Infiniti I35 (A33). Manual — part 343
System Description
NHEC1328
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Engine
mount con-
trol
Electronic controlled engine
mount
Wheel sensor
Vehicle speed
The ECM controls the engine mount operation corresponding to
the engine speed and the vehicle speed. The control system has
2-step control [soft/hard].
Vehicle condition
Engine mount control
Idle (with vehicle stopped)
Soft
Driving
Hard
CONSULT-II Reference Value in Data Monitor
Mode
NHEC1329
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
ENGINE MOUNT
I
Engine: Running
Idle (With vehicle stopped)
“IDLE”
Except above conditions
“TRVL”
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRONIC CONTROLLED ENGINE MOUNT
System Description
EC-713
Wiring Diagram
NHEC1330
MEC372E
SEF640XD
ELECTRONIC CONTROLLED ENGINE MOUNT
Wiring Diagram
EC-714
Diagnostic Procedure
NHEC1331
1
CHECK THE OVERALL FUNCTION
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “ENGINE MOUNTING” in “ACTIVE TEST” mode with CONSULT-II and touch “ON/OFF” on the CONSULT-II
screen.
3. Make sure that the motor operating sound is heard from front electronic controlled engine mount for about 0.5 seconds
according to the switching condition of “ENGINE MOUNTING”.
SEC237C
Without CONSULT-II
1. Make sure that gear position is P.
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. Make sure that the motor operating sound is heard from front electronic controlled engine mount for 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
OK
©
INSPECTION END
NG
©
GO TO 2.
2
CHECK ELECTRONIC CONTROLLED ENGINE MOUNT POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect front or rear electronic controlled engine mount harness connector.
3. Check voltage between electronic controlled engine mount terminal 3 and ground with CONSULT-II or tester.
SEF899X
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 3.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ELECTRONIC CONTROLLED ENGINE MOUNT
Diagnostic Procedure
EC-715
3
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E15, F18
I
15A fuse
I
Joint connector-13
I
Harness for open or short between electronic controlled engine mount and battery
©
Repair harness or connectors.
4
CHECK ELECTRONIC CONTROLLED ENGINE MOUNT OUTPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 4 and electronic controlled engine mount terminal 1, ECM terminal 14
and electronic controlled engine mount terminal 2. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 5.
NG
©
Repair open circuit, short to ground or short to power in harness connectors.
5
CHECK ELECTRONIC CONTROLLED ENGINE MOUNT
Visually check front and rear electronic controlled engine mount.
OK or NG
OK
©
GO TO 6.
NG
©
Replace front or rear engine mount assembly.
6
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
ELECTRONIC CONTROLLED ENGINE MOUNT
Diagnostic Procedure (Cont’d)
EC-716
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