2014 NISSAN TEANA Service Manual

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Page 1505 of 4801

NISSAN TEANA 2014 Service Manual
FUEL INJECTOREC-505
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
I
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K L
M A
EC
NP
O
FUEL INJECTOR
Component Function CheckINFOID:0000000009462438
1.INSPECTION START
Turn ignition switch to START.

Page 1506 of 4801

NISSAN TEANA 2014 Service Manual
EC-506
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
FUEL INJECTOR
Is the inspection result normal?
YES >> Perform the trouble diagnosis for power supply circuit.
NO >> Repair or replace error-detected parts.
3

Page 1507 of 4801

NISSAN TEANA 2014 Service Manual
FUEL INJECTOREC-507
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
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M A
EC
NP
O
3. Check resistance between fuel injector terminals as per the fol-
lowing.
Is the inspection result normal?
YE

Page 1508 of 4801

NISSAN TEANA 2014 Service Manual
EC-508
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
FUEL PUMP
FUEL PUMP
DescriptionINFOID:0000000009462441
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM a

EC-508
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
FUEL PUMP
FUEL PUMP
DescriptionINFOID:0000000009462441
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
The ECM activates the fuel pump for several seconds 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 ignition switch is ON, the engine stalls. The EC M stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly driv e the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
Component Function CheckINFOID:0000000009462442
1.CHECK FUEL PUMP FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose with two fingers.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Proceed to EC-508, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000009462443
1.CHECK FUEL PUMP RELAY CONTROL SIGNAL
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector.
*1: Except for California
*2: For California
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.CHECK FUEL PUMP RELAY CONTROL SIGNAL CIRCUIT
1. Turn ignition switch OFF.
Sensor Input signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*
Fuel pump controlFuel pump relay
↓
Fuel pump
Battery Battery voltage*
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 Stops.
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after igniti on switch is turned ON.
ECM
Vo l ta g e
+-
Connector Terminal Connector Terminal
F14
*1
F91*218 E10*1
E31*2128Battery voltage should exist 1 second after
ignition switch is turn ON.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 1509 of 4801

NISSAN TEANA 2014 Service Manual
FUEL PUMPEC-509
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
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M A
EC
NP
O
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between EC

Page 1510 of 4801

NISSAN TEANA 2014 Service Manual
EC-510
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
FUEL PUMP
2. Also heck harness for short to power.
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace error-detected parts.
6.CHECK F

Page 1511 of 4801

NISSAN TEANA 2014 Service Manual
IGNITION SIGNALEC-511
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
C
D E
F
G H
I
J
K L
M A
EC
NP
O
IGNITION SIGNAL
Component Function CheckINFOID:0000000009462445
1.INSPECTION START
Turn ignition switch OFF,

Page 1512 of 4801

NISSAN TEANA 2014 Service Manual
EC-512
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
IGNITION SIGNAL
*1: Except for California
*2: For California
Is the inspection result normal?
YES >> GO TO 2.
NO >> Refer to EC-203, "Diagnosis Procedure"
.

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