Infiniti M35/M45 Y50. Manual - part 730

FUEL INJECTOR

EC-1393

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EC

3. 

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connectors.

3.

Turn ignition switch ON.

4.

Check voltage between fuel injector terminal 1 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M72, F102

●

Fuse block (J/B) connector M4

●

15A 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 ECM terminals 21, 22, 23, 40, 41, 42, 44, 63 and fuel injector terminal
2. 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.

: Vehicle front

1.

Fuel injector (bank 2)

2.

Fuel injector (bank 1)

Voltage: Battery voltage

PBIB2693E

PBIB0582E

Continuity should exist.

EC-1394

[VK45DE]

FUEL INJECTOR

6. 

CHECK FUEL INJECTOR

Refer to 

EC-1394, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace fuel injector.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS005PZ

FUEL INJECTOR

1.

Disconnect fuel injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Removal and Installation

NBS005Q0

FUEL INJECTOR

Refer to 

EM-193, "FUEL INJECTOR AND FUEL TUBE"

 .

Resistance: 13.5 - 17.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

FUEL PUMP

EC-1395

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FUEL PUMP

PFP:17042

Description

NBS005Q1

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 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 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)

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Fuel pressure regulator (2)

●

Fuel tank temperature sensor (3)

CONSULT-II Reference Value in Data Monitor Mode

NBS005Q2

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.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

PBIB2707E

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

●

For 1 seconds after turning ignition switch: ON

●

Engine running or cranking

ON

●

Except above

OFF

EC-1396

[VK45DE]

FUEL PUMP

Wiring Diagram

NBS005Q3

TBWT1506E