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Acura RL. Manual - part 455

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

7. Turn the ignition switch ON (II).

8. Clear the DTC with the HDS.

9. Visually check the throttle valve operation.

Does the valve move to the fully closed position temporarily?

YES - Go to step 17.

NO - Go to step 10.

10. Turn the ignition switch OFF.

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

module subharness.

12. Check for continuity between C251 connector (13P) terminals No. 2 and No. 4.

Fig. 53: Checking Continuity Between C251 Connector (13P) Terminals No. 2 And No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 13.

NO - Go to step 15.

13. Disconnect the throttle body 6P connector.

14. Check for continuity between C251 connector (13P) terminals No. 2 and No. 4.

2007 Acura RL

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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Fig. 54: Checking Continuity Between C251 Connector (13P) Terminals No. 2 And No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the TPSA line and the TPSB line, then go to step 19.

NO - Go to step 17.

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

CONTROL MODULE REPLACEMENT ).

16. Check for continuity between C251 connector (13P) terminals No. 2 and No. 4.

Fig. 55: Checking Continuity Between C251 Connector (13P) Terminals No. 2 And No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the TPSA line and the TPSB line of the throttle actuator
control module subharness, then go to step 19.

NO - Go to step 24.

17. Turn the ignition switch OFF.

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

19. Reconnect all connectors.

20. Turn the ignition switch ON (II).

21. Reset the PCM with the HDS.

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

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

Is DTC P2135 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.

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2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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24. Reconnect all connectors.

25. 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 ).

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

Is DTC P2135 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 P2138: APP SENSOR A/B INCORRECT VOLTAGE CORRELATION

1. Turn the ignition switch ON (II).

2. Clear the DTC with the HDS.

3. Press the accelerator pedal to the floor.

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

Is DTC P2138 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals
at the APP sensor and the PCM.

5. Check APP SENSOR A and APP SENSOR B in the DATA LIST with the HDS.

Are they the same voltage?

YES - Go to step 6.

NO - Go to step 11.

6. Turn the ignition switch OFF.

7. Jump the SCS line with the HDS.

8. Disconnect the APP sensor 6P connector.

9. Disconnect PCM connector D(17P).

10. Check for continuity between PCM connector terminals D3 and D9.

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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Fig. 56: Checking Continuity Between PCM Connector Terminals D3 And D9
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wires between the PCM terminals (D3, D9), then go to step 13.

NO - Go to step 21.

11. Turn the ignition switch OFF.

12. Replace the accelerator pedal module (see ACCELERATOR PEDAL MODULE

REMOVAL/INSTALLATION ).

13. Reconnect all connectors.

14. Turn the ignition switch ON (II).

15. Reset the PCM with the HDS.

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

17. Turn the ignition switch OFF.

18. Turn the ignition switch ON (II).

19. Press the accelerator pedal to the floor.

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

Is DTC P2138 indicated?

YES - Check for poor connections or loose terminals at the APP sensor 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.

21. Reconnect all connectors.

22. 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 ).

23. Turn the ignition switch OFF.

24. Turn the ignition switch ON (II).

25. Press the accelerator pedal to the floor.

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

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2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

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