2014 NISSAN TEANA Pressure

COMPONENT PARTSEC-561
< SYSTEM DESCRIPTION > [VQ35DE]
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The mass air flow sensor (1) is plac
ed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sens or controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
INTAKE AIR TEMPERATURE SENSOR
The intake air temperature sensor is built-into mass air flow sensor. The sensor detects intake air temperature
and transmits a signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical
resistance of the thermistor decreases in response to the temperature rise.

*: These data are reference values and are measured between ECM terminals.
Oil Pressure Warning LampINFOID:0000000009462506
Oil pressure warning lamp is located on the combination meter.
It indicates the low pressure of the engine oil and the malfunction of
the engine oil pressure system.
Combination meter turns the oil pressure warning lamp ON/OFF
according to the oil pressure warning lamp signal received from
ECM via CAN communication.
For details, refer to EC-583, "ENGINE PROTECTION CONTROL AT
LOW ENGINE OIL PRESSURE : System Description".
Power Valve Actuator 1 and 2INFOID:0000000009462507
The power valves are used to control the suction pa ssage of the variable induction air control system. They
are set in the fully closed or fully opened position by t he power valve actuators operated by the vacuum stored
in the vacuum tank. The vacuum to power valve actuat ors is controlled by the VIAS control solenoid valves.
PBIA9559J
Intake air temperature
[° C ( °F)] Voltag e* (V)
Resistance (k
Ω)
25 (77) 3.3 1.800 - 2.200
80 (176) 1.2 0.283 - 0.359
SEF012P
PBIA8559J
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-562
< SYSTEM DESCRIPTION >[VQ35DE]
COMPONENT PARTS
Refrigerant Pressure Sensor
INFOID:0000000009462508
The refrigerant pressure sensor is installed at the c ondenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.
Stop Lamp Switch & Brake Pedal Position SwitchINFOID:0000000009462509
Stop lamp switch and brake pedal position switch are installed to brake pedal bracket.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
VIAS Control Solenoid Valve 1 and 2INFOID:0000000009462510
The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to
ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut.
When the ECM sends an ON signal the coil pulls the plunger downward and sends the vacuum signal to the
power valve actuator.
PBIB2657E
Brake pedal Brake pedal position switch Stop lamp switch
Released ON OFF
Depressed OFF ON
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EC-564
< SYSTEM DESCRIPTION >[VQ35DE]
STRUCTURE AND OPERATION
On Board Refueling V apor Recovery (ORVR)
INFOID:0000000009462512
From the beginning of refueling, the air and vapor insi de the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
WARNING:
When conducting inspections below, be sure to observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Never smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Always to furnish the workshop with a CO
2 fire extinguisher.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-pr oof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to EC-687, "Work Procedure"
.
- Disconnect battery ground cable.
• Always replace O-ring when the fu el gauge retainer is removed.
• Never kink or twist hose and tube when they are installed.
• Never tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leakage at connections.
• Never attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, r esulting in fuel spray and possibly a fire.
PBIB1068E
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EC-566
< SYSTEM DESCRIPTION >[VQ35DE]
SYSTEM
ECM controls the engine by various functions.
ENGINE CONTROL SYSTEM : Fail-safeINFOID:0000000009462514
NON DTC RELATED ITEM
DTC RELATED ITEM
Function Reference
Multiport fuel injection system EC-568, "MULTIPORT FUEL INJE
CTION SYSTEM : System De-
scription"
Electric ignition system EC-571, "ELECTRIC IGNITION SYSTEM : System Description"
Air conditioning cut control EC-573, "AIR CONDITIONING CUT
CONTROL : System Descrip-tion"
Automatic speed control device (ASCD) EC-574, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
Cooling fan control
EC-575, "COOLING FAN CONTROL : System Description"
Electronic controlled engine mount EC-577, "ELECTRONIC CONTROLLED ENGINE MOUNT : Sys-tem Description"
Evaporative emission systemEC-580, "EVAPORATIVE EMISSI
ON SYSTEM : System Descrip-tion"
Throttle control EC-581, "THROTTLE CONTROL : System Description"
Intake valve timing control EC-583, "INTAKE VALVE TIMING
CONTROL : System Descrip-tion"
Engine protection control at low engine oil pressure EC-583, "ENGINE PROTECTION
CONTROL AT LOW ENGINE OIL PRESSURE : System Description"
Fuel filler cap warning system EC-585, "FUEL FILLER CAP WARNING SYSTEM : System De-scription"
Variable induction air systemEC-586, "VARIABLE INDUCTION AI
R SYSTEM : System Descrip-tion"
Integrated control of engine, CVT, and ABS EC-588, "INTEGRATED CONTROL OF ENGINE, CVT, AND ABS : System Description"
Alternator power generation voltage variable control systemEC-588, "ALTERNATOR POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
: System Description"
CAN communication EC-588, "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. EC-973
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.
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SYSTEMEC-567
< SYSTEM DESCRIPTION > [VQ35DE]
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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 th rottle 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
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SYSTEMEC-573
< SYSTEM DESCRIPTION > [VQ35DE]
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AIR CONDITIONING CUT CONTROL : System DescriptionINFOID:0000000009462517
SYSTEM DIAGRAM
*1: Automatic air conditioning system
*2: Manual air conditioning system
INPUT/OUTPUT SIGNAL CHART
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: Automatic air conditioning system
*3: Manual air conditioning system
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.
JSBIA2685GB
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Engine speed
*1
Air conditioner
cut control IPDM E/R
↓
Air conditioner relay
↓
Compressor
Camshaft position sensor (PHASE)
Engine coolant temperature sensor Engine coolant temperature
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*1
Refrigerant pressure sensor Refrigerant pressure
Power steering control module EPS operation signal
CAN communi-
cation line
Combination meter Vehicle speed signal
A/C auto amp.
*2• A/C ON signal
• Blower fan ON signal
BCM
*3
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EC-574
< SYSTEM DESCRIPTION >[VQ35DE]
SYSTEM
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System DescriptionINFOID:0000000009462518
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM via the CAN communication line
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a dr iver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric thro ttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indi cator and SET indicator in combination meter. If any
malfunction occurs in the ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in a safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicato r in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET la mp in combination meter illuminates.)
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is pressed during cruise control driving, increase the vehicle speed until
the switch is released or vehicle speed r eaches maximum speed controlled by the system.
And then ASCD will maintain the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• ON/OFF (MAIN) switch pressed (Set speed is cleared)
JSBIA2692GB
Sensor Input signal to ECM ECM function Actuator
Brake pedal position switch Brake pedal operation ASCD vehicle speed control Electric throttle control actuator
Stop lamp switch Brake pedal operation
ASCD steering switch ASCD steering switch operation
Transmission range switch Park/neutral position signal ASCD status signal Combination meter
Combination meter Vehicle speed*
TCM Output shaft revolution signal*
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EC-576
< SYSTEM DESCRIPTION >[VQ35DE]
SYSTEM
Manual Air Conditioning System
INPUT/OUTPUT SIGNAL CHART
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM via the CAN communication line.
*3: Automatic air conditioning system
*4: Manual air conditioning system
SYSTEM DESCRIPTION
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].
JSBIA0321GB
Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*
1
Piston position
Cooling fan
control IPDM E/R
↓
Cooling fan relay
↓
Cooling fan motor
Engine coolant temperature sensor Engine coolant temperature
Refrigerant pressure sensor Refrigerant pressure
Battery Battery voltage*
1
Combination meter
Vehicle speed signal*2
A/C auto amp.*3• A/C ON signal
• Blower fan ON signal
BCM
*4
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM