Acura RL. Manual - part 692

Fig. 89: Checking Continuity Between ECT Sensor 2 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 2 and the PCM (B24), then go to step 13. 

NO - Go to step 18. 

11. Turn the ignition switch OFF.  

12. Replace ECT sensor 2 (see ECT SENSOR 2 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 P2184 indicated?  

YES - Check for poor connections or loose terminals at 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 

18. Reconnect all connectors.  

19. 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 ).  

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

Is DTC P2184 indicated?  

YES - Check for poor connections or loose terminals at ECT sensor 2 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

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 110  © 2005 Mitchell Repair Information Company, LLC. 

DTC P2185: ECT SENSOR 2 CIRCUIT HIGH VOLTAGE

1. Turn the ignition switch ON (II).  

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

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

Fig. 90: Connecting ECT Sensor 2 2P Connector Terminals No. 1 And 2 With Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

6. Turn the ignition switch ON (II).  

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

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

YES - Go to step 8. 

NO - Go to step 18. 

8. Turn the ignition switch OFF.  

9. Remove the jumper wire from ECT sensor 2 2P connector.  

10. Turn the ignition switch ON (II).  

11. Measure voltage 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 111  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 91: Measuring Voltage Between ECT Sensor 2 2P Connector Terminal No. 1 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES - Go to step 12. 

NO - Go to step 17. 

12. Turn the ignition switch OFF.  

13. Jump the SCS line with the HDS.  

14. Disconnect PCM connector C (22P).  

15. Connect ECT sensor 2 2P connector terminal No. 2 to body ground with a jumper wire. 

Fig. 92: Connecting ECT Sensor 2 2P Connector Terminal No. 2 To Body Ground With Jumper 
Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

16. Check for continuity between PCM connector terminal C12 and body ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 112  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 93: Checking Continuity Between PCM Connector Terminal C12 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Go to step 25. 

NO - Repair open in the wire between the PCM (C12) and ECT sensor 2, then go to step 20. 

17. Measure voltage between PCM connector terminal B24 and body ground. 

Fig. 94: Measuring Voltage Between PCM Connector Terminal B24 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES - Repair open in the wire between the PCM (B24) and ECT sensor 2, then go to step 20. 

NO - Go to step 25. 

18. Turn the ignition switch OFF.  

19. Replace ECT sensor 2 (see ECT SENSOR 2 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. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE PGM-FI System - RL

  

me 

 

Friday, June 05, 2009 2:34:59 PM

Page 113  © 2005 Mitchell Repair Information Company, LLC.