Acura TSX / Honda Accord CL. Manual - part 614

Fig. 87: Measuring Voltage Between ECM Connector Terminal A18 & Body Ground 

11. Turn the ignition switch OFF.  

12. Jump the SCS line with the HDS.  

13. Disconnect ECM connector A (31P).  

14. Check for continuity between ECM connector terminal A 18 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM (A18) and the countershaft speed sensor, 
then go to step 17 .  

NO: Go to step 23 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 88: Checking For Continuity Between ECM Connector Terminal A 18 & Body Ground 

15. Turn the ignition switch OFF.  

16. Replace the countershaft speed sensor (see CKP SENSOR REPLACEMENT ), then go to step 16.  

17. Turn the ignition switch ON (II).  

18. Reset the ECM with the HDS.  

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

20. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C)  

z

Transmission in 5th gear  

z

Engine speed at 2,000-3,000 RPM 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

z

Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0720 is indicated, check for poor connections or loose terminals at the output 
shaft speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or DTCs 
are indicated, go to the indicated DTC troubleshooting.  

NO: Go to step 22.  

22. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED? 

YES: Troubleshooting is complete.  

NO: If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT 
COMPLETED, go to step 20 and recheck.  

23. Update the ECM if it does not have the latest software, or substitute a known-good ECM (see HOW TO 

SUBSTITUTE THE ECM/PCM ).  

24. Test-drive under the following conditions: 

z

Engine coolant temperature more than 158°F (70°C)  

z

Transmission in 5th gear  

z

Engine speed at 2,000-3,000 RPM  

z

Drive for several minutes, then decelerate (with the throttle fully closed) for 8 seconds  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0720 is indicated, check for poor connections or loose terminals at the 
countershaft speed sensor and the ECM, then go to step 1 . If any other Temporary DTCs or 
DTCs are indicated, go to the indicated DTC troubleshooting.  

NO: If the ECM was updated, troubleshooting is complete. If the ECM was substituted, 
replace the original ECM (see HOW TO SUBSTITUTE THE ECM/PCM ).  

DTC P1297: ELD CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check the ELD in the DATA LIST with the HDS. 

Is 72A or more indicated? 

YES: Go to step 3.  

NO: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the ELD and the ECM/PCM.  

3. Turn the ignition switch OFF.  

4. Disconnect the ELD 3P connector.  

5. Turn the ignition switch ON (II).  

6. Check the ELD in the DATA LIST with the HDS. 

Is 72A or more indicated? 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

YES: Go to step 7.  

NO: Go to step 11 .  

7. Turn the ignition switch OFF.  

8. Jump the SCS line with the HDS.  

9. Disconnect ECM/PCM connector E (31P).  

10. Check for continuity between ECM/PCM connector terminal E15 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECM/PCM (E15) and the ELD, then go to step 
13 .  

NO: Go to step 19 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX