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EC-424
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FUEL INJECTOR
Wiring Diagram
INFOID:0000000005398606
Diagnosis ProcedureINFOID:0000000005398607
1.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
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4. Check the voltage between fuel injector harness connector and
ground.
Is the inspection result normal?
YES >> GO NISSAN LATIO 2010 Service Repair Manual FUEL INJECTOREC-425
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4. Check the voltage between fuel injector harness connector and
ground.
Is the inspection result normal?
YES >> GO](/manual-img/5/57358/w960_57358-1689.png)
FUEL INJECTOREC-425
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4. Check the voltage between fuel injector harness connector and
ground.
Is the inspection result normal?
YES >> GO TO 3.
NO >> GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector E45
• 10 A fuse (No. 55)
• 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.
3.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel injector harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK FUEL INJECTOR
Refer to EC-425, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 5.
NO >> Replace malfunctioning fuel injector.
5.CHECK INTERMITTENT INCIDENT
Refer to EC-114, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
Component InspectionINFOID:0000000005398608
1.CHECK FUEL INJECTOR
1. Turn ignition switch OFF.
Fuel injector Ground Voltage
Cylinder Connector Terminal
1F17 1
Ground Battery voltage
2F
18 1
3F 19 1
4F 20 1
JMBIA1636ZZ
Fuel injector ECM
Continuity
Cylinder Connector Terminal Connector Terminal
1F17 2
F1031
Existed
2F18 2
30
3F19 2 29
4F20 2 25
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EC-426
< COMPONENT DIAGNOSIS >[HR16DE]
FUEL INJECTOR
2. Disconnect fuel injector harness connector.
3. Check resistance between fuel injector terminals as per the fol-
lowing.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace malfunctioning fuel injector.
Terminals Resistance
1 and 2 11.1 - 14.5 Ω [at 10 - 60°C (50 - 140 °F)]
JMBIA1637ZZ
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FUEL PUMP
DescriptionINFOID:0000000005398609
*: ECM determines the start signal status by the signals of engine speed a NISSAN LATIO 2010 Service Repair Manual FUEL PUMPEC-427
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FUEL PUMP
DescriptionINFOID:0000000005398609
*: ECM determines the start signal status by the signals of engine speed a](/manual-img/5/57358/w960_57358-1691.png)
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FUEL PUMP
DescriptionINFOID:0000000005398609
*: 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 EC M stops pump operation and prevents battery discharging,
thereby improving safety. The ECM does not directly dr ive the fuel pump. It controls the ON/OFF fuel pump
relay, which in turn controls the fuel pump.
Component Function CheckINFOID:0000000005398610
1.CHECK FUEL PUMP FUNCTION
1. Turn ignition switch ON.
2. Pinch fuel feed hose (1) with two fingers.
Is the inspection result normal?
YES >> INSPECTION END
NO >> EC-428, "
Diagnosis Procedure".
Sensor Input signal to ECMECM functionActuator
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 cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown above Sto ps .
Fuel pressure pulsation should be felt on the fuel feed
hose for 1 second after ignition switch is turned ON.
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EC-428
< COMPONENT DIAGNOSIS >[HR16DE]
FUEL PUMP
Wiring Diagram
INFOID:0000000005398611
Diagnosis ProcedureINFOID:0000000005398612
1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
AABWA0317GB
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4. Check the voltage between ECM harness connector and
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Is the inspection result normal?
YES >> GO TO 4.
NO >> G NISSAN LATIO 2010 Service Repair Manual FUEL PUMPEC-429
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4. Check the voltage between ECM harness connector and
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Is the inspection result normal?
YES >> GO TO 4.
NO >> G](/manual-img/5/57358/w960_57358-1693.png)
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4. Check the voltage between ECM harness connector and
ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect IDPDM E/R harness connector E46.
3. Turn ignition switch ON.
4. Check the voltage between IPDM E/R harness connector and ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> GO TO 10.
3.DETECT MALFUNCTIONING PART
Check the following.
• Harness or connectors E8, F8.
• Harness for open or short between ECM and IPDM E/R
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Disconnect “fuel level sensor unit and fuel pump” harness connector.
4. Turn ignition switch ON.
5. Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 5.
5.CHECK FUSE
1. Turn ignition switch OFF.
2. Disconnect 15 A fuse (No. 48) from IPDM E/R.
3. Check 15 A fuse.
Is the inspection result normal?
YES >> GO TO 6.
ECM GroundVoltage
Connector Terminal
F10 23 Ground Battery voltage
PBIA9573J
IPDM E/R
GroundVoltage
Connector Terminal
E46 47 Ground Battery voltage
PBIB3319E
Fuel level sensor unit
and fuel pump Ground Voltage
Connector Terminal
B100 1 Ground Battery voltage should exist 1 second
after ignition switch is turn ON.
PBIB0795E
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< COMPONENT DIAGNOSIS >[HR16DE]
FUEL PUMP
NO >> Replace15 A fuse.
6.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV
1. Disconnect IPDM E/R harness connector E45.
2. Check the continuity between IPDM E/ NISSAN LATIO 2010 Service Repair Manual EC-430
< COMPONENT DIAGNOSIS >[HR16DE]
FUEL PUMP
NO >> Replace15 A fuse.
6.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV
1. Disconnect IPDM E/R harness connector E45.
2. Check the continuity between IPDM E/](/manual-img/5/57358/w960_57358-1694.png)
EC-430
< COMPONENT DIAGNOSIS >[HR16DE]
FUEL PUMP
NO >> Replace15 A fuse.
6.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV
1. Disconnect IPDM E/R harness connector E45.
2. Check the continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel pump”
harness connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 7.
7.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E7, M69
• Harness connectors M12, B101
• Harness for open or short between IPDM E/R and “fuel level sensor unit and fuel pump”
>> Repair open circuit or short to power in harness or connectors.
8.CHECK FUEL PUMP GROUND CIRCUIT
1. Check the continuity between “fuel le vel sensor unit and fuel pump” and ground.
2. Also heck harness for short to power.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Repair open circuit or short to power in harness or connectors.
9.CHECK FUEL PUMP
Refer to EC-430, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Replace “fuel level sensor unit and fuel pump”.
10.CHECK INTERMITTENT INCIDENT
Refer to EC-114, "
Diagnosis Procedure".
Is the inspection result normal?
YES >> Replace IPDM E/R.
NO >> Repair or replace harness or connectors.
Component InspectionINFOID:0000000005398613
1.CHECK FUEL PUMP
1. Turn ignition switch OFF.
2. Disconnect “fuel level sensor uni t and fuel pump” harness connector.
IPDM E/RFuel level sensor unit and
fuel pump Continuity
Connector Terminal Connector Terminal
E45 36 B100 1 Existed
Fuel level sensor unit and fuel pump Ground Continuity
Connector Terminal
B100 3 Ground Existed
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3. Check resistance between “fuel level sensor unit and fuel pump”
terminals as per the following.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace “fuel level sensor unit and fuel pump”.
Terminals Resistance
1 and 3 0.2 - 5.0 Ω [at 25°C (77 °F)]
SEC918C
Revision: January 20102010 Versa