Acura RL. Manual - part 457

Fig. 60: Identifying Throttle Actuator Control Module Relay 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

7. Disconnect PCM connector E (31P).  

8. Check for continuity between PCM connector terminal E3 and body ground. 

Fig. 61: Checking Continuity Between PCM Connector Terminal E3 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between the throttle actuator control module relay and the PCM (E3), 
then go to step 10. 

NO - Go to step 9. 

9. Test the throttle actuator control module relay (see POWER RELAY TEST ). 

Is the relay OK?  

YES - Go to step 17. 

NO - Replace the throttle actuator control module relay, then go to step 10. 

10. Reconnect PCM connector E (31P).  

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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11. Turn the ignition switch ON (II).  

12. Reset the PCM with the HDS.  

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

14. Turn the ignition switch OFF.  

15. Turn the ignition switch ON (II), and wait 10 seconds.  

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

Is DTC P2552 indicated?  

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

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

17. Reconnect all connectors.  

18. 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 ).  

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

Is DTC P2552 indicated?  

YES - Check for poor connections or loose terminals at the throttle actuator control module, the 
throttle actuator control module relay, and the PCM. If the PCM was updated, substitute a known-
good PCM (see 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 ). If any other Temporary DTCs or DTCs are indicated, 
go to the indicated DTCs troubleshooting. 

DTC U0107: LOST COMMUNICATION WITH THROTTLE ACTUATOR CONTROL MODULE 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

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

Is DTC U0107 indicated?  

YES - Check for, and repair any poor connections or loose terminals at the throttle body, the throttle 
actuator control module, and the PCM, then go to step 62. If the connections and terminals are OK, go 
to step 6. 

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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NO - Go to step 4. 

4. Start the engine.  

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

Is DTC U0107 indicated?  

YES - Go to step 48. 

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals 
at the throttle body, the throttle actuator control module relay, the throttle actuator control module, 
and the PCM. 

6. Clear the DTC with the HDS.  

7. Turn the ignition switch OFF.  

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

9. Press the accelerator pedal to the floor.  

10. Turn the ignition switch ON (II).  

11. Check the throttle valve operation. 

Does the throttle valve open after it closes?  

YES - Go to step 12. 

NO - Go to step 13. 

12. Check the throttle valve again. 

Does the throttle valve open fully?  

YES - Go to step 42. 

NO - Go to step 36. 

13. Turn the ignition switch OFF.  

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

module subharness.  

15. Check for continuity between C251 connector (13P) terminal No. 7 and body ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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Fig. 62: Checking Continuity Between C251 Connector (13P) Terminal No. 7 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 16. 

NO - Repair open in the wire between the C251 connector and G101, then go to step 63. 

16. Remove the throttle actuator control module relay (A). 

Fig. 63: Identifying Throttle Actuator Control Module Relay 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

17. Measure voltage between throttle actuator control module relay 4P connector terminal No. 4 and body 

ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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© 2005 Mitchell Repair Information Company, LLC.