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Infiniti QX56 (Z62). Manual - part 511

EC-22

< SYSTEM DESCRIPTION >

[VK56VD]

COMPONENT PARTS

Battery Current Sensor (With Battery Temperature Sensor)

INFOID:0000000006217663

OUTLINE

The power generation voltage variable control enables fuel con-
sumption to be decreased by reducing the engine load which is
caused by the power generation of the generator.
Based on sensor signals, ECM judges whether or not the power
generation voltage variable control is performed. When performing
the power generation voltage variable control, ECM calculates the
target power generation voltage based on the sensor signal. And
ECM sends the calculated value as the power generation command
value to IPDM E/R. For the details of the power generation voltage
variable control, refer to

CHG-7, "POWER GENERATION VOLTAGE

VARIABLE CONTROL SYSTEM : System Description"

CAUTION:

Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.

BATTERY CURRENT SENSOR

The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the
charging/discharging current of the battery.

BATTERY TEMPERATURE SENSOR

Battery temperature sensor is integrated in battery current sensor.
The sensor measures ambient temperature around the battery.
The electrical resistance of the thermistor decreases as temperature
increases.
<Reference data>

*: These data are reference values and are measured between ECM terminals.

Camshaft Position Sensor

INFOID:0000000006217664

The camshaft position (CMP) sensor senses the protrusion of the
signal plate installed to the camshaft (INT) front end to identify a par-
ticular cylinder. The camshaft position sensor senses the piston posi-
tion.
The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
When the crankshaft position sensor system becomes inoperative,
the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder iden-
tification signals.

JPBIA3262ZZ

Temperature [

C (

F)]

Voltage* (V)

Resistance (k

Ω

)

25 (77)

3.333

1.9 - 2.1

90 (194)

0.969

0.222 - 0.258

SEF012P

JMBIA0064ZZ

COMPONENT PARTS

EC-23

< SYSTEM DESCRIPTION >

[VK56VD]

ECM receives the signals as shown in the figure.

Crankshaft Position Sensor

INFOID:0000000006217665

The crankshaft position (CKP) sensor senses the protrusion of the
signal plate installed to the drive plate to identify fluctuation of the
engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
ECM receives the signals as shown in the figure.

ECM

INFOID:0000000006217666

• ECM (Engine Control Module) controls the engine.
• The ECM consists of a microcomputer and connectors for trans-

mitting/receiving signals and for supplying power. Furthermore, the
ECM is equipped with an injector driver unit and actuates the fuel
injector at a high voltage (approximately 70 V at the maximum).

• ECM is equipped with ECM temperature sensors. If ECM is over-

heated, ECM controls output torque to prevent damage to itself.

• Battery voltage is supplied to the ECM even when the ignition

switch is turned OFF for the ECM memory function of the DTC
memory, the air-fuel ratio feedback compensation value memory,
the idle air volume learning value memory, etc.

Electric Throttle Control Actuator

INFOID:0000000006217667

OUTLINE

JMBIA1559GB

JMBIA0062ZZ

JMBIA1559GB

JMBIA0057ZZ

EC-24

< SYSTEM DESCRIPTION >

[VK56VD]

COMPONENT PARTS

Electric throttle control actuator consists of throttle body, throttle valve, throttle control motor and throttle posi-
tion sensor.

THROTTLE CONTROL MOTOR

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position
sensor provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions
via the throttle control motor.

THROTTLE POSITION SENSOR

The throttle position (TP) sensor responds to the throttle valve move-
ment.
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

Electrically-controlled cooling fan coupling

INFOID:0000000006217668

Electrically-controlled cooling fan coupling is integrated with a fan coupling, fan coupling driver, and fan speed
sensor, mounted to the fan pulley, and actuated by the drive belt to rotate the cooling fan at a speed suitable
for a driving condition.

JSBIA0270GB

PBIB0145E

JSBIA0289ZZ

COMPONENT PARTS

EC-25

< SYSTEM DESCRIPTION >

[VK56VD]

Engine Coolant Temperature Sensor

INFOID:0000000006217669

The engine coolant temperature (ECT) sensor is used to detect the
engine coolant temperature. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the engine
coolant temperature input. The sensor uses a thermistor which is
sensitive to the change in temperature. The electrical resistance of
the thermistor decreases as temperature increases.

<Reference data>

*: These data are reference values and are measured between ECM terminals.

Engine Oil Temperature Sensor

INFOID:0000000006217670

The engine oil temperature sensor is used to detect the engine oil
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

<Reference data>

*: These data are reference values and are measured between ECM terminals.

Valve

Armature

Magnet Loop Element

Fan speed sensor

Coil

Silicon oil

SEF594K

Engine coolant temperature

[

C (

F)]

Voltage* (V)

Resistance (k

Ω

)

−

10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.35 - 2.73

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

SEF012P

SEF594K

Engine oil temperature

[

C (

F)]

Voltage* (V)

Resistance (k

Ω

)

–10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.35 - 2.73

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

110 (230)

0.6

0.143 - 0.153

SEF012P

Content .. 509 510 511 512 ..