Honda Accord: Troubleshooting - Engine Mount Control
System - Engine Electrical - Honda Accord MK8 2008-2012 Service ManualHonda Accord: Troubleshooting

Special Tools Required

Vacuum Pump/Gauge, 0-”30 inHg Snap-on YA4000A or equivalent commercially available

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

- Check the liquid filled engine mount for damage. The rubber mount should have dimples in it. This is normal. If the internal bladder ruptures, the rubber mount looks like it is bulging, replace it (see page 5-23).

Follow this procedure if the engine vibrates excessively when idling.

1. Check the idle speed (see page 11-292).

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 (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), then recheck.

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 page 11-204).

4. Turn the ignition switch to LOCK (0).

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

6. Turn the ignition switch to ON (II).

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

ENGINE MOUNT CONTROL SOLENOID VALVE 2P CONNECTOR

Wire side of ft male terminals


Wire side of ft male terminals

Is there battery voltage? YES-Go to step 8.

NO-Repair open in the wire between engine mount control solenoid valve 2P connector terminal No. 2 and the No. 7 (15 A) fuse in the driver's under-dash fuse/relay box.H 8. Start the engine, and let it idle.

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

ENGINE MOUNT CONTROL SOLENOID VALVE 2P CONNECTOR

Wire side of female terminals


Wire side of female terminals

Is there battery voltage? YES

-Go to step 10.

NO

-Repair open in the wire between ECM/PCM connector terminal C40 and engine mount control solenoid valve 2P connector terminal No. 1. If the wire is OK, update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), and recheck.

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 page 11-204).

10. Raise the engine speed above 2,000 rpm.

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

ENGINE MOUNT CONTROL SOLENOID VALVE 2P CONNECTOR

Wire side of female terminals


Wire side of female terminals

Is there battery voltage? YES-Repair short to body ground in the wire between ECM/PCM connector terminal C40 and engine mount control solenoid valve 2P connector terminal No. 1. If the wire is OK, update the ECM/PCM if it does not have the latest software (see page 11-203), or substitute a known-good ECM/PCM (see page 11-7), and recheck. 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 page 11-204).B NO-Go to step 12.

12. Turn the ignition switch to LOCK (0).

13. Disconnect the upper vacuum hose (A) from the engine mount control solenoid valve (B), and connect a vacuum pump/gauge, 0-”30 in Hg, to the hose.

Apply about 20 in Hg of vacuum, and wait 20 seconds.

Does the engine mount hold vacuum?


Does the engine mount hold vacuum? YES-Go to step 14.

NO-Either the vacuum hose or the engine mount has a vacuum leak. Repair as needed.! 14. Start the engine and let it idle.

15. Release the vacuum, then apply vacuum again.

Is there a noticeable change in idle smoothness with and without vacuum applied? YES-Go to step 16.

NO-Replace the front engine mount (see page 5-23).B 16. Connect a vacuum pump/gauge, 0-”30 in Hg, to the vacuum hose (A).

manifold vacuum when you raise the engine speed


manifold vacuum when you raise the engine speed above 2,000 rpm? YES-The system is OK.B NO-Repair the vacuum hose (B) between the intake manifold and the engine mount control solenoid valve. If the vacuum is OK, replace the engine mount control solenoid valve.

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