Diagnosis Procedure

1. Turn ignition switch OFF.
2. Reconnect electronic controlled engine mount control solenoid valve harness connector.
3. Disconnect vacuum hose connected to electronic controlled engine mount.
4. Start engine and let it idle.
5. Check vacuum hose for vacuum existence.

   Vacuum should exist.

Is the inspection result normal?

YES

GO TO 7.

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Check vacuum hoses and vacuum gallery for clogging, cracks or improper connection. Refer to System Description .

Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace vacuum hoses and vacuum gallery.

1. Disconnect electronic controlled engine mount control solenoid valve harness connector.
2. Turn ignition switch ON.
3. Check the voltage between front electronic controlled engine mount harness connector and ground.

   +		-	Voltage
   Electronic controlled engine mount control solenoid valve
   Connector	Terminal
   F64	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 5.

NO

GO TO 4.

1. Turn ignition switch OFF.
2. Disconnect fuse block (J/B) harness connector.
3. Check the continuity between electronic controlled engine mount harness connector and fuse block (J/B) harness connector.

Is the inspection result normal?

YES

Perform the trouble diagnosis for power supply circuit.

NO

Repair or replace error-detected parts.

1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and electronic controlled engine mount control solenoid valve harness connector.

   ECM		Electronic controlled engine mount control solenoid valve		Continuity
   Connector	Terminal	Connector	Terminal
   F79	137	F64	2	Existed

3. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 6.

NO

Repair open circuit, short to ground or short to power in harness connectors.

Check electronic controlled engine mount control solenoid valve. Refer to Component Inspection .

Is the inspection result normal?

YES

GO TO 7.

NO

Replace electronic controlled engine mount control solenoid valve. Refer to VALVE TIMING CONTROL .

1. Turn ignition switch OFF.
2. Install vacuum pump (A) to electronic controlled engine mount .

   Courtesy of NISSAN NORTH AMERICA, INC.

3. Check that a vacuum is maintained when applying the vacuum of -40 kPa (-0.41 kg/cm ² , -5.8 psi) to electronic controlled engine mount.
4. Also visually check electronic controlled engine mount.

Is the inspection result normal?

YES

GO TO 8.

NO

Replace electronic controlled engine mount.

Check intermittent incident. Refer to Intermittent Incident .

Is the inspection result normal?

YES

Replace intake manifold collector. Refer to INTAKE MANIFOLD COLLECTOR .

NO

Repair or replace error-detected parts.