
Remove the bolts (D).
Disconnect ECM/PCM connectors A, B, and C, then remove the ECM/PCM (E). NOTE: ECM/PCM connectors A, B, and C have symbols (A=[], B=delta, C=o) embossed on them for identification. Canada model: When disconnecting the ECM/PCM connectors, remove the ECM/PCM sub bracket (F).
Install the parts in the reverse order of removal.
Turn the ignition switch to ON (II).
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.
If the READ DATA (engine oil life) failed in step 5 , go to step 20 (A/T) or step 23 (M/T). Otherwise, go to step 18.
Select the PGM-FI system with the HDS.
Select the REPLACE ECM/PCM MENU, then WRITE DATA, and follow the screen prompts. NOTE: If the WRITE DATA indicates FAILED, continue with this procedure.
A/T: If the READ DATA (ATF life) failed in step 6 , go to step 23 . Otherwise go to step 23.
A/T: Select the A/T SYSTEM with the HDS.
A/T: Select the REPLACE TCM/PCM MENU, then WRITE DATA, and follow the screen prompts. NOTE: A/T: If the WRITE DATA indicates FAILED, continue with this procedure.
Select IMMOBI system with the HDS.
Enter the immobilizer ECM/PCM code that you got from the iN, and use the ECM/PCM replacement procedure in the IMMOBI MENU of the HDS; it allows you to start the engine.
If the READ DATA failed in step 7, or the WRITE DATA failed in step 22, replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/lubrication-system/#engine-lubrication-4-cyl) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/lubrication-system/#engine-lubrication-4-cyl__engine-oil-filter-replacement) ), then go to step 26 (A/T) or step 27 (M/T).
A/T: If the READ DATA failed in step 7 or the WRITE DATA failed in step 22 , replace the ATF (see «ATF REPLACEMENT»(/acura/tsx/ii-2008-2014/remont/automatic-trans/#automatic-transmission-4-cyl) ), then go to step 27.
Select PGM-FI system, and reset the ECM/PCM with the HDS.
Clean the throttle body (see «THROTTLE BODY CLEANING»(/acura/tsx/ii-2008-2014/remont/mechanical/#intake-air-system-4-cyl__throttle-body-cleaning) ).
Update the ECM/PCM if it does not have the latest software (see «ECM/PCM UPDATE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#pgm-fi-system-4-cyl__ecmpcm-update) ).
Do the ECM/PCM idle learn procedure (see «ECM/PCM IDLE LEARN PROCEDURE»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#idle-control-system-4-cyl__ecmpcm-idle-learn-procedure) ).
Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/tsx/ii-2008-2014/remont/testing-diagnostics/#fuel-and-emissions-systems-4-cyl) ).

Pgm-Fi System (4-cyl) Acura TSX II

Scheme 356

Scheme 357

DTC P0101: MAF Sensor Circuit Range/Performance Problem

DTC P0102: MAF Sensor Circuit Low Voltage

Scheme 358

Scheme 359

Scheme 360

Scheme 361

DTC P0103: MAF Sensor Circuit High Voltage

Scheme 362

Scheme 363

DTC P0107: MAP Sensor Circuit Low Voltage

Scheme 364

Scheme 365

Scheme 366

DTC P0108: MAP Sensor Circuit High Voltage

Scheme 367

Scheme 368

Scheme 369

Scheme 370

DTC P0111: IAT Sensor Circuit Range/Performance Problem

DTC P0112: IAT Sensor Circuit Low Voltage

Scheme 371

DTC P0113: IAT Sensor Circuit High Voltage

Scheme 372

Scheme 373

Scheme 374

Scheme 375

DTC P0116: ECT Sensor 1 Range/Performance Problem

DTC P0117: ECT Sensor 1 Circuit Low Voltage

Scheme 376

DTC P0118: ECT Sensor 1 Circuit High Voltage

Scheme 377

Scheme 378

Scheme 379

Scheme 380

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

DTC P0128: Cooling System Malfunction

DTC P0133: A/F Sensor (Sensor 1) Malfunction/Slow Response

DTC P0134: A/F Sensor (Sensor 1) Heater System Malfunction

DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

Scheme 381

Scheme 382

Scheme 383

Scheme 384

Scheme 385

Scheme 386

Scheme 387

Scheme 388

Scheme 389

DTC P0137: Secondary H02S (Sensor 2) Circuit Low Voltage

Scheme 390

Scheme 391

Scheme 392

DTC P0138: Secondary H02S (Sensor 2) Circuit High Voltage

Scheme 393

Scheme 394

Scheme 395

DTC P0139: Secondary H02S (Sensor 2) Slow Response

DTC P0141: Secondary H02S (Sensor 2) Heater Circuit Malfunction

Scheme 396

Scheme 397

Scheme 398

Scheme 399

Scheme 400

Scheme 401

Scheme 402

DTC P0171: Fuel System Too Lean; DTC P0172: Fuel System Too Rich

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 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

Scheme 403

Scheme 404

Scheme 405

Scheme 406

Scheme 407

DTC P0325: Knock Sensor Circuit Malfunction

Scheme 408

Scheme 409

Scheme 410