Nissan Pathfinder (2011 year). Manual - part 357

EC-910

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ELECTRICAL LOAD SIGNAL

>>

INSPECTION END

2011 Pathfinder

FUEL INJECTOR

EC-911

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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FUEL INJECTOR

Component Description

INFOID:0000000006244609

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 through the fuel injector into the intake manifold.

The amount of fuel injected depends upon the injection pulse dura-

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

open. The ECM controls the injection pulse duration based on

engine fuel needs.

Diagnosis Procedure

INFOID:0000000006244610

1.

INSPECTION START

Turn ignition switch to START.

Are any cylinders ignited?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2.

CHECK OVERALL FUNCTION

 

With CONSULT-III

1.  Start engine.

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

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

 

Without CONSULT-III

1. Start engine.

2. Listen to each fuel injector operating sound.

Clicking noise should be heard.

OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 3.

3.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

SEF375Z

PBIB1986E

BBIA0374E

2011 Pathfinder

EC-912

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL INJECTOR

4. Check voltage between fuel injector terminal 1 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

 Check the following.

• Harness connectors E2, F32

• IPDM E/R connector E119

• 15 A fuse (No. 55)

• Harness for open or short between fuel injector and fuse

>> Repair 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 fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42, 44,

63. 

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.

6.

CHECK FUEL INJECTOR

Refer to 

EC-912, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning fuel injector. Refer to 

EM-181

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000006244611

FUEL INJECTOR

1. Disconnect fuel injector harness connector.

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

2011 Pathfinder

FUEL INJECTOR

EC-913

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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2. Check resistance between terminals as shown in the figure.

Resistance: 11.1 - 14.5 

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

2011 Pathfinder

EC-914

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000006244612

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.

Diagnosis Procedure

INFOID:0000000006244613

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.

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.

BBIA0529E

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

ALBIA0356ZZ

2011 Pathfinder

FUEL PUMP

EC-915

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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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

Check voltage between IPDM E/R terminal 46 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 9.

4.

DETECT MALFUNCTIONING PART

Check harness for open or short between IPDM E/R and ECM.

>> Repair harness or connectors.

5.

CHECK FUSE

1. Turn ignition switch OFF.

2. Disconnect 15 A fuse (No. 48).

3. Check 15 A fuse.
OK or NG

OK

>> GO TO 6.

NG

>> Replace fuse.

6.

CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect “fuel level sensor unit and fuel pump” harness con-

nector.

3. Disconnect IPDM E/R harness connector E119.

4. Check harness continuity between IPDM E/R terminal 13 and

“fuel level sensor unit and fuel pump” terminal 1, “fuel level sen-

sor unit and fuel pump” terminal 3 and ground.

Refer to Wiring Diagram. 

5. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E41, C1

• Harness for open or short between fuel pump and IPDM E/R

Voltage: Battery voltage 

PBIB1187E

Voltage: Battery voltage

PBIB2656E

Continuity should exist.

BBIA0545E

2011 Pathfinder

EC-916

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL PUMP

• Harness for open or short between fuel pump and ground

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

8.

CHECK FUEL PUMP

Refer to 

EC-916, "Component Inspection"

.

OK or NG

OK

>> GO TO 9.

NG

>> Replace “fuel level sensor unit and fuel pump”. Refer to 

FL-11

.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R. Refer to 

PCS-29

.

NG

>> Repair or replace harness or connectors.

Component Inspection

INFOID:0000000006244614

FUEL PUMP

1. Disconnect “fuel level sensor unit and fuel pump” harness connector.
2. Check resistance between fuel level sensor unit and fuel pump

terminals 1 and 3.

Resistance: 0.2 - 5.0 

Ω

 [at 25

°

C (77

°

F)]

SEC918C

2011 Pathfinder

IGNITION SIGNAL

EC-917

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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IGNITION SIGNAL

Component Description

INFOID:0000000006244615

IGNITION COIL & POWER TRANSISTOR

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/OFF operation induces the proper high voltage in the coil

secondary circuit.

Diagnosis Procedure

INFOID:0000000006244616

1.

CHECK ENGINE START

Turn ignition switch OFF, and restart engine.

Is engine running?

Yes or No

Yes (With CONSULT-III)>>GO TO 2.

Yes (Without CONSULT-III)>>GO TO 3.

No

>> GO TO 4.

2.

CHECK OVERALL FUNCTION

 

With CONSULT-III

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

2. Check that each circuit produces a momentary engine speed drop.
OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 10.

3.

CHECK OVERALL FUNCTION

 Without CONSULT-III

1. Let engine idle.

2. Read the voltage signal between ECM terminals 46, 60, 61, 62,

65, 79, 80, 81 and ground with an oscilloscope.

3. Check that the oscilloscope screen shows the signal wave as

shown below.

NOTE:

The pulse cycle changes depending on rpm at idle.

1.

Ignition coils (with power transistor) 
(bank 2)

2.

Ignition coils (with power transistor) 
(bank 1)

: Vehicle front

ALBIA0370ZZ

PBIB2094E

PBIB0044E

2011 Pathfinder