Infiniti QX56 (Z62). Manual — part 516
EC-42
< SYSTEM DESCRIPTION >
[VK56VD]
SYSTEM
ELECTRIC IGNITION SYSTEM : System Diagram
INFOID:0000000006217705
ELECTRIC IGNITION SYSTEM : System Description
INFOID:0000000006217706
INPUT/OUTPUT SIGNAL CHART
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM via the CAN communication line.
SYSTEM DESCRIPTION
Ignition order: 1 - 8 - 7 - 3 - 6 - 5 - 4 - 2
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Comput-
ing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
JPBIA3271GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor
Engine speed*
1
Piston position
Ignition timing
control
Ignition coil
(with power transistor)
Camshaft position sensor
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
TCM
Gear position
Battery
Battery voltage*
1
Knock sensor
Engine knocking condition
Combination meter
Vehicle speed*
2
SYSTEM
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< SYSTEM DESCRIPTION >
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INTAKE VALVE TIMING CONTROL
INTAKE VALVE TIMING CONTROL : System Diagram
INFOID:0000000006217707
INTAKE VALVE TIMING CONTROL : System Description
INFOID:0000000006217708
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the CAN communication line.
SYSTEM DESCRIPTION
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing control solenoid
valve depending on driving status. This makes it possible to control the shut/open timing of the intake valve to
increase engine torque in low/mid speed range and output in high speed range.
VVEL SYSTEM
JMBIA2174GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor
Engine speed and piston position
Intake valve timing
control
Intake valve timing control
solenoid valve
Camshaft position sensor
Engine oil temperature sensor
Engine oil temperature
Engine coolant temperature sensor
Engine coolant temperature
Combination meter
Vehicle speed*
PBIB3276E
EC-44
< SYSTEM DESCRIPTION >
[VK56VD]
SYSTEM
VVEL SYSTEM : System Diagram
INFOID:0000000006217709
VVEL SYSTEM : System Description
INFOID:0000000006217710
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
JSBIA0539GB
Sensor
Input signal to ECM
ECM function
Actuator
Camshaft position sensor
Crankshaft position sensor
Engine speed and piston position
VVEL control
VVEL control module
↓
VVEL actuator motor assem-
bly
Accelerator pedal position sensor
Accelerator pedal position
VVEL control shaft position sensor
↓
VVEL control module
Control shaft actual angle
1.
VVEL control shaft position sensor
2.
Drive shaft
3.
Link A
4.
Eccentric cam
5.
Output cam
6.
Valve lifter
7.
Intake valve
8.
Intake camshaft sprocket
9.
Control shaft
10. Ball screw shaft
11.
Ball screw nut
12. VVEL actuator motor assembly
13. Rocker arm
14. Link B
JSBIA0463ZZ
SYSTEM
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VVEL (Variable Valve Event & Lift) is a system that controls valve event and valve lift continuously.
ECM decides the target valve lift according to the driving condition and sends the command signal to the
VVEL control module via ENG communication line.
VALVE LIFT OPERATION
Rotational movement of the drive shaft equipped with eccentric cam
is transmitted to output cam via the rocker arm and two kinds of links
to depress the intake valve.
VARIABLE OPERATION
VVEL control module controls the rotation of the control shaft using
the VVEL actuator motor assembly and changes the movement of
the output cam by shifting the link supporting point. As a result, valve
lift changes continuously to improve engine output and response.
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION SYSTEM : System Diagram
INFOID:0000000006256911
EVAPORATIVE EMISSION SYSTEM : System Description
INFOID:0000000006256912
INPUT/OUTPUT SIGNAL CHART
1.
Link B
2.
Output cam
3.
Eccentric cam
4.
Drive shaft
5.
Link A
6.
Rocker arm
JSBIA0464ZZ
1.
Link B
2.
Output cam
3.
Control shaft
4.
Rocker arm
JSBIA0465ZZ
JSBIA0371GB
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