Pgm-Fi System Acura RDX I рестайлинг

Scheme 91

Scheme 92

DTC P0096: IAT Sensor 2 Circuit Range/Performance Problem

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

1. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and IAT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 15 .
2. Remove IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
3. Allow IAT sensor 2 to cool to ambient temperature.
4. Note the ambient temperature.
5. Connect IAT sensor 2 to the 2P connector, but do not install the sensor onto the intake manifold.
6. Turn the ignition switch to ON (II).
7. Note the value of IAT SENSOR 2 quickly in the DATA LIST with the HDS.
8. Compare the value of IAT SENSOR 2 and the ambient temperature. Does the value of IAT SENSOR 2 differ 5.4°F (3°C) or more from ambient temperature? YES -Go to step 13 . NO -Go to step 9.
9. Disconnect IAT sensor 2 from its 2P connector.
10. Using a heat gun, blow hot air on IAT sensor 2 for a few seconds. Do not apply the heat longer than a few seconds or you will damage the sensor.
11. Connect IAT sensor 2 to its 2P connector, but do not install the sensor onto the intake manifold.
12. Check IAT SENSOR 2 in the DATA LIST with the HDS. Does IAT SENSOR 2 change 58°F (32°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at IAT sensor 2 and the PCM. NO -Go to step 13.
13. Turn the ignition switch to LOCK (0).
14. Replace IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
15. Turn the ignition switch to ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0096 indicated? YES -Check for poor connections or loose terminals at IAT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0097: IAT 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 93

1. Turn the ignition switch to ON (II).
2. Check IAT 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 IAT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the IAT sensor 2 2P connector.
5. Turn the ignition switch to ON (II).
6. Check IAT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F(180°C) or more, or 0.08 V or less indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector B (44P).
10. Check for continuity between IAT sensor 2P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between IAT sensor 2 and the PCM (B31), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0).
12. Replace IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0097 indicated? YES -Check for poor connections or loose terminals at IAT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0097 indicated? YES -Check for poor connections or loose terminals at IAT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0098: IAT 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 94

Scheme 95

Scheme 96

Scheme 97

1. Turn the ignition switch to ON (II).
2. Check IAT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 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 IAT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the IAT sensor 2 2P connector.
5. Connect IAT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II).
7. Check IAT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from the IAT sensor 2 2P connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between IAT sensor 2 2P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check for continuity between PCM connector terminal B33 and IAT sensor 2 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B33) and IAT sensor 2, then go to step 22 .
16. Turn the ignition switch to LOCK (0).
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector B (44P).
19. Check for continuity between PCM connector terminal B31 and IAT sensor 2 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B31) and IAT sensor 2, then go to step 22 .
20. Turn the ignition switch to LOCK (0).
21. Replace IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0098 indicated? YES -Check for poor connections or loose terminals at IAT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0098 indicated? YES -Check for poor connections or loose terminals at IAT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0101: MAF Sensor Circuit Range/Performance Problem

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

1. Check for poor connections or damage to these parts: PCV hose Air cleaner Purge (PCS) line Brake booster Brake booster hose Fuel pressure regulator (vacuum hose line) Turbocharger Charge air cooler Air bypass outlet pipe Intake manifold Intake air duct (charge air cooler inlet hose) Intake air duct (turbocharger outlet pipe) Intake air duct (turbocharger inlet tube and pipe) Intake air duct (charge air cooler outlet tube) Turbocharger bypass control solenoid valve Are the parts OK? YES -Go to step 2. NO -Repair or replace the damaged parts, then go to step 14 .
2. Check for damage or incorrectly installed air duct in the air cleaner. Is it OK? YES -Go to step 3. NO -Reconnect or replace the air duct in the air cleaner, then go to step 14 .
3. Check for a dirty air cleaner element. Is it dirty? YES -Replace the air cleaner element (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ), then go to step 14 . NO -Go to step 4.
4. Turn the ignition switch to ON (II).
5. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0.2 g/s, or 0.5 V indicated? YES -Go to step 6. NO -Go to step 12 .
6. Start the engine.
7. Vary the engine speed between 2, 000-3, 000 RPM.
8. Check the MAF SENSOR in the DATA LIST with the HDS. Does the reading change? YES -Go to step 9. NO -Go to step 12 .
9. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
10. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAF SENSOR
11. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 12. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 10 and recheck.
12. Turn the ignition switch to LOCK (0).
13. Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED MAP SENSOR MAF SENSOR
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0101 indicated? YES -Check for poor connections or loose terminals at the MAF sensor and the PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P0101 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 18 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAF sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 17 .

DTC P0102: MAF Sensor Circuit Low Voltage

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

Scheme 98

Scheme 99

Scheme 100

Scheme 101

1. Turn the ignition switch to ON (II), and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 0 g/s, or 0.1 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM.
3. Check the No. 3IG1 ACG (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 4. NO -Repair a short in the wire between the MAF sensor and the No. 3IG1 ACG (15 A) fuse. Also replace the No. 3 IG1 ACG (15 A) fuse, then go to step 20 .
4. Turn the ignition switch to LOCK (0).
5. Disconnect the MAF sensor/IAT sensor 1 5P connector.
6. Turn the ignition switch to ON (II).
7. Measure the voltage between MAF sensor/IAT sensor 1 5P connector terminal No. 5 and body ground. Is there battery voltage? YES -Go to step 8. NO -Repair an open in the wire between the No. 3 IG1 ACG (15 A) fuse and the MAF sensor/IAT sensor 1, then go to step 20 .
8. Turn the ignition switch to LOCK (0).
9. Measure the resistance between MAF sensor/IAT sensor 1 5P connector terminal No. 3 and body ground. Is there 190-210 kohms? YES -Go to step 14 . NO -Go to step 10.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector B (44P).
12. Check for continuity between PCM connector terminal B30 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B30) and the MAF sensor/IAT sensor 1, then go to step 21 . NO -Go to step 13.
13. Check for continuity between PCM connector terminal B30 and MAF sensor/IAT sensor 1 5P connector terminal No. 3. Is there continuity? YES -Go to step 26 . NO -Repair an open in the wire between the PCM (B30) and the MAF sensor/IAT sensor 1, then go to step 21 .
14. Substitute a known-good MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Clear the DTC with the HDS.
18. Start the engine. Hold the engine speed at 2, 000 RPM without load (in P or N).
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0102 indicated? YES -Reinstall the original MAF sensor/IAT sensor 1, then go to step 27 . NO -Replace the original MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 20.
20. Turn the ignition switch to LOCK (0).
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. 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 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
26. Reconnect all connectors.
27. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
28. 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 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0103: MAF Sensor Circuit High Voltage

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

Scheme 102

Scheme 103

1. Turn the ignition switch to ON (II), and wait 2 seconds.
2. Check the MAF SENSOR in the DATA LIST with the HDS. Is about 202 g/s, or 4.89 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Jump the SCS line with the HDS.
5. Disconnect the MAF sensor/IAT sensor 1 5P connector.
6. Disconnect PCM connector B (44P).
7. Check for continuity between PCM connector terminal B32 and MAF sensor/IAT sensor 1 5P connector terminal No. 4. Is there continuity? YES -Go to step 8. NO -Repair an open in the wire between the PCM (B32) and the MAF sensor/IAT sensor 1, then go to step 15 .
8. Reconnect PCM connector B (44P).
9. Connect MAF sensor/IAT sensor 1 5P connector terminals No. 3 and No. 4 with a jumper wire.
10. Turn the ignition switch to ON (II).
11. Clear the DTC with the HDS.
12. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Go to step 20 . NO -Go to step 13.
13. Turn the ignition switch to LOCK (0).
14. Replace the MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
20. Turn the ignition switch to LOCK (0).
21. Reconnect all connectors.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0103 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0107: MAP Sensor Circuit Low Voltage

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

Scheme 104

Scheme 105

Scheme 106

1. Turn the ignition switch to ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 inHg, 26 mmHg), or 0.23 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the MAP sensor 3P connector.
5. Turn the ignition switch to ON (II).
6. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 3 kPa (1.0 inHg, 26 mmHg), or 0.23 V or less indicated? YES -Go to step 12 . NO -Go to step 7.
7. Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 16 . NO -Go to step 8.
8. Turn the ignition switch to LOCK (0).
9. Jump the SCS line with the HDS.
10. Disconnect PCM connector C (44P).
11. Check for continuity between PCM connector terminal C13 and MAP sensor 3P connector terminal No. 1. Is there continuity? YES -Go to step 23 . NO -Repair an open in the wire between the PCM (C13) and the MAP sensor, then go to step 18 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector C (44P).
15. Check for continuity between MAP sensor 3P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C11) and the MAP sensor, then go to step 18 . NO -Go to step 23 .
16. Turn the ignition switch to LOCK (0).
17. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0107 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0108: MAP Sensor Circuit High Voltage

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

Scheme 107

Scheme 108

Scheme 109

Scheme 110

1. Turn the ignition switch to ON (II).
2. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 inHg, 1, 197 mmHg), or 4.49 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the MAP sensor 3P connector.
5. Connect MAP sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
6. Turn the ignition switch to ON (II).
7. Check the MAP SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.1 inHg, 1, 197 mmHg), or 4.49 V or more indicated? YES -Go to step 8. NO -Go to step 18 .
8. Remove the jumper wire from the MAP sensor 3P connector.
9. Measure the voltage between MAP sensor 3P connector terminals No. 1 and No. 3. Is there about 5 V? YES -Go to step 14 . NO -Go to step 10.
10. Turn the ignition switch to LOCK (0).
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector C (44P).
13. Check for continuity between PCM connector terminal C14 and MAP sensor 3P connector terminal No. 3. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (C14) and the MAP sensor, then go to step 20 .
14. Turn the ignition switch to LOCK (0).
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector C (44P).
17. Check for continuity between PCM connector terminal C11 and MAP sensor 3P connector terminal No. 2. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (C11) and the MAP sensor, then go to step 20 .
18. Turn the ignition switch to LOCK (0).
19. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
20. Reconnect all connectors.
21. Turn the ignition switch to ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0108 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0112: IAT 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 111

1. Turn the ignition switch to ON (II).
2. Check IAT 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 MAF sensor/IAT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the MAF sensor/IAT sensor 1 5P connector.
5. Turn the ignition switch to ON (II).
6. Check IAT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F(180°C) or more, or 0.08 V or less indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector C (44P).
10. Check for continuity between MAF sensor/IAT sensor 1 5P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between MAF sensor/IAT sensor 1 and the PCM (C28), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0).
12. Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0112 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0113: IAT 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 112

Scheme 113

Scheme 114

Scheme 115

1. Turn the ignition switch to ON (II).
2. Check IAT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F(-40°C) or less, or 4.90 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 MAF sensor/IAT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the MAF sensor/IAT sensor 1 5P connector.
5. Connect MAF sensor/IAT sensor 1 5P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II).
7. Check IAT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F(-40°C) or less, or 4.90 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from the MAF sensor/IAT sensor 1 5P connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between MAF sensor/IAT sensor 1 5P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check for continuity between PCM connector terminal B33 and MAF sensor/IAT sensor 1 5P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B33) and MAF sensor/IAT sensor 1, then go to step 22 .
16. Turn the ignition switch to LOCK (0).
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector C (44P).
19. Check for continuity between PCM connector terminal C28 and MAF sensor/IAT sensor 1 5P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (C28) and MAF sensor/IAT sensor 1, then go to step 22 .
20. Turn the ignition switch to LOCK (0).
21. Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0113 indicated? YES -Check for poor connections or loose terminals at the MAF sensor/IAT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0116: ECT Sensor 1 Circuit Range/Performance Problem

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

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 176°F (80°C) or more, or 0.78 V or less indicated? YES -Go to step 6 . NO -Go to step 3.
3. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
4. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F(10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11 .
6. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.
7. Turn the ignition switch to LOCK (0).
8. Open the hood, and let the engine cool for 3 hours.
9. Turn the ignition switch to ON (II).
10. Check ECT SENSOR 1 in the DATA LIST with the HDS. Does ECT SENSOR 1 change 18°F (10°C) or more? YES -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM. NO -Go to step 11.
11. Turn the ignition switch to LOCK (0).
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Turn the ignition switch to ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0117: ECT Sensor 1 Circuit Low Voltage

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

Scheme 116

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F(180°C) or more, or 0.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ECT sensor 1 2P connector.
5. Turn the ignition switch to ON (II).
6. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 356°F(180°C) or more, or 0.08 V or less indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector B (44P).
10. Check for continuity between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between ECT sensor 1 and the PCM (B23), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0).
12. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0117 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0118: ECT Sensor 1 Circuit High Voltage

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

Scheme 117

Scheme 118

Scheme 119

Scheme 120

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F(-40°C) or less, or 4.90 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ECT sensor 1 2P connector.
5. Connect ECT sensor 1 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II).
7. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about -40°F(-40°C) or less, or 4.90 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from the ECT sensor 1 2P connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between ECT sensor 1 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check for continuity between PCM connector terminal B33 and ECT sensor 1 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B33)and ECT sensor 1, then go to step 22 .
16. Turn the ignition switch to LOCK (0).
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector B (44P).
19. Check for continuity between PCM connector terminal B23 and ECT sensor 1 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B23) and ECT sensor 1, then go to step 22 .
20. Turn the ignition switch to LOCK (0).
21. Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0118 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0125: ECT Sensor 1 Malfunction/Slow Response

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

1. Start the engine, and let it idle for 5 minutes or more.
2. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 0°F(-18°C) or less indicated? YES -Check for poor connections or loose terminals at ECT SENSOR 1, ECT SENSOR 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 10 . NO -Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Allow the engine to cool to 104°F (40°C) or less.
5. Make sure the temperature difference of ECT SENSOR 1 and ECT SENSOR 2 is between about 50°F (10°C) in the DATA LIST with the HDS.
6. Start the engine, and let it idle until ECT sensor 1 goes up about 158°F (70°C). Does ECT SENSOR 2 also show about 158°F (70°C)? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
7. Check the thermostat (see «FAN MOTOR TEST»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ). Is the thermostat OK? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If they are OK, replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 8. NO -Replace the thermostat (see «THERMOSTAT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ), then go to step 8.
8. Turn the ignition switch to ON (II).
9. Reset the PCM with the HDS.
10. Turn the ignition switch to LOCK (0).
11. Allow the engine to cool 104°F (40°C) or less.
12. Check the temperature difference of ECT SENSOR 1 and ECT SENSOR 2 is between about 50°F (10°C) in the DATA LIST with the HDS.
13. Start the engine, and let it idle until ECT sensor 1 goes up about 158°F (70°C). Does ECT SENSOR 2 also show about 158°F (70°C)? YES -Go to step 1 and recheck. NO -Troubleshooting is complete.

DTC P0128: Cooling System Malfunction

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Make sure the A/C switch is off.
4. Check the FAN CTRL in the DATA LIST with the HDS. Is it OFF? YES -Go to step 5. NO -Wait until the FAN CTRL is off, then go to step 5.
5. Check the radiator fan operation. Does the radiator fan keep running? YES -Check the radiator fan circuit (see «RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/cooling-fan/#fan-controls) ), and the radiator fan relay (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). If the circuit and the relay are OK, go to step 19 . NO -Go to step 6.
6. Let the engine cool until the coolant temperature is 104°F(40°C) or less.
7. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.
8. Start the engine, and let it idle.
9. Let the engine idle until ECT SENSOR 1 goes up 41°F (23°C) or more from the recorded temperature.
10. Check ECT SENSOR 2 in the DATA LIST with the HDS.
11. Compare the recorded value of ECT SENSOR 2 and the present value of ECT SENSOR 2. Did temperature rise 14°F (8°C) or more? YES -Test the thermostat (see «FAN MOTOR TEST»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ), then go to step 12. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
12. Turn the ignition switch to ON (II).
13. Reset the PCM with the HDS.
14. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0128 indicated? YES -Check the cooling system, then go to step 19 . NO -Go to step 18.
18. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 17 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check the cooling system, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 14 .
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).
21. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
22. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0128 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 20 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 20 .

DTC P0133: 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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h).
5. Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0).
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch to ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed between 26-81 mph (41-130 km/h).
13. 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 PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P0133 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 «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

DTC P0134: 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.

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (in P or N) for at least 1 minute.
4. 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 PCM.
5. Turn the ignition switch to LOCK (0).
6. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
7. Turn the ignition switch to ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. 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 PCM, then go to step 1 . NO -Go to step 11.
11. Monitor the OBD STATUS for DTC P0134 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 10 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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 121

Scheme 122

Scheme 123

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

Scheme 129

Scheme 130

Scheme 131

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. 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 PCM.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 11 LAF (15 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Go to step 7. NO -Go to step 22 .
7. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
8. Test the PGM-FI subrelay (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Is the PGM-FI subrelay OK? YES -Go to step 9. NO -Replace the PGM-FI subrelay, then go to step 29 .
9. Disconnect the A/F sensor (Sensor 1) 4P connector.
10. At the sensor side, measure the resistance between A/F sensor (Sensor 1) 4P connector terminals No. 3 and No. 4. Is there 2.0-2.7 ohms at room temperature (about 68°F, 20°C)? YES -Go to step 11. NO -Go to step 27 .
11. 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. Is there continuity? YES -Go to step 27 . NO -Go to step 12.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
15. Check for continuity between PCM connector terminal C9 and body ground. Is there continuity? YES -Go to step 16. NO -Repair an open in the wire between the PCM (C9) and the A/F sensor (Sensor 1), then go to step 28 .
16. Remove the jumper wire from the A/F sensor (Sensor 1).
17. Check for continuity between PCM connector terminal C9 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C9) and the A/F sensor (Sensor 1), then go to step 28 . NO -Go to step 18.
18. Connect A/F sensor (Sensor 1) 4P connector terminal No. 3 to body ground with a jumper wire.
19. Check for continuity between PGM-FI subrelay 4P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 20. NO -Repair an open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step 28 .
20. Disconnect PCM connector A (44P).
21. Check for continuity between PCM connector terminal A21 and PGM-FI subrelay 4P connector terminal Is there continuity? YES -Go to step 34 . NO -Repair an open in the wire between the PCM (A21) and the PGM-FI subrelay, then go to step 28 .
22. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
23. Disconnect the A/F sensor (Sensor 1) 4P connector.
24. Disconnect the EVAP canister purge valve 2P connector.
25. Disconnect the EVAP canister vent shut valve 2P connector.
26. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and body ground. Is there continuity? YES -Repair a short in the wire between the PGM-FI subrelay, the EVAP canister purge valve, the EVAP canister vent shut valve, and the A/F sensor (Sensor 1). Also replace the No. 11 LAF (15 A) fuse, then go to step 28 . NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ), then go to step 28 .
27. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
28. Reconnect all connectors.
29. Turn the ignition switch to ON (II).
30. Reset the PCM with the HDS.
31. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
32. 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 PCM, then go to step 1 . NO -Go to step 33.
33. Monitor the OBD STATUS for DTC P0135 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 31 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
34. Reconnect all connectors.
35. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
36. Start the engine, and let it idle.
37. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 36 . If the PCM was substituted, go to step 1 . NO -Go to step 38.
38. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 37 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 36 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0137: Secondary HO2S (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 132

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.29 V or less? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Turn the ignition switch to ON (II).
8. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 0.29 V or less? YES -Go to step 9. NO -Go to step 13 .
9. Turn the ignition switch to LOCK (0).
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector C (44P).
12. Check for continuity between secondary HO2S (Sensor 2) 4P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C27) and the secondary HO2S (Sensor 2), then go to step 15 . NO -Go to step 23 .
13. Turn the ignition switch to LOCK (0).
14. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
20. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Engine speed between 1, 500-3, 000 RPM Maintain a steady speed for 1 minute or more
21. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 22.
22. Monitor the OBD STATUS for DTC P0137 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 21 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 19 .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Engine speed between 1, 500-3, 000 RPM Maintain a steady speed for 1 minute or more
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0137 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . NO -Go to step 28.
28. Monitor the OBD STATUS for DTC P0137 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 27 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 25 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 25 .

DTC P0138: Secondary HO2S (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 133

Scheme 134

Scheme 135

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 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 the secondary HO2S (Sensor 2) and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the secondary HO2S (Sensor 2) 4P connector.
7. Connect secondary HO2S (Sensor 2) 4P connector terminals No. 1 and No. 2 with a jumper wire.
8. Turn the ignition switch to ON (II).
9. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES -Go to step 10. NO -Go to step 19 .
10. Turn the ignition switch to LOCK (0).
11. Remove the jumper wire from the secondary HO2S (Sensor 2) 4P connector.
12. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 1 to body ground with a jumper wire.
13. Turn the ignition switch to ON (II).
14. Check the HO2S S2 in the DATA LIST with the HDS. Does the voltage stay at 1.25 V or more? YES -Go to step 15. NO -Repair an open in the wire between the PCM (B33) and the secondary HO2S (Sensor 2), then go to step 21 .
15. Turn the ignition switch to LOCK (0).
16. Jump the SCS line with the HDS.
17. Disconnect PCM connector C (44P).
18. Check for continuity between PCM connector terminal C27 and body ground. Is there continuity? YES -Go to step 29 . NO -Repair an open in the wire between the PCM (C27) and the secondary HO2S (Sensor 2), then go to step 21 .
19. Turn the ignition switch to LOCK (0).
20. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
21. Reconnect all connectors.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
26. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Engine speed between 1, 500-3, 000 RPM Maintain a steady speed for 1 minute or more
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 28.
28. Monitor the OBD STATUS for DTC P0138 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 27 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 25 .
29. Reconnect all connectors.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
31. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on, then continue idling.
32. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Engine speed between 1, 500-3, 000 RPM Maintain a steady speed for 1 minute or more
33. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0138 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . NO -Go to step 34.
34. Monitor the OBD STATUS for DTC P0138 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 33 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 31 .

DTC P0139: Secondary HO2S (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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Drive at a steady speed at 30 mph (48 km/h) or more for 20 seconds.
5. Monitor the OBD STATUS for DTC P0139 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0).
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch to ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Drive at a steady speed at 30 mph (48 km/h) or more for 20 seconds
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0139 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P0139 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 «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

DTC P0141: Secondary HO2S (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 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

Scheme 142

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. 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 the secondary HO2S (Sensor 2) and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 3IG1 ACG (15 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 7. NO -Repair a short in the wire between the No. 3 IG1 ACG (15 A) fuse and the secondary HO2S (Sensor 2), the alternator, the ELD, the CMP sensor A, the turbocharger wastegate control solenoid valve, the turbocharger boost control solenoid valve, and the turbocharger bypass control solenoid valve. Also replace the No. 3 IG1 ACG (15 A) fuse, then go to step 23 .
7. Disconnect the secondary HO2S (Sensor 2) 4P connector.
8. At the sensor side, measure the resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there 5.4-7.3 ohms at room temperature (about 68°F, 20°C)? YES -Go to step 9. NO -Go to step 22 .
9. At the sensor side, check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4 individually. Is there continuity? YES -Go to step 22 . NO -Go to step 10.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4. Is there battery voltage? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector B (44P).
15. Check for continuity between PCM connector terminal B4 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (B4) and the secondary HO2S (Sensor 2), then go to step 23 . NO -Go to step 29 .
16. Measure the voltage between secondary HO2S (Sensor 2) 4P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 17. NO -Repair an open in the wire between the secondary HO2S (Sensor 2) and the No. 3 IG1 ACG (15 A) fuse, then go to step 23 .
17. Turn the ignition switch to LOCK (0).
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector B (44P).
20. Connect secondary HO2S (Sensor 2) 4P connector terminal No. 4 to body ground with a jumper wire.
21. Check for continuity between PCM connector terminal B4 and body ground. Is there continuity? YES -Go to step 29 . NO -Repair an open in the wire between the PCM (B4) and the secondary HO2S (Sensor 2), then go to step 23 .
22. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Reset the PCM with the HDS.
26. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 28.
28. Monitor the OBD STATUS for DTC P0141 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 27 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
29. Reconnect all connectors.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
31. Start the engine, and let it idle.
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0141 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . NO -Go to step 33.
33. Monitor the OBD STATUS for DTC P0141 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 32 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 31 . If the PCM was substituted, go to step 1 . If the HDS indicates 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 indicated 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, P2A00: A/F sensor (Sensor 1) P0135: A/F sensor (Sensor 1) heater P0139: Secondary HO2S (Sensor 2) P0141: Secondary HO2S (Sensor 2) heater P2646, P2647, P2648, P2649: VTEC system

1. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-test) ). Is the fuel pressure OK? YES -Go to step 2. NO - If the pressure is too high, replace the fuel pressure regulator (see «FUEL PRESSURE REGULATOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system) ), then go to step 5 . 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/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system) ), then go to step 5 .
2. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
3. Check for these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in P or N All electrical loads off
4. 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 engine speed steady, check the MAF SENSOR in the DATA LIST with the HDS. Is about 8.6-10.5 g/s indicated? YES -Replace the injectors (see «INJECTOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 5. NO -Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 5.
5. Turn the ignition switch to ON (II).
6. Reset the PCM with the HDS.
7. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
8. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
9. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Drive at a steady speed between 15-75 mph (20-120 km/h) NOTE: DTC P0171 and/or P0172 may take up to 80 minutes of test driving to set. Using the HDS, monitor the air fuel feed back average (AF FB AVE). If the AF FB AVE stays within 0.80-1.25, there is no problem at this time.
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0171 or P0172 indicated? YES -Go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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

Special Tools Required

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

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If the misfire is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL comes on, and DTC P0300 (and some of the combination of P0301 through P0304) are stored. If the misfire is frequent enough to damage the catalyst, the MIL will flash whenever the misfire occurs, and DTC P0300 (and some of the combination of P0301 through P0304) are stored. When the misfire stops, the MIL stays 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 (Because parts can sometimes fail without setting DTCs, you should also do a physical inspection of the systems listed below.): P0101, P0102, P0103: MAF sensor P0107, P0108, P1128, P1129: MAP sensor P0171, P0172: Fuel system P0365, P0369: CMP sensor B P0506, P0507: Idle control system P2646, P2647, P2648, P2649: VTEC system

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (in P or N).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, wait for several minutes, then recheck.
5. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, 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.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED Vehicle speed REL TP SENSOR CLV (calculated load value) APP SENSOR
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 and recheck.
8. Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, 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.
9. Turn the ignition switch to LOCK (0).
10. Check the fuel quality. Is the quality good? YES -Go to step 11. NO -Drain the tank and fill it with a known-good fuel, then go to step 19 .
11. Remove and inspect the spark plugs (see «SPARK PLUG INSPECTION»(/acura/rdx/i-2009-2012/remont/ignition-system/#ignition-system) ). If the spark plugs are fouled or worn, replace them.
12. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED Vehicle speed REL TP SENSOR CLV (calculated load value) APP SENSOR
13. 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 19 .
14. Check the fuel pressure (see «FUEL PRESSURE TEST»(/acura/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system__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/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system) ), then go to step 19 . If the fuel 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/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system) ), then go to step 19 .
15. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
16. Check under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in P or N All electrical loads off
17. Monitor the ENGINE SPEED in the DATA LIST with the HDS. Raise and hold the engine speed steady at 2, 500±100 RPM. While holding the engine speed steady, check the MAF SENSOR in the DATA LIST with the HDS. Is about 8.6-10.5 g/s indicated? YES -Go to step 18. NO -Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19 .
18. Perform the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Does the engine pass the VTEC rocker arm test? YES -Replace the injectors (see «INJECTOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19. NO -Repair the VTEC system, and then go to step 19.
19. Turn the ignition switch to ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
23. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED Vehicle speed REL TP SENSOR CLV (calculated load value) APP SENSOR
24. 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 coil, the injector, and the 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/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-p0301-no-1-cylinder-misfire) ). NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 24 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, go to step 1 and recheck. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 23 .

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 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

Scheme 148

Scheme 149

Scheme 150

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (in P or N).
4. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates EXECUTING, let the engine idle until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, wait for several minutes, and recheck.
5. 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.
6. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
7. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 9 . NO -If the HDS indicates PASSED, go to step 8. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, go to step 6 and recheck.
8. 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 loose wires or poor connections in the fuel system circuit.
9. Turn the ignition switch to LOCK (0).
10. Remove the charge air cooler (see «REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ), and the injector cover, then reinstall the charge air cooler.
11. Start the engine, and listen for a clicking sound at the injector of the problem cylinder. Does the injector click? YES -Go to step 12. NO -Go to step 22 .
12. Turn the ignition switch to LOCK (0).
13. Exchange the ignition coil from the problem cylinder with one from another cylinder.
14. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
15. 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 16. NO -Intermittent misfire due to poor contact at the ignition coil connector (no misfire at this time). Check for poor connections or loose terminals at the ignition coil.
16. 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/rdx/i-2009-2012/remont/ignition-system/#ignition-system) ), then go to step 56 . NO -Go to step 17.
17. Turn the ignition switch to LOCK (0).
18. Exchange the spark plug from the problem cylinder with one from another cylinder.
19. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
20. 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 21. NO -Intermittent misfire due to spark plug fouling (no misfire at this time).
21. 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 56 . NO -Go to step 22.
22. Turn the ignition switch to LOCK (0).
23. Exchange the injector from the problem cylinder with one from the another cylinder.
24. Start the engine, and let it idle for 2 minutes.
25. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
26. 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 27. NO -Intermittent misfire due to poor contact at the injector connector (no misfire at this time). Check for poor connections or loose terminals at the injector.
27. 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/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 56 . NO -Go to step 28.
28. Turn the ignition switch to LOCK (0).
29. Disconnect the ignition coil 3P connector from the problem cylinder.
30. Turn the ignition switch to ON (II).
31. Measure the voltage between ignition coil 3P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 32. NO -Repair an open in the wire between the ignition coil and the ignition coil relay, then go to step 56 .
32. Turn the ignition switch to LOCK (0).
33. Check for continuity between ignition coil 3P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 34. NO -Repair an open in the wire between the ignition coil and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 56 .
34. Jump the SCS line with the HDS.
35. Disconnect PCM connector C (44P).
36. Check for continuity between body ground and the appropriate PCM connector terminal of the problem cylinder (see table). PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 C15 YEL/GRN No. 2 P0302 C16 BLU/RED No. 3 P0303 C17 WHT/BLU No. 4 P0304 C18 BRN Is there continuity? YES -Repair a short in the wire between the PCM and the ignition coil, then go to step 56 . NO -Go to step 37.
37. Check for continuity between appropriate ignition coil 3P connector terminal No. 1 and the appropriate PCM connector terminal of the problem cylinder (see table). PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 C15 YEL/GRN No. 2 P0302 C16 BLU/RED No. 3 P0303 C17 WHT/BLU No. 4 P0304 C18 BRN Is there continuity? YES -Go to step 38. NO -Repair an open in the wire between the PCM and the ignition coil, then go to step 56 .
38. Reconnect all connectors.
39. Do an engine compression and a cylinder leakdown test (see «ENGINE COMPRESSION INSPECTION»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head__engine-compression-inspection) ). Did the engine pass both tests? YES -Go to step 40. NO -Repair the engine, then go to step 56 .
40. Do the VTEC rocker arm test (see «VTEC ROCKER ARM TEST»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head__vtec-rocker-arm-test) ). Did the engine pass the test? YES -Go to step 41. NO -Replace the VTEC rocker arm (see «ROCKER ARM ASSEMBLY REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ), then go to step 56 .
41. Turn the ignition switch to LOCK (0).
42. Disconnect the injector 2P connector from the problem cylinder.
43. Turn the ignition switch to ON (II).
44. Measure the voltage between injector 2P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 45. NO -Repair an open in the wire between the injector and PGM-FI main relay 1, then go to step 56 .
45. Turn the ignition switch to LOCK (0).
46. Jump the SCS line with the HDS.
47. Disconnect PCM connector C (44P).
48. Check for continuity between body ground and the appropriate PCM connector terminal of the problem cylinder (see table). PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 C5 BRN No. 2 P0302 C6 RED No. 3 P0303 C7 BLU No. 4 P0304 C8 YEL Is there continuity? YES -Repair a short in the wire between the PCM and the injector, then go to step 56 . NO -Go to step 49.
49. Check for continuity between the appropriate PCM connector terminal of the problem cylinder and appropriate injector 2P connector terminal No. 2 (see table). PROBLEM CYLINDER DTC PCM TERMINAL WIRE COLOR No. 1 P0301 C5 BRN No. 2 P0302 C6 RED No. 3 P0303 C7 BLU No. 4 P0304 C8 YEL Is there continuity? YES -Go to step 50. NO -Repair an open in the wire between the PCM and the injector, then go to step 56 .
50. At the injector side, measure the resistance between injector 2P connector terminals No. 1 and No. 2. Is there 10-13 ohms? YES -Go to step 51. NO -Replace the injector (see «INJECTOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 57 .
51. Substitute a known-good injector into the problem cylinder.
52. Reconnect all connectors.
53. Start the engine, and let it idle for 2 minutes.
54. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value). APP SENSOR GEAR POSITION
55. 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 65 . NO -Replace the original injector (see «INJECTOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 56.
56. Turn the ignition switch to LOCK (0).
57. Reconnect all connectors.
58. Turn the ignition switch to ON (II).
59. Reset the PCM with the HDS.
60. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
61. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
62. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
63. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 62 . If the PCM was substituted, go to step 1 . NO -Go to step 64.
64. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 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 63 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, go to step 62 .
65. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
66. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED REL TP SENSOR CLV (calculated load value) APP SENSOR GEAR POSITION
67. 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 coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 66 . If the PCM was substituted, go to step 1 . NO -Go to step 68.
68. Monitor the OBD STATUS for DTC P0301, P0302, P0303, or P0304 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 67 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 66 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION or NOT COMPLETED, go to step 66 .

