2008 NISSAN TEANA fuel pump

EC-120
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
ON BOARD DIAGNOSTIC (OBD) SYSTEM
*: This item is not used on this vehicle.
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
SET LAMP ON/OFF Indicates [ON/OFF] condition of SET lamp deter-
mined by the ECM according to the input signals.
BAT CUR SEN mV The signal voltage of battery current sensor is
displayed.
ALT DUTY SIG ON/OFF The control condition of the power generation
voltage variable control (determined by ECM ac-
cording to the input signals) is indicated.
ON: Power generation voltage variable control is
active.
OFF: Power generation voltage variable control
is inactive.
A/F ADJ-B1
— Indicates the correction of factor stored in ECM.
The factor is calculated from the difference be-
tween the target air-fuel ratio stored in ECM and
the air-fuel ratio calculated from A/F sensor 1 sig-
nal. A/F ADJ-B2
ALT DUTY % Indicates the duty ratio of the power generation
command value. The ratio is calculated by ECM
based on the battery current sensor signal. Monitored item Unit Description Remarks
TEST ITEM CONDITION JUDGMENT CHECK ITEM (REMEDY)
FUEL INJEC-
TION Engine: Return to the original
non-standard condition
 Change the amount of fuel injec-
tion using CONSULT-III.If malfunctioning symptom disap-
pears, see CHECK ITEM. Harness and connectors
 Fuel injector
 Air fuel ratio (A/F) sensor 1
IGNITION TIM-
ING Engine: Return to the original
non-standard condition
 Timing light: Set
 Retard the ignition timing using
CONSULT-III.If malfunctioning symptom disap-
pears, see CHECK ITEM. Perform Idle Air Volume Learning.
POWER BAL-
ANCE Engine: After warming up, idle the
engine.
 A/C switch OFF
 Selector lever: P or N
 Cut off each injector signal one at
a time using CONSULT-III.Engine runs rough or dies. Harness and connectors
 Compression
 Fuel injector
 Power transistor
Spark plug
 Ignition coil
COOLING FAN*
1
Ignition switch: ON
 Turn the cooling fan “HI”, “MID”,
“LOW” and “OFF” using CON-
SULT-III.Cooling fan moves and stops. Harness and connectors
 Cooling fan motor
 IPDM E/R
ENG COOLANT
TEMP Engine: Return to the original
non-standard condition
 Change the engine coolant tem-
perature using CONSULT-III.If malfunctioning symptom disap-
pears, see CHECK ITEM. Harness and connectors
 Engine coolant temperature sen-
sor
 Fuel injector
FUEL PUMP RE-
LAY Ignition switch: ON (Engine
stopped)
 Turn the fuel pump relay “ON”
and “OFF” using CONSULT-III
and listen to operating sound.Fuel pump relay makes the operat-
ing sound. Harness and connectors
Fuel pump relay

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-127
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1 minute because they may fluctuate. It is NG
if the indication is out of the SP value even a little.
Is the measurement value within the SP value?
YES >> GO TO 17.
NO-1 >> Less than the SP value: GO TO 2.
NO-2 >> More than the SP value: GO TO 3.
2.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 4.
NO >> More than the SP value: GO TO 19.
3.CHECK “B/FUEL SCHDL”
Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and check that the indication is within the SP
value.
Is the measurement value within the SP value?
YES >> GO TO 6.
NO-1 >> More than the SP value: GO TO 6.
NO-2 >> Less than the SP value: GO TO 25.
4.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”
1. Stop the engine.
2. Disconnect PCV hose, and then plug it.
3. Start engine.
4. Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “SPEC” of “DATA MONITOR” mode, and check that the each
indication is within the SP value.
Is the measurement value within the SP value?
YES >> GO TO 5.
NO >> GO TO 6.
5.CHANGE ENGINE OIL
1. Stop the engine.
2. Change engine oil.
NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
ditions.
>> INSPECTION END
6.CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-411, "
Inspection".)
Is the inspection result normal?
YES >> GO TO 9.
NO-1 >> Fuel pressure is too high: Replace “fuel filter and fuel pump assembly” and then. GO TO 8.
NO-2 >> Fuel pressure is too low: GO TO 7.
7.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly” and then GO TO 8.
NO >> Repair or replace malfunctioning part and then GO TO 8.
8.CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

EC-200
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
5. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.
6. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-411, "
Inspection".
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-411, "
Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly”.
NO >> Repair or replace malfunctioning part.
6.CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
Is the measurement value within the specification?
YES >> GO TO 7.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-150, "
Diagnosis Procedure".
7.CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
DTCA/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0171 1 F271
F845
Existed 249
P0174 2 F64153
257
DTCA/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0171 1 F271
F845
Ground Not existed 249
P0174 2 F64153
257
At idling: Approximately 350 kPa (3.50 bar, 3.57 kg/cm2, 51 psi)

EC-204
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
6. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-411, "
Inspection".
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-411, "
Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace “fuel filter and fuel pump assembly”.
5.CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in “Service $01” with GST.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
Is the measurement value within the specification?
YES >> GO TO 6.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-150, "
Diagnosis Procedure".
6.CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
3. Check that each circuit produces a momentary engine speed drop.
With GST
1. Let engine idle.
2. Listen to each fuel injector operating sound.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to
EC-334, "
Diagnosis Procedure".
7.CHECK FUEL INJECTOR
1. Remove fuel injector assembly. Refer to EM-44, "
Removal and Installation".
DTCA/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0172 1 F271
F845
Ground Not existed 249
P0175 2 F64153
257
At idling: Approximately 350 kPa (3.50 bar, 3.57 kg/cm2, 51 psi)
PBIB3332E

P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
EC-211
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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2. Listen to each fuel injector operation.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Perform trouble diagnosis for FUEL INJECTOR, refer to
EC-334, "
Diagnosis Procedure".
5.CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following pro-
cedure.
3. Start engine.
4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
CAUTION:
 Never place to the spark plug and the ignition coil within
50 cm (19.7 in) each other. Be careful not to get an electri-
cal shock while checking, because the electrical dis-
charge voltage becomes 20 kV or more.
 It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is a malfunc-
tioning.
Is the inspection result normal?
YES >> GO TO 9.
NO >> GO TO 6.
6.CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Check ignition coil, power transistor and their circuits. Refer to EC-341, "
Diagnosis Procedure". Clicking sound should be heard.
PBIB3332E
Spark should be generated.
JMBIA0066GB
Spark should be generated.

EC-212
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
7.CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
Is the inspection result normal?
YES >> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to EM-136, "
Spark Plug".
NO >> Repair or clean spark plug. Then GO TO 8.
8.CHECK FUNCTION OF IGNITION COIL-III
1. Reconnect the initial spark plugs.
2. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded portion.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-136, "
Spark
Plug".
9.CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to EM-22, "
Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
10.CHECK FUEL PRESSURE
1. Install all removed parts.
2. Release fuel pressure to zero. Refer to EC-411, "
Inspection".
3. Install fuel pressure gauge and check fuel pressure. Refer to EC-411, "
Inspection".
Is the inspection result normal?
YES >> GO TO 12.
NO >> GO TO 11.
11 .DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly”.
NO >> Repair or replace malfunctioning part.
12.CHECK IGNITION TIMING
Check idle speed and ignition timing.
For procedure, refer to EC-11, "
BASIC INSPECTION : Special Repair Requirement".
For specification, refer to EC-414, "
Idle Speed" and EC-414, "Ignition Timing".
Is the inspection result normal?
YES >> GO TO 13.
NO >> Follow the EC-11, "
BASIC INSPECTION : Special Repair Requirement".
13.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
SEF156I
Spark should be generated.
At idle: Approximately 350 kPa (3.50 bar, 3.57 kg/cm
2, 51 psi)

P0420, P0430 THREE WAY CATALYST FUNCTION
EC-229
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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6.CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following pro-
cedure.
3. Start engine.
4. After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
CAUTION:
 Never place to the spark plug and the ignition coil within
50 cm (19.7 in) each other. Be careful not to get an electri-
cal shock while checking, because the electrical dis-
charge voltage becomes 20 kV or more.
 It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is a malfunc-
tioning.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 7.
7.CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a non-malfunctioning spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Check ignition coil, power transistor and their circuit. Refer to EC-341, "
Diagnosis Procedure".
8.CHECK SPARK PLUGSpark should be generated.
JMBIA0066GB
Spark should be generated.

FUEL PUMP
EC-337
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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FUEL PUMP
DescriptionINFOID:0000000003856843
*: 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 ECM stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
Component Function CheckINFOID:0000000003856844
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 >>EC-337, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003856845
1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
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 crankingOperates.
When engine is stopped Stops in 1.5 seconds.
Except as shown aboveSto ps .
: Vehicle front (Illustration shows
the view with intake air duct re-
moved)
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
JMBIA1391ZZ
ECM
Ground Voltage
Connector Terminal
F7 14 Ground Battery voltage