2014 NISSAN TEANA fuel pump

COMPONENT PARTSEC-27
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The ECM activates the fuel pump for 1 second after the ignition
switch is turned ON to improve engine start ability. If the ECM
receives a engine speed signal from the camshaft position sensor
(PHASE), it knows that the engine is rotating, and causes the pump
to operate. If the engine speed signal is not received when the igni-
tion switch is ON, the engine stalls. The ECM stops pump operation
and prevents battery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It sends the control signal
to the fuel pump control module, which in turn controls the fuel
pump.
FUEL LEVEL SENSOR
The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and tr ansmits a signal to the combination meter. The combina-
tion meter sends the fuel level sensor signal to the ECM via the CAN communication line.
It consists of two parts, one is mechanical float and the ot her is variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.
Fuel Tank Temperature SensorINFOID:0000000009462060
The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a ther mistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

*: These data are reference values and are measured between ECM terminals.
Mass Air Flow Sensor (With Intake Air Temperature Sensor)INFOID:0000000009462061
MASS AIR FLOW SENSOR
JPBIA5842ZZ
Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown above Sto ps .
SEF012P
Fluid temperature
[° C ( °F)] Voltage* (V) Resistance (k
Ω)
20 (68) 3.5 2.3 - 2.7
50 (122) 2.2 0.79 - 0.90
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

STRUCTURE AND OPERATIONEC-39
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On Board Refueling Vapor Recovery (ORVR)INFOID:0000000009462090
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 v apor 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 inspectio ns below, be sure to observe the following:
• Put a “CAUTION: FLAMMABL E” sign in workshop.
• Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Be sure 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-proof containe r and put lid on securely.
- Release fuel pressure from fuel line. Refer to EC-536, "Inspection"
.
- Disconnect battery ground cable.
• Always replace O-ring when the fu el gauge retainer is removed.
• Do not kink or twist hose and tube when they are installed.
• Do not tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine a nd check for fuel leaks at connection.
• Do not 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.
JMBIA1930GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

DIAGNOSIS SYSTEM (ECM)EC-81
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PURG VOL C/V %
• Indicates the EVAP canister purge vol-
ume control solenoid valve control value
computed by the ECM according to the
input signals.
• The opening becomes larger as the val- ue increases.
INT/V TIM(B1) °CA • Indicates [
°CA] of intake camshaft ad-
vance angle.
EXH/V TIM B1 °CA • Indicates [
°CA] of exhaust camshaft ad-
vance angle.
INT/V SOL(B1) %• The control value of the intake valve tim-
ing control solenoid valve (determined by
ECM according to the input signals) is in-
dicated.
• The advance angle becomes larger as
the value increases.
SWRL CONT S/V On/Off • The control condition of the intake mani-
fold runner control valve (determined by
ECM according to the input signals) is in-
dicated.
- On: Closed
- Off: Open
VIAS S/V-1 On/Off • The control condition of the intake mani-
fold tuning valve (determined by ECM ac-
cording to the input signals) is indicated.
- On: Closed
- Off: Open
AIR COND RLY On/Off • The air conditioner relay control condi-
tion (determined by ECM according to
the input signals) is indicated.
FUEL PUMP RLY On/Off • Indicates the fuel pump relay control con-
dition determined by ECM according to
the input signals.
VENT CONT/V On/Off • The control condition of the EVAP canis-
ter vent control valve (determined by
ECM according to the input signals) is in-
dicated.
- On: Closed
- Off: Open
THRTL RELAY On/Off • Indicates the throttle
control motor relay
control condition determined by the ECM
according to the input signals.
COOLING FAN Hi/Mid/Low/Off • Indicates the condition of the cooling fan
(determined by ECM according to the in-
put signals).
- Hi: High speed operation
- Mid: Middle speed operation
- Low: Low speed operation
- Off: Stop
HO2S2 HTR (B1) On/Off • Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals.
Monitored item Unit
Monitor Item
Selection
Description Remarks
ECU
IN-
PUT
SIG-
NALS MAIN
SIG-
NAL S
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DIAGNOSIS SYSTEM (ECM)EC-85
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WORK SUPPORT MODE
Work Item
*: This function is not necessary in the usual service procedure.
