Nissan Maxima. Manual — part 502
EC-492
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
ELECTRICAL LOAD SIGNAL
>> INSPECTION END
3.
CHECK HEADLAMP SYSTEM
(XENON TYPE) or
(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
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
>>
.
Diagnosis Procedure
INFOID:0000000010095211
Regarding Wiring Diagram information, refer to
.
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
.
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
EC-495, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace electronic controlled engine mount control solenoid valve. Refer to
.
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
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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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
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
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