Acura TSX / Honda Accord CL. Manual - part 525

Fig. 31: Measuring Voltage Between ECM/PCM Connector Terminals A21 And A24 

Is there about 5 V ? 

YES - Repair open in the wire between the ECM/PCM (A24) and APP sensor A, then go to step 10. 

NO - Go to step 14. 

8. Turn the ignition switch OFF.  

9. Replace the APP sensor (see THROTTLE ACTUATOR CONTROL MODULE REPLACEMENT ). 

10. Turn the ignition switch ON (II).  

11. Reset the ECM/PCM with the HDS.  

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

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

Are any Temporary DTCs or DTCs indicated? 

YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the 
ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated 
DTC troubleshooting. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

  

 

NO - Troubleshooting is complete. 

14. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM (see 

HOW TO SUBSTITUTE THE ECM/PCM ).  

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

Are any Temporary DTCs or DTCs indicated? 

YES - If DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the 
ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated 
DTC troubleshooting. 

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, 
replace the original ECM/PCM (see HOW TO REMOVE THE ECM/PCM FOR TESTING ). 

DTC P2127: APP SENSOR B CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check APP SENSOR-B in the DATA LIST with the HDS. 

Is there about 0.1 V, or less with the accelerator pedal fully pressed? 

YES - Go to step 3. 

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

3. Turn the ignition switch OFF.  

4. Disconnect the APP sensor 6P connector.  

5. Turn the ignition switch ON (II).  

6. At the wire harness side, measure voltage between APP sensor 6P connector terminals No. 1 and No. 2. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

  

 

Fig. 32: Measuring Voltage Between APP Sensor 6P Connector Terminals No. 1 And No. 2 

Is there about 5 V ? 

YES - Go to step 7. 

NO - Go to step 15. 

7. Turn the ignition switch OFF.  

8. At the sensor side, measure resistance between APP sensor 6P connector terminals No. 2 and No. 3 with 

the throttle fully closed. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX

  

 

Fig. 33: Measuring Resistance Between APP Sensor 6P Connector Terminals No. 2 And No. 3 

Is there about 0.35-0.45 kohm ? 

YES - Go to step 9. 

NO - Go to step 16. 

9. At the sensor side, measure resistance between APP sensor 6P connector terminals No. 1 and No. 3 with 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE Electronic Throttle Control System - TSX