Infiniti M45 (Y34). Manual — part 335
ENGINE CONTROL SYSTEM
EC-29
C
D
E
F
G
H
I
J
K
L
M
A
EC
●
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.
Nissan Torque Demand (NTD) Control System
ABS002VW
INPUT/OUTPUT SIGNAL CHART
*:This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
NTD control system decides the target traction based on the accelerator operation status and the current driv-
ing condition. It then selects the engine torque target by correcting running resistance and atmospheric pres-
sure, and controlling the power-train. Using electric throttle control actuator, it achieves the engine torque
development target which corresponds linearly to the driver's accelerator operation.
Running resistance correction control compares the engine torque estimate value, measured vehicle acceler-
ation, and running resistance on a flat road, and estimates vehicle weight gain and running resistance varia-
tion caused by slopes to correct the engine torque estimate value.
Atmospheric pressure correction control compares the engine torque estimate value from the airflow rate and
the target engine torque for the target traction, and estimates variation of atmospheric pressure to correct the
target engine torque. This system achieves powerful driving without reducing engine performance in the prac-
tical speed range in mountains and high-altitude areas.
Sensor
Input signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Engine speed
NTD control
Electric throttle con-
trol actuator and fuel
injector
Crankshaft position sensor (POS)
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
Park/Neutral position (PNP) switch
Gear position
Power steering pressure sensor
Power steering operation
Battery
Battery voltage
TCM*
A/T control signal
Air conditioner switch*
Air conditioner operation
VDC/TCS/ABS control unit*
VDC/TCS/ABS operation
Wheel sensor*
Vehicle speed
Electrical load*
Electrical load signal
EC-30
ENGINE CONTROL SYSTEM
Air Conditioning Cut Control
ABS002D6
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
●
When the accelerator pedal is fully depressed.
●
When cranking the engine.
●
At high engine speeds.
●
When the engine coolant temperature becomes excessively high.
●
When operating power steering during low engine speed or low vehicle speed.
●
When engine speed is excessively low.
●
When refrigerant pressure is excessively low or high.
Fuel Cut Control (at No Load and High Engine Speed)
ABS002D7
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 1,400 rpm under no load (for example, the selector lever position is neutral and
engine speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off var-
ies based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,000 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under Multiport Fuel Injection (MFI) System,
CAN Communication
ABS002D8
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Sensor
Input Signal to ECM
ECM function
Actuator
Air conditioner switch*
Air conditioner ON signal
Air conditioner
cut control
Air conditioner relay
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Refrigerant pressure sensor
Refrigerant pressure
Power steering pressure sensor
Power steering operation
Wheel sensor*
Vehicle speed
Sensor
Input Signal to ECM
ECM function
Actuator
Park/neutral position (PNP) switch
Neutral position
Fuel cut con-
trol
Fuel injector
Accelerator pedal position sensor
Accelerator pedal position
Engine coolant temperature sensor
Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Wheel sensor*
Vehicle speed
ENGINE CONTROL SYSTEM
EC-31
C
D
E
F
G
H
I
J
K
L
M
A
EC
Each control unit transmits/receives data but selectively reads required data only. Refer to
EC-32
BASIC SERVICE PROCEDURE
BASIC SERVICE PROCEDURE
PFP:00018
Idle Speed and Ignition Timing Check
ABS002D9
IDLE SPEED
With CONSULT-II
Check idle speed in “DATA MONITOR” mode with CONSULT-II.
With GST
Check idle speed with GST.
IGNITION TIMING
Any of following two methods may be used.
Method A
1.
Attach timing light to loop wire as shown.
2.
Check ignition timing.
Method B
1.
Remove No. 1 ignition coil.
SEF058Y
PBIB0139E
PBIB1116E
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