Acura RL. Manual - part 451

Fig. 32: Checking Continuity Between C251 Connector (13P) Terminals No. 6 And No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 17.

NO - Repair open in the wire between the throttle body and the C251 connector (motor drive lines),
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 terminals No. 1 and No.

8 and C251 connector (13P) terminals No. 6 and No. 13 individually.

Fig. 33: Checking Continuity Between Throttle Actuator Control Module 16P Connector
Terminals 1 And 8 And C251 (13P) Terminals 6 And 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 27.

NO - Repair open in the wires between the throttle actuator control module and the C251 connector
(motor drive lines), then go to step 21.

19. Turn the ignition switch OFF.

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

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. Test-drive the vehicle for several minutes in the range of the recorded freeze data.

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

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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Is DTC P2101 indicated?

YES - 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 ), and go to step
1.

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

27. Reconnect all connectors.

28. 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 ).

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

Is DTC P2101 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 P2108: THROTTLE ACTUATOR CONTROL MODULE PROBLEM

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch OFF.

4. Turn the ignition switch ON (II).

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

Is DTC P2108 indicated?

YES - Substitute a known-good throttle actuator control module (see THROTTLE ACTUATOR
CONTROL MODULE REPLACEMENT ), and recheck. If DTC P2108 is not indicated, replace
the original throttle actuator control module (see THROTTLE ACTUATOR CONTROL
MODULE REPLACEMENT ).

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, and the PCM.

DTC P2118: THROTTLE ACTUATOR CURRENT RANGE/PERFORMANCE PROBLEM

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

Friday, June 05, 2009 2:29:49 PM

Page 26

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

module subharness.

2. Measure resistance between C251 connector (13P) terminals No. 6 and No. 13.

Fig. 34: Measuring Resistance Between C251 Connector (13P) Terminals No. 6 And No. 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1.0 or less?

YES - Go to step 3.

NO - Go to step 5.

3. Disconnect the throttle body 6P connector.

4. Measure resistance between throttle body 6P connector terminals No. 5 and No. 6 with the throttle

fully closed.

Fig. 35: Measuring Resistance Between Throttle Body 6P Connector Terminals No. 5 And No. 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 1.0 or less?

YES - Go to step 7.

NO - Repair short in the wires between the throttle body and the C251 connector (motor drive lines),

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

Friday, June 05, 2009 2:29:49 PM

Page 27

then go to step 8.

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

CONTROL MODULE REPLACEMENT ).

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

individually.

Fig. 36: Checking Continuity Between Body Ground And C251 Connector (13P) Terminals 6
And 13
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wires between the throttle actuator control module and the C251 connector
(motor drive lines), then go to step 8.

NO - Go to step 16.

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

8. Reconnect all connectors.

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. Turn the ignition switch OFF.

13. Turn the ignition switch ON (II).

14. Slowly press the accelerator pedal to the floor.

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

Is DTC P2118 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.

16. Reconnect all connectors.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

Friday, June 05, 2009 2:29:49 PM

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