Infiniti FX35 / FX45. Manual - part 449

FUEL INJECTOR

EC-557

< SERVICE INFORMATION >

[VQ35DE]

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3.

Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42. 
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F251, F50
• Harness for open or short between fuel injector and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

10.

CHECK FUEL INJECTOR

Refer to 

EC-557, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace malfunctioning fuel injector.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> INSPECTION END

Component Inspection

INFOID:0000000001326442

FUEL INJECTOR

1.

Disconnect fuel injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Removal and Installation

INFOID:0000000001326443

FUEL INJECTOR

Refer to 

EM-45

.

Continuity should exist.

Resistance: 11.1 - 14.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

EC-558

< SERVICE INFORMATION >

[VQ35DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000001326444

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 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.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001326445

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.

PBIB1569E

MONITOR ITEM

CONDITION

SPECIFICATION

FUEL PUMP RLY

• For 1 second after turning ignition switch ON
• Engine running or cranking

ON

• Except above conditions

OFF

FUEL PUMP

EC-559

< SERVICE INFORMATION >

[VQ35DE]

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Wiring Diagram

INFOID:0000000001326446

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1409E

EC-560

< SERVICE INFORMATION >

[VQ35DE]

FUEL PUMP

Diagnosis Procedure

INFOID:0000000001326447

1.

CHECK OVERALL FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose with two fingers.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between ECM terminal 113 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector E8.

3.

Check harness continuity between IPDM E/R terminal 40 and ECM terminal 113.
Refer to Wiring Diagram. 

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

113

GY/R

Fuel pump relay

[Ignition switch: ON]
• For 1 second after turning ignition switch ON
[Engine is running]

0 - 1.5V

[Ignition switch: ON]
• More than 1 second after turning ignition 

switch ON

BATTERY VOLTAGE
(11 - 14V)

Fuel pressure pulsation should be felt on the fuel feed 
hose for 1 second after ignition switch is turned ON.

PBIB1612E

Voltage: Battery voltage 

PBIB1187E

Continuity should exist.