Nissan Pathfinder. Manual — part 431
EC-30
< SYSTEM DESCRIPTION >
[VQ35DE]
SYSTEM
SYSTEM
ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM : System Description
INFOID:0000000009178035
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
JSBIA2352GB
SYSTEM
EC-31
< SYSTEM DESCRIPTION >
[VQ35DE]
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ECM controls the engine by various functions.
ENGINE CONTROL SYSTEM : Fail-safe
INFOID:0000000009178036
NON DTC RELATED ITEM
DTC RELATED ITEM
Function
Reference
Multiport fuel injection system
EC-33, "MULTIPORT FUEL INJECTION SYSTEM : System De-
scription"
Electric ignition system
EC-35, "ELECTRIC IGNITION SYSTEM : System Description"
Air conditioning cut control
EC-36, "AIR CONDITIONING CUT CONTROL : System Descrip-
tion"
Automatic speed control device (ASCD)
EC-37, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : Sys-
tem Description"
Cooling fan control
EC-38, "COOLING FAN CONTROL : System Description"
Electronic controlled engine mount
EC-38, "ELECTRONIC CONTROLLED ENGINE MOUNT : Sys-
tem Description"
Evaporative emission system
EC-41, "EVAPORATIVE EMISSION SYSTEM : System Descrip-
tion"
Throttle control
EC-42, "THROTTLE CONTROL : System Description"
Intake valve timing control
EC-42, "INTAKE VALVE TIMING CONTROL : System Description"
Engine protection control at low engine oil pressure
EC-43, "ENGINE PROTECTION CONTROL AT LOW ENGINE
OIL PRESSURE : System Description"
Fuel filler cap warning system
EC-44, "FUEL FILLER CAP WARNING SYSTEM : System De-
scription"
Variable induction air system
EC-45, "VARIABLE INDUCTION AIR SYSTEM : System Descrip-
tion"
Integrated control of engine, CVT, and ABS
EC-46, "INTEGRATED CONTROL OF ENGINE, CVT, AND ABS :
System Description"
CAN communication
EC-46, "CAN COMMUNICATION : System Description"
Engine operating condi-
tion in fail-safe mode
Detected items
Remarks
Reference
page
Engine speed will not
rise more than 2,500 rpm
due to the fuel cut
Malfunction indicator
lamp circuit
When there is an open circuit on MIL circuit, the ECM cannot warn the
driver by illuminating MIL when there is malfunction on engine control
system.
Therefore, when electrical controlled throttle and part of ECM related
diagnoses are continuously detected as NG for 5 trips, ECM warns the
driver that engine control system malfunctions and MIL circuit is open
by means of operating the fail-safe function.
The fail-safe function also operates when above diagnoses except MIL
circuit are detected and demands the driver to repair the malfunction.
DTC No.
Detected items
Engine operating condition in fail-safe mode
P0011
P0021
Intake valve timing control
The signal is not energized to the intake valve timing control solenoid valve and the valve
control does not function.
P0101
P0102
P0103
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
EC-32
< SYSTEM DESCRIPTION >
[VQ35DE]
SYSTEM
P0117
P0118
Engine coolant tempera-
ture sensor circuit
Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT display)
Just as ignition switch is turned ON
or START
40
°C (104°F)
Approx 4 minutes or more after en-
gine starting
80
°C (176°F)
Except as shown above
40 - 80
°C (104 - 176°F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135
Throttle position sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
P0196
P0197
P0198
Engine oil temperature
sensor
Intake valve timing control does not function.
P0500
Vehicle speed sensor
The cooling fan operates (Highest) while engine is running.
P0524
Engine oil pressure
• ECM illuminates oil pressure warning lamp on the combination meter.
• Engine speed will not rise more than 4,000 rpm due to the fuel cut.
• Fail-safe is canceled when ignition switch OFF
→ ON.
P0605
ECM
(When ECM calculation function is malfunctioning:)
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
ECM deactivates ASCD operation.
P0643
Sensor power supply
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P1805
Brake switch
ECM controls the electric throttle control actuator by regulating the throttle opening to a
small range.
Therefore, acceleration will be poor.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
P2100
P2103
Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2101
Electric throttle control
function
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
P2118
Throttle control motor
ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.
DTC No.
Detected items
Engine operating condition in fail-safe mode
SYSTEM
EC-33
< SYSTEM DESCRIPTION >
[VQ35DE]
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MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM : System Description
INFOID:0000000009178037
SYSTEM DIAGRAM
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This sensor is not used to control the engine system under normal conditions.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
P2119
Electric throttle control ac-
tuator
(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.
(When ECM detects the throttle valve is stuck open:)
While the vehicle is being driven, it slows down gradually because of fuel cut. After the
vehicle stops, the engine stalls.
The engine can restart in the N or P position, and engine speed will not exceed 1,000 rpm
or more.
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
Therefore, the acceleration will be poor.
DTC No.
Detected items
Engine operating condition in fail-safe mode
JSBIA3061GB
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