NISSAN LATIO 2009 Service Repair Manual

EC
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Refer to
GW-51 .
>> INSPECTION END .
>> INSPECTION END

EC-986< SERVICE INFOMATION >
[MR TYPE 1]
FUEL INJECTOR
FUEL INJECTOR
Component Description INFOID:0000000004537523
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
CONSULT-III Reference Value in Data Monitor Mode INFOID:0000000004537524
Specification data are reference values. PBIA9664J
MONITOR ITEM CONDITION SPECIFICATION
B/FUEL SCHDL See EC-618 .
INJ PULSE-B1 • Engine: After warming up
• Air conditioner switch: OFF
• Shift lever: P or N (A/T, CVT),
Neutral (M/T)
• No load Idle 2.0 - 3.0 msec
2,000 rpm 1.9 - 2.9 msec

FUEL INJECTOR
EC-987
< SERVICE INFOMATION >
[MR TYPE 1] C
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Wiring Diagram
INFOID:0000000004537525
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
CAUTION: BBWA3003E

EC-988< SERVICE INFOMATION >
[MR TYPE 1]
FUEL INJECTOR
Do not use ECM ground terminals when measuring in put/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground ot her than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Procedure INFOID:00000000045375261.
INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
Yes or No Yes >> GO TO 2.
No >> GO TO 3. 2.
CHECK OVERALL FUNCTION
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “A CTIVE TEST” mode with CONSULT-III.
3. Make sure that each circuit produces a momentary engine speed drop.
Without CONSULT-III
1. Start engine.
2. Listen to each fuel injector operating sound.
OK or NG OK >>
INSPECTION END
NG >> GO TO 3. TERMI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
25
29
30
31 V
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L Fuel injector No. 4
Fuel injector No. 3
Fuel injector No. 2
Fuel injector No. 1 [Engine is running]
• Warm-up condition
• Idle speed NOTE:
The pulse cycle changes depending on rpm at
idle BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14V) PBIB0529E
PBIA4943J
Clicking noise should be heard.
PBIB3332E

FUEL INJECTOR
EC-989
< SERVICE INFOMATION >
[MR TYPE 1] C
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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.

.
Resistance: 11.1 - 14.5
Ω [at 10 - 60 °C (50 - 140 °F)]

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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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)

OK >> GO TO 9.
NG >> GO TO 6. OK >> GO TO 7.
NG >> Replace fuse. OK >> GO TO 11.
NG >> GO TO 8.