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