Acura RL. Manual - part 691

7. Disconnect PCM connector E (31P).  

8. Check for continuity between PCM connector terminal E21 and body ground. 

Fig. 88: Checking Continuity Between PCM Connector Terminal E21 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Repair short in the wire between the PCM (E21) and starter relay 1 or starter relay 2, then go to 
step 9. 

NO - Go to step 14. 

9. Reconnect all connectors.  

10. Turn the ignition switch ON (II).  

11. Reset the PCM with the HDS.  

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

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

Is DTC P16BF indicated?  

YES - Check for poor connections or loose terminals at starter relay 1, starter relay 2, 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 

14. Reconnect all connectors.  

15. 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 ).  

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

Is DTC P16BF indicated?  

YES - Check for poor connections or loose terminals at starter relay 1, starter relay 2, and the PCM. If 
the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then 
recheck. If the PCM was substitute, go to step 1.

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 106  © 2005 Mitchell Repair Information Company, LLC. 

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 

DTC P2183: ECT SENSOR 2 CIRCUIT RANGE/PERFORMANCE PROBLEM 

1. Check for poor connections or loose terminals at ECT sensor 1 and ECT sensor 2. 

Are the connections and terminals OK?  

YES - Go to step 2. 

NO - Repair the connectors or terminals, then go to step 27. 

2. Turn the ignition switch ON (II).  

3. Check for Temporary DTC s or DTCs with the HDS. 

Are DTC P1116 and P2183 indicated at the same time?  

YES - Go to step 15. 

NO - Go to step 4. 

4. Start the engine, and let it idle 10 minutes.  

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

Is about 131°F (55°C) or less, or 1.50 V or more indicated?  

YES - Replace ECT sensor 2 (see ECT SENSOR 2 REPLACEMENT ), then go to step 27. 

NO - Go to step 6. 

6. Turn the ignition switch OFF.  

7. Drain the coolant (see COOLANT CHECK ).  

8. Remove ECT sensor 2 (see ECT SENSOR 2 REPLACEMENT ).  

9. Allow ECT sensor 2 to cool to 77°F (25°C).  

10. Note the ambient temperature.  

11. Connect ECT sensor 2 to its 2P connector, but do not install it onto the engine.  

12. Turn the ignition switch ON (II).  

13. Note the value of ECT SENSOR 2 quickly in the DATA LIST with the HDS.  

14. Compare the value of ECT SENSOR 2 and the outside temperature. 

NOTE:



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



If DTC P0111 is stored at the same time as DTC P2183, troubleshoot 
DTC P0111 first, then recheck for DTC P2183.  

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 107  © 2005 Mitchell Repair Information Company, LLC. 

Does ECT SENSOR 2 differ 5.4°F (3°C) or more?

YES - Replace ECT sensor 2 (see ECT SENSOR 2 REPLACEMENT ), then go to step 27. 

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals 
at ECT sensor 1, ECT sensor 2, and the PCM 

15. Start the engine, and let it idle 10 minutes.  

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

Is about 118°F (48°C) or less, or 1.75 V or more indicated?  

YES - Replace ECT sensor 1 (see ECT SENSOR 1 REPLACEMENT ), then go to step 27. 

NO - Go to step 17. 

17. Let the engine idle 10 minutes.  

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

Is about 131°F (55°C) or less, or 1.50 V or more indicated?  

YES - Replace ECT sensor 2 (see ECT SENSOR 2 REPLACEMENT ), then go to step 27. 

NO - Go to step 19. 

19. Turn the ignition switch OFF.  

20. Drain the coolant (see COOLANT CHECK ).  

21. Remove ECT sensor 1 (see ECT SENSOR 1 REPLACEMENT ), and ECT sensor 2 (see ECT 

SENSOR 2 REPLACEMENT ).  

22. Allow the sensors to cool to ambient temperature.  

23. Note the ambient temperature.  

24. Connect ECT sensor 1 to its 2P connector, and ECT sensor 2 to its 2P connector, but do not install 

them on the engine.  

25. Note the value of ECT SENSOR 1 and ECT SENSOR 2 quickly in the DATA LIST with the HDS.  

26. Compare the value of ECT SENSOR 1 and the ambient temperature, and the value of ECT SENSOR 

2 and the ambient temperature individually. 

Does one of the sensor differ more than 5.4°F (3°C) from the ambient temperature?  

YES - Replace the sensor that differed more than 5.4°F (3°C) from the ambient temperature, then go 
to step 27. 

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals 
at ECT sensor 1, ECT sensor 2, and the PCM 

27. Turn the ignition switch ON (II).  

28. Reset the PCM with the HDS.  

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 108  © 2005 Mitchell Repair Information Company, LLC. 

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

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

Is DTC P2183 indicated?  

YES - Check for poor connections or loose terminals at ECT sensor 1, ECT sensor 2, 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 P2184: ECT SENSOR 2 CIRCUIT LOW VOLTAGE 

1. Turn the ignition switch ON (II).  

2. Check ECT SENSOR 2 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 2 and the PCM 

3. Turn the ignition switch OFF.  

4. Disconnect ECT sensor 2 2P connector.  

5. Turn the ignition switch ON (II).  

6. Check ECT SENSOR 2 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 B (24P).  

10. Check for continuity between ECT sensor 2 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

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 109  © 2005 Mitchell Repair Information Company, LLC.