Content .. 685 686 687 688 ..

Acura RL. Manual - part 687

Is there less than 54.1 kPa (16.0 in.Hg, 406 mmHg) or 1.61 V held for more than 5 seconds?

YES - Go to step 6.

NO - Go to step 3.

3. Clear the DTC with the HDS.

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

radiator fan comes on, then let it idle.

5. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)



Engine speed between 1,400 and 6,500 RPM



Transmission in D position



Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle

6. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 7.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for
poor connections or loose terminals at the MAP sensor and the PCM. If the screen indicates NOT
COMPLETED, go to step 4 and recheck.

7. Turn the ignition switch OFF.

8. Replace the MAP sensor (see MAP SENSOR REPLACEMENT ).

9. Turn the ignition switch ON (II).

10. Reset the PCM with the HDS.

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

12. 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.

13. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)



Engine speed between 1,400 and 6,500 RPM



Transmission in D position



Vehicle speed accelerated from 16-31 mph (25-50 km/h) under half throttle

14. Check for Temporary DTCs or 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 15.

15. Monitor the OBD STATUS for DTC P1128 in the DTCs MENU with the HDS.

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

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Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 14,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP
sensor and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 13.

DTC P1129: MAP SENSOR SIGNAL HIGHER THAN EXPECTED

1. Check for vacuum leaks in these parts:



PCV valve



PCV hose



EVAP canister purge valve



Throttle body



Intake manifold



Brake booster



Brake booster hose

Are there any vacuum leaks?

YES - Repair or replace parts with vacuum leaks, then go to step 9.

NO - Go to step 2.

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

radiator fan comes on, then let it idle.

3. Check the MAP SENSOR in the DATA LIST with the HDS.

Is there more than 36.9 kPa (11.0 in.Hg, 277 mmHg) or 1.14 V held for more than 5 seconds?

YES - Go to step 7.

NO - Go to step 4.

4. Clear the DTC with the HDS.

5. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)



Engine speed between 1,400 and 6,500 RPM



Transmission in D position



Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at
least 5 seconds

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 2:34:59 PM

Page 91

6. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 7.

7. Turn the ignition switch OFF.

8. Replace the MAP sensor (see MAP SENSOR REPLACEMENT ).

9. Turn the ignition switch ON (II).

10. Reset the PCM with the HDS.

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

12. 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.

13. Test-drive under these conditions:



Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)



Engine speed between 1,400 and 6,500 RPM



Transmission in D position



Vehicle speed decelerated from more than 50 mph (80 km/h) with the throttle fully closed for at
least 5 seconds

14. Check for Temporary DTCs or 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 15.

15. Monitor the OBD STATUS for DTC P1129 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 14,
go to the indicated DTCs troubleshooting

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the MAP
sensor and the PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 13.

DTC P1172: REAR A/F SENSOR (BANK 1, SENSOR 1) CIRCUIT OUT OF RANGE HIGH; DTC
P1174: FRONT A/F SENSOR (BANK 2, SENSOR 1) CIRCUIT OUT OF RANGE HIGH

NOTE:



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

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:59 PM

Page 92

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. Monitor the OBD STATUS for P1172 and/or P1174* in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 5.

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

5. Turn the ignition switch OFF.

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

7. Turn the ignition switch ON (II).

8. Reset the PCM with the HDS.

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

10. 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.

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

Is DTC P1172 and/or P1174* indicated?

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

NO - Go to step 12.

12. Monitor the OBD STATUS for DTC P1172 and/or P1174* in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 11,
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 or OUT OF
CONDITION, keep idling until a result comes on.

DTC P1297: ELD CIRCUIT LOW VOLTAGE

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 2:34:59 PM

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Content .. 685 686 687 688 ..