Nissan Pathfinder (2008 year). Manual - part 343

COOLING FAN

EC-861

< COMPONENT DIAGNOSIS >

[VK56DE]

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1.

Disconnect cooling fan motor (1) harness connector.

2.

Check harness continuity between the following;
cooling fan motor terminal 1 and IPDM E/R terminal 20,
cooling fan motor terminal 2 and IPDM E/R terminal 24.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

5.

CHECK COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT

1.

Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

NG

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

6.

CHECK COOLING FAN MOTOR

Refer to 

EC-861, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace cooling fan motor.

7.

CHECK INTERMITTENT INCIDENT

Perform 

GI-51, "Intermittent Incident"

.

OK or NG

OK

>> INSPETION END

NG

>> Repair or replace harness or connector. 

Component Inspection

INFOID:0000000001559414

COOLING FAN MOTOR

1.

Disconnect cooling fan motor harness connectors.

2.

Supply cooling fan motor terminals with battery voltage and
check operation.

Cooling fan motor should operate.
If NG, replace cooling fan motor.

Continuity should exist.

ALBIA0355ZZ

Continuity should exist.

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Low

1

3 and 4

2

3 and 4

High

1 and 2

3 and 4

SEF734W

EC-862

< COMPONENT DIAGNOSIS >

[VK56DE]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000001537995

The electrical load signal (Headlamp switch signal, etc.) is transferred through the CAN communication line
from BCM to ECM via IPDM E/R.

Diagnosis Procedure

INFOID:0000000001537996

1.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I

1.

Turn ignition switch ON.

2.

Connect CONSULT-III and select “DATA MONITOR” mode.

3.

Select “LOAD SIGNAL” and check indication under the following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

2.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II

Check “LOAD SIGNAL” indication under the following conditions.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 5.

3.

CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION

Select “HEATER FAN SW” and check indication under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

4.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to 

DEF-34, "Filament Check"

.

>> INSPECTION END

5.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-21, "EXTERNAL LAMP : CONSULT-III Function"

.

>> INSPECTION END

6.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-106, "Symptom Matrix Chart"

.

Condition

Indication

Rear window defogger switch: ON

ON

Rear window defogger switch: OFF

OFF

Condition

Indication

Lighting switch: ON at 2nd position

ON

Lighting switch: OFF

OFF

Condition

Indication

Heater fan control switch: ON

ON

Heater fan control switch: OFF

OFF

ELECTRICAL LOAD SIGNAL

EC-863

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>> INSPECTION END

EC-864

< COMPONENT DIAGNOSIS >

[VK56DE]

FUEL INJECTOR

FUEL INJECTOR

Component Description

INFOID:0000000001537997

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:0000000001537998

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder 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.

Make sure 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

FUEL INJECTOR

EC-865

< COMPONENT DIAGNOSIS >

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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
• 15A fuse
• 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-865, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning fuel injector.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-51, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001537999

FUEL INJECTOR

1.

Disconnect fuel injector harness connector.

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

EC-866

< COMPONENT DIAGNOSIS >

[VK56DE]

FUEL INJECTOR

2.

Check resistance between terminals as shown in the figure.

Resistance: 11.1 - 14.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E

FUEL PUMP

EC-867

< COMPONENT DIAGNOSIS >

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FUEL PUMP

Description

INFOID:0000000001538000

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.

Diagnosis Procedure

INFOID:0000000001538001

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

EC-868

< COMPONENT DIAGNOSIS >

[VK56DE]

FUEL PUMP

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 15A FUSE

1.

Turn ignition switch OFF.

2.

Disconnect 15A fuse.

3.

Check 15A 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