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 151

Scheme 152

Scheme 153

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the knock sensor and the PCM.
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect the knock sensor 1P connector (see «KNOCK SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
9. Disconnect PCM connector C (44P).
10. Check for continuity between PCM connector terminal C42 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C42) and the knock sensor, then go to step 14 . NO -Go to step 11.
11. Connect the knock sensor 1P connector terminal to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal C42 and body ground. Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the PCM (C42) and the knock sensor, then go to step 14 .
13. Replace the knock sensor (see «KNOCK SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
14. Reconnect all connectors.
15. Turn the ignition switch to ON (II).
16. Reset the PCM with the HDS.
17. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
18. Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Go to step 21 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 18 .
21. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
22. Hold the engine speed between 3, 000-4, 000 RPM for at least 10 seconds.
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0325 indicated? YES -Check for poor connections or loose terminals at the knock sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P0325 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the knock sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . If the HDS 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 154

Scheme 155

Scheme 156

Scheme 157

Scheme 158

Scheme 159

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the CKP sensor 3P connector.
7. Turn the ignition switch to ON (II).
8. Measure the voltage between CKP sensor 3P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 9. NO -Repair an open in the wire between the CKP sensor and PGM-FI main relay 1, then go to step 19 .
9. Measure the voltage between CKP sensor 3P connector terminal No. 2 and body ground. Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
10. Measure the voltage between CKP sensor 3P connector terminals No. 1 and No. 3. Is there battery voltage? YES -Go to step 17 . NO -Repair an open in the wire between the CKP sensor and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 19 .
11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Check for continuity between PCM connector terminal C32 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C32) and the CKP sensor, then go to step 19 . NO -Go to step 15.
15. Connect CKP sensor 3P connector terminal No. 2 to body ground with a jumper wire.
16. Check for continuity between PCM connector terminal C32 and body ground. Is there continuity? YES -Go to step 25 . NO -Repair an open in the wire between the PCM (C32) and the CKP sensor, then go to step 19 .
17. Turn the ignition switch to LOCK (0).
18. Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II).
21. Reset the PCM with the HDS.
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
23. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 indicated? YES -Check for poor connections or loose terminals at the CKP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0335 indicated? YES -Check for poor connections or loose terminals at the CKP sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0339: CKP Sensor Circuit Intermittent Interruption

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle for 10 seconds.
4. Monitor the OBD STATUS for DTC P0339 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
6. Monitor the OBD STATUS for DTC P0339 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the CKP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 5 and recheck.
7. Check for poor or loose connections and terminals at these locations: CKP sensor PCM Engine ground Body ground Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connectors or terminals, then go to step 11 .
8. Remove the cam chain case (see «CAM CHAIN REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head__cam-chain-removal) ), then check the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ) for damage or metal debris. Is the pulse plate damaged? YES -Clean or replace the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ), then go to step 11 . NO -Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
11. Turn the ignition switch to ON (II).
12. Reset the PCM with the HDS.
13. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
14. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
15. Start the engine, and let it idle for 10 seconds.
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0339 indicated? YES -Check for poor connections or loose terminals at the CKP sensor and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0365: CMP Sensor B 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 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor B and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Disconnect the CMP sensor B 3P connector.
7. Turn the ignition switch to ON (II).
8. Measure the voltage between CMP sensor B 3P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 9. NO -Repair an open in the wire between CMP sensor B and PGM-FI main relay 1, then go to step 18 .
9. Measure the voltage between CMP sensor B 3P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 10. NO -Go to step 11 .
10. Measure the voltage between CMP sensor 3P connector terminals No. 2 and No. 3. Is there battery voltage? YES -Go to step 16 . NO -Repair an open in the wire between CMP sensor B and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 18 .
11. Turn the ignition switch to LOCK (0).
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector C (44P).
14. Check for continuity between PCM connector terminal C31 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C31) and CMP sensor B, then go to step 18 . NO -Go to step 15.
15. Check for continuity between PCM connector terminal C31 and CMP sensor B 3P connector terminal No. 1. Is there continuity? YES -Go to step 23 . NO -Repair an open in the wire between the PCM (C31) and CMP sensor B, then go to step 18 .
16. Turn the ignition switch to LOCK (0).
17. Replace CMP sensor B (see «CMP SENSOR B REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0365 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle for 10 seconds.
4. Monitor the OBD STATUS for DTC P0369 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7 . NO -If the HDS indicates PASSED, go to step 5. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
5. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: ENGINE SPEED VEHICLE SPEED
6. Monitor the OBD STATUS for DTC P0369 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at CMP sensor B and the PCM. If the HDS indicates NOT COMPLETED, go to step 5 and recheck.
7. Check for poor or loose connections and terminals at these locations: CMP sensor B PCM Engine ground Body ground Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or terminals, then go to step 11 .
8. Check for damage on the CMP pulse plate B (see «CMP PULSE PLATE B REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ). Is the pulse plate damaged? YES -Replace the CMP pulse plate B (see «CMP PULSE PLATE B REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ), then go to step 11 . NO -Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Replace CMP sensor B (see «CMP SENSOR B REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
11. Turn the ignition switch to ON (II).
12. Reset the PCM with the HDS.
13. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
14. Start the engine, and let it idle for 10 seconds.
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0369 indicated? YES -Check for poor connections or loose terminals at CMP sensor B and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P050A: Cold Start Idle Air Control System Performance Problem

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

1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050A indicated? YES -Go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -Go to step 3.
3. Check for blockage or incorrect installation of the air intake duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the air intake duct, then go to step 19 .
4. Check for damage at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ), then go to step 19 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ), then go to step 19 . NO -Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F(50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 10. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates EXECUTING, let the engine idle until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 and recheck.
10. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 11. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 19 .
11. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
12. 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 engine speed steady, check the MAF SENSOR in the DATA LIST with the HDS. Is about 8.6-10.5 g/s indicated? YES -Go to step 13. NO -Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19 .
13. Turn the ignition switch to LOCK (0).
14. Allow the engine to cool to ambient temperature.
15. Note the ambient temperature.
16. Turn the ignition switch to ON (II).
17. Note the value of the IAT SENSOR quickly in the DATA LIST with the HDS.
18. Compare the value of the IAT SENSOR and the ambient temperature. Does the value of the IAT SENSOR differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 19. NO -Check for dirt, carbon, or damage in the throttle bore. If there is dirt or carbon, clean the throttle body (see «THROTTLE BODY TEST»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-test) ), then go to step 19. If there is damage to the throttle bore, replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 19.
19. Turn the ignition switch to ON (II).
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
22. Let the engine cool until the value of ECT SENSOR 1 is 122°F(50°C) or less.
23. Start the engine, and let it idle for 10 seconds or more.
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P050A indicated? YES -Check for poor connections or loose terminals at the throttle body, MAF sensor/IAT sensor 1, and the PCM, then go to step 1 . NO -Go to step 25.
25. Monitor the OBD STATUS for DTC P050A in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 24 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the throttle body, MAF sensor/IAT sensor 1, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 22 .

DTC P050B: Cold Start Ignition Timing Control System Performance Problem

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

1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs other than P050B indicated? YES -Go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -Go to step 3.
3. Check for blockage or incorrect installation of the air intake duct. Is it OK? YES -Go to step 4. NO -Reconnect or repair the air intake duct, then go to step 21 .
4. Check for damage at the air cleaner housing. Is it OK? YES -Go to step 5. NO -Replace the air cleaner housing (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ), then go to step 21 .
5. Check for dirt or debris in the air cleaner element. Is it dirty? YES -Replace the air cleaner element or remove the debris (see «AIR CLEANER ELEMENT INSPECTION/REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ), then go to step 21 . NO -Go to step 6.
6. Let the engine cool until the value of ECT SENSOR 1 is 122°F(50°C) or less.
7. Clear the DTC with the HDS.
8. Start the engine, and let it idle for 10 seconds or more.
9. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 10. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 6 and recheck.
10. Check the ignition timing (see «IGNITION TIMING INSPECTION»(/acura/rdx/i-2009-2012/remont/ignition-system/#ignition-system) ). Is the ignition timing OK? YES -Go to step 12 . NO -Go to step 11.
11. Check for damage at the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ) and the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ). Is the CKP sensor and/or the CKP pulse plate damaged? YES -Replace the CKP sensor (see «CKP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ) and/or the CKP pulse plate (see «CKP PULSE PLATE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/mechanical/#cylinder-head) ), then go to step 22 . NO -Go to step 28 .
12. Do the ETCS TEST in the INSPECTION MENU with the HDS. Is the THROTTLE ACTUATOR CONTROL VALVE normal? YES -Go to step 13. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ), then go to step 21 .
13. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
14. 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 engine speed steady, check the MAF SENSOR in the DATA LIST with the HDS. Is about 8.6-10.5 g/s indicated? YES -Go to step 15. NO -Replace MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 21 .
15. Turn the ignition switch to LOCK (0).
16. Allow the sensors to cool to ambient temperature.
17. Note the ambient temperature.
18. Turn the ignition switch to ON (II).
19. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
20. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does either sensor differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 21. NO -Check and repair any problems with the following items, then go to step 21. Engine compression and cylinder leakdown VTEC system Engine oil A/C system Power steering
21. Turn the ignition switch to ON (II).
22. Reset the PCM with the HDS.
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. Let the engine cool until the value of ECT SENSOR 1 is 122°F (50°C) or less.
25. Start the engine, and let it idle for 10 seconds or more.
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P050B indicated? YES -Check for poor connections or loose terminals at the CKP sensor, the throttle body, MAF sensor/IAT sensor 1, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Go to step 27.
27. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 26 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, MAF sensor/IAT sensor 1, ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 24 .
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Let the engine cool until the value of ECT SENSOR 1 is 122°F(50°C) or less.
30. Start the engine, and let it idle for 10 seconds or more.
31. 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, MAF sensor/IAT sensor 1, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 29 . If the PCM was substituted, go to step 1 . NO -Go to step 32.
32. Monitor the OBD STATUS for DTC P050B in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 31 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the CKP sensor, the throttle body, MAF sensor/IAT sensor 1, ECT sensor 1, ECT sensor 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 29 . If the PCM was substituted, go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 29 .

DTC P0562: Charging System Low Voltage

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0562 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, and check the battery performance (see «BATTERY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ).
7. Turn the ignition switch to ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine.
11. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
12. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0562 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0563: PCM Power Source Circuit Unexpected Voltage

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

Scheme 165

Scheme 166

Scheme 167

Scheme 168

Scheme 169

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Wait 10 seconds.
5. Turn the ignition switch to ON (II).
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0563 indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM.
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Measure the voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES -Go to step 13 . NO -Go to step 11.
11. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
12. Check for continuity between PCM connector terminal A6 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A6) and PGM-FI main relay 1, then go to step 16 . NO -Go to step 15 .
13. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
14. Measure the voltage between PCM connector terminal A8 and body ground. Is there battery voltage? YES -Repair a short to power in the wire between the PCM (A8) and PGM-FI main relay 1, then go to step 16 . NO -Go to step 15.
15. Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 23 . NO -Replace PGM-FI main relay 1, then go to step 16.
16. Reconnect all connectors.
17. Turn the ignition switch to ON (II).
18. Reset the PCM with the HDS.
19. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
20. Turn the ignition switch to LOCK (0).
21. Wait 10 seconds.
22. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0563 Indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
23. Reconnect all connectors.
24. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0563 indicated? YES -Check for poor connections or loose terminals at PGM-FI main relay 1 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0602: PCM Programming Error

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

1. Do the PCM update procedure (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
2. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0602 indicated? YES -Replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -The update is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0606: 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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Turn the ignition switch to ON (II).
5. Wait 40 seconds.
6. 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.
7. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
8. Turn the ignition switch to LOCK (0).
9. Turn the ignition switch to ON (II).
10. Wait 40 seconds.
11. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0606 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 8 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs with the HDS. Is DTC P060A indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P060A indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0615: Starter Cut Relay STRLD Circuit Malfunction

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). If DTC P0705 and/or P0706 in the A/T system are stored at the same time as DTC P0615, troubleshoot DTC P0705 and/or P0706 first, then recheck for DTC P0615. If DTC P16BD and/or P16BE are stored at the same time as DTC P0615, troubleshoot DTC P16BD and/or P16BE first, then recheck for DTC P0615.

Scheme 170

Scheme 171

Scheme 172

Scheme 173

Scheme 174

Scheme 175

Scheme 176

Scheme 177

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Hold the ignition switch in START (III) for 1 second or more.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 (STR) and the PCM.
5. Try to start the engine. Does the engine start? YES -Go to step 6. NO -Go to step 13 .
6. Turn the ignition switch to LOCK (0).
7. Check the No. 23 STRLD (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 8. NO -Replace the fuse, then go to step 27 .
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
11. Connect starter cut relay 1 (STR) 4P connector terminal No. 2 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A13 and body ground. Is there continuity? YES -Go to step 31 . NO -Repair an open in the wire between the PCM (A13) and starter cut relay 1 (STR), then go to step 26 .
13. Turn the ignition switch to LOCK (0).
14. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
15. Remove starter cut relay 2 (A) from the under-dash fuse/relay box.
16. Connect starter cut relay 1 (STR) 4P connector terminal No. 4 to body ground with a jumper wire.
17. Check the STARTER CUT CONTROL RETURN in the DATA LIST with the HDS while the ignition switch is in START (III). Is OFF indicated? YES -Go to step 18. NO -Go to Step 22 .
18. Remove the jumper wire from starter cut relay 1 (STR) 4P connector.
19. Turn the ignition switch to LOCK(0).
20. Disconnect the transmission range switch 10P connector.
21. At the switch side, check for continuity between transmission range switch 10P connector terminals No. 1 and No. 6 with the shift lever in N, and then in P. Is there continuity in each shift lever position? YES -Repair an open in the wire between starter cut relay 1, starter cut relay 2 and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 26 . NO -Replace the transmission range switch (see «TRANSMISSION RANGE SWITCH TEST»(/acura/rdx/i-2009-2012/remont/automatic-trans/#automatic-transmission) ), then go to step 26 .
22. Turn the ignition switch to LOCK (0).
23. Jump the SCS line with the HDS.
24. Disconnect PCM connector A (44P).
25. Check for continuity between PCM connector terminal A12 and body ground with the jumper wire still connected. Is there continuity? YES -Go to step 31 . NO -Repair an open in the wire between the PCM (A12) and starter cut relay 1 (STR) or starter cut relay 2, then go to step 26.
26. Reconnect all connectors.
27. Turn the ignition switch to ON (II).
28. Reset the PCM with the HDS.
29. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
30. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals between starter cut relay 1 (STR) and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
31. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0615 indicated? YES -Check for poor connections or loose terminals between starter cut relay 1 (STR) and the PCM, then go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs with the HDS. Are any Pending or Confirmed DTCs indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P062F indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0630: VIN Not Programmed or Mismatch

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

1. Turn the ignition switch to ON (II).
2. Check the VIN with the HDS. Does the HDS show the vehicle's VIN? YES -Go to step 5 . NO -Go to step 3.
3. Input the VIN to the PCM with the HDS. Does the HDS show COMPLETE? YES -Go to step 5 . NO -Go to step 4.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P062F indicated? YES -Go to the DTC P062F troubleshooting (see «DTC P062F: PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-p062f-pcm-internal-control-module) ). NO -Go to step 9 .
5. Clear the DTC with the HDS.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II), and wait 5 seconds.
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0630 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
9. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0630 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle for 30 seconds.
4. Turn the ignition switch to LOCK (0).
5. Start the engine, then let it idle for 30 seconds.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II).
8. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0685 indicated? YES -Go to step 9. NO -Intermittent failure, the system is OK at this time.
9. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
10. Start the engine, then let it idle for 30 seconds.
11. Turn the ignition switch to LOCK (0).
12. Start the engine, then let it idle for 30 seconds.
13. Turn the ignition switch to LOCK (0).
14. Turn the ignition switch to ON (II).
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0685 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 10 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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 ).

1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs in the A/T SYSTEM menu with the HDS. Is DTC P0722 indicated? YES -Troubleshoot for DTC P0722 in the A/T system (see «DTC P0722: OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR (NO SIGNAL INPUT); DTC P0723: OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR (INTERMITTENT FAILURE)»(/acura/rdx/i-2009-2012/remont/automatic-trans/#automatic-transmission) ). NO -Go to step 3.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 176°F(80°C) Transmission in D Engine speed between 2, 000-4, 500 RPM Drive for several minutes, then decelerate (with the throttle fully closed) for 5 seconds or more
5. Check for Pending or Confirmed DTCs in the PGM-FI SYSTEM with the HDS. Is DTC P0720 indicated? YES -Go to step 6. NO -Go to step 7 .
6. Check for Pending or Confirmed DTCs in the A/T SYSTEM menu with the HDS. Is DTC P0722 indicated? YES -Troubleshoot for DTC P0722 in the A/T system (see «DTC P0722: OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR (NO SIGNAL INPUT); DTC P0723: OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR (INTERMITTENT FAILURE)»(/acura/rdx/i-2009-2012/remont/automatic-trans/#automatic-transmission) ). NO -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 4 . If the PCM was substituted, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step 1 .
7. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 4 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 4 .

DTC P1109: BARO Sensor Circuit Out of Range High

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

1. Turn the ignition switch to ON (II).
2. Reset the PCM with the HDS.
3. Start the engine.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time.
5. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1109 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 2 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1116: ECT Sensor 1 Circuit Range/Performance Problem

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

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 22 .
2. Turn the ignition switch to ON (II).
3. Check for Pending or Confirmed DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES -Go to step 12 . NO -Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 127°F (53°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Allow ECT sensor 1 to cool to ambient temperature.
8. Note the ambient temperature.
9. Turn the ignition switch to ON (II).
10. Note the value of ECT SENSOR 1 quickly in the DATA LIST with the HDS.
11. Compare the value of ECT SENSOR 1 and the ambient temperature. Does the value of ECT SENSOR 1 differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Intermittent failure, the system is OK at this time. Reinstall ECT sensor 1, and refill the cooling system (see «COOLANT CHECK»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ). Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
12. Start the engine, and let it idle for 10 minutes.
13. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 127°F(53°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 14.
14. Let the engine idle for 10 minutes.
15. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 124°F (51°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 16.
16. Turn the ignition switch to LOCK (0).
17. Allow the sensors to cool to ambient temperature.
18. Note the ambient temperature.
19. Turn the ignition switch to ON (II).
20. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
21. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensors differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 22. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1116 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1128: MAP Sensor Signal Lower Than Expected

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

1. Turn the ignition switch to ON (II).
2. Compare the value of the MAP SENSOR and the TURBOCHARGER BOOST SENSOR in the DATA LIST with the HDS. Does the value differ more than 26.7 kPa (7.9 inHg, 200 mmHg)? YES -Go to step 10 . NO -Go to step 3.
3. Note the value of MAP SENSOR in the DATA LIST with the HDS.
4. Start the engine, and let it idle.
5. Check the MAP SENSOR in the DATA LIST with the HDS. Does the MAP SENSOR change 0.67 kPa (0.2 inHg, 5 mmHg) or more? YES -Go to step 6. NO -Go to step 10 .
6. Clear the DTC with the HDS.
7. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
8. Test-drive under these conditions: Engine speed above 1, 750 RPM Transmission in D REL TP SENSOR above 22 deg Drive 5 seconds or more
9. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 10. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 7 and recheck.
10. Turn the ignition switch to LOCK(0).
11. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
12. Turn the ignition switch to ON (II).
13. Reset the PCM with the HDS.
14. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
15. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle for 10 seconds.
16. Test-drive under these conditions: Engine speed above 1, 750 RPM Transmission in D REL TP SENSOR above 22 deg Drive 5 seconds or more
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1128 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 18.
18. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 17 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 15 .

DTC P1129: MAP Sensor Signal Higher Than Expected

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

1. Check for vacuum or air leaks in these parts: PCV valve PCV hose EVAP canister purge valve Throttle body Air bypass outlet pipe Intake manifold Brake booster Brake booster hose Fuel pressure regulator Turbocharger Charge air cooler Intake air duct (turbocharger inlet tube and pipe) Intake air duct (turbocharger outlet pipe) Intake air duct (charge air cooler inlet hose) Intake air duct (charge air cooler outlet tube) Turbocharger bypass control solenoid valve Are there any vacuum or air leaks? YES -Repair or replace part(s) with vacuum or air leaks, then go to step 9 . NO -Go to step 2.
2. Turn the ignition switch to ON (II).
3. Compare the value of the MAP SENSOR and the TURBOCHARGER BOOST SENSOR in the DATA LIST with the HDS. Does the value differ more than 26.7 kPa (7.9 inHg, 200 mmHg)? YES -Go to step 11 . NO -Go to step 4.
4. Note the value of MAP SENSOR in the DATA LIST with the HDS.
5. Start the engine, and let it idle.
6. Check the MAP SENSOR in the DATA LIST with the HDS. Does the MAP SENSOR change 0.67 kpa (0.2 inHg, 5 mmHg) or more? YES -Go to step 7. NO -Go to step 11 .
7. Clear the DTC with the HDS.
8. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
9. Test-drive under these conditions: Engine speed above 1, 750 RPM Transmission in D REL TP SENSOR above 22 deg Drive 5 seconds or more
10. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the HDS Indicate FAILED? YES -Go to step 1 . NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the MAP sensor and the PCM. If the HDS indicates NOT COMPLETED, go to step 8 and recheck.
11. Turn the ignition switch to LOCK (0).
12. Replace the MAP sensor (see «MAP SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Turn the ignition switch to ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
17. Test-drive under these conditions: Engine speed above 1, 750 RPM Transmission in D REL TP SENSOR above 22 deg Drive 5 seconds or more
18. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1129 indicated? YES -Check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . NO -Go to step 19.
19. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 18 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the MAP sensor and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 16 .

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 178

Scheme 179

Scheme 180

Scheme 181

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and wait 1 minute.
4. 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 PCM.
5. Turn the ignition switch to LOCK (0).
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 4P connector.
8. Disconnect PCM connector C (44P).
9. Connect A/F sensor (Sensor 1) 4P connector terminals No. 1 and No. 2 with a jumper wire.
10. Check for continuity between PCM connector terminals C29 and C30. Is there continuity? YES -Go to step 14 . NO -Go to step 11.
11. Remove the jumper wire from the A/F sensor (Sensor 1) 4P connector.
12. Connect A/F sensor (Sensor 1) 4P connector terminal No. 1 to body ground with a jumper wire.
13. Check for continuity between PCM connector terminal C29 and body ground. Is there continuity? YES -Repair an open in the wire between the PCM (C30) and the A/F sensor (Sensor 1), then go to step 15 . NO -Repair an open in the wire between the PCM (C29) and the A/F sensor (Sensor 1), then go to step 15 .
14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. 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 PCM, then go to step 1 . If the connector and terminal fits are OK, go to step 21 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P1157 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
22. Start the engine, and let it idle.
23. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1157 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . NO -Go to step 24.
24. Monitor the OBD STATUS for DTC P1157 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 23 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . If the HDS 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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Monitor the OBD STATUS for DTC P1172 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 5. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
5. Turn the ignition switch to LOCK (0).
6. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
7. Turn the ignition switch to ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
11. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1172 indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . NO -Go to step 12.
12. Monitor the OBD STATUS for DTC P1172 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 11 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 10 .

DTC P1297: ELD Circuit Low Voltage

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

Scheme 182

1. Turn the ignition switch to ON (II).
2. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ELD 3P connector.
5. Turn the ignition switch to ON (II).
6. Check the ELD in the DATA LIST with the HDS. Is 72 A or more indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A23 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A23) and the ELD, then go to step 13 . NO -Go to step 20 .
11. Turn the ignition switch to LOCK (0).
12. Replace the ELD (see «ELD REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Start the engine, and let it idle.
18. Turn on the headlights.
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
20. Reconnect all connectors.
21. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
22. Start the engine, and let it idle.
23. Turn on the headlights.
24. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1297 indicated? YES -Check for poor connections or loose terminals at the ELD and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 22 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1298: ELD Circuit High Voltage

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

Scheme 183

Scheme 184

Scheme 185

1. Turn the ignition switch to ON (II).
2. Check the ELD in the DATA LIST with the HDS. Is 0.2 A or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the ELD and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ELD 3P connector.
5. Turn the ignition switch to ON (II).
6. Measure the voltage between ELD 3P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 7. NO -Check the No. 3 IG1 ACG (15 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the wire between the No. 3 IG1 ACG (15 A) fuse and the ELD, then go to step 13 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A23 and ELD 3P connector terminal No. 3. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A23) and the ELD, then go to step 13 .
11. Check for continuity between ELD 3P connector terminal No. 2 and body ground. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between the ELD and G202 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ), then go to step 13 .
12. Replace the ELD (see «ELD REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1298 indicated? YES -Go to step 18. NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
18. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
19. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1298 indicated? YES -Check for poor connections or loose terminals at the ELD and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P1549: Charging System High Voltage

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine.
4. Check under these conditions: A/C off Headlights off Rear window defogger off
5. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1549 indicated? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/charging-system/#charging-system) ), then go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box.
7. Turn the ignition switch to ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Start the engine.
11. Check under these conditions: A/C off Headlights off Rear window defogger off
12. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P1549 indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BB: Alternator B Terminal Circuit Low Voltage

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with HDS.
3. Start the engine.
4. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
5. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BB indicated? YES -Go to step 7. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, and check the battery performance (see «BATTERY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ).
7. Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box (+ B line). Are the connections and terminals OK? YES -Go to step 8. NO -Repair the connections or terminals, then go to step 9 .
8. Check for an open in the wire (+ B line) between the alternator and under-hood fuse/relay box. Is the harness OK? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/charging-system/#charging-system) ), then go to step 9. NO -Repair an open in the wire between the alternator and the under-hood fuse/relay box, then go to step 9.
9. Turn the ignition switch to ON (II).
10. Reset the PCM with the HDS.
11. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
12. Start the engine.
13. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
14. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
15. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BB indicated? YES -Check for poor connections or loose terminals at the alternator and the under-hood fuse/relay box, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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

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

Scheme 186

Scheme 187

Scheme 188

1. Check for poor connections or loose terminals at the alternator 4P connector. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 18 .
2. Check the alternator mounting surface for corrosion. Is the mounting surface corroded? YES -Remove the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/charging-system/#charging-system) ). Clean all mounting surfaces, reinstall the alternator, then go to step 18 . NO -Go to step 3.
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Start the engine.
6. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
7. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
8. 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.
9. Turn the ignition switch to LOCK (0).
10. Disconnect the alternator 4P connector.
11. Turn the ignition switch to ON (II).
12. Measure the voltage between alternator 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 13. NO -Repair an open in the wire between the alternator (IG1 line) and the No. 3 IG1 ACG (15 A) fuse in the under-dash fuse/relay box, then go to step 18 .
13. Measure the voltage between alternator 4P connector terminal No. 4 and body ground. Is there about 5 V? YES -Replace the alternator (see «ALTERNATOR REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/charging-system/#charging-system) ), then go to step 18 . NO -Go to step 14.
14. Turn the ignition switch to LOCK (0).
15. Jump the SCS line with the HDS.
16. Disconnect PCM connector B (44P).
17. Check for continuity between PCM connector terminal B43 and alternator 4P connector terminal No. 4. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (B43) and the alternator, then go to step 18.
18. Turn the ignition switch to LOCK (0).
19. Reconnect all connectors.
20. Turn the ignition switch to ON (II).
21. Reset the PCM with the HDS.
22. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
23. Start the engine.
24. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
25. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Start the engine.
30. Check under these conditions: A/C on Temperature control at maximum cool Blower fan at maximum speed Rear window defogger on Headlights on high beam
31. Hold the engine speed at 2, 000 RPM (in P or N) for 1 minute.
32. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BC indicated? YES -Check for poor connections or loose terminals at the alternator and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 29 . If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BD: Starter Cut Relay 2 Malfunction

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

Scheme 189

Scheme 190

Scheme 191

Scheme 192

Scheme 193

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS, and wait 5 seconds.
3. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM.
4. Try to start the engine. Does the engine start? YES -Go to step 13 . NO -Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Check the No. 23 STRLD (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Replace starter cut relay 2, then go to step 23 . NO -Go to step 7.
7. Remove the blown fuse from the under-dash fuse/relay box.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A13 and body ground. Is there continuity? YES -Go to step 11. NO -Replace the No. 23 STRLD (7.5 A) fuse, then go to step 27 .
11. Disconnect under-dash fuse/relay box connector Q (16P) (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-dash-fuserelay-box__removal-and-installation) ).
12. Check for continuity between PCM connector terminal A13 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A13) and the under-dash fuse/relay box, then replace the No. 23 STRLD (7.5 A) fuse, and go to step 22 . NO -Replace the under-dash fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-dash-fuserelay-box__removal-and-installation) ), then go to step 22 .
13. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
14. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 15. NO -Replace starter cut relay 1 (STR), then go to step 23 .
15. Remove starter cut relay 2 (A) from the under-dash fuse/relay box.
16. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 2.2 V or less indicated? YES -Go to step 17. NO -Replace starter cut relay 2, then go to step 23 .
17. Turn the ignition switch to LOCK (0).
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector A (44P).
20. Disconnect under-dash fuse/relay box connector C (4P).
21. Check for continuity between starter cut relay 1 (STR) 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between starter cut relay 1 (STR) and the under-dash fuse/relay box, then go to step 22. NO -Replace the under-dash fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-dash-fuserelay-box__removal-and-installation) ), then go to step 22.
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BD indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BE: Starter Cut Relay 1 Malfunction

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

Scheme 194

Scheme 195

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS, and wait 5 seconds.
3. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 3.2 V or more indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM.
4. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
5. Check the STARTER CUT RELAY in the DATA LIST with the HDS. Is 3.2 V or more indicated? YES -Go to step 6. NO -Replace starter cut relay 1 (STR), then go to step 7 .
6. Measure the voltage between starter cut relay 1 (STR) 4P connector terminal No. 2 and body ground. STARTER CUT RELAY 1 (STR) 4P CONNECTOR Is there 3.2 V or more? YES -Repair a short to power in the wire between starter cut relay 1 (STR), starter cut relay 2, and the PCM, then go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to ON (II).
8. Reset the PCM with the HDS.
9. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
10. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
11. Turn the ignition switch to LOCK (0).
12. Reconnect all connectors.
13. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
14. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BE indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P16BF: Starter Cut Relay STRLY Circuit Malfunction

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

Scheme 196

Scheme 197

Scheme 198

Scheme 199

Scheme 200

Scheme 201

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS, and wait 5 seconds.
3. Check the STARTER CUT CTRL RETURN in the DATA LIST with the HDS. Is OFF indicated? YES -Go to step 4. NO -Go to step 14 .
4. Turn the ignition switch in START (III) and hold its position for 5 seconds or more.
5. While holding the ignition switch in START (III), check the STARTER CUT CTRL RETURN in the DATA LIST. Is OFF indicated? YES -Go to step 6. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM.
6. Turn the ignition switch to LOCK (0).
7. Test the IG2 cut relay and the ACC cut relay (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 8. NO -Replace the IG2 cut relay and/or the ACC cut relay, then go to step 23 .
8. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
9. Remove starter cut relay 2 (A) from the under-dash fuse/relay box.
10. Test starter cut relay 1 (STR) and starter cut relay 2 (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 11. NO -Replace starter cut relay 1 (STR) and/or starter cut relay 2, then go to step 23 .
11. Jump the SCS line with the HDS.
12. Disconnect PCM connector A (44P).
13. Check for continuity between PCM connector terminal A12 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A12) and starter cut relay 1 (STR) or starter cut relay 2, then go to step 23 . NO -Go to step 29 .
14. Turn the ignition switch to LOCK (0).
15. Test the IG2 cut relay and the ACC cut relay (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 16. NO -Replace the IG2 cut relay and/or the ACC cut relay, then go to step 23 .
16. Remove starter cut relay 1 (STR) (A) from under the driver's side of the dashboard.
17. Remove starter cut relay 2 (A) from the under-dash fuse/relay box.
18. Test starter cut relay 1 (STR) and starter cut relay 2 (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Are the relays OK? YES -Go to step 19. NO -Replace starter cut relay 1 (STR) and/or starter cut relay 2, then go to step 23 .
19. Jump the SCS line with the HDS.
20. Disconnect PCM connector A (44P).
21. Turn the ignition switch to ON (II).
22. Measure the voltage between PCM connector terminal A12 and body ground. Is there 1.0 V or more? YES -Repair a short to power in the wire between the PCM (A12) and starter cut relay 1 (STR) or starter cut relay 2, then go to step 23. NO -Go to step 28 .
23. Reconnect all connectors.
24. Turn the ignition switch to ON (II).
25. Reset the PCM with the HDS.
26. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
27. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
28. Turn the ignition switch to LOCK (0).
29. Reconnect all connectors.
30. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
31. Check for Pending or Confirmed DTCs with the HDS. Is DTC P16BF indicated? YES -Check for poor connections or loose terminals at starter cut relay 1 (STR), starter cut relay 2, and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P2183: ECT Sensor 2 Circuit Range/Performance Problem

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

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. Are the connections and terminals OK? YES -Go to step 2. NO -Repair the connections or terminals, then go to step 22 .
2. Turn the ignition switch to ON (II).
3. Check for Pending or Confirmed DTCs with the HDS. Are DTC P1116 and P2183 indicated at the same time? YES -Go to step 12 . NO -Go to step 4.
4. Start the engine, and let it idle for 10 minutes.
5. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 124°F (51°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Allow ECT sensor 2 to cool to ambient temperature.
8. Note the ambient temperature.
9. Turn the ignition switch to ON (II).
10. Note the value of ECT SENSOR 2 quickly in the DATA LIST with the HDS.
11. Compare the value of ECT SENSOR 2 and the ambient temperature. Does ECT SENSOR 2 differ 5.4°F (3°C) or more from the ambient temperature? YES -Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
12. Start the engine, and let it idle for 10 minutes.
13. Check ECT SENSOR 1 in the DATA LIST with the HDS. Is about 127°F (53°C) or less indicated? YES -Replace ECT sensor 1 (see «ECT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 14.
14. Let the engine idle for 10 minutes.
15. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 124°F (51°C) or less indicated? YES -Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ), then go to step 22 . NO -Go to step 16.
16. Turn the ignition switch to LOCK(0).
17. Allow the sensors to cool to ambient temperature.
18. Note the ambient temperature.
19. Turn the ignition switch to ON (II).
20. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.
21. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 2 and the ambient temperature individually. Does one of the sensors differ more than 5.4°F (3°C) from the ambient temperature? YES -Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go to step 22. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM.
22. Turn the ignition switch to ON (II).
23. Reset the PCM with the HDS.
24. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2183 indicated? YES -Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P2184: ECT Sensor 2 Circuit Low Voltage

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

Scheme 202

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F (180°C) or more, or 0.08 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ECT sensor 2 2P connector.
5. Turn the ignition switch to ON (II).
6. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about 356°F(180°C) or more, or 0.08 V or less Indicated? YES -Go to step 7. NO -Go to step 11 .
7. Turn the ignition switch to LOCK (0).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Check for continuity between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there continuity? YES -Repair a short in the wire between ECT sensor 2 and the PCM (A33), then go to step 13 . NO -Go to step 18 .
11. Turn the ignition switch to LOCK (0).
12. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
13. Reconnect all connectors.
14. Turn the ignition switch to ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
20. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2184 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P2185: ECT Sensor 2 Circuit High Voltage

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

Scheme 203

Scheme 204

Scheme 205

Scheme 206

1. Turn the ignition switch to ON (II).
2. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F (-40°C) or less, or 4.90 V or more Indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at ECT sensor 2 and the PCM.
3. Turn the ignition switch to LOCK (0).
4. Disconnect the ECT sensor 2 2P connector.
5. Connect ECT sensor 2 2P connector terminals No. 1 and No. 2 with a jumper wire.
6. Turn the ignition switch to ON (II).
7. Check ECT SENSOR 2 in the DATA LIST with the HDS. Is about -40°F(-40°C) or less, or 4.90 V or more indicated? YES -Go to step 8. NO -Go to step 20 .
8. Turn the ignition switch to LOCK (0).
9. Remove the jumper wire from the ECT sensor 2 2P connector.
10. Turn the ignition switch to ON (II).
11. Measure the voltage between ECT sensor 2 2P connector terminal No. 1 and body ground. Is there about 5 V? YES -Go to step 12. NO -Go to step 16 .
12. Turn the ignition switch to LOCK (0).
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (44P).
15. Check for continuity between PCM connector terminal A9 and ECT sensor 2 2P connector terminal No. 2. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A9) and ECT sensor 2, then go to step 22 .
16. Turn the ignition switch to LOCK (0).
17. Jump the SCS line with the HDS.
18. Disconnect PCM connector A (44P).
19. Check for continuity between PCM connector terminal A33 and ECT sensor 2 2P connector terminal No. 1. Is there continuity? YES -Go to step 27 . NO -Repair an open in the wire between the PCM (A33) and ECT sensor 2, then go to step 22 .
20. Turn the ignition switch to LOCK (0).
21. Replace ECT sensor 2 (see «ECT SENSOR 2 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
22. Reconnect all connectors.
23. Turn the ignition switch to ON (II).
24. Reset the PCM with the HDS.
25. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
26. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
27. Reconnect all connectors.
28. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
29. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2185 indicated? YES -Check for poor connections or loose terminals at ECT sensor 2 and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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, troubleshoot them first, then recheck for DTC P2195.

1. Check for dirt or debris in the MAF sensor/IAT sensor. Is it there any dirt or debris? YES -Remove the dirt or debris. If needed, replace the MAF sensor/IAT sensor 1. (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ) NO -Go to step 2.
2. Check the installation of the A/F sensor (Sensor 1). Is the A/F sensor loose or disconnected from the warm up TWC? YES -Go to step 7 . NO -Go to step 3.
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Start the engine, and let it idle for 2 minutes.
6. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2195 indicated? YES -Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 14 . NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .
7. Turn the ignition switch to LOCK (0).
8. Reinstall the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
9. Turn the ignition switch to ON (II).
10. Reset the PCM with the HDS.
11. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
12. 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 PCM, then go to step 2 . NO -Go to step 13.
13. Monitor the OBD STATUS for DTC P2195 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 12 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 2 . If the HDS indicated NOT COMPLETED, keep idling until a result comes on.
14. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
15. Start the engine, and let it idle for 2 minutes.
16. 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 PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -Go to step 17.
17. Monitor the OBD STATUS for DTC P2195 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 16 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 15 . If the PCM was substituted, go to step 2 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

DTC P2199: IAT Sensor 1, 2 Incorrect Correlation

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

1. Turn the ignition switch to LOCK (0).
2. Remove MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
3. Remove IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ).
4. Cool the sensors to ambient temperature.
5. Note the ambient temperature.
6. Connect the MAF sensor/IAT sensor 1 5P connector and the IAT sensor 2 2P connector.
7. Turn the ignition switch to ON (II).
8. Note the value of IAT SENSOR 1 and IAT SENSOR 2 quickly in the DATA LIST with the HDS.
9. Compare the value of IAT SENSOR 1 and IAT SENSOR 2 to the ambient temperature. Does the value of IAT SENSOR 1 or IAT SENSOR 2 differ 34°F (19°C) or more from the ambient temperature? YES -Go to step 10. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at IAT sensor 1, IAT sensor 2, and the PCM.
10. Replace the sensor that differed more than 34°F (19°C) from the ambient temperature. MAF sensor/IAT sensor 1 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ) IAT sensor 2 (see «MAF SENSOR/IAT SENSOR 1 REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) )
11. Turn the ignition switch to ON (II).
12. Reset the PCM with the HDS.
13. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
14. Turn the ignition switch to LOCK (0).
15. Open the hood, and let the engine cool for more than 6 hours.
16. Start the engine, and let it idle.
17. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2199 indicated? YES -Check for poor connections or loose terminals at IAT sensor 1, IAT sensor 2, and the PCM, then go to step 1 . NO -Go to step 18.
18. Monitor the OBD STATUS for DTC P2199 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 17 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at IAT sensor 1, IAT sensor 2, and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, go to step 14 .

DTC P2227: BARO Sensor Circuit Range/Performance Problem

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

1. Turn the ignition switch to ON (II), and wait 2 seconds.
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 101 kPa (29.9 inHg, 760 mmHg), or about 2.9 V at sea level indicated? YES -Go to step 3. NO -Go to step 7 .
3. Clear the DTC with the HDS.
4. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
5. Test-drive under these conditions: Engine speed above 1, 750 RPM Transmission in D REL TP SENSOR above 22 deg Drive 5 seconds or more
6. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 7. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates NOT COMPLETED, go to step 4 and recheck.
7. Check the intake air system for clogging or restrictions (foreign material, dirty air cleaner element, etc.). Is the intake air system clogged or restricted? YES -Remove the clog or restriction, then go to step 9 . NO -Go to step 8.
8. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
9. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
10. Test-id rive under these conditions: Engine speed above 1, 750 RPM Transmission in D RE L TP SENSOR above 22 deg Drive 5 seconds or more
11. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2227 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 9 . If the PCM was substituted, go to step 1 . NO -Go to step 12.
12. Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 11 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 9 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, go to step 9 .

DTC P2228: BARO Sensor Circuit Low Voltage

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

1. Turn the ignition switch to ON (II).
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 53 kPa (15.6 inHg, 397 mmHg), or 1.58 V or less indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2228 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC P2229: BARO Sensor Circuit High Voltage

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

1. Turn the ignition switch to ON (II).
2. Check the BARO SENSOR in the DATA LIST with the HDS. Is about 160 kPa (47.2 inHg, 1, 200 mmHg), or 4.5 V or more indicated? YES -Go to step 3. NO -Intermittent failure, the system is OK at this time.
3. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2229 indicated? YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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 207

Scheme 208

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle.
4. Check for Pending or Confirmed DTCs with true HDS. Is DTC P2238 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM.
5. Turn the ignition switch to LOCK (0).
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 4P connector.
8. Disconnect PCM connector C (44P).
9. Check for continuity between PCM connector terminal C29 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C29) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
10. Reconnect PCM connector C (44P).
11. Start the engine, and let it idle.
12. Measure the voltage between A/F sensor (Sensor 1) 4P connector terminal No. 1 and body ground. Is there about 2.2 V? YES -Go to step 13. NO -Go to step 23 .
13. Turn the ignition switch to LOCK (0).
14. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. 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 PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 19 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result come on.
21. Turn the ignition switch to LOCK (0).
22. Reconnect all connectors.
23. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
24. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2238 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . NO -Go to step 26.
26. Monitor the OBD STATUS for DTC P2238 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 25 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, keep idling idle 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 209

Scheme 210

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC 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 PCM.
5. Turn the ignition switch to LOCK (0).
6. Jump the SCS line with the HDS.
7. Disconnect the A/F sensor (Sensor 1) 4P connector.
8. Disconnect PCM connector C (44P).
9. Check for continuity between PCM connector terminal C30 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (C30) and the A/F sensor (Sensor 1), then go to step 15 . NO -Go to step 10.
10. Reconnect PCM connector C (44P).
11. Start the engine, and let it idle.
12. Measure the voltage between A/F sensor (Sensor 1) 4P connector terminal No. 2 and body ground. Is there about 2.2 V? YES -Go to step 13. NO -Go to step 21 .
13. Turn the ignition switch to LOCK (0).
14. Replace the A/F sensor (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
15. Reconnect all connectors.
16. Turn the ignition switch to ON (II).
17. Reset the PCM with the HDS.
18. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
19. 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 PCM, then go to step 1 . NO -Go to step 20.
20. Monitor the OBD STATUS for DTC P2252 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated instep 19 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.
21. Turn the ignition switch to LOCK (0).
22. Reconnect all connectors.
23. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
24. Start the engine, and let it idle.
25. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2252 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the PCM was substituted, go to step 1 . NO -Go to step 26.
26. Monitor the OBD STATUS for DTC P2252 in the DTCs MENU with the HDS. Does the HDS indicate PASSED? YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs were indicated in step 25 , go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, go to step 1 . If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then go to step 24 . If the HDS indicates NOT COMPLETED, keep idling idle until a result comes on.

DTC P2270: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean; DTC P2271: Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Vehicle speed at 35 mph (56 km/h) or more for at least 25 seconds
5. Monitor the OBD STATUS for DTC P2270 or P2271 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0).
7. Replace the secondary HO2S (Sensor 2) (see «SECONDARY HO2S REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__secondary-ho2s-replacement) ).
8. Turn the ignition switch to ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine, and let it idle without load (in P or N) until the radiator fan comes on.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Vehicle speed at 35 mph (56 km/h) or more for at least 25 seconds
13. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2270 or P2271 indicated? YES -Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P2270 or P2271 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 «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 12 .

DTC P2610: PCM Ignition Off Internal Timer Malfunction

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2610 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P2610 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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 ).

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
4. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Vehicle speed between 25-55 mph (40-88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds
5. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS. Does the HDS indicate FAILED? YES -Go to step 6. NO -If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 3 and recheck.
6. Turn the ignition switch to LOCK (0).
7. Replace the A/F sensor (Sensor 1) (see «A/F SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__af-sensor-replacement) ).
8. Turn the ignition switch to ON (II).
9. Reset the PCM with the HDS.
10. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
11. Start the engine. Hold the engine speed at 3, 000 RPM without load (in P or N) until the radiator fan comes on, then let it idle.
12. Test-drive under these conditions: Engine coolant temperature (ECT SENSOR 1) above 158°F(70°C) Transmission in D Vehicle speed between 25-55 mph (40-88 km/h) for 5 minutes. Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with the throttle fully closed) for 5 seconds.
13. 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 PCM, then go to step 1 . NO -Go to step 14.
14. Monitor the OBD STATUS for DTC P2A00 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 «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then go to step 1 . If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 11 .

DTC U0028: F-CAN Malfunction (BUS-OFF)

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

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0028 indicated? YES -Go to step 4. NO -Intermittent failure, the system is OK at this time.
4. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ).
5. Check for Pending or Confirmed DTCs with the HDS. Is DTC P0028 indicated? YES -If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the PCM was substituted, go to step 1 . NO -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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

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

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1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS. Are DTC U0028 and U0114 indicated at the same time? YES -Go to troubleshooting for DTC U0028 (see «DTC U0028: F-CAN Malfunction (BUS-OFF)»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-u0028-f-can-malfunction-bus-off) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0114 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the SH-AWD control unit and the PCM.
5. Check for communication to the SH-AWD system with the HDS. Does the HDS communicate with the SH-AWD control unit? YES -Go to step 6. NO -Go to the symptom troubleshooting for the SH-AWD indicator does not go off, and no DTCs are stored (see «DTC 91-1: SH-AWD CONTROL UNIT PROGRAMMING ERROR»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__dtc-91-1-sh-awd-control-unit-programming) ).
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect SH-AWD control unit connector A (20P).
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminals A36 and SH-AWD control unit connector A (20P) terminal No. 10. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A36) and the SH-AWD control unit, then go to step 12 .
11. Check for continuity between PCM connector terminal A37 and SH-AWD control unit connector A (20P) terminal No. 20. Is there continuity? YES -Substitute a known-good SH-AWD control unit (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ), then go to step 12 and recheck. If DTC U0114 is not indicated after substitution, replace the original SH-AWD control unit (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ), then go to step 12. NO -Repair an open in the wire between the PCM (A37) and the SH-AWD control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0114 indicated? YES -Check for poor connections or loose terminals at the SH-AWD control unit, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0122: F-CAN Malfunction (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 ).

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1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS. Are DTC U0028 and U0122 Indicated at the same time? YES -Go to troubleshooting for DTC U0028 (see «DTC U0028: F-CAN Malfunction (BUS-OFF)»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-u0028-f-can-malfunction-bus-off) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0122 indicated? YES -Go to step 5. NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the VSA modulator-control unit and the PCM.
5. Check for communication to the VSA system with the HDS. Does the HDS communicate with the VSA modulator-control unit? YES -Go to step 6. NO -Go to symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off (see «ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components) ).
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect the VSA modulator-control unit 46P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ).
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A36 and VSA modulator-control unit connector terminal No. 39. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A36) and the VSA modulator-control unit, then go to step 12 .
11. Check for continuity between PCM connector terminal A37 and VSA modulator-control unit connector terminal No. 38. Is there continuity? YES -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ), then go to step 12. NO -Repair an open in the wire between the PCM (A37) and the VSA modulator-control unit, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0122 indicated? YES -Check for poor connections or loose terminals at the VSA modulator-control unit, and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

DTC U0155: F-CAN Malfunction (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 ).

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1. Turn the ignition switch to ON (II).
2. Check for Pending or Confirmed DTCs with the HDS. Are DTC U0028 and U0155 indicated at the same time? YES -Go to troubleshooting for DTC U0028 (see «DTC U0028: F-CAN Malfunction (BUS-OFF)»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dtc-u0028-f-can-malfunction-bus-off) ). NO -Go to step 3.
3. Clear the DTC with the HDS.
4. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0155 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 gauge control module and the PCM.
5. Check for communication to the gauge control module with the HDS. Does the HDS communicate with the gauge control module? YES -Go to step 6. NO -Go to the gauge control module input test (see «GAUGE CONTROL MODULE INPUT TEST»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-input-test) ).
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect the gauge control module 36P connector.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A36 and gauge control module 36P connector terminal No. 28. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A36) and the gauge control module, then go to step 12 .
11. Check for continuity between PCM connector terminal A37 and gauge control module 36P connector terminal No. 29. Is there continuity? YES -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step 12 and recheck. If no DTCs are indicated, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then go to step 12. NO -Repair an open in the wire between the PCM (A37) and the gauge control module, then go to step 12.
12. Reconnect all connectors.
13. Turn the ignition switch to ON (II).
14. Reset the PCM with the HDS.
15. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
16. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0155 indicated? YES -Check for poor connections or loose terminals at the gauge control module and the PCM, then go to step 1 . NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ). Do not turn the ignition switch to LOCK (0) or ACC (I) while updating the PCM. If you turn the ignition switch to LOCK (0) or ACC (I) before completion, the PCM will be damaged.

1. Do the PCM update procedure (PGM-FI system and A/T system) (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
2. Check for Pending or Confirmed DTCs with the HDS. Is DTC U0300 indicated? YES -Replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) .

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1. Turn the ignition switch to LOCK (0).
2. Jump the SCS line with the HDS.
3. Disconnect PCM connector A (44P), then disconnect the HDS.
4. Measure the resistance between PCM connector terminals A36 and A37, then compare your reading to the model/trim level listed below. VEHICLE WITH SH-AWD Other Systems Resistance AcuraLink™ and navigation About 79 - 97 ohms Navigation About 82 - 100 ohms Without the above systems About 85 - 103 ohms VEHICLE WITHOUT SH-AWD Other Systems Resistance Acura Link and navigation About 84 - 102 ohms Without the above systems About 90 - 110 ohms Is the value of resistance OK? YES -Go to step 47 . NO -Go to step 5.
5. Do the battery terminal disconnecting procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ), and wait at least 3 minutes before continuing.
6. Disconnect these connectors: Gauge control module 36P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). VSA modulator-control unit 46P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). SRS unit connector A (28P) (see step 14 under «SRS UNIT, FRONT AND SIDE IMPACT SENSORS, ROLL RATE SENSOR, DRIVER'S SEAT POSITION SENSOR, AND FRONT PASSENGER'S WEIGHT SENSORS»(/acura/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system__srs-unit-front-and-side-impact) ). Steering angle sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ). Yaw rate-lateral acceleration sensor 4P connector (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-center-point-writing) ). TPMS control unit 20P connector (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). SH-AWD control unit connector A (20P) (with SH-AWD) (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ). Navigation unit connector A (20P) (if equipped) (see «DVD-ROM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#navigation-system__dvd-rom-replacement) ). AcuraLink™ control unit (XM receiver) connector A (20P) (if equipped) (see «ACURALINK™ CONTROL UNIT-XM RECEIVER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#audio-system) ).
7. Do the battery terminal reconnection procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ).
8. Check for continuity between PCM connector terminals A36 and A37. Is there continuity? YES -Repair short in the wires between PCM connector terminals A36 and A37*. NO -Go to step 9.
9. Check for continuity between PCM connector terminal A36 and gauge control module 36P connector terminal No. 28. Is there continuity? YES -Go to step 10. NO -Repair an open in the wire between the PCM (A36) and the gauge control module.
10. Check for continuity between PCM connector terminal A36 and VSA modulator-control unit 46P connector terminal No. 39. Is there continuity? YES -Go to step 11. NO -Repair an open in the wire between the PCM (A36) and the VSA modulator-control unit.
11. Check for continuity between PCM connector terminal A36 and SRS unit connector A (28P) terminal No. 11. Is there continuity? YES -Go to step 12. NO -Repair an open in the wire between the PCM (A36) and the SRS unit.
12. Check for continuity between PCM connector terminal A36 and steering angle sensor 5P connector terminal No. 4. Is there continuity? YES -Go to step 13. NO -Repair an open in the wire between the PCM (A36) and the steering angle sensor.
13. Check for continuity between PCM connector terminal A36 and yaw rate-lateral acceleration sensor 4P connector terminal No. 3. Is there continuity? YES -Go to step 14. NO -Repair an open in the wire between the PCM (A36) and the yaw rate-lateral acceleration sensor.
14. Check for continuity between PCM connector terminal A36 and TPMS control unit 20P connector terminal No. 1. Is there continuity? YES - With SH-AWD: Go to step 15. Without SH-AWD with navigation: Go to step 16 . Without SH-AWD and navigation: Go to step 18 . NO -Repair an open in the wire between the PCM (A36) and the TPMS control unit.
15. Check for continuity between PCM connector terminal A36 and SH-AWD control unit connector A (20P) terminal No. 10. Is there continuity? YES - With navigation: Go to step 16. Without navigation: Go to step 18 . NO -Repair an open in the wire between the PCM (A36) and the SH-AWD control unit.
16. Check for continuity between PCM connector terminal A36 and navigation unit connector A (20P) terminal No. 8. Is there continuity? YES - With AcuraLink™: Go to step 17. Without AcuraLink™: Go to step 18 . NO -Repair an open in the wire between the PCM (A36) and the navigation unit.
17. Check for continuity between PCM connector terminal A36 and AcuraLink™ control unit (XM receiver) connector A (20P) terminal No. 6. Is there continuity? YES -Go to step 18. NO -Repair an open in the wire between the PCM (A36) and the AcuraLink™ control unit (XM receiver).
18. Check for continuity between PCM connector terminal A37 and gauge control module 36P connector terminal No. 29. Is there continuity? YES -Go to step 19. NO -Repair an open in the wire between the PCM (A37) and the gauge control module.
19. Check for continuity between PCM connector terminal A37 and VSA modulator-control unit 46P connector terminal No. 38. Is there continuity? YES -Go to step 20 NO -Repair an open in the wire between the PCM (A37) and the VSA modulator-control unit.
20. Check for continuity between PCM connector terminal A37 and SRS unit connector A (28P) terminal No. 12. Is there continuity? YES -Go to step 21. NO -Repair an open in the wire between the PCM (A37) and the SRS unit.
21. Check for continuity between PCM connector terminal A37 and steering angle sensor 5P connector terminal No. 2. Is there continuity? YES -Go to step 22. NO -Repair an open in the wire between the PCM connector (A37) and the steering angle sensor.
22. Check for continuity between PCM connector terminal A37 and yaw rate-lateral acceleration sensor 4P connector terminal No. 2. Is there continuity? YES -Go to step 23. NO -Repair an open in the wire between the PCM (A37) and the yaw rate-lateral acceleration sensor.
23. Check for continuity between PCM connector terminal A37 and TPMS control unit 20P connector terminal No. 11. Is there continuity? YES - With SH-AWD: Go to step 24. Without SH-AWD with navigation: Go to step 25 . Without SH-AWD and navigation: Go to step 27 . NO -Repair an open in the wire between the PCM (A37) and the TPMS control unit.
24. Check for continuity between PCM connector terminal A37 and SH-AWD control unit connector A (20P) terminal No. 20. Is there continuity? YES - With navigation: Go to step 25. Without navigation: Go to step 27 . NO -Repair an open in the wire between the PCM (A37) and the SH-AWD control unit.
25. Check for continuity PCM connector terminal A37 and navigation unit connector A (20P) terminal No. 18. Is there continuity? YES - With AcuraLink™: Go to step 26. Without AcuraLink™: Go to step 27 . NO -Repair an open in the wire between the PCM (A37) and the navigation unit.
26. Check for continuity between PCM connector terminal A37 and AcuraLink™ control unit (XM receiver) connector A (20P) terminal No. 16. Is there continuity? YES -Go to step 27. NO -Repair an open in the wire between the PCM (A37) and the AcuraLink™ control unit (XM receiver).
27. Reconnect the gauge control module 36P connector.
28. Measure the resistance between PCM connector terminals A36 and A37. Is there about 108-132 ohms (without SH-AWD) or 2.34-2.86 kohms (with SH-AWD)? YES -Go to step 29. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), then reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
29. Disconnect the gauge control module 36P connector.
30. Reconnect the VSA modulator-control unit 46P connector.
31. Measure the resistance between PCM connector terminals A36 and A37. Is there about 2.34-2.86 kohms? YES -Go to step 32. NO -Replace the VSA modulator-control unit (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ).
32. Disconnect the VSA modulator-control unit 46P connector.
33. Reconnect SRS unit connector A (28P).
34. Measure the resistance between PCM connector terminals A36 and A37. Is there about 2.34-2.86 kohms? YES -Go to step 35. NO -Substitute a known-good SRS unit (see «SRS UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system) ), then reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original SRS unit (see «SRS UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system) ).
35. Disconnect SRS unit connector A (28P).
36. Reconnect TPMS control unit 20P connector.
37. Measure the resistance between PCM connector terminals A36 and A37. Is there about 2.34-2.86 kohms? YES - With SH-AWD: Go to step 38. Without SH-AWD with navigation: Go to step 41 . Without SH-AWD and navigation: Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM. NO -Substitute a known-good TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ), then reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original TPMS control unit (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ).
38. Disconnect the TPMS control unit 20P connector.
39. Reconnect SH-AWD control unit connector A (20P).
40. Measure the resistance between PCM connector terminals A36 and A37. Is there about 108-132 ohms? YES - With navigation: Go to step 41. Without navigation: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good SH-AWD control unit (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ), then reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original SH-AWD control unit (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ).
41. Disconnect SH-AWD control unit connector A (20P) (with SH-AWD) or the TPMS control unit 20P connector (without SH-AWD).
42. Reconnect navigation unit connector A (20P).
43. Measure the resistance between PCM connector terminals A36 and A37. Is there about 2.34-2.86 kohms? YES - With AcuraLink™: Go to step 44. Without AcuraLink™: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good navigation unit (see «DVD-ROM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#navigation-system__dvd-rom-replacement) ) and reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original navigation unit (see «DVD-ROM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#navigation-system__dvd-rom-replacement) ).
44. Disconnect navigation unit connector A (20P).
45. Reconnect the AcuraLink™ control unit (XM receiver) connector A (20P).
46. Measure the resistance between PCM connector terminals A36 and A37. Is there about 2.34-2.86 kohms? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Substitute a known-good AcuraLink™ control unit (XM receiver) (see «ACURALINK™ CONTROL UNIT-XM RECEIVER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#audio-system) ), then reconnect PCM connector A (44P). If the HDS identifies the vehicle, replace the original AcuraLink™ control unit (XM receiver) (see «ACURALINK™ CONTROL UNIT-XM RECEIVER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#audio-system) ).
47. Do the battery terminal disconnection procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ), and wait at least 3 minutes before starting work.
48. Disconnect these connectors: Gauge control module 36P connector (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). VSA modulator-control unit 46P connector (see «VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). SRS unit connector A (28P) (see step 14 under «SRS UNIT, FRONT AND SIDE IMPACT SENSORS, ROLL RATE SENSOR, DRIVER'S SEAT POSITION SENSOR, AND FRONT PASSENGER'S WEIGHT SENSORS»(/acura/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system__srs-unit-front-and-side-impact) ). Steering single sensor 5P connector (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ). Yaw rate-lateral acceleration sensor 4P connector (see «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-center-point-writing) ). TPMS control unit 20P connector (see «TPMS CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). SH-AWD control unit connector A (20P) (with SH-AWD) (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ). Navigation unit connector A (20P) (if equipped) (see «DVD-ROM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#navigation-system__dvd-rom-replacement) ). AcuraLink™ control unit (XM receiver) connector A (20P) (if equipped) (see «ACURALINK™ CONTROL UNIT-XM RECEIVER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#audio-system) ).
49. Do the battery terminal reconnection procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ).
50. Check for continuity between PCM connector terminal A36 and body ground. Is there continuity? YES -Repair a short in the wire between PCM connector terminal A36 and the gauge control module, the VSA modulator-control unit, the SRS unit, the steering angle sensor, the yaw rate-lateral acceleration sensor, the TPMS control unit, the SH-AWD control unit, the navigation unit, the AcuraLink™ control unit (XM receiver), or the DLC. NO -Go to step 51.
51. Check for continuity between PCM connector terminal A37 and body ground. Is there continuity? YES -Repair a short in the wire between PCM connector terminal A37 and the gauge control module, the VSA modulator-control unit, the SRS unit, the steering angle sensor, the yaw rate-lateral acceleration sensor, the TPMS control unit, the SH-AWD control unit, the navigation unit, the AcuraLink™ control unit (XM receiver), or the DLC. NO -Go to step 52.
52. Reconnect all connectors.
53. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
54. Disconnect the gauge control module 36P connector.
55. 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/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ). NO -Go to step 56.
56. Turn the ignition switch to LOCK (0).
57. Reconnect the gauge control module 36P connector.
58. Disconnect the VSA modulator-control unit 46P connector.
59. 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/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__vsa-modulator-control-unit-removal-and-installation) ). NO -Go to step 60.
60. Turn the ignition switch to LOCK (0).
61. Reconnect the VSA modulator-control unit 46P connector.
62. Disconnect SRS unit connector A (28P).
63. 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/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system) ). NO -Go to step 64.
64. Turn the ignition switch to LOCK (0).
65. Reconnect SRS unit connector A (28P).
66. Disconnect the steering angle sensor 5P connector.
67. Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the steering angle sensor (see «STEERING ANGLE SENSOR REPLACEMENT»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-replacement) ). NO -Go to step 68.
68. Turn the ignition switch to LOCK (0).
69. Reconnect the steering angle sensor 5P connector.
70. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
71. 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 «STEERING ANGLE SENSOR CENTER POINT WRITING»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components__steering-angle-sensor-center-point-writing) ). NO -Go to step 72.
72. Turn the ignition switch to LOCK (0).
73. Reconnect the yaw rate-lateral acceleration sensor.
74. Disconnect the TPMS control unit 20P connector.
75. 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/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-control-unit-replacement) ). NO - With SH-AWD: Go to step 76. Without SH-AWD with navigation: Go to step 80 . Without SH-AWD and navigation: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
76. Turn the ignition switch to LOCK (0).
77. Reconnect the TPMS control unit 20P connector.
78. Disconnect SH-AWD control unit connector A (20P).
79. Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the SH-AWD control unit (see «SH-AWD® CONTROL UNIT REPLACEMENT»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__sh-awdr-control-unit-replacement) ). NO - With navigation: Go to step 80. Without navigation: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
80. Turn the ignition switch to LOCK (0).
81. Reconnect SH-AWD control unit connector A (20P) (with SH-AWD) or the TPMS control unit 20P connector (without SH-AWD).
82. Disconnect navigation unit connector A (20P).
83. Turn the ignition switch to ON (II), and read the HDS. Does the HDS identify the vehicle? YES -Replace the navigation unit (see «DVD-ROM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/entertainment-systems/#navigation-system__dvd-rom-replacement) ). NO - With AcuraLink™: Go to step 84. Without AcuraLink™: Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
84. Turn the ignition switch to LOCK (0).
85. Reconnect navigation unit connector A (20P).
86. Disconnect AcuraLink™ control unit (XM receiver) connector A (20P).
87. 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/rdx/i-2009-2012/remont/entertainment-systems/#audio-system) ). NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).

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1. Turn the ignition switch to ON (II).
2. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ). Does the MIL flash? YES -Go to step 3. NO -Substitute a known-good gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ), and recheck. If the MIL circuit is OK, replace the original gauge control module (see «GAUGE CONTROL MODULE REPLACEMENT»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__gauge-control-module-replacement) ).
3. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
4. Check the SCS in the DATA LIST with the HDS. Is a short indicated? YES -Go to step 5. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
5. Turn the ignition switch to LOCK (0).
6. Disconnect PCM connector A (44P), then disconnect the HDS.
7. Check for continuity between PCM connector terminal A31 and body ground. Is there continuity? YES -Repair a short in the wire between the PCM (A31) and the SRS unit or the DLC. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-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.

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1. Turn the ignition switch to LOCK (0).
2. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
3. 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 .
4. Check for Pending or Confirmed DTCs in the PGM-FI system with the HDS. Are any Pending or Confirmed DTCs indicated? YES -Go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO - If the HDS does not communicate with the SRS, go to step 5. If the HDS does not communicate with the VSA system, go to step 7 . If the HDS does not communicate with the SH-AWD system, go to step 9 . If the HDS does not communicate with the TPMS 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 .
5. Turn the ignition switch to LOCK (0).
6. 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 7. NO -Go to the SRS general troubleshooting information (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/airbag/#srs-supplemental-restraint-system) ).
7. Turn the ignition switch to LOCK (0).
8. 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 9. NO -Go to the VSA symptom troubleshooting for ABS indicator, brake system indicator, VSA indicator do not go off (see «ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF»(/acura/rdx/i-2009-2012/remont/anti-locktraction-control/#vsa-system-components) ).
9. Turn the ignition switch to LOCK (0).
10. Turn the ignition switch to ON (II), and watch the SH-AWD indicator. Does the SH-AWD indicator come on and go off? YES -Go to step 11. NO -Go to the SH-AWD symptom troubleshooting for SH-AWD indicator does not go off, and no DTCs are stored (see «DTC 91-1: SH-AWD CONTROL UNIT PROGRAMMING ERROR»(/acura/rdx/i-2009-2012/remont/differentials-drive-axles/#rear-differential__dtc-91-1-sh-awd-control-unit-programming) ).
11. Turn the ignition switch to LOCK (0).
12. 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 13. 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/rdx/i-2009-2012/remont/wheel-tire-system/#tpms-tire-pressure-monitoring-system__tpms-indicator-does-not-come-on) ).
13. Turn the ignition switch to LOCK (0).
14. Turn the ignition switch to ON (II), and watch the immobilizer indicator. Does the immobilizer indicator stay on or flash? YES -Troubleshoot the immobilizer system (see «SYMPTOM TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/door-locks-anti-theft-systems/#immobilizer-system) ). NO -Go to step 15.
15. Do the gauge self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#gauges__self-diagnostic-function) ).
16. Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/communication-devices/#multiplex-integrated-control-system) ). Are any B-CAN DTCs indicated? YES -Go to the indicated «DTCS TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) . NO -Go to step 17.
17. Turn the ignition switch to LOCK (0), then do the battery terminal disconnecting procedure (see «USING THE GR8 BATTERY DIAGNOSTIC STATION»(/acura/rdx/i-2009-2012/remont/body-electrical/#battery) ), and wait at least 3 minutes before starting work.
18. Disconnect the HDS from the DLC.
19. Check for continuity between DLC terminal No. 7 and body ground. Is there continuity? YES -Go to step 20. NO -Go to step 21 .
20. 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 (28P) VSA modulator-control unit 46P connector SH-AWD control unit connector A (20P) (With SH-AWD) TPMS control unit 20P connector Immobilizer-keyless control unit 7P connector Audio unit 17P connector Under-dash fuse/relay box connector Q(16P) Does continuity go away when one of the above parts is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair a short in the wire between the DLC (K-line) and the VSA modulator-control unit, the SRS unit, the SH-AWD control unit (With SH-AWD), the TPMS control unit, the immobilizer-keyless control unit, the audio unit, or the under-dash fuse/relay box.
21. Connect DLC terminal No. 7 to body ground with a jumper wire.
22. Check for continuity between body ground and the following connector terminals, with all listed control units disconnected. Connector Terminal SRS unit A (28P) No. 24 (LT BLU) VSA modulator-control unit (46P) No. 15 (LT BLU) SH-AWD control unit A (20P) (With SH-AWD) No. 5 (LT BLU) TPMS control unit (20P) No. 7 (LT BLU) Immobilizer-keyless control unit (7P) No. 5 (LT BLU) Audio unit A (17P) No. 6 (LT BLU) Under-dash fuse/relay box (Q) (16P) No. 8 (LT BLU) Is there continuity between the DLC terminal and each of the terminals in the chart? YES -Replace the unit that cannot communicate with the HDS. NO -Repair an open in the wire between the DLC (K-line) and the appropriate connector.
23. Check for B-CAN system DTCs without the HDS (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/communication-devices/#multiplex-integrated-control-system) ). Is DTC B1168, B1169, and/or B1178 indicated? YES -Go to step 34 . NO -Go to step 24.
24. Turn the ignition switch to LOCK (0).
25. Disconnect the HDS from the DLC.
26. Measure the voltage between DLC terminal No. 16 and body ground. Is there battery voltage? YES -Go to step 27. NO -Repair an open in the wire between DLC terminal No. 16 and the No. 19 Fl MAIN (15 A) fuse in the under-hood fuse/relay box.
27. Measure the voltage between DLC terminals No. 4 and No. 16. Is there battery voltage? YES -Go to step 28. NO -Repair an open in the wire between DLC terminal No. 4 and G501 (see «CONNECTOR TO HARNESS INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#connectors-and-harnesses__connector-to-harness-index) ).
28. Connect the HDS to the DLC (see «GENERAL TROUBLESHOOTING INFORMATION»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).
29. Jump the SCS line with the HDS.
30. Disconnect PCM connector A (44P).
31. Disconnect the HDS from the DLC.
32. Check for continuity between PCM connector terminal A36 and DLC terminal No. 6. Is there continuity? YES -Go to step 33. NO -Repair an open in the wire between the PCM (A36) and DLC terminal No. 6.
33. Check for continuity between PCM connector terminal A37 and DLC terminal No. 14. Is there continuity? YES -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between the PCM (A37) and DLC terminal No. 14.
34. Try to start the engine. Does the engine start and idle? YES -Go to the F-CAN circuit troubleshooting (see «F-CAN CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system) ). NO - If the starter cranks, turn the ignition switch to LOCK (0), and go to step 37 . If the starter does not crank, go to step 35.
35. Turn the ignition switch to LOCK (0).
36. Check the No. 2 IG MAIN (50 A) fuse in the under-hood fuse/relay box. Is the fuse OK? YES -Repair an open in the wire between the No. 2 IG MAIN (50 A) fuse and the ignition switch. If the wire is OK, go to step 37. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 2 IG MAIN (50 A) fuse.
37. Inspect the No. 19 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.
38. Remove the blown No. 19 Fl MAIN (15 A) fuse from the under-hood fuse/relay box.
39. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
40. Check for continuity between body ground and PGM-FI main relay 1 4P connector terminals No. 1 and No. 3 individually. Is there continuity? YES -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ). Also replace the No. 19 Fl MAIN (15 A) fuse. NO -Go to step 41.
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 PCM connector A (44P) Each injector 2P connector Camshaft position (CMP) sensor B 3P connector Crankshaft position (CKP) sensor 3P connector Electronic throttle control system (ETCS) control relay Does continuity go away when one of the above parts is disconnected? YES -Replace the part that made the short to body ground go away when disconnected. If the part is the PCM, update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). Also replace the No. 19 Fl MAIN (15 A) fuse. NO -Go to step 42.
42. Disconnect these parts or connectors: PGM-FI main relay 2 PCM connector A (44P) Injectors Camshaft position (CMP) sensor B Crankshaft position (CKP) sensor Electronic throttle control system (ETCS) control relay
43. Check for continuity between PGM-FI main relay 1 4P connector terminal No. 2 and body ground. Is there continuity? YES -Repair a short in the wire between PGM-FI main relay 1 and each part. Also replace the No. 19 Fl MAIN (15 A) fuse. NO -Replace PGM-FI main relay 1. Also replace the No. 19 Fl MAIN (15 A) fuse.
44. Inspect the No. 2 FUEL PUMP (20 A) fuse in the under-dash fuse/relay box. Is the fuse OK? YES -Go to step 51 . NO -Go to step 45.
45. Remove the blown No. 2 FUEL PUMP (20 A) fuse from the under-dash fuse/relay box.
46. Jump the SCS line with the HDS.
47. Disconnect PCM connector C (44P).
48. Check for continuity between PCM connector terminal C36 and body ground. Is there continuity? YES -Go to step 49. NO -Replace the No. 2 FUEL PUMP (20 A) fuse, and update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
49. Remove the driver's dashboard undercover (see «CENTER PANEL REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/gauges-instrument-panels/#dashboard__center-panel-removalinstallation) ), then remove PGM-FI main relay 2 (A) from the under-dash fuse/relay box.
50. Check for continuity between PCM connector terminal C36 and body ground. Is there continuity? YES -Repair a short in the wire between the No. 2 FUEL PUMP (20 A) fuse and the PCM (C36), between the No. 2 FUEL PUMP (20 A) fuse and PGM-FI main relay 2, or between the No. 2 FUEL PUMP (20 A) fuse and the immobilizer-keyless control unit. Also replace the No. 2 FUEL PUMP (20 A) fuse. NO -Go to step 51.
51. Jump the SCS line with the HDS.
52. Disconnect PCM connectors A (44P) and C (44P) (if not disconnected).
53. Turn the ignition switch to ON (II).
54. Measure the voltage between PCM connector terminal C36 and body ground. Is there battery voltage? YES -Go to step 55. NO -Repair an open in the wire between the No. 2 FUEL PUMP (20 A) fuse and the PCM (C36).
55. Measure the voltage between PCM connector terminal A6 and body ground. Is there battery voltage? YES -Go to step 60 . NO -Go to step 56.
56. Turn the ignition switch to LOCK (0).
57. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
58. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 3 and body ground. Is there battery voltage? YES -Go to step 59. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
59. Check for continuity between PCM connector terminal A6 and PGM-FI main relay 1 4P connector terminal No. 4. Is there continuity? YES -Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). If the relay is OK, update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ). NO -Repair an open in the wire between the PCM (A6) and PGM-FI main relay 1.
60. Turn the ignition switch to LOCK (0).
61. Remove PGM-FI main relay 1 (A) from the under-hood fuse/relay box.
62. Measure the voltage between PGM-FI main relay 1 4P connector terminal No. 1 and body ground. Is there battery voltage? YES -Go to step 63. NO -Replace the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
63. Check for continuity between PCM connector terminal A8 and PGM-FI main relay 1 4P connector terminal No. 2. Is there continuity? YES -Go to step 64. NO -Repair an open in the wire between the PCM (A8) and PGM-FI main relay 1.
64. Test PGM-FI main relay 1 (see «POWER RELAY TEST»(/acura/rdx/i-2009-2012/remont/body-electrical/#relays__power-relay-test) ). Is PGM-FI main relay 1 OK? YES -Go to step 65. NO -Replace PGM-FI main relay 1.
65. Jump the SCS line with the HDS.
66. Disconnect PCM connector B (44P).
67. Check for continuity between body ground and PCM connector terminals B1, B36, C2, C40, and C44 individually. Is there continuity? YES -Go to step 68. NO -Repair an open in the wire between the PCM (B1, B36, C2, C40, C44) and G101 (see «CONNECTOR TO FUSE/RELAY BOX INDEX»(/acura/rdx/i-2009-2012/remont/body-electrical/#fuserelay-boxes__connector-to-fuserelay-box-index) ).
68. Check for continuity between PCM connector terminal C13 and body ground. Is there continuity? YES -Go to step 69. NO -Go to step 70 .
69. Continue to check for continuity between PCM connector terminal C13 and body ground, while disconnecting these connectors, one at a time: MAP sensor 3P connector Input shaft (mainshaft) speed sensor 3P connector Does continuity go away when one of the above parts is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair a short in the wire between the PCM (C13) and the MAP sensor or the input shaft (mainshaft) speed sensor.
70. Check for continuity between PCM connector terminal B18 and body ground. Is there continuity? YES -Go to step 71. NO -Go to step 72 .
71. Continue to check for continuity between PCM connector terminal B18 and body ground, while disconnecting these connectors, one at a time: Turbocharger boost sensor 3P connector Output shaft (countershaft) speed sensor 3P connector Does continuity go away when one of the above parts is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair a short in the wire between the PCM (B18) and the turbocharger boost sensor or the output shaft (countershaft) speed sensor.
72. Check for continuity between PCM connector terminal C12 and body ground. Is there continuity? YES -Go to step 73. NO -Go to step 74 .
73. Continue to check for continuity between PCM connector terminal C12 and body ground, while disconnecting the throttle body 6P connector. Is there continuity? YES -Repair a short in the wire between the PCM (C12) and the throttle body. NO -Replace the throttle body (see «THROTTLE BODY REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-removalinstallation) ).
74. Check for continuity between PCM connector terminal A25 and body ground. Is there continuity? YES -Go to step 75. NO -Go to step 76 .
75. Continue to check for continuity between PCM connector terminal A25 and body ground, while disconnecting the APP sensor 6P connector. Is there continuity? YES -Repair a short in the wire between the PCM (A25) and APP sensor A. NO -Replace the accelerator pedal module (see «APP SENSOR SIGNAL INSPECTION»(/acura/rdx/i-2009-2012/remont/engine-control-systems/#electronic-throttle-control-system__app-sensor-signal-inspection) ).
76. Check for continuity between PCM connector terminal A24 and body ground. Is there continuity? YES -Go to step 77. NO -Go to step 78 .
77. Continue to check for continuity between PCM connector terminal A24 and body ground, while disconnecting the APP sensor 6P connector. Is there continuity? YES -Repair a short in the wire between the PCM (A24) and APP sensor B. NO -Replace the accelerator pedal module (see «APP SENSOR SIGNAL INSPECTION»(/acura/rdx/i-2009-2012/remont/engine-control-systems/#electronic-throttle-control-system__app-sensor-signal-inspection) ).
78. Check for continuity between PCM connector terminal A19 and body ground. Is there continuity? YES -Go to step 79. NO -Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__substituting-the-pcm) ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see «PCM REPLACEMENT»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-replacement) ).
79. Continue to check for continuity between PCM connector terminal A19 and body ground, while disconnecting these connectors, one at a time: A/C pressure sensor 3P connector FTP sensor 3P connector Brake booster pressure sensor 3P connector Does continuity go away when one of the above parts is disconnected? YES -Replace the part that caused an open when it was disconnected. NO -Repair a short in the wire between the PCM (A19) and the A/C pressure sensor, the FTP sensor, or the brake booster pressure sensor.

Scheme 281

Scheme 282

1. Relieve fuel pressure (see «FUEL PRESSURE RELIEVING»(/acura/rdx/i-2009-2012/remont/fuel-system/#fuel-supply-system__fuel-pressure-relieving) ).
2. Remove the charge air cooler (see «REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the throttle body 6P connector, then remove the injector cover (A).
4. Disconnect the connectors (B) from the injectors, then remove the harness holder (C) from the fuel rail (D).
5. Disconnect the quick-connect fitting (E).
6. Remove the fuel rail mounting nuts (F), then remove the fuel rail.
7. Remove the injector clips (G) from the injectors.
8. Remove the injectors from the fuel rail.
9. Coat the new O-rings (black) (A) with clean engine oil, then insert the injectors (B) into the fuel rail (C).
10. Install the injector clips (D).
11. Coat the new O-rings (green) (E) with clean engine oil, then install the fuel rail and injectors in the injector base (F).
12. Install the fuel rail mounting nuts (G).
13. Connect the connectors on the injectors, and install the harness holder on the fuel rail.
14. Connect the quick-connect fitting.
15. 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 check for fuel leakage.
16. Reinstall the injector cover, and connect the throttle body 6P connector.
17. Reinstall the charge air cooler (see «INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
18. Clear any stored DTCs with the HDS.

A/F Sensor Replacement

Special Tools Required

O2 Sensor Wrench Snap-on S6154, commercially available

Scheme 283

1. Disconnect the A/F sensor 4P connector (A), then remove the A/F sensor (B).
2. Install the parts in the reverse order of removal.

Secondary HO2S Replacement

Special Tools Required

O2 Sensor Wrench Snap-on YA8875 or O2 Sensor Wrench, E19 SP Tools 93750 or equivalent, commercially available

Scheme 284

Scheme 285

Scheme 286

1. Raise the vehicle on a lift.
2. Remove the WU-TWC bracket (A). Without SH-AWD With SH-AWD
3. Disconnect the secondary HO2S 4P connector (A), then remove the secondary HO2S (B).
4. Install the parts in the reverse order of removal.

Scheme 287

1. Remove the charge air cooler (see «REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
2. Remove the air bypass outlet pipe (see «CHARGE AIR COOLER REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
3. Disconnect the CMP sensor B connector (A).
4. Remove CMP sensor B (B).
5. Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 288

1. Raise the vehicle on a lift.
2. Disconnect the CKP sensor connector (A).
3. Remove the CKP sensor (B).
4. Install the parts in the reverse order of removal with a new O-ring (C).
5. Do the CKP pattern clear/CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__hds-clear-command) ).

Scheme 289

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

Scheme 290

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

Scheme 291

1. Remove the charge air cooler cover (see «REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
2. Disconnect the IAT sensor 2 connector (A).
3. Remove IAT sensor 2 (B).
4. Install the parts in the reverse order of removal with a new O-ring (C).

Scheme 292

Scheme 293

1. Drain the engine coolant (see «COOLANT CHECK»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ).
2. Remove the air cleaner (see «AIR CLEANER REMOVAL/INSTALLATION»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system) ).
3. Remove the charge air cooler (see «REMOVAL»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-manifold-and-exhaust-system) ).
4. Remove the ignition coil cover (A) and bolt (B)
5. Disconnect the ignition coil connectors (C), CMP sensor A connector (D), CMP sensor B connector (E), and the EVAP canister purge valve connector (F).
6. Remove the harness holder (G). NOTE: Be careful not to damage the ECT sensor 1 harness.
7. Disconnect the ECT sensor 1 connector (A).
8. Remove ECT sensor 1 (B).
9. Install the parts in the reverse order of removal with a new O-ring (C).
10. Refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ).

Scheme 294

1. Remove the splash shield.
2. Drain the engine coolant (see «COOLANT CHECK»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ).
3. Disconnect the ECT sensor 2 connector (A).
4. Remove ECT sensor 2 (B).
5. Install the parts in the reverse order of removal with a new O-ring (C).
6. Refill the radiator with engine coolant (see «COOLANT CHECK»(/acura/rdx/i-2009-2012/remont/cooling-fan/#engine-cooling-system) ).

Scheme 295

1. Disconnect the knock sensor connector (A).
2. Remove the knock sensor (B).
3. Install the parts in the reverse order of removal.

Scheme 296

Scheme 297

Scheme 298

Scheme 299

1. Remove the under-hood fuse/relay box (see «REMOVAL AND INSTALLATION»(/acura/rdx/i-2009-2012/remont/fuses-circuit-breakers/#under-hood-fuserelay-box__removal-and-installation) ).
2. Remove the screw (A).
3. Turn the housing over, then remove the screw (A).
4. Turn the housing over again. Using two flat-tip screwdrivers, release the tabs (A), and pry up the fuse/relay box base (B) from the fuse/relay box housing (C). NOTE: Make sure the terminals (D) are not bent or damaged.
5. Remove the ELD (A).
6. Install the parts in the reverse order of removal.

PCM Update

Special Tools Required

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

Any one of the above updating tools can be used.

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

Scheme 300

1. Turn the ignition switch to ON (II), but do not start the engine.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
3. Make sure the HDS communicates with the PCM and other vehicle systems. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ).
4. Exit the HDS diagnostic system, then select the update mode with the HDS, and follow the screen prompts to update the PCM.
5. If the software in the PCM is the latest, disconnect the updating tool from the DLC, and go back to the procedure that you were doing. If the software in the PCM is not the latest, follow the instructions on the screen. If prompted to choose the PGM-FI system or the A/T system, make sure you update both. NOTE: If the PCM update system requires you to cool the PCM, follow the instructions on screen. If you run into a problem during the update procedure (programming takes over 15 minutes, status bar goes over 100 %, D or immobilizer indicator flashes, HDS tablet freezes, etc.), follow these steps to minimize the chance of damaging the PCM: Leave the ignition switch in the 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 try the update procedure again.
6. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
7. Do the CKP pattern clear/CKP pattern learn procedure (see «CKP PATTERN CLEAR/CKP PATTERN LEARN»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems) ).

PCM Replacement

Special Tools Required

1. Honda Diagnostic System (HDS) tablet tester
2. Honda Interface Module (HIM) and an iN workstation with the latest HDS software version
3. HDS pocket tester
4. GNA600 and an iN workstation with the latest HDS software version
5. MVCI unit with the latest control module (CM) update software installed
6. Any one of the above updating tools can be used.

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

Scheme 301

Scheme 302

Scheme 303

1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the PCM and all other vehicle systems. If it does not, go to the DLC circuit troubleshooting (see «DLC CIRCUIT TROUBLESHOOTING»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__dlc-circuit-troubleshooting) ). If the result of the DLC circuit troubleshooting is to replace the PCM, skip steps 4 and 5 , 14 through 16 , and 19 , and do the following procedures after replacing the PCM: Replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/rdx/i-2009-2012/remont/lubrication-system/#engine-lubrication) ) and the engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rdx/i-2009-2012/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ).
4. USA, Canada models: Select the PGM-FI system with the HDS.
5. USA, Canada models: Select the REPLACE PCM MENU, then select READ DATA, and follow the HDS screen prompts. NOTE: Doing this step copies (READS) the engine oil life data from the original PCM so you can later download (WRITES) it into a new PCM. If READ DATA indicates FAILED, continue with this procedure.
6. Turn the ignition switch to LOCK (0).
7. Jump the SCS line with the HDS.
8. Disconnect PCM connectors A, B, and C. NOTE: PCM connectors A, B, and C have symbols (A=[], B=delta, C=o) embossed on them for identification.
9. Remove the bolts (D), and remove the PCM assembly (E).
10. Remove the cover (A), and the bracket (B) from the PCM (C).
11. Install the parts in the reverse order of removal.
12. Turn the ignition switch to ON (II).
13. Manually input the VIN to the PCM with the HDS. NOTE: DTC P0630 VIN Not Programmed or Mismatch may be stored because the VIN has not been programmed into the PCM; ignore it, and continue this procedure.
14. USA, Canada models: If the READ DATA (engine oil life) failed in step 5 , go to step 17 . Otherwise, go to step 15.
15. USA, Canada models: Select the PGM-FI system with the HDS.
16. USA, Canada models: Select the REPLACE PCM MENU, then select WRITE DATA, and follow the HDS prompts. NOTE: If the WRITE DATA indicates FAILED, continue with this procedure.
17. Select IMMOBI system with the HDS.
18. Enter the immobilizer PCM code that you got from the iN, and use the PCM replacement procedure in the IMMOBI MENU of the HDS; it allows you to start the engine.
19. USA, Canada models: If the READ DATA failed in step 5 or the WRITE DATA failed in step 16 , replace the engine oil (see «ENGINE OIL REPLACEMENT»(/acura/rdx/i-2009-2012/remont/lubrication-system/#engine-lubrication) ) and engine oil filter (see «ENGINE OIL FILTER REPLACEMENT»(/acura/rdx/i-2009-2012/remont/lubrication-system/#engine-lubrication__engine-oil-filter-replacement) ), then go to step 20.
20. Clean the throttle body (see «THROTTLE BODY TEST»(/acura/rdx/i-2009-2012/remont/mechanical/#intake-air-system__throttle-body-test) ).
21. Select PGM-FI system, and reset the PCM with the HDS.
22. Update the PCM if it does not have the latest software (see «PCM UPDATE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#pgm-fi-system__pcm-update) ).
23. Do the PCM idle learn procedure (see «PCM IDLE LEARN PROCEDURE»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#idle-control-system__pcm-idle-learn-procedure) ).
24. Do the CKP pattern clear/CKP pattern learn procedure (see «HDS CLEAR COMMAND»(/acura/rdx/i-2009-2012/remont/testing-diagnostics/#fuel-and-emissions-systems__hds-clear-command) ).

See also:
• GENERAL TROUBLESHOOTING INFORMATION
• PCM IDLE LEARN PROCEDURE
• SUBSTITUTING THE PCM
• AIR CLEANER ELEMENT INSPECTION/REPLACEMENT
• FAN MOTOR TEST
• RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING
• POWER RELAY TEST
• REMOVAL AND INSTALLATION
• FUEL PRESSURE TEST
• FUEL PRESSURE REGULATOR REPLACEMENT
• SPARK PLUG INSPECTION
• VTEC ROCKER ARM TEST
• REMOVAL
• CONNECTOR TO FUSE/RELAY BOX INDEX
• ENGINE COMPRESSION INSPECTION
• ROCKER ARM ASSEMBLY REMOVAL
• CAM CHAIN REMOVAL
• THROTTLE BODY REMOVAL/INSTALLATION
• THROTTLE BODY TEST
• ALTERNATOR REMOVAL AND INSTALLATION
• BATTERY TEST
• TRANSMISSION RANGE SWITCH TEST
• REMOVAL AND INSTALLATION
• DTC 91-1: SH-AWD CONTROL UNIT PROGRAMMING ERROR
• SH-AWD® CONTROL UNIT REPLACEMENT
• ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF
• VSA MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION
• GAUGE CONTROL MODULE INPUT TEST
• GAUGE CONTROL MODULE REPLACEMENT
• SRS UNIT, FRONT AND SIDE IMPACT SENSORS, ROLL RATE SENSOR, DRIVER'S SEAT POSITION SENSOR, AND FRONT PASSENGER'S WEIGHT SENSORS
• STEERING ANGLE SENSOR REPLACEMENT
• STEERING ANGLE SENSOR CENTER POINT WRITING
• TPMS CONTROL UNIT REPLACEMENT
• DVD-ROM REPLACEMENT
• ACURALINK™ CONTROL UNIT-XM RECEIVER REMOVAL/INSTALLATION
• SRS UNIT REPLACEMENT
• SELF-DIAGNOSTIC FUNCTION
• TPMS INDICATOR DOES NOT COME ON, AND NO DTCS ARE STORED
• SYMPTOM TROUBLESHOOTING INFORMATION
• GENERAL TROUBLESHOOTING INFORMATION
• CONNECTOR TO HARNESS INDEX
• CENTER PANEL REMOVAL/INSTALLATION
• APP SENSOR SIGNAL INSPECTION
• FUEL PRESSURE RELIEVING
• HDS CLEAR COMMAND
• ENGINE OIL REPLACEMENT
• ENGINE OIL FILTER REPLACEMENT
• MAF SENSOR/IAT SENSOR 1 REPLACEMENT
• PCM UPDATE
• PCM REPLACEMENT
• A/F SENSOR REPLACEMENT
• SECONDARY HO2S REPLACEMENT
• DTC P0301: NO. 1 CYLINDER MISFIRE DETECTED; DTC P0302: NO. 2 CYLINDER MISFIRE DETECTED; DTC P0303: NO. 3 CYLINDER MISFIRE DETECTED; DTC P0304: NO. 4 CYLINDER MISFIRE DETECTED
• DTC P062F: PCM INTERNAL CONTROL MODULE KEEP ALIVE MEMORY (KAM) ERROR
• DTC U0028: F-CAN Malfunction (BUS-OFF)
• DLC CIRCUIT TROUBLESHOOTING