Acura RL. Manual - part 453

original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, 
go to the indicated DTCs troubleshooting. 

DTC P2123: APP SENSOR A (THROTTLE POSITION SENSOR D) CIRCUIT HIGH VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check APP SENSOR A in the DATA LIST with the HDS. 

Is there about 4.9 V or more?  

YES - Go to step 3. 

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

3. Turn the ignition switch OFF.  

4. Disconnect the APP sensor 6P connector.  

5. Turn the ignition switch ON (II).  

6. Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3. 

Fig. 43: Measuring Voltage Between APP Sensor 6P Connector Terminals No. 2 And No. 3 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES - Go to step 8. 

NO - Go to step 7. 

7. Measure voltage between PCM connector terminals D2 and D7. 

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. 44: Measuring Voltage Between PCM Connector Terminals D2 And D7 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES - Repair short in the wire between the PCM (D7) and APP sensor A, then go to step 10. 

NO - Go to step 14. 

8. Turn the ignition switch OFF.  

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

REMOVAL/INSTALLATION ).  

10. Turn the ignition switch ON (II).  

11. Reset the PCM with the HDS.  

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

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

Is DTC P2123 indicated?  

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

14. Turn the ignition switch OFF.  

15. Reconnect all connectors.  

16. 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 ).  

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

Is DTC P2123 indicated?  

YES - Check for poor connections or loose terminals at APP sensor A 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, 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Electronic Throttle Control System - RL

  

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© 2005 Mitchell Repair Information Company, LLC. 

go to the indicated DTCs troubleshooting.

DTC P2127: APP SENSOR B (THROTTLE POSITION SENSOR E) CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check APP SENSOR A in the DATA LIST with the HDS. 

Is there about 0.1 V or less?  

YES - Go to step 3. 

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

3. Turn the ignition switch OFF.  

4. Disconnect the APP sensor 6P connector.  

5. Turn the ignition switch ON (II).  

6. Measure voltage between APP sensor 6P connector terminals No. 5 and No. 6. 

Fig. 45: Measuring Voltage Between APP Sensor 6P Connector Terminals No. 5 And No. 6 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES - Go to step 7. 

NO - Go to step 17. 

7. Turn the ignition switch OFF.  

8. Jump the SCS line with the HDS.  

9. Disconnect PCM connector D(17P).  

10. Check for continuity between APP sensor 6P connector terminal No. 4 and body ground. 

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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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 46: Checking Continuity Between APP Sensor 6P Connector Terminal No. 4 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between APP sensor B and the PCM (D9), then go to step 20. 

NO - Go to step 11. 

11. Connect PCM connector terminal D9 to body ground with a jumper wire. 

Fig. 47: Connecting PCM Connector Terminal D9 To Body Ground With A Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

12. Check for continuity between APP sensor 6P connector terminal No. 4 and body ground. 

Fig. 48: Checking Continuity Between APP Sensor 6P Connector Terminal No. 4 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

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.