ACTIVE TEST MODE
Test Item
Work item Condition Usage
IDLE AIR VOL LEARN • The idle air volume that keeps the engine within the spec- ified range is memorized in ECM. When learning the idle air volume
EVAP SYSTEM CLOSE Close the EVAP canister vent control valve in order to make
EVAP system close under the following conditions.
• Ignition switch ON
• Engine not running
• Ambient temperature is above 0 °C (32 °F).
• No vacuum and no high pressure in EVAP system
• Fuel tank temp is more than 0 °C (32 °F).
• Within 10 minutes after starting “EVAP SYSTEM CLOSE”
• When trying to execute “EVAP SYSTEM CLOSE” under the condition except above, CONSULT will discontinue it
and display appropriate instruction.
NOTE:
When starting engine, CONSULT may display “BAT-
TERY VOLTAGE IS LOW. CHARGE BATTERY”, even in
when using a charged battery. When detecting EVAP vapor leak
in the EVAP system
FUEL PRESSURE RELEASE • Fuel pump will st op by touching “START” during idling.
Crank a few times after engine stalls. When releasing fuel pressure from
fuel line
TARGET IGN TIM ADJ* • Idle condition When adjusting target ignition tim- ing
TARGET IDLE RPM ADJ* • Idle condition When setting target idle speed
VIN REGISTRATION • In this mode , VIN is registered in ECM. When registering VIN in ECM
SELF-LEARNING CONT • The coefficient of self-learning control mixture ratio returns to the original coefficient. When clearing mixture ratio self-
learning value
CLSD THL POS LEARN • Ignition on and engine stopped. When learning the throttle valve
closed position
SAVING DATA FOR REPLC CPU In th is mode, save data that is in ECM. When ECM is replaced.
WRITING DATA FOR REPLC CPU In this mode, write data stored by “SAVE DATA FOR CPU
REPLC” in work support mode to ECM. When ECM is replaced.
Test item Condition Judgment Check item (Remedy)
FUEL INJECTION • Engine: Return to the original
trouble condition
• Change the amount of fuel injec- tion using CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Fuel injector
• Air fuel ratio (A/F) sensor 1
ENG COOLANT
TEMP • Engine: Return to the original
trouble condition
• Change the engine coolant tem- perature using CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Engine coolant temperature
sensor
• Fuel injector
PURG VOL CONT/V • Engine: After warming up, run en-
gine at 1,500 rpm.
• Change the EVAP canister purge volume control solenoid valve
opening percent using CON-
SULT. Engine speed changes according
to the opening percent. • Harness and connectors
• Solenoid valve
FUEL/T TEMP SEN • Change the fuel tank temperature using CONSULT.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-86
< SYSTEM DESCRIPTION >[QR25DE]
DIAGNOSIS SYSTEM (ECM)
*: Leaving cooling fan OFF with CONSULT while engine is running may cause the engine to overheat.
DTC WORK SUPPORT MODE
DTC WORK SUPPORT Mode
ALTERNATOR
DUTY • Engine: Idle
• Change duty ratio using CON-
SULT. Battery voltage changes.
• Harness and connectors
•IPDM E/R
•Alternator
FUEL PUMP RELAY • Ignition switch: ON (Engine
stopped)
• Turn the fuel pump relay “ON”
and “OFF” using CONSULT and
listen to operating sound. Fuel pump relay makes the operat-
ing sound. • Harness and connectors
• Fuel pump relay
VIAS S/V-1 • Ignition switch: ON
• Turn intake manifold tuning valve
“ON” and “OFF” using CONSULT
and listen to operating sound. Intake manifold tuning valve motor
makes an operating sound. • Harness and connectors
• Intake manifold tuning valve mo- tor
TUMBLE CONTROL
VA LV E • Ignition switch: ON
• Turn intake manifold runner con-
trol valve “ON” and “OFF” using
CONSULT and listen to operating
sound. Intake Manifold Runner control
valve motor makes an operating
sound. • Harness and connectors
• Intake Manifold Runner control valve motor
IGNITION TIMING • Engine: Return to the original
trouble condition
• Timing light: Set
• Retard the ignition timing using
CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Perform Idle Air Volume Learn-
ing.
POWER BALANCE • Engine: After warming up, idle the
engine.
