Acura TSX / Honda Accord CL. Manual - part 588

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0117 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: Troubleshooting is complete.  

17. 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 ).  

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

Are any Temporary DTCs or DTCs indicated? 

YES: If DTC P0117 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: 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 P0118: ECT SENSOR CIRCUIT HIGH VOLTAGE 

1. Turn the ignition switch ON (II).  

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

Is about -40°F (-40°C) or less, or 4.90 V or higher 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. Connect ECT sensor 2P connector terminals No. 1 and No. 2 with a jumper wire. 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 15: Connecting ECT Sensor 2P Connector Terminals No. 1 & No. 2 With A Jumper Wire 

6. Turn the ignition switch ON (II).  

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

Is about -40°F (-40°C) or less, or 4.90 V or higher indicated? 

YES: Go to step 8.  

NO: Go to step 13 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

8. Turn the ignition switch OFF.  

9. Remove the jumper wire.  

10. Turn the ignition switch ON (II).  

11. Measure voltage between ECT sensor 2P connector terminal No. 1 and body ground. 

Is there about 5 V? 

YES: Repair open in the wire between the ECM/PCM (A23) and the ECT sensor, then go to 
step 15 .  

NO: Go to step 12.  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX

  

 

Fig. 16: Measuring Voltage Between ECT Sensor 2P Connector Terminal No. 1 & Body 
Ground 

12. Measure voltage between ECM/PCM connector terminal B8 and body ground. 

Is there about 5 V? 

YES: Repair open in the wire between the ECM/PCM (B8) and the ECT sensor, then go to 
step 15 .  

NO: Go to step 19 .  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE PGM-FI System - TSX