Acura RL. Manual - part 593

26. Turn the ignition switch ON (II).  

27. Reset the PCM with the HDS.  

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

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

Is DTC P1077 indicated?  

YES -Check for poor connections or loose terminals at the IMT actuator 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 -Go to step 30. 

30. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED?  

YES -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 were indicated 
in step 29, go to the indicated DTCs troubleshooting. 

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the IMT 
actuator 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. If the screen 
indicates NOT COMPLETED, keep idling until a result comes on. 

31. Turn the ignition switch OFF.  

32. Reconnect all connectors.  

33. 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 ).  

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

Is DTC P1077 indicated?  

YES -Check for poor connections or loose terminals at the IMT actuator 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 -Go to step 35. 

35. Monitor the OBD STATUS for DTC P1077 in the DTCs MENU with the HDS. 

Does the screen indicate PASSED?  

YES -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 were indicated 
in step 34, go to the indicated DTCs troubleshooting.

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Intake Air System - RL

  

me 

 

Friday, June 05, 2009 2:36:38 PM

Page 6 

© 2005 Mitchell Repair Information Company, LLC. 

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the IMT 
actuator 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. If the screen 
indicates NOT COMPLETED, keep idling until a result comes on. 

DTC P1078: IMT VALVE STUCK IN LOW RPM POSITION 

1. Turn the ignition switch ON (II).  

2. Clear the DTC with the HDS.  

3. Start the engine. Hold the engine speed above 4,000 RPM.  

4. Make sure the IMT VALVE CMD is OPEN in the DATA LIST with the HDS.  

5. Check the IMT VALVE SW in the DATA LIST with the HDS. 

Is CLOSED indicated?  

YES -Go to step 6. 

NO -Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals 
at the IMT actuator and the PCM. 

6. Let the engine idle, then turn the ignition switch OFF.  

7. Disconnect the IMT actuator 5P connector.  

8. Turn the ignition switch ON (II).  

9. Measure voltage between IMT actuator 5P connector terminal No. 1 and body ground. 

Fig. 9: Measuring Voltage Between IMT Actuator 5P Connector Terminal No. 1 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES -Go to step 10. 

NO -Repair open in the wire between the PCM (C14) and the IMT actuator, then go to step 27.

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 Intake Air System - RL

  

me 

 

Friday, June 05, 2009 2:36:38 PM

Page 7 

© 2005 Mitchell Repair Information Company, LLC. 

10. Measure voltage between IMT actuator 5P connector terminal No. 3 and body ground. 

Fig. 10: Measuring Voltage Between IMT Actuator 5P Connector Terminal No. 3 And Body 
Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there about 5 V?  

YES -Go to step 11. 

NO -Go to step 16. 

11. Turn the ignition switch OFF.  

12. Jump the SCS line with the HDS.  

13. Disconnect PCM connector C (22P).  

14. Connect IMT actuator 5P connector terminal No. 2 to body ground with a jumper wire. 

Fig. 11: Connecting IMT Actuator 5P Connector Terminal No. 2 To Body Ground With 
Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

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

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Intake Air System - RL

  

me 

 

Friday, June 05, 2009 2:36:38 PM

Page 8 

© 2005 Mitchell Repair Information Company, LLC. 

Fig. 12: Checking Continuity Between PCM Connector Terminal C12 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES -Go to step 21. 

NO -Repair open in the wire between the PCM (C12) and the IMT actuator, then go to step 29. 

16. Turn the ignition switch OFF.  

17. Jump the SCS line with the HDS.  

18. Disconnect PCM connector B (24P).  

19. Connect IMT actuator 5P connector terminal No. 3 to body ground with a jumper wire. 

Fig. 13: Connecting IMT Actuator 5P Connector Terminal No. 3 To Body Ground With 
Jumper Wire 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

20. Check for continuity between PCM connector terminal B11 and body ground. 

 

2007 Acura RL 

2005-08 ENGINE PERFORMANCE Intake Air System - RL

  

me 

 

Friday, June 05, 2009 2:36:38 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC.