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![NISSAN LATIO 2009 Service Repair Manual FUEL INJECTOR
EC-989
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
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M A EC
NP
O 3.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector (1) harness NISSAN LATIO 2009 Service Repair Manual FUEL INJECTOR
EC-989
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
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K L
M A EC
NP
O 3.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector (1) harness](/manual-img/5/57359/w960_57359-2344.png)
FUEL INJECTOR
EC-989
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
I
J
K L
M A EC
NP
O 3.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector (1) harness connector.
3. Turn ignition switch ON.
4. Check voltage between fuel injector terminal 1 and ground with CONSULT-III or tester.
OK or NG OK >> GO TO 5.
NG >> GO TO 4. 4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• IPDM E/R harness connector E45
• 10A fuse
• Harness for open or short between fuel injector and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors. 5.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 25, 29, 30, 31. Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG OK >> GO TO 6.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. 6.
CHECK FUEL INJECTOR
Refer to EC-990, " Component Inspection " .
OK or NG OK >> GO TO 7.
NG >> Replace fuel injector. 7.
CHECK INTERMITTENT INCIDENT
Refer to EC-626 . PBIA9870J
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
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.
Resistance: 11.1 - 14.5
Ω [at 10 - 60 °C (50 - 140 °F)]
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![NISSAN LATIO 2009 Service Repair Manual FUEL PUMP
EC-991
< SERVICE INFOMATION >
[MR TYPE 1] C
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FUEL PUMP
Description INFOID:0000000004537529
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the si NISSAN LATIO 2009 Service Repair Manual FUEL PUMP
EC-991
< SERVICE INFOMATION >
[MR TYPE 1] C
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M A EC
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FUEL PUMP
Description INFOID:0000000004537529
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the si](/manual-img/5/57359/w960_57359-2346.png)
FUEL PUMP
EC-991
< SERVICE INFOMATION >
[MR TYPE 1] C
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FUEL PUMP
Description INFOID:0000000004537529
SYSTEM DESCRIPTION
*: 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
startability. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and cam-
shaft position sensor (PHASE), it knows that the engi ne is rotating, and causes the pump to operate. If the
engine speed signal is not received when the ignition s witch 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 rela y, which in turn controls the fuel pump.
COMPONENT DESCRIPTION A turbine type design fuel pump is used in the fuel tank.
• Fuel level sensor unit and fuel pump (1)
• Fuel pressure regulator (2)
• Fuel level sensor (3)
• Fuel tank temperature sensor (4)
CONSULT-III Reference Val ue in Data Monitor Mode INFOID:0000000004537530
Specification data are reference values. Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE) Engine speed*
Fuel pump control Fuel pump relay
Battery Battery voltage* Condition Fuel pump operation
Ignition switch is turned to ON Operates for 1 second
Engine running and cranking Operates
Engine: Stopped Stops in 1.5 seconds
Except as shown above Stops BBIA0704E
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY • For 1 second after turning ignition switch ON
• Engine running or cranking ON
• Except above conditions OFF
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EC
NP
O
Diagnosis Procedure
INFOID:0000000004537532OK >>
INSPECTION END
NG >> GO TO 2. OK >> GO TO 5.
NG >> GO TO 3. OK >> GO TO 4.
NG >> GO TO 11.
TERMI-
NAL NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
23 GR Fuel pump relay [Ignition switch: ON]
• For 1 second after turning ignition switch ON
[Engine is running] 0 - 1.0V
[Ignition switch: ON]
• More than 1 second after turning ignition
switch ON BATTERY VOLTAGE
(11 - 14V)
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OK >> GO TO 9.
NG >> GO TO 6. OK >> GO TO 7.
NG >> Replace fuse. OK >> GO TO 11.
NG >> GO TO 8.
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![NISSAN LATIO 2009 Service Repair Manual FUEL PUMP
EC-995
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
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M A EC
NP
O
• Harness for open or short between IPDM E/R
and “fuel level sensor unit and fuel pump”
>> Repair open circui NISSAN LATIO 2009 Service Repair Manual FUEL PUMP
EC-995
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
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J
K L
M A EC
NP
O
• Harness for open or short between IPDM E/R
and “fuel level sensor unit and fuel pump”
>> Repair open circui](/manual-img/5/57359/w960_57359-2350.png)
FUEL PUMP
EC-995
< SERVICE INFOMATION >
[MR TYPE 1] C
D E
F
G H
I
J
K L
M A EC
NP
O
• Harness for open or short between IPDM E/R
and “fuel level sensor unit and fuel pump”
>> Repair open circuit or short to ground or short to power in harness or connectors. 9.
CHECK FUEL PUMP GROUND CIRCUIT
1. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG OK >> GO TO 10.
NG >> Repair or replace harness or connectors. 10.
CHECK FUEL PUMP
Refer to EC-995, " Component Inspection " .
OK or NG OK >> GO TO 11.
NG >> Replace fuel pump. 11.
CHECK INTERMITTENT INCIDENT
Refer to EC-626 .
OK or NG OK >> Replace IPDM E/R. Refer to
PG-27, " Removal and Installation of IPDM E/R " .
NG >> Repair or replace harness or connectors.
Component Inspection INFOID:0000000004537533
FUEL PUMP 1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check resistance between “fuel level sensor unit and fuel pump” terminals 1 and 3.
3. If NG, replace “fuel level sensor unit and fuel pump”.
Removal and Installation INFOID:0000000004537534
FUEL PUMP Refer to FL-5 .
Continuity should exist.
Resistance: Approximately 0.2 - 5.0 Ω [at 25 °C (77 °F)] SEC918C
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