Acura RL. Manual - part 668

Fig. 16: Measuring Voltage Between PCM Connector Terminal A5 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Repair open in the wire between the PCM (A5) and the IAT sensor, then go to step 20.

NO - Go to step 25.

18. Turn the ignition switch OFF.

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

20. Reconnect all connectors.

21. Turn the ignition switch ON (II).

22. Reset the PCM with the HDS.

23. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

24. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0113 indicated?

YES - Check for poor connections or loose terminals at the IAT sensor and the PCM, then go to step
1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the
indicated DTCs troubleshooting

25. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

26. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0113 indicated?

YES - Check for poor connections or loose terminals at the IAT sensor and the PCM. If the PCM was
updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the
PCM was substituted, go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the
original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated,
go to the indicated DTCs troubleshooting

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 14

DTC P0116: ECT SENSOR 1 CIRCUIT RANGE/PERFORMANCE PROBLEM

1. Turn the ignition switch ON (II).

2. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Is about 176°F (80°C) or higher, or 0.78 V or less indicated?

YES - Go to step 6.

NO - Go to step 3.

3. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.

4. Start the engine. Hold the engine speed at 3,000 RPM without load (in Park or neutral) until the

radiator fan comes on, then let it idle.

5. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Does ECT SENSOR 1 change 18°F (10°C) or more?

YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose
terminals at ECT sensor 1 and the PCM

NO - Go to step 11.

6. Note the value of ECT SENSOR 1 in the DATA LIST with the HDS.

7. Turn the ignition switch OFF.

8. Open the hood, and let the engine cool for 3 hours.

9. Turn the ignition switch ON (II).

10. Check ECT SENSOR 1 in the DATA LIST with the HDS.

Does ECT SENSOR 1 change 18°F (10°C) or more?

YES - Intermittent failure, the system is OK at this time. Check for poor connections or loose
terminals at ECT sensor 1 and the PCM

NO - Go to step 11.

11. Turn the ignition switch OFF.

12. Replace ECT sensor 1 (see ECT SENSOR 1 REPLACEMENT ).

13. Turn the ignition switch ON (II).

14. Reset the PCM with the HDS.

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

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

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot,
and review the general troubleshooting information (see GENERAL
TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 15

Is DTC P0116 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the
indicated DTCs troubleshooting

DTC P0117: ECT SENSOR 1 CIRCUIT LOW VOLTAGE

1. Turn the ignition switch ON (II).

2. Check ECT SENSOR 1 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, the system is OK at this time. Check for poor connections or loose terminals
at ECT sensor 1 and the PCM

3. Turn the ignition switch OFF.

4. Disconnect ECT sensor 1 2P connector.

5. Turn the ignition switch ON (II).

6. Check ECT SENSOR 1 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.

7. Turn the ignition switch OFF.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (31P).

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

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot,
and review the general troubleshooting information (see GENERAL
TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 16

Fig. 17: Checking Continuity Between ECT Sensor 1 2P Connector Terminal No. 1 And Body
Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between ECT sensor 1 and the PCM (A14), then go to step 13.

NO - Go to step 18.

11. Turn the ignition switch OFF.

12. Replace ECT sensor 1 (see ECT SENSOR 1 REPLACEMENT ).

13. Reconnect all connectors.

14. Turn the ignition switch ON (II).

15. Reset the PCM with the HDS.

16. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).

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

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the
indicated DTCs troubleshooting

18. Update the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a

known-good PCM (see SUBSTITUTING THE PCM ).

19. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0117 indicated?

YES - Check for poor connections or loose terminals at ECT sensor 1 and the PCM. If the PCM was
updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the
PCM was substituted, go to step 1.

DTC P0118: ECT SENSOR 1 CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).

2. Check ECT SENSOR 1 in the DATA LIST with the HDS.

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot,
and review the general troubleshooting information (see GENERAL
TROUBLESHOOTING INFORMATION ).

2007 Acura RL

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

Friday, June 05, 2009 2:34:58 PM

Page 17

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