Nissan Pathfinder (2012 year). Manual - part 290

ELECTRICAL LOAD SIGNAL

EC-401

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

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EC

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>>

INSPECTION END

August 2012

2012 Pathfinder

EC-402

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

FUEL INJECTOR

FUEL INJECTOR

Component Description

INFOID:0000000007358369

The fuel injector is a small, precise solenoid valve. When the ECM

supplies a ground to the fuel injector, the coil in the fuel injector 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 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.

Diagnosis Procedure

INFOID:0000000007358370

1.

INSPECTION START

Turn ignition switch to START.

Are any cylinders ignited?

Yes or No

Yes (With CONSULT)>>GO TO 2.

Yes (Without CONSULT)>>GO TO 3.

No

>> GO TO 7.

2.

CHECK OVERALL FUNCTION

 

With CONSULT

1. Start engine.

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

3. Make sure that each circuit produces a momentary engine speed drop.

OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 7.

3.

CHECK FUNCTION OF FUEL INJECTOR-I

 

Without CONSULT

1. Stop engine.

2. Disconnect harness connector F44 (3), F201 (1)

3. Turn ignition switch ON.

SEF375Z

2

: Vacuum tank

: Front

AWBIA0686ZZ

August 2012

2012 Pathfinder

FUEL INJECTOR

EC-403

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4. Check voltage between harness connector F44 terminal 3 and

ground with CONSULT or tester.

5. Turn ignition switch OFF.

6. Disconnect ECM harness connector.

7. Check harness continuity between harness connector F44 and

ECM as follows.

Refer to Wiring Diagram.

8. Also check harness for short to ground and short to power.
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 harness connector E119

• 15 A fuse (No.55)

• Harness for open or short between harness connector F44 and fuse

• Harness for open or short between harness connector F201 and fuel injector

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

5.

CHECK FUNCTION OF FUEL INJECTOR-II

Provide battery voltage between harness connector F201 as follows

and then interrupt it. Listen to each fuel injector operating sound.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 7.

6.

CHECK FUNCTION OF FUEL INJECTOR-III

1. Reconnect all harness connector disconnected.

2. Start engine.

Voltage: Battery voltage

Cylinder

Harness connector F44 

terminal

ECM terminal

1

2

23

3

1

22

5

4

21

Continuity should exist.

PBIB2633E

Cylinder

Harness connector F201 terminal

(+)

(–)

1

3

2

3

3

1

5

3

4

Operating sound should exist.

PBIB2634E

August 2012

2012 Pathfinder

EC-404

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

FUEL INJECTOR

3. Listen to fuel injectors No. 2, No. 4, No.6 operating sound.

OK or NG

OK

>>

INSPECTION END

NG

>> GO TO 7.

7.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

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

CONSULT or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• Harness connectors F44, F201

• IPDM E/R harness connector E119

• 15 A fuse (No.55)

• Harness for open or short between fuel injector and fuse

>> Repair harness or connectors.

9.

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. 

Refer to Wiring Diagram.

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

Clicking noise should exist.

PBIB1986E

BBIA0546E

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

August 2012

2012 Pathfinder

FUEL INJECTOR

EC-405

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[VQ40DE]

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OK

>> GO TO 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F201, F44

• 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.

11.

CHECK FUEL INJECTOR

Refer to 

EC-405, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel injector. Refer to 

EM-47, "Removal and Installation"

.

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358371

FUEL INJECTOR

1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.

Resistance: 11.1 - 14.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

August 2012

2012 Pathfinder

EC-406

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000007358372

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:0000000007358373

1.

CHECK OVERALL FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose with two fingers.

Fuel pressure pulsation should be felt on the fuel feed hose

for 1 second after ignition switch is turned ON.

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.

PBIB1569E

BBIA0563E

August 2012

2012 Pathfinder

FUEL PUMP

EC-407

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4. Check voltage between ECM terminal 113 and ground with

CONSULT 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 or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 12.

4.

DETECT MALFUNCTIONING PART

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

>> Repair harness or connectors.

5.

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 con-

nector.

4. Turn ignition switch ON.

5. Check voltage between “fuel level sensor unit and fuel pump”

terminal 1 and ground with CONSULT or tester. 

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

OK

>> GO TO 9.

NG

>> GO TO 6.

6.

CHECK 15A FUSE

1. Turn ignition switch OFF.

Voltage: Battery voltage 

PBIB1187E

Voltage: Battery voltage

PBIB2656E

BBIA0545E

Voltage:

Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.

PBIB0795E

August 2012

2012 Pathfinder

EC-408

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE]

FUEL PUMP

2. Disconnect 15A fuse. For the fuse arrangement, refer to 

PG-75, "IPDM E/R Terminal Arrangement"

.

3. Check 15 A fuse (No.48).
OK or NG

OK

>> GO TO 7.

NG

>> Replace fuse.

7.

CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV

1. Disconnect IPDM E/R harness connector E119.

2. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 1 and IPDM E/R termi-

nal 13.

Refer to Wiring Diagram. 

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

OK

>> GO TO 12.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors C1, E41

• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R

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

9.

CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.

Refer to Wiring Diagram.

2. Also check harness for short to ground.
OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors C1, E41

• Harness for open or short between “fuel level sensor unit and fuel pump” and ground

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

11.

CHECK FUEL PUMP

Refer to 

EC-409, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel pump. Refer to 

FL-11, "Removal and Installation"

.

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R. Refer to 

PCS-29, "Removal and Installation of IPDM E/R"

.

NG

>> Repair or replace harness or connectors.

Continuity should exist.

Continuity should exist.

August 2012

2012 Pathfinder