Nissan Maxima. Manual - part 502

EC-492

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ELECTRICAL LOAD SIGNAL

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-6, "Work Flow"

 (XENON TYPE) or 

EXL-171, "Work Flow"

 (HALOGEN TYPE).

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HA-17, "WITH COLOR DISPLAY : How to Perform Trouble Diagnosis For Quick And Accurate

Repair"

 (with color display) or 

HA-17, "WITH MONOCHROME DISPLAY : How to Perform Trouble Diagnosis

For Quick And Accurate Repair"

 (with monochrome display).

>> INSPECTION END

ELECTRONIC CONTROLLED ENGINE MOUNT

EC-493

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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ELECTRONIC CONTROLLED ENGINE MOUNT

Description

INFOID:0000000010095209

In the idle range, ECM turns OFF the electronically-controlled engine mount control solenoid valve and applies

manifold pressure to the electronically controlled engine mount. This decreases damping force of the electron-

ically-controlled engine mount and absorbs vibrations traveling from the engine to the body for improving the

quietness.

In the driving range, ECM turns ON the electronically-controlled engine mount control solenoid valve and cuts

manifold pressure applied on the electronically-controlled engine mount. This increases damping force of the

electronically-controlled engine mount and reduces vibrations generated during driving.

Component Function Check

INFOID:0000000010095210

1.

CHECK OVERALL FUNCTION

 With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT and touch “ON/OFF” on the CON-

SULT screen.

3. Check that the motor operating sound is heard from front electronic controlled engine mount and rear

electronic controlled engine mount for about 0.5 seconds according to the switching condition of “ENGINE

MOUNTING”.

 Without CONSULT

1. Make sure that gear position is P or N.

2. Start engine and let it idle.

3. Change the engine speed from idle to more than 1,000 rpm and then return to idle (with vehicle stopped).

4. Check that the motor operating sound is heard from front electronic controlled engine mount for and rear

electronic controlled engine mount about 0.5 seconds when changing engine speed.

It is better to hear the operating sound around the left side front wheel house.

OK or NG

YES

>> INSPECTION END

NO

>>

EC-493, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095211

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK VACUUM SOURCE

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.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

2.

CHECK VACUUM HOSES AND VACUUM GALLERY

1. Turn ignition switch OFF.

2. Check vacuum hoses and vacuum gallery for clogging, cracks or improper connection. Refer to 

EC-85,

"System Description"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace vacuum hoses and vacuum gallery.

3.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE POWER SUPPLY

Vacuum should exist.

EC-494

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

ELECTRONIC CONTROLLED ENGINE MOUNT

CIRCUIT
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.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• 10 A fuse (No. 3)

• Fuse block (J/B) E6

• Harness connectors E3, F1

• Junction connectors E44, E46

• Harness for open or short between electronic controlled engine mount control solenoid valve and fuse

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

5.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE OUTPUT SIG-

NAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.

2. Check the continuity between ECM harness connector and electronic controlled engine mount control

solenoid valve harness connector.

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.

6.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE

Refer to 

EC-495, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace electronic controlled engine mount control solenoid valve. Refer to 

EC-85, "System

Description"

.

7.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT

1. Turn ignition switch OFF.

Electronic controlled engine mount 

control solenoid valve

Ground

Voltage

Connector

Terminal

F64

1

Ground

Battery voltage

SEF206W

ECM

Electronic controlled engine 

mount control solenoid valve

Continuity

Connector

Terminal

Connector

Terminal

F14

28

F64

2

Existed

ELECTRONIC CONTROLLED ENGINE MOUNT

EC-495

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2. Install vacuum pump (A) to electronic controlled engine mount

(1).

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. Refer to

EC-38, "Component Parts Location"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace intake manifold collector. Refer to .

EM-25, "Removal and Installation"

NO

>> Repair or replace malfunctioning part.

Component Inspection

INFOID:0000000010095212

1.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE

 With CONSULT

1. Turn ignition switch OFF.

2. Reconnect electronic controlled engine mount control solenoid valve harness connector.

3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve.

4. Turn ignition switch ON.

5. Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT.

6. Check air passage continuity and operation delay time under the

following conditions.

 Without CONSULT

1. Turn ignition switch OFF.

2. Disconnect electronic controlled engine mount control solenoid

valve harness connector.

3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve.

4. Check air passage continuity and operation delay time under the

following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace electronic controlled engine mount control sole-

noid valve.

MBIB1237E

Condition

(ENGINE MOUNTING)

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

TRVL

Existed

Not existed

IDLE

Not existed

Existed

Condition

Air passage continuity 

between (A) and (B)

Air passage continuity 

between (A) and (C)

12 V direct current supply be-
tween terminals 1 and 2

Existed

Not existed

No supply

Not existed

Existed

JMBIA0180ZZ

PBIB2532E