NISSAN LATIO 2010 Service Repair Manual

EC-1006
< SERVICE INFORMATION >[MR18DE]
ASCD INDICATOR
OK or NG
OK >>
INSPECTION END
NG >> GO TO 2.
2.CHECK DTC
Check that DTC UXXXX is not displayed.
Ye s o r N o
Yes >> Perform trouble diagnoses for DTC UXXXX.
No >> GO TO 3.
3.CHECK COMBINATION METER OPERATION
Does combination meter operate normally?
Ye s o r N o
Ye s > > G O T O 4 .
No >> Check combination meter circuit. Refer to DI-4
.
4.CHECK INTERMITTENT INCIDENT
Refer to EC-632
.
>> INSPECTION END
ASCD Indicator ConditionSpecification
CRUISE LAMP • Ignition switch: ONMAIN switch: Pressed at 1st
time
→ 2nd ON
→ OFF
SET LAMP •MAIN switch: ON
• Vehicle: Between 40 km/h (25
MPH) and 144 km/h (89
MPH) ASCD: Operating
ON
ASCD: Not operating OFF
Revision: January 20102010 Versa

ELECTRICAL LOAD SIGNALEC-1007
< SERVICE INFORMATION > [MR18DE]
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ELECTRICAL LOAD SIGNAL
CONSULT-III Reference Val
ue in Data Monitor ModeINFOID:0000000005532902
Specification data are reference values.
Diagnosis ProcedureINFOID:0000000005532903
1.CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1. Turn ignition switch ON.
2. Check “LOAD SIGNAL” in “DATA MONITOR” mode with CONSULT-III under the following conditions.
OK or NG
OK >> GO TO 2.
NG >> GO TO 4.
2.CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check “LOAD SIGNAL” in “DATA MONITOR” mode with CONSULT-III under the following conditions.
OK or NG
OK >> GO TO 3.
NG >> GO TO 5.
3.CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION
Check “HEATER FAN SW” in “DATA MONITOR” mode with CONSULT-III under the following conditions.
OK or NG
OK >> INSPECTION END .
NG >> GO TO 6.
4.CHECK HEADLAMP SYSTEM
Refer to LT- 6
or LT- 2 8.
>> INSPECTION END
5.CHECK REAR WINDOW DEFOGGER SYSTEM
Monitor item ConditionSpecification
LOAD SIGNAL • Ignition switch: ON Rear window defogger switch is ON and/or lighting
switch is in 2nd position.
ON
Rear window defogger switch is OFF and lighting switch
is OFF. OFF
HEATER FAN SW • Ignition switch: ON Heater fan: Operating.
ON
Heater fan: Not operating. OFF
ConditionLOAD SIGNAL
Lighting switch: ON at 2nd position ON
Lighting switch: OFF OFF
ConditionLOAD SIGNAL
Rear window defogger switch: ON ON
Rear window defogger switch: OFF OFF
ConditionHEATER FAN SW
Heater fan control switch: ON ON
Heater fan control switch: OFF OFF
Revision: January 20102010 Versa

EC-1008
< SERVICE INFORMATION >[MR18DE]
ELECTRICAL LOAD SIGNAL
Refer to
GW-51, "Component Parts and Harness Connector Location".
>> INSPECTION END
6.CHECK HEATER FAN CONTROL SYSTEM
Refer to MTC-22, "
CONSULT-III Function (BCM)".
>> INSPECTION END
Revision: January 20102010 Versa

FUEL INJECTOREC-1009
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FUEL INJECTOR
Component DescriptionINFOID:0000000005532904
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 Val
ue in Data Monitor ModeINFOID:0000000005532905
Specification data are reference values.
PBIA9664J
Monitor item Condition Specification
B/FUEL SCHDL See EC-624
.
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
Revision: January 20102010 Versa

EC-1010
< SERVICE INFORMATION >[MR18DE]
FUEL INJECTOR
Wiring Diagram
INFOID:0000000005532906
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
CAUTION:
BBWA3003E
Revision: January 20102010 Versa

FUEL INJECTOREC-1011
< SERVICE INFORMATION > [MR18DE]
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Do not use ECM ground terminals wh
en measuring input/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 ProcedureINFOID:0000000005532907
1.INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
Ye s o r N o
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
Y
O 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 - 14 V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm BATTERY VOLTAGE
(11 - 14 V)
PBIB0529E
PBIA4943J
Clicking noise should be heard.
PBIB3332E
Revision: January 20102010 Versa

EC-1012
< SERVICE INFORMATION >[MR18DE]
FUEL INJECTOR
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
• 10 A 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-1013, "
Component Inspection".
OK or NG
OK >> GO TO 7.
NG >> Replace fuel injector.
7.CHECK INTERMITTENT INCIDENT
Refer to EC-632
.
PBIA9870J
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
Revision: January 20102010 Versa

FUEL INJECTOREC-1013
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>>
INSPECTION END
Component InspectionINFOID:0000000005532908
FUEL INJECTOR
1. Disconnect fuel injector harness connector.
2. Check resistance between terminals as shown in the figure.
3. If NG, replace fuel injector.
Removal and InstallationINFOID:0000000005532909
FUEL INJECTOR
Refer to EM-152.
Resistance: 11.1 - 14.5
Ω [at 10 - 60 °C (50 - 140° F)]
PBIA9579J
Revision: January 20102010 Versa

EC-1014
< SERVICE INFORMATION >[MR18DE]
FUEL PUMP
FUEL PUMP
DescriptionINFOID:0000000005532910
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
start ability. If the ECM receives a engine speed signal
from the crankshaft position sensor (POS) and cam-
shaft 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 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 Value in Data Monitor ModeINFOID:0000000005532911
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 St ops
BBIA0704E
Monitor itemCondition Specification
FUEL PUMP RLY • For 1 second after turning ignition switch ON
• Engine running or cranking
ON
• Except above conditions OFF
Revision: January 20102010 Versa

FUEL PUMPEC-1015
< SERVICE INFORMATION > [MR18DE]
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Wiring DiagramINFOID:0000000005532912
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals wh
en measuring input/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.
AABWA0323GB
Revision: January 20102010 Versa