Acura TSX / Honda Accord CL. Manual - part 587

13. Turn the ignition switch OFF.  

14. Replace the IAT sensor (see IAT SENSOR REPLACEMENT ).  

15. Turn the ignition switch ON (II).  

16. Reset the ECM/PCM with the HDS.  

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

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT 
sensor 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: Troubleshooting is complete.  

19. 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 ).  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0113 is indicated, check for poor connections or loose terminals at the IAT 
sensor 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 P0116: ECT SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM 

1. Turn the ignition switch ON (II).  

2. Check the ECT SENSOR in the DATA LIST with the HDS. 

Is about 176°F (80°C) or higher, or 0.86 V or less indicated? 

YES: Go to step 3.  

NO: Go to step 7 .  

3. Note the current coolant temperature from step 2.  

4. Turn the ignition switch OFF.  

5. Let the engine cool for 1 hour.  

6. Check the ECT SENSOR in the DATA LIST with the HDS. 

Did the ECT change 3.6°F (2°C) or more? 

YES: Intermittent failure, system is OK at this time. Check the thermostat and the cooling 
system.  

NO: Go to step 10 .  

7. Note the current coolant temperature.  

8. Start the engine. Hold the engine speed at 3,000 RPM with no load (in Park or neutral) until the radiator 

fan comes on, then let it idle.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

9. Check the ECT SENSOR in the DATA LIST with the HDS. 

Does the ECT change 3.6°F (2°C) or more? 

YES: Intermittent failure, system is OK at this time. Check the thermostat and the cooling 
system.  

NO: Go to step 10.  

10. Turn the ignition switch OFF.  

11. Replace the ECT sensor (see ECT SENSOR REPLACEMENT ).  

12. Turn the ignition switch ON (II).  

13. Reset the ECM/PCM with the HDS.  

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

15. Allow the engine to cool to between 23°F (-5°C) and 77°F (25°C).  

16. Start the engine, and let it idle for 20 minutes.  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0116 is indicated, check for poor connections or loose terminals at the ECT 
sensor 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: Go to step 18.  

18. Monitor the OBD STATUS for DTC P0116 in the DTCs MENU with the HDS. 

Does the screen indicates PASSED? 

YES: Troubleshooting is complete.  

NO: If the screen indicates FAILED, check for poor connections or loose terminals at the 
ECT sensor and the ECM/PCM, then go to step 1 . If the screen indicates NOT 
COMPLETED, go to step 15 and recheck.  

DTC P0117: ECT SENSOR CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check the ECT SENSOR in the DATA LIST with the HDS. 

Is about 356°F (180°C) or higher, or 0.08 V or less indicated? 

YES: Go to step 3.  

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

3. Turn the ignition switch OFF.  

4. Disconnect the ECT sensor 2P connector.  

5. Turn the ignition switch ON (II).  

6. Check the ECT SENSOR in the DATA LIST with the HDS. 

Is about 356°F (180°C) or higher, or 0.08 V or less indicated? 

YES: Go to step 7.  

NO: Go to step 11 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

7. Turn the ignition switch OFF.  

8. Jump the SCS line with the HDS.  

9. Disconnect ECM/PCM connector B (24P).  

10. Check for continuity between ECT sensor 2P connector terminal No. 1 and body ground. 

Is there continuity? 

YES: Repair short in the wire between the ECT sensor and ECM/PCM (B8), then go to step 
13 .  

NO: Go to step 17 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 14: Checking For Continuity Between ECT Sensor 2P Connector Terminal No. 1 & Body 
Ground 

11. Turn the ignition switch OFF.  

12. Replace the ECT sensor (see ECT SENSOR REPLACEMENT ).  

13. Turn the ignition switch ON (II).  

14. Reset the ECM/PCM with the HDS.  

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

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

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX