2007 NISSAN LATIO fuel pump

TROUBLE DIAGNOSIS
EC-115
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Revision: June 20062007 Versa
X: Applicable
*1: This item includes 1st trip DTCs.
*2: This mode includes 1st trip freeze frame data or freeze frame data. The items appear on CONSULT-II screen in freeze frame data
mode only if a 1st trip DTC or DTC is detected. For details, refer to EC-52, "
FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME
DATA" .
*3: Always “COMPLT” is displayed.
*4: Models with A/C.
INSPECTION PROCEDURE
Refer to GI-38, "CONSULT-II Start Procedure" .
WORK SUPPORT MODE
Work Item
ENGINE CONTROL COMPONENT PARTS
OUTPUT
Fuel injector×× ×
Power transistor (Ignition timing)×× ×
Throttle control motor relay×××
Throttle control motor×
EVAP canister purge volume con-
trol solenoid valve×××××
Air conditioner relay××
Fuel pump relay××××
Cooling fan relay××××
Air fuel ratio (A/F) sensor 1 heater×××
×*
3
Heated oxygen sensor 2 heater×××
×*3
EVAP canister vent control valve×× ×××
Intake valve timing control solenoid
valve××××
Calculated load value××× ItemDIAGNOSTIC TEST MODE
WORK
SUP-
PORTSELF-DIAGNOSTIC
RESULTS
DATA
MONI-
TORDATA
MONI-
TOR
(SPEC)ACTIVE
TESTDTC & SRT
CONFIRMATION
DTC*
1 FREEZE
FRAME
DATA*
2
SRT
STATUSDTC
WORK
SUP-
PORT
WORK ITEM CONDITION USAGE
FUEL PRESSURE RELEASE

FUEL PUMP WILL STOP BY TOUCHING “START” DUR-
ING IDLING.
CRANK A FEW TIMES AFTER ENGINE STALLS.When releasing fuel pressure
from fuel line
IDLE AIR VOL LEARN

THE IDLE AIR VOLUME THAT KEEPS THE ENGINE
WITHIN THE SPECIFIED RANGE IS MEMORIZED IN
ECM.When learning the idle air volume
SELF-LEARNING CONT

THE COEFFICIENT OF SELF-LEARNING CONTROL
MIXTURE RATIO RETURNS TO THE ORIGINAL COEF-
FICIENT.When clearing the coefficient of
self-learning control value

TROUBLE DIAGNOSIS
EC-119
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Revision: June 20062007 Versa
PURG VOL C/V [%]

Indicates the EVAP canister purge volume
control solenoid valve control value computed
by the ECM according to the input signals.

The opening becomes larger as the value
increases.
INT/V TIM (B1) [°CA]

Indicates [°CA] of intake camshaft advanced
angle.
INT/V SOL (B1) [%]

The control value of the intake valve timing
control solenoid valve (determined by ECM
according to the input signal) is indicated.

The advance angle becomes larger as the
value increases
AIR COND RLY*
[ON/OFF]×

The air conditioner relay control condition
(determined by ECM according to the input
signals) is indicated.
FUEL PUMP RLY
[ON/OFF]×

Indicates the fuel pump relay control condition
determined by ECM according to the input sig-
nals.
VENT CONT/V [ON/
OFF]

The control condition of the EVAP canister
vent control valve (determined by ECM
according to the input signals) is indicated.
ON: Closed
OFF: Open
THRTL RELAY
[ON/OFF]×

Indicates the throttle control motor relay con-
trol condition determined by the ECM accord-
ing to the input signals.
COOLING FAN
[HI/LOW/OFF]×

Indicates the condition of the cooling fan
(determined by ECM according to the input
signals).
HI: High speed operation
LOW: Low speed operation
OFF: Stop
HO2S2 HTR (B1)
[ON/OFF]

Indicates [ON/OFF] condition of heated oxy-
gen sensor 2 heater determined by ECM
according to the input signals.
I/P PULLY SPD
[rpm]

Indicates the engine speed computed from the
turbine revolution sensor signal.
VEHICLE SPEED
[km/h] or [MPH]×

The vehicle speed computed from the vehicle
speed signal sent from TCM is displayed.
IDL A/V LEARN
[YET/CMPLT]

Display the condition of idle air volume learn-
ing
YET: Idle Air Volume Learning has not been
performed yet.
CMPLT: Idle Air Volume Learning has already
been performed successfully.
TRVL AFTER MIL
[km] or [mile]

Distance traveled while MIL is activated.
A/F S1 HTR (B1) [%]

Indicates A/F sensor 1 heater control value
computed by ECM according to the input sig-
nals.

The current flow to the heater becomes larger
as the value increases.
AC PRESS SEN [V]*×

The signal voltage from the refrigerant pres-
sure sensor is displayed. Monitored item [Unit]ECM
INPUT
SIG-
NALSMAIN
SIG-
NALSDescription Remarks

TROUBLE DIAGNOSIS
EC-121
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Revision: June 20062007 Versa
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
DATA MONITOR (SPEC) MODE
Monitored Item
NOTE:
Any monitored item that does not match the vehicle being diagnosed is deleted from the display automatically.
ACTIVE TEST MODE
Test Item
Monitored item [Unit]ECM
input
signalsMain
signalsDescription Remarks
ENG SPEED [rpm]××

Indicates the engine speed computed
from the signal of the crankshaft position
sensor (POS) and camshaft position
sensor (PHASE).
MAS A/F SE-B1 [V]××

The signal voltage of the mass air flow
sensor specification is displayed.
When engine is running specification
range is indicated.
B/FUEL SCHDL
[msec]×

“Base fuel schedule” indicates the fuel
injection pulse width programmed into
ECM, prior to any learned on board cor-
rection.

When engine is running specification
range is indicated.
A/F ALPHA-B1 [%]×

The mean value of the air-fuel ratio feed-
back correction factor per cycle is indi-
cated.
When engine is running specification
range is indicated.

This data also includes the data for the
air-fuel ratio learning control.
TEST ITEM CONDITION JUDGEMENT CHECK ITEM (REMEDY)
FUEL INJEC-
TION

Engine: Return to the original
trouble condition

Change the amount of fuel injec-
tion using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.

Harness and connectors

Fuel injector

Air fuel ratio (A/F) sensor 1
IGNITION TIM-
ING

Engine: Return to the original
trouble condition

Timing light: Set

Retard the ignition timing using
CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.

Perform Idle Air Volume Learning.
POWER BAL-
ANCE

Engine: After warming up, idle
the engine.

A/C switch OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

Cut off each fuel injector signal
one at a time using CONSULT-II.Engine runs rough or dies.

Harness and connectors

Compression

Fuel injector

Power transistor

Spark plug

Ignition coil
COOLING FAN*

Ignition switch: ON

Turn the cooling fan “LOW”, “HI”
and “OFF” with CONSULT-II.Cooling fan moves and stops.

Harness and connectors

Cooling fan relay

Cooling fan motor
ENG COOLANT
TEMP

Engine: Return to the original
trouble condition

Change the engine coolant tem-
perature using CONSULT-II.If trouble symptom disappears, see
CHECK ITEM.

Harness and connectors

Engine coolant temperature sen-
sor

Fuel injector
FUEL PUMP
RELAY

Ignition switch: ON
(Engine stopped)

Turn the fuel pump relay ON and
OFF using CONSULT-II and lis-
ten to operating sound.Fuel pump relay makes the operat-
ing sound.
Harness and connectors

Fuel pump relay

TROUBLE DIAGNOSIS
EC-129
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Revision: June 20062007 VersaINJ PULSE-B1

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec
IGN TIMING

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle 8° - 18° BTDC
2,000 rpm 25° - 45° BTDC
CAL/LD VALUE

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle 10% - 35%
2,500 rpm 10% - 35%
MASS AIRFLOW

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle 1.0 - 4.0 g·m/s
2,500 rpm 2.0 - 10.0 g·m/s
PURG VOL C/V

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle
(Accelerator pedal is not depressed
even slightly, after engine starting)0%
2,000 rpm 0 - 50%
INT/V TIM (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle−5° - 5°CA
When revving engine up to 2,000 rpm
quicklyApprox. 0° - 40°CA
INT/V SOL (B1)

Engine: After warming up

Air conditioner switch: OFF

Shift lever: P or N (A/T, CVT),
Neutral (M/T)

No loadIdle 0% - 2%
When revving engine up to 2,000 rpm
quicklyApprox. 0% - 90%
AIR COND RLY*
2
Engine: After warming up, idle
the engineAir 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 crankingON

Except above conditions 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: OFFEngine coolant temperature: 97°C
(207°F) or lessOFF
Engine coolant temperature: Between
98°C (208°F) and 99°C (210°F)LOW
Engine coolant temperature: 100°C
(212°F) or moreHIGH MONITOR ITEM CONDITION SPECIFICATION

TROUBLE DIAGNOSIS - SPECIFICATION VALUE
EC-137
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5. CHANGE ENGINE OIL
1. Stop the engine.
2. Change engine oil. Refer to LU-6, "
Changing 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-
dition.
>>INSPECTION END
6. CHECK FUEL PRESSURE
Check fuel pressure. (Refer to EC-81, "
Fuel Pressure Check" .)
OK or NG
OK >> GO TO 9.
NG (Fuel pressure is too high)>>Replace fuel pressure regulator, refer to EC-81, "
Fuel Pressure Check" .
GO TO 8.
NG (Fuel pressure is too low)>>GO TO 7.
7. DETECT MALFUNCTIONING PART
1. Check the following.
–Clogged and bent fuel hose and fuel tube
–Clogged fuel filter
–Fuel pump and its circuit (Refer to EC-570, "FUEL PUMP" .)
2. If NG, repair or replace the malfunctioning part. (Refer to EC-81, "
Fuel Pressure Check" .)
If OK, replace fuel pressure regulator.
>> GO TO 8.
8. CHECK “A/F ALPHA-B1”
1. Start engine.
2. Select “A/F ALPHA-B1” in “DATA MONITOR (SPEC)” mode, and make sure that the indication is within
the SP value.
OK or NG
OK >>INSPECTION END
NG >> GO TO 9.
9. PERFORM POWER BALANCE TEST
1. Perform “POWER BALANCE” in “ACTIVE TEST” mode.
2. Make sure that the each cylinder produces a momentary engine
speed drop.
OK or NG
OK >> GO TO 12.
NG >> GO TO 10.
PBIB0133E

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-281
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4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-81, "
FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-81, "
FUEL PRESSURE CHECK" .
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

Fuel pump and circuit (Refer to EC-570, "FUEL PUMP" .)

Fuel pressure regulator (Refer to EC-81, "FUEL PRESSURE CHECK" .)

Fuel lines (Refer to EM-33, "FUEL INJECTOR AND FUEL TUBE" .)

Fuel filter for clogging
>> Repair or replace.
6. CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.
With GST
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Check mass air flow sensor signal in Service $01 with GST.
OK or NG
OK >> GO TO 7.
NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-178, "
DTC P0101 MAF SENSOR" . At idling: Approximately 350 kPa (3.57 kg/cm
2 , 51 psi)
at idling : 1.0 - 4.0 g·m/sec
at 2,500 rpm : 2.0 - 10.0 g·m/sec
at idling : 1.0 - 4.0 g·m/sec
at 2,500 rpm : 2.0 - 10.0 g·m/sec

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-289
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4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-81, "
FUEL PRESSURE RELEASE" .
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-81, "
FUEL PRESSURE CHECK" .
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.

Fuel pump and circuit (Refer to EC-570, "FUEL PUMP" .)

Fuel pressure regulator (Refer to EC-81, "FUEL PRESSURE CHECK" .)
>> Repair or replace.
6. CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.
With GST
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Check mass air flow sensor signal in Service $01 with GST.
OK or NG
OK >> GO TO 7.
NG >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-178, "
DTC P0101 MAF SENSOR" . At idling: Approximately 350 kPa (3.57 kg/cm2, 51 psi)
at idling : 1.0 - 4.0 g·m/sec
at 2,500 rpm : 2.0 - 10.0 g·m/sec
at idling : 1.0 - 4.0 g·m/sec
at 2,500 rpm : 2.0 - 10.0 g·m/sec

DTC P0181 FTT SENSOR
EC-291
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DTC P0181 FTT SENSORPFP:22630
Component DescriptionUBS00QGD
The fuel tank temperature sensor (4) is used to detect the fuel tem-
perature inside the fuel tank. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the fuel
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

Fuel level sensor unit and fuel pump (1)

Fuel pressure regulator (2)

Fuel level sensor (3)

*: This data is reference values and is measured between ECM terminal 43 (Fuel
tank temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result damage the ECM's transistor. Use
ground other than ECM, such as ground.
On Board Diagnosis LogicUBS00QGE
DTC Confirmation ProcedureUBS00QGF
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 10 seconds.
If the result is NG, go to EC-294, "
Diagnostic Procedure" .
If the result is OK, go to following step.
4. Check “COOLAN TEMP/S” value.
If the “COOLANT TEMP/S” is less than 60°C (140°F), the result
will be OK.
If the “COOLANT TEMP/S” is above 60°C (140°F), go to the fol-
lowing step.
5. Cool engine down until “COOLAN TEMP/S” signal is less than
60°C (140°F).
6. Wait at least 10 seconds.
7. If 1st trip DTC is detected, go to EC-294, "
Diagnostic Procedure" .
BBIA0704E
Fluid temperature
°C (°F)Voltage*
VResistance
kΩ
20 (68) 3.5 2.3 - 2.7
50 (122) 2.2 0.79 - 0.90
SEF 0 12 P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0181
0181Fuel tank temperature
sensor circuit range/
performanceRationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage sig-
nals from engine coolant temperature sensor
and intake air temperature sensor.

Harness or connectors
(Fuel tank temperature sensor circuit is
open or shorted)

Fuel tank temperature sensor
SEF 1 74 Y