Acura RL. Manual - part 450

10. Release the throttle valve. 

Does the throttle valve return?  

YES - Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step 13. 

NO - Go to step 11. 

11. Turn the ignition switch OFF.  

12. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).  

13. Turn the ignition switch ON (II).  

14. Reset the PCM with the HDS.  

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

16. Turn the ignition switch OFF, and wait 10 seconds.  

17. Turn the ignition switch ON (II).  

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

Is DTC P1683 indicated?  

YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator 
control module, then go to step 1. 

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the 
indicated DTCs troubleshooting. 

DTC P1684: THROTTLE VALVE RETURN SPRING PERFORMANCE PROBLEM 

Fig. 29: Pushing Throttle Valve Closed 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

CAUTION: Do not insert your fingers into the installed throttle body when you turn 

the ignition switch ON (II) or while the ignition switch is ON (II). If you 
do, you will seriously injure your fingers if the throttle valve is 
activated.

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

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. Turn the ignition switch OFF, and wait 10 seconds.  

5. Turn the ignition switch ON (II).  

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

Is DTC P1684 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 throttle body and the throttle actuator control module. 

7. Turn the ignition switch OFF.  

8. Disconnect the intake air duct from the throttle body.  

9. Push the throttle valve open as shown. 

10. Release the throttle valve. 

Does the throttle valve return?  

YES - Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step 13. 

NO - Go to step 11. 

and review the general troubleshooting information (see GENERAL 
TROUBLESHOOTING INFORMATION ).

NOTE:



Do not operate the ignition switch during the check.  



Be careful not to pinch your fingers during the check. 

Fig. 30: Pushing Throttle Valve Open 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

11. Turn the ignition switch OFF.  

12. Replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ).  

13. Turn the ignition switch ON (II).  

14. Reset the PCM with the HDS.  

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

16. Turn the ignition switch OFF, and wait 10 seconds.  

17. Turn the ignition switch ON (II).  

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

Is DTC P1684 indicated?  

YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator 
control module, then go to step 1. 

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the 
indicated DTCs troubleshooting. 

DTC P2101: THROTTLE ACTUATOR SYSTEM MALFUNCTION 

1. Clear the DTC with the HDS.  

2. Do the ETCS TEST in the INSPECTION MENU with the HDS.  

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

Is DTC P2101 indicated?  

YES - Go to step 6. 

NO - Go to step 4. 

4. Test-drive the vehicle for several minutes in the range of these recorded freeze data parameters: 



ENGINE SPEED  



VSS  



APP SENSOR  

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

Is DTC P2101 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 throttle body and the throttle actuator control module, then clean the throttle body (see 
THROTTLE BODY CLEANING ).

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 Electronic Throttle Control System - RL

  

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Friday, June 05, 2009 2:29:49 PM

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© 2005 Mitchell Repair Information Company, LLC. 

6. Turn the ignition switch OFF.  

7. Disconnect the intake air duct from the throttle body.  

8. Turn the ignition switch ON (II).  

9. Clear the DTC with the HDS.  

10. Do the ETCS TEST in the INSPECTION MENU with the HDS.  

11. Visually check the throttle valve operation, 

Does the throttle valve operate smoothly?  

YES - Clean the throttle body (see THROTTLE BODY CLEANING ), then go to step 21 and 
recheck. If DTC P2101 is indicated, go to step 19. 

NO - Go to step 12. 

12. Turn the ignition switch OFF.  

13. Disconnect the throttle body 6P connector.  

14. Disconnect the C251 connector (13P) between the PCM subharness and the throttle actuator control 

module subharness.  

15. Connect throttle body 6P connector terminals No. 5 and No. 6 with a jumper wire. 

Fig. 31: Connecting Throttle Body 6P Connector Terminals No. 5 And No. 6 With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

16. Check for continuity between C251 connector (13P) terminals No. 6 and No. 13. 

NOTE:

Be careful not to pinch your fingers during the check.

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

me 

 

Friday, June 05, 2009 2:29:49 PM

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© 2005 Mitchell Repair Information Company, LLC.