Acura RL. Manual - part 670

NO - Go to step 17.

17. Monitor the OBD STATUS for DTC P0125 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 16,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step
15.

DTC P0128: COOLING SYSTEM MALFUNCTION

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Turn the blower switch OFF.

4. Turn the A/C switch OFF.

5. Check the FAN CTRL in the DATA LIST with the HDS.

Is it OFF?

YES - Go to step 6.

NO - Wait until the FAN CTRL is off, then go to step 6.

6. Check the radiator fan operation.

Does the radiator fan keep running?

YES - Check the cooling system (see RADIATOR CAP TEST ). If the cooling system is OK, go to
step 20.

NO - Go to step 7.

7. Let the engine cool until the coolant temperature is 104°F(40°C) or less.

8. Note the value of ECT SENSOR 1 and ECT SENSOR 2 in the DATA LIST with the HDS.

9. Start the engine, and let it idle.

10. Let the engine idle until ECT SENSOR 1 goes up 49°F (27°C) or more from the recorded

temperature.

11. Check ECT SENSOR 2 in the DATA LIST with the HDS.

12. Compare the recorded value of ECT SENSOR 2 and the present value of ECT SENSOR 2.

NOTE:

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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Page 22

Did temperature rise 17°F (9.5°C) or more?

YES - 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

NO - Test the thermostat (see FAN MOTOR TEST ), then go to step 13.

13. Turn the ignition switch ON (II).

14. Reset the PCM with the HDS.

15. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).

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

17. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.

18. Check for Temporary DTCs or 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.
then go to step 1.

NO - Go to step 19.

19. Monitor the OBD STATUS for DTC P0128 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 18,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at ECT sensor 1,
ECT sensor 2, and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step
17.

20. 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 ).

21. Let the engine cool until the coolant temperature is between 21°F (-6°C) and 104°F (40°C).

22. 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.

23. Test-drive at a steady speed between 15-75 mph (24-120 km/h) for 10 minutes.

24. Check for Temporary DTCs or 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 ), then go
to step 21. If the PCM was substituted, go to step 1.

NO - Go to step 25.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Page 23

25. Monitor the OBD STATUS for DTC P0128 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 24, go to the indicated DTCs troubleshooting

NO - If the screen 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 ), then go to step 21. If the PCM was substituted, go to step 1. If the
screen indicates NOT COMPLETED, go to step 21.

DTC P0133: REAR A/F SENSOR (BANK 1, SENSOR 1) CIRCUIT SLOW RESPONSE; DTC
P0153: FRONT A/F SENSOR (BANK 2, SENSOR 1) 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



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 and/or P01531 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 6.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for
poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the screen indicates
EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go
to step 3 and recheck.

6. Turn the ignition switch OFF.

7. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).

NOTE:



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



If DTC P0139 and/or P0159* is stored at the same time as DTC P0133
and/or P0153*, troubleshoot DTC P0139 and/or P0159* first, then
recheck for DTC P0133 and/or P0153*.



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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

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

Page 24

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



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 Temporary DTCs or DTCs with the HDS.

Is DTC P0133 and/or P0153* indicated?

YES - Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM, then
go to step 1.

NO - Go to step 14.

14. Monitor the OBD STATUS for DTC P0133 and/or P0153* in the DTCs MENU with the HDS.

Does the 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

NO - If the screen 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 screen indicates EXECUTING, keep driving until a
result comes on. If the screen indicates OUT OF CONDITION, go to step 12.

DTC P0134: REAR A/F SENSOR (BANK 1, SENSOR 1) HEATER SYSTEM MALFUNCTION;
DTC P0154: FRONT A/F SENSOR (BANK 2, SENSOR 1) HEATER SYSTEM MALFUNCTION

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, and let it idle without load (in Park or neutral) until the radiator fan comes on.

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 ).



If DTC P2251 and/or P2254* is stored at the same time as DTC P0134
and/or P0154*, troubleshoot DTC P2251 and/or P2254* first, then
recheck for P0134 and/or P01541.



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

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