NISSAN LATIO 2010 Service Repair Manual

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 PUMPEC-427
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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.
ALBIA0276ZZ
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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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FUEL PUMPEC-429
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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
Revision: January 20102010 Versa

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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FUEL PUMPEC-431
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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
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EC-432
< COMPONENT DIAGNOSIS >[HR16DE]
IGNITION SIGNAL
IGNITION SIGNAL
DescriptionINFOID:0000000005398614
The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns
ON and OFF the ignition coil primary circuit. This ON/O
FF operation induces the proper high voltage in the coil
secondary circuit.
Component Function CheckINFOID:0000000005398615
1.INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engine start?
YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO >> Go to EC-434, "
Diagnosis Procedure".
2.IGNITION SIGNAL FUNCTION
With CONSULT-III
1. Perform “POWER BALANCE” in “A CTIVE TEST” mode with CONSULT-III.
2. Make sure that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-434, "
Diagnosis Procedure".
3.IGNITION SIGNAL FUNCTION
Without CONSULT-III
1. Let engine idle.
2. Read the voltage signal between ECM harness connector and
ground.
NOTE:
The pulse cycle changes depending on rpm at idle.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-434, "
Diagnosis Procedure".
ECM Ground Voltage signal
Connector Terminal
F10 17
Ground
18
21
22
PBIA9567J
PBIA9265J
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IGNITION SIGNALEC-433
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Wiring DiagramINFOID:0000000005398616
BBWA2658E
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EC-434
< COMPONENT DIAGNOSIS >[HR16DE]
IGNITION SIGNAL
Diagnosis Procedure
INFOID:0000000005398617
1.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
BBWA2659E
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IGNITION SIGNALEC-435
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2. Check the voltage between ECM harness connector and
ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to EC-115, "
Diagnosis Procedure".
2.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser-2 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between condenser-2 harness connector and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> GO TO 3.
3.CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector E43.
3. Check the continuity between IPDM E/R harness connector and condenser-2 harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> Go to EC-115, "Diagnosis Procedure".
NO >> GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E8, F8
• IPDM E/R harness connector E43
• Harness for open or short between IPDM E/R and condenser-2
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK CONDENSER-2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between condenser-2 harness connector and ground.
ECM Ground Voltage
Connector Terminal
E16 105 Ground Battery voltage
PBIA9575J
Condenser-2
Ground Voltage
Connector Terminal
F26 1 Ground Battery voltage
PBIB0624E
IPDM E/R Condenser-2
Continuity
Connector Terminal Connector Terminal
E43 3F26 1 Existed
Condenser-2
Ground Continuity
Connector Terminal
F26 2Ground Existed
Revision: January 20102010 Versa