• A/C switch OFF
• Selector lever: P or N
• Cut off each fuel injector signal one at a time using CONSULT. Engine runs rough or stops. • Harness and connectors
• Compression
• Fuel injector
• Power transistor
• Spark plug
• Ignition coil
VENT CONTROL/V • Ignition switch: ON (Engine
stopped)
• Turn solenoid valve “ON” and “OFF” using CONSULT and listen
to operating sound. Solenoid valve makes an operating
sound. • Harness and connectors
• Solenoid valve
INT V/T ASSIGN AN-
GLE • Engine: Return to the original
trouble condition
• Change intake valve timing using
CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Intake valve timing control sole- noid valve
EXH V/T ASSIGN
ANGLE • Engine: Return to the original
trouble condition
• Change exhaust valve timing us- ing CONSULT. If trouble symptom disappears, see
CHECK ITEM. • Harness and connectors
• Exhaust valve timing control so-
lenoid valve
COOLING FAN* • Ignition switch: ON
• Turn the cooling fan “LOW”, “HI” and “OFF” using CONSULT. Cooling fan moves and stops. • Harness and connectors
• IPDM E/R (Cooling fan relay)
• Cooling fan motor
Test item Condition Judgment Check item (Remedy)
Test mode Test item Corresponding DTC No. Reference page
EVAPORATIVE SYSTEM PURG FLOW P0441 P0441
EC-337
PURG VOL CN/V P1444 P0443EC-342
A/F SEN1 A/F SEN1(B1) P1276 P0130 EC-258
HO2S2HO2S2(B1) P1146 P0138
EC-274HO2S2(B1) P1147 P0137EC-268
HO2S2(B1) P0139 P0139EC-282
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-90
< ECU DIAGNOSIS INFORMATION >[QR25DE]
ECM
VIAS S/V-1• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
•No load When revving engine up to 5,000 rpm
quickly Off
→ On → Off
AIR COND RLY • Engine: After warming up, idle the
engine Air conditioner switch: OFF Off
Air conditioner switch: ON
(Compressor operates) On
FUEL PUMP RLY • For 1 second after turning ignition switch: ON
• Engine running or cranking On
• Except above Off
VENT CONT/V • Ignition switch: ON Off
THRTL RELAY • Ignition switch: ON On
COOLING FAN • Engine: After warming up, idle the
engine
• Air conditioner switch: OFF Engine coolant temperature is 97
°C
(207 °F) or less Off
Engine coolant temperature between
98 °C (208 °F) and 99 °C (210 °F) or more Low
Engine coolant temperature between
100 °C (212 °F) or more Hi
• Engine: After warming up, idle the engine
• Air conditioner switch: ON
• Refrigerant pressure is less than 1,280 kPa (12.80 bar, 13.05 kg/
cm
2, 185.6 psi) Engine coolant temperature is 97
°C
(207 °F) or less Off
Engine coolant temperature between
98 °C (208 °F) and 99 °C (210 °F) or more Mid
Engine coolant temperature between
100 °C (212 °F) or more Hi
HO2S2 HTR (B1) • Engine speed: Below 3,600 rpm after the following conditions are met.
- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load On
• Engine speed: Above 3,600 rpm Off
ALT DUTY SIG • Power generation voltage variable control: Operating On
• Power generation voltage variable control: Not operating Off
I/P PULLY SPD • Vehicle speed: More than 20 km/h (12 MPH) Almost the same speed as
the tachometer indication
VEHICLE SPEED • Turn drive wheels and compare CONSULT value with the speedometer indi-
cation. Almost the same speed as
the speedometer indication
IDL A/V LEARN • Engine: running Idle air volume learning has not been per-
formed yet. YET
Idle air volume learning has already been
performed successfully. CMPLT
TRVL AFTER MIL • Ignition switch: ON Vehicle has traveled after MIL has turned
ON. 0 - 65,535 km
(0 - 40,723 miles)
ENG OIL TEMP • Engine: After warming up More than 70 °C (158 °F)
A/F S1 HTR(B1) • Engine: After warming up, idle the engine
(More than 140 seconds after starting engine.) 4 - 100%
VHCL SPEED SE • Turn drive wheels and compare CONSULT value with the speedometer indi-
cation. Almost the same speed as
the speedometer indication
SET VHCL SPD • Engine: Running ASCD: Operating The preset vehicle speed is
displayed
MAIN SW • Ignition switch: ON MAIN switch: Pressed On
MAIN switch: Released Off
Monitor Item Condition Values/Status
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-94
< ECU DIAGNOSIS INFORMATION >[QR25DE]
ECM
12
(B) — ECM ground — — —
16
(B) — ECM ground — — —
17
(V) 128
(GR) EVAP canister purge vol-
ume control solenoid
valve Output[Engine is running]
• Idle speed
• Accelerator pedal: Not depressed even slightly, after engine starting Battery voltage
(11 - 14 V)
[Engine is running]
• Engine speed: About 2,000 rpm (More than 100 seconds after start-
ing engine.) Battery voltage
(11 - 14 V)
18
(V) 128
(GR) Fuel pump relay Output [Ignition switch: ON]
• For 1 second after turning ignition switch ON
[Engine is running] 0 - 1.0 V
[Ignition switch: ON]
• More than 1 second after turning ig- nition switch ON Battery voltage
(11 - 14 V)
21
(BR) 128
(GR) Throttle control motor re-
lay Output[Ignition switch: OFF]
Battery voltage
(11 - 14 V)
[Ignition switch: ON] 0 - 1.0 V
22
(L) 23
(B) Heated oxygen sensor 2 Input [Engine is running]
• Revving engine from idle to 3,000 rpm quickly after the following condi-
tions are met
- Engine: after warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no
load 0 - 1.0 V
23
(B) —Sensor ground
(Heated oxygen sensor 2) —— —
25
(L) 26
(G) Engine oil temperature
sensor Input [Engine is running] 0 - 4.8 V
Output voltage varies with engine oil temperature.
26
(G) —Sensor ground
(Engine oil temperature
sensor) —— —
27
(BR) —Sensor ground
(Engine coolant tempera-
ture sensor) —— —
Te r m i n a l N o .
(Wire color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/
Output
JMBIA0087GB
JMBIA0088GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

EC-114
< ECU DIAGNOSIS INFORMATION >[QR25DE]
ECM
O2 SEN-
SOR
HEATER 41H A/F sensor 1 heater (Bank 1)
Low Input: P0031
High Input: P0032 81H 0BHConverted value of heater electric cur-
rent to voltage
42H Heated oxygen sensor 2 heat-
er (Bank 1) Low Input: P0037
High Input: P0038 80H 0CH
Converted value of heater electric cur-
rent to voltage
43H Heated oxygen sensor 3 heat-
er (Bank 1) P0043 80H 0CHConverted value of heater electric cur-
rent to voltage
45H A/F sensor 1 heater (Bank 2) Low Input: P0051
High Input: P0052 81H 0BHConverted value of heater electric cur-
rent to voltage
46H Heated oxygen sensor 2 heat-
er (Bank 2) Low Input: P0057
High Input: P0058 80H 0CH
Converted value of heater electric cur-
rent to voltage
47H Heated oxygen sensor 3 heat-
er (Bank 2) P0063 80H 0CHConverted value of heater electric cur-
rent to voltage
SEC-
OND-
ARY AIR 71H Secondary air system P0411 80H 01H
Secondary air injection system incor-
rect flow detected
Bank1: P0491
Bank2: P0492 81H 01H
Secondary air injection system insuffi-
cient flow
P2445 82H 01H Secondary air injection system pump
stuck off
P2448 83H 01H Secondary air injection system high
airflow
Bank1: P2440
Bank2: P2442 84H 01H
Secondary air injection system switch-
ing valve stuck open
P2440 85H 01H Secondary air injection system switch-
ing valve stuck open
P2444 86H 01H Secondary air injection system pump
stuck on
FUEL
SYSTEM 81H
Fuel injection system function
(Bank 1) P0171 or P0172 80H 2FH Long term fuel trim
P0171 or P0172 81H 24H The number of lambda control
clamped
P117A 82H 03H Cylinder A/F imbalance monitoring
82H Fuel injection system function
(Bank 2) P0174 or P0175 80H 2FH Long term fuel trim
P0174 or P0175 81H 24H The number of lambda control
clamped
P117B 82H 03H Cylinder A/F imbalance monitoring
Item
OBD-
MID Self-diagnostic test item DTC Test value and Test
limit
(GST display) Description
TID Unit and
Scaling ID
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM