Acura RL. Manual - part 447

Fig. 12: Checking Continuity Between Throttle Actuator Control Module 16P Connector 
Terminal 10 And C251 (13P) Terminal 4 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 26. 

NO - Repair open in the wire between the throttle actuator control module and the C251 connector 
(TPSA line), then go to step 21. 

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 terminal No. 4 to body ground with a jumper wire. 

Fig. 13: Connecting Throttle Body 6P Connector Terminal No. 4 To Body Ground With Jumper 
Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

16. Check for continuity between C251 connector (13P) terminal No. 5 and body ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

me 

 

Friday, June 05, 2009 2:29:49 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 14: Checking Continuity Between C251 Connector (13P) Terminal No. 5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 18. 

NO - Repair open in the wire between the throttle body and the C251 connector (SG line), then go to 
step 21. 

17. Disconnect the throttle actuator control module 16P connector (see THROTTLE ACTUATOR 

CONTROL MODULE REPLACEMENT ).  

18. Check for continuity between throttle actuator control module 16P connector terminal No. 9 and C251 

connector (13P) terminal No. 5. 

Fig. 15: Checking Continuity Between Throttle Actuator Control Module 16P Connector 
Terminal 9 And C251 (13P) Terminal 5 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 26. 

NO - Repair open in the wire between the throttle actuator control module (SG line) and the C251 
connector, then go to step 21. 

19. Turn the ignition switch OFF.  

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

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

me 

 

Friday, June 05, 2009 2:29:49 PM

Page 10 

© 2005 Mitchell Repair Information Company, LLC. 

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. Check for Temporary DTCs or DTCs with the HDS. 

Is DTC P0123 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. 

26. Reconnect all connectors.  

27. 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 ).  

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

Is DTC P0123 indicated?  

YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator 
control module. 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 P0222: TP SENSOR B CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

3. Check TP SENSOR A in the DATA LIST with the HDS. 

Is there about 0.3 V or less?  

YES - Go to step 4. 

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. 

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 ).

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

me 

 

Friday, June 05, 2009 2:29:49 PM

Page 11 

© 2005 Mitchell Repair Information Company, LLC. 

Are DTC P0122 and P0222 indicated at the same time?

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 21. If the connections and terminals are OK, go 
to step 11. 

NO - Go to step 5. 

5. Turn the ignition switch OFF.  

6. Disconnect the throttle body 6P connector.  

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

module subharness.  

8. Check for continuity between throttle body 6P connector terminal No. 3 and body ground. 

Fig. 16: Checking Continuity Between Throttle Body 6P Connector Terminal No. 3 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between the throttle body and the C251 connector (TPSB line), then go 
to step 21. 

NO - Go to step 9. 

9. Disconnect the throttle actuator control module 16P connector.  

10. Check for continuity between C251 connector (13P) terminal No. 2 and body ground. 

Fig. 17: Checking Continuity Between C251 Connector (13P) Terminal No. 2 And Body Ground

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

me 

 

Friday, June 05, 2009 2:29:49 PM

Page 12 

© 2005 Mitchell Repair Information Company, LLC.