Acura RL. Manual - part 478

3. Check the MOUNT CTRL SOL in the PGM-FI DATA LIST with the HDS. 

Is ON indicated at idling and OFF indicated at 2,000 RPM?  

YES - Go to step 4. 

NO - Update the powertrain control module (PCM) if it does not have the latest software (see 
UPDATING THE PCM ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ), 
then recheck. If the engine mount control system works properly, and the PCM was updated, the 
troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM 
REPLACEMENT ). 

4. Shift the transmission to P or N position.  

5. Disconnect the engine mount control solenoid valve 2P connector from the engine mount control 

solenoid valve.  

6. Measure the voltage between engine mount control solenoid valve 2P connector terminal No. 2 and 

body ground. 

Fig. 3: Measuring Voltage Between Engine Mount Control Solenoid Valve Connector Terminal 
2 And Body Ground 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 7. 

NO - Repair open in the wire between engine mount control solenoid valve 2P connector terminal No. 
2 and No. 18 (15A) fuse in the driver's under-dash fuse/relay box. 

7. Measure the voltage between engine mount control solenoid valve 2P connector terminals No. 1 and 

No. 2, with the engine at idle. 

 

2007 Acura RL 

2005-08 ENGINE Engine Mount Control System - RL

  

me 

 

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Fig. 4: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector 
Terminals 1 And 2 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Go to step 8. 

NO - Repair open in the wire between PCM (B7) and the engine mount control solenoid valve 2P 
connector. If the wire is OK, 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 ), and recheck. If 
the engine mount control system works properly, and the PCM was updated, the troubleshooting is 
complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). 

8. Raise the engine speed above 1,000 RPM.  

9. Measure the voltage between engine mount control solenoid valve 2P connector terminals No. 1 and 

No. 2. 

Fig. 5: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector 
Terminals 1 And 2 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there battery voltage?  

YES - Repair short to body ground in the wire between PCM (B7) and the engine mount control 
solenoid valve. If the wire is OK, 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 ), 
and recheck. If the engine mount control system works properly, and the PCM was updated, the 
troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM 

 

2007 Acura RL 

2005-08 ENGINE Engine Mount Control System - RL

  

me 

 

Friday, June 05, 2009 3:15:20 PM

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© 2005 Mitchell Repair Information Company, LLC. 

REPLACEMENT ). 

NO - Go to step 10. 

10. Disconnect the vacuum hose (A) that is closest to the solenoid connector from the engine mount 

control solenoid valve (B), and connect a commercially available vacuum pump/gauge, 0-30 in.Hg, to 
the hose. Apply about 20 in.Hg of vacuum, and wait for 20 seconds. 

Fig. 6: Identifying Vacuum Hose And Engine Mount Control Solenoid Valve 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Do the engine mounts hold vacuum?  

YES - Go to step 11. 

NO - Either the vacuum hose or one of the engine mounts has a vacuum leak. Repair as needed. 

11. Release the vacuum, then apply vacuum again. 

Is there a noticeable change in idle smoothness with and without vacuum applied?  

YES - Go to step 12. 

NO - Replace the front engine mount and/or rear engine mount. 

12. Connect a commercially available vacuum pump/ gauge, 0-30 in.Hg, to the engine mount control 

solenoid valve port (A) that is closest to the solenoid connector. 

 

2007 Acura RL 

2005-08 ENGINE Engine Mount Control System - RL

  

me 

 

Friday, June 05, 2009 3:15:20 PM

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© 2005 Mitchell Repair Information Company, LLC. 

Fig. 7: Identifying Engine Mount Control Solenoid Valve Port 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there manifold vacuum at idle, and a decrease in manifold vacuum when you raise the engine speed 
above 1,000 RPM?  

YES - The system is OK. 

NO - Replace the engine mount control solenoid valve.

 

2007 Acura RL 

2005-08 ENGINE Engine Mount Control System - RL

  

me 

 

Friday, June 05, 2009 3:15:20 PM

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© 2005 Mitchell Repair Information Company, LLC.