Nissan Maxima. Manual - part 503

 

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Nissan Maxima. Manual - part 503

 

 

EC-496

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

FUEL INJECTOR

FUEL INJECTOR

Description

INFOID:0000000010095213

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 via the fuel injector into the intake manifold. The

amount of fuel injected depends upon the injection pulse duration.

Pulse duration is the length of time the fuel injector remains open.

The ECM controls the injection pulse duration based on engine fuel

needs.

Component Function Check

INFOID:0000000010095214

1.

INSPECTION START

Turn ignition switch to START.
Are any cylinders ignited?

YES

>> GO TO 2.

NO

>> Go to 

EC-496, "Diagnosis Procedure"

.

2.

CHECK FUEL INJECTOR FUNCTION

With CONSULT

1. Start engine.

2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.

3. Check that each circuit produces a momentary engine speed drop.

Without CONSULT

1. Start engine.

2. Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-496, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095215

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

PBIA9664J

Clicking sound should be heard.

PBIB3332E

FUEL INJECTOR

EC-497

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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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.

• 10 A fuse (No. 35)

• IPDM E/R harness connector E10

• Harness for open or short between fuel injector and fuse

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

4.

CHECK FUEL INJECTOR

Refer to 

EC-498, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning fuel injector. Refer to 

EM-43, "Removal and Installation"

.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-35, "Removal and Installation"

.

NO

>> INSPECTION END

Fuel injector

Ground

Voltage

Cylinder

Connector

Terminal

1

F17

1

Ground

Battery voltage

2

F18

1

3

F19

1

4

F20

1

5

F21

1

6

F22

1

PBIB0582E

Fuel injector

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F17

2

F14

32

Existed

2

F18

2

31

3

F19

2

30

4

F20

2

29

5

F21

2

3

6

F22

2

1

EC-498

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

FUEL INJECTOR

Component Inspection

INFOID:0000000010095216

1.

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

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. Refer to 

EM-43,

"Removal and Installation"

.

Terminals

Resistance

1 and 2

11.1 - 14.5 

Ω [at 10 - 60°C (50 - 140°F)]

PBIB1727E

FUEL PUMP

EC-499

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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FUEL PUMP

Description

INFOID:0000000010095217

*: 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 Function Check

INFOID:0000000010095218

1.

CHECK FUEL PUMP FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose with two fingers.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>

EC-499, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010095219

Regarding Wiring Diagram information, refer to 

EC-554, "Wiring Diagram"

.

1.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

Sensor

Input signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

Fuel pump control

Fuel 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

Stops.

: Vehicle front (Illustration shows 

the view with intake air duct re-
moved)

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

ALBIA0612ZZ

 

 

 

 

 

 

 

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