Acura TSX / Honda Accord CL. Manual - part 486

Special Tools Required: Vacuum pump/gauge, 0-30 in. Hg A973X-041-XXXXX 

Follow this procedure if the engine vibrates excessively when idling. 

1. Check the idle speed (see IDLE SPEED INSPECTION ).  

2. Raise the engine speed from idling to 2,000 RPM.  

3. Check the MOUNT CTRL SOL in the PGM-FI DATA LIST with the Honda diagnostic system (HDS). 

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

YES: Go to step 4.  

NO: Update the engine control module (ECM)/powertrain control module (PCM) if it does 
not have the latest software, or substitute a known-good ECM/PCM, then recheck. See 
ECM/PCM UPDATING AND SUBSTITUTION FOR TESTING . If the engine mount 
control system works properly, and the ECM/PCM was updated, the troubleshooting is 
complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see HOW TO 
REMOVE THE ECM/PCM FOR TESTING ).  

4. Shift to Park or Neutral position.  

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

valve.  

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

ground. 

Is there battery voltage? 

YES: Go to step 7.  

NO: Repair an open in the wire between engine mount control solenoid valve and No. 18 
(15A) fuse in the under-dash fuse/relay box. 

NOTE:

Check the vacuum hoses and lines for damage and proper connections before 
troubleshooting.

 

2004 Acura TSX 

2004 ENGINES Engine Mount Control System - TSX

  

 

Fig. 3: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector 
Terminal No. 2 & Body Ground 

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

Is there battery voltage? 

YES: Go to step 8.  

NO: Repair an open in the wire between ECM/PCM (B15) and the engine mount control 
solenoid valve 2P connector. If the wire is OK, update the ECM/PCM if it does not have the 
latest software, or substitute a known-good ECM/PCM, and recheck. See ECM/PCM 
UPDATING AND SUBSTITUTION FOR TESTING . If the engine mount control system 
works properly, and the ECM/PCM was updated, the troubleshooting is complete. If the 
ECM/PCM was substituted, replace the original ECM/PCM (see HOW TO REMOVE THE 
ECM/PCM FOR TESTING ). 

 

2004 Acura TSX 

2004 ENGINES Engine Mount Control System - TSX

  

 

Fig. 4: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector 
Terminals No. 1 & No. 2 

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

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

Is there battery voltage? 

YES: Repair a short to body ground in the wire between ECM/PCM (B15) and the engine 
mount control solenoid valve. If the wire is OK, update the ECM/PCM if it does not have the 
latest software, or substitute a known-good ECM/PCM, and recheck. See ECM/PCM 
UPDATING AND SUBSTITUTION FOR TESTING . If the engine mount control system 
works properly, and the ECM/PCM was updated, the troubleshooting is complete. If the 
ECM/PCM was substituted, replace the original ECM/PCM (see HOW TO REMOVE THE 
ECM/PCM FOR TESTING ).  

NO: Go to step 10.  

 

2004 Acura TSX 

2004 ENGINES Engine Mount Control System - TSX

  

 

Fig. 5: Measuring Voltage Between Engine Mount Control Solenoid Valve 2P Connector 
Terminals No. 1 & No. 2 

10. Disconnect the upper vacuum hose (A) from the engine mount control solenoid valve (B), and connect a 

vacuum pump/gauge to the hose. Apply about 20 in. Hg of vacuum, and wait 20 seconds. 

 

2004 Acura TSX 

2004 ENGINES Engine Mount Control System - TSX