Nissan Pathfinder (2012 year). Manual - part 355

COOLING FAN

EC-921

< DTC/CIRCUIT DIAGNOSIS >

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COOLING FAN

Description

INFOID:0000000007358838

COMPONENT DESCRIPTION

Cooling Fan Motor

The cooling fan operates at each speed when the current flows in the cooling fan motor as per the following.

Diagnosis Procedure

INFOID:0000000007358839

1.

CHECK IPDM E/R POWER SUPPLY AND GROUND CIRCUIT

Refer to 

PCS-14, "Diagnosis Procedure"

.

OK or NG

OK

>> GO TO 2.

NG

>> Follow the instructions on 

PCS-14, "Diagnosis Procedure"

.

2.

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector E120.

3. Disconnect cooling fan motor (1) harness connector.

4. Check harness continuity between the following terminals;

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.

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

OK

>> GO TO 3.

NG

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

in harness or connectors.

3.

CHECK COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT

1. Check harness continuity between the following terminals;

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 4.

NG

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

4.

CHECK COOLING FAN MOTOR

Refer to 

EC-922, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Low (LOW)

1

3 and 4

2

3 and 4

High (HI)

1 and 2

3 and 4

Continuity should exist.

ALBIA0355ZZ

Continuity should exist.

August 2012

2012 Pathfinder

EC-922

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

COOLING FAN

NG

>> Replace cooling fan motor. Refer to 

CO-49, "Exploded View"

.

5.

CHECK INTERMITTENT INCIDENT

Perform 

GI-37, "Intermittent Incident"

.

OK or NG

OK

>> INSPETION END

NG

>> Repair or replace harness or connector. 

Component Inspection

INFOID:0000000007358840

COOLING FAN MOTOR

1. Disconnect cooling fan motor harness connector.
2. Supply cooling fan motor terminals with battery voltage and

check operation.

Cooling fan motor should operate.

If NG, replace cooling fan motor. Refer to 

CO-49, "Exploded View"

.

Cooling fan speed

Cooling fan motor terminals

(+)

(

−

)

Low

1

3 