Content .. 672 673 674 675 ..

Acura RL. Manual - part 674

19. Turn the ignition switch OFF.

20. Replace the secondary HO2S (Sensor 2) (see SECONDARY HO2S REPLACEMENT ).

21. Reconnect all connectors.

22. Turn the ignition switch ON (II).

23. Reset the PCM with the HDS.

24. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

25. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

26. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C)



Transmission in D position



Engine speed at 1,500-3,000 RPM



Drive 1 minute or more

27. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0138 and/or P0158* indicated?

YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM,
then go to step 1.

NO - Go to step 28.

28. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 27,
go to the indicated DTCs troubleshooting

NO - If the screen 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 screen indicates EXECUTING, keep driving
until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25.

29. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

30. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

31. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C)



Transmission in D position



Engine speed at 1,500-3,000 RPM



Drive 1 minute or more

32. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0138 and/or P0158* indicated?

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 38

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 ), then go
to step 30. If the PCM was substituted, go to step 1.

NO - Go to step 33.

33. Monitor the OBD STATUS for DTC P0138 and/or P0158* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated
in step 32, go to the indicated DTCs troubleshooting

NO - If the screen 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 ), then go to step 30. If the PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, go to step 30.

DTC P0139: REAR SECONDARY HO2S (BANK 1, SENSOR 2) CIRCUIT SLOW RESPONSE;
DTC P0159: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) CIRCUIT SLOW RESPONSE

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

4. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C)



Transmission in D position



Vehicle speed between 35-55 mph (56-88 km/h)



Drive 5 minutes or more

5. Monitor the OBD STATUS for DTC P0139 and/or P0159* in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for
poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM. If the screen
indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF
CONDITION, go to step 3 and recheck.

NOTE:



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



Information marked with an asterisk (*) applies to the front bank (Bank
2).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 39

6. Turn the ignition switch OFF.

7. Replace the secondary HO2S (Sensor 2) (see SECONDARY HO2S REPLACEMENT ).

8. Turn the ignition switch ON (II).

9. Reset the PCM with the HDS.

10. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

11. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

12. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 176°F (80°C)



Transmission in D position



Vehicle speed between 35-55 mph (56-88 km/h)



Drive 5 minutes or more

13. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0139 and/or P0159* indicated?

YES - Check for poor connections or loose terminals at the secondary HO2S (Sensor 2) and the PCM,
then go to step 1.

NO - Go to step 14.

14. Monitor the OBD STATUS for DTC P0139 and/or P01591 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 13,
go to the indicated DTCs troubleshooting

DTC P0141: REAR SECONDARY HO2S (BANK 1, SENSOR 2) HEATER CIRCUIT
MALFUNCTION; DTC P0161: FRONT SECONDARY HO2S (BANK 2, SENSOR 2) HEATER
CIRCUIT MALFUNCTION

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine.

4. Check for Temporary DTCs or DTCs with the HDS.

NOTE:



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



Information marked with an asterisk (*) applies to the front bank (Bank
2).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 40

Is DTC P0141 and/or P0161* 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), the A/F sensor relay (LAF), and the PCM

5. Turn the ignition switch OFF.

6. Check these fuses:



No. 19 OPTION (40A) fuse in under-hood fuse/relay box.



No. 4 A/F SENSOR (15A) fuse in under-dash fuse/relay box.



No. 23 IGP (7.5A) fuse in under-dash fuse/relay box.

Are any of the fuses blown?

YES - Repair short in the wire between the A/F sensors, the A/F sensor relay (LAF), and the fuses,
then replace the fuse(s), and go to step 22.

NO - Go to step 7.

7. Disconnect the secondary HO2S (Sensor 2) 4P connector.

8. Measure resistance between secondary HO2S (Sensor 2) 4P connector terminals No. 3 and No. 4.

Fig. 37: Measuring Resistance Between Secondary HO2S (Sensor 2) 4P Connector Terminals
No. 3 And No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 5.4-6.6 ohms at room temperature?

YES - Go to step 9.

NO - Go to step 21.

9. Check for continuity between body ground and secondary HO2S (Sensor 2) 4P connector terminals

No. 3 and No. 4 individually.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 41

Content .. 672 673 674 675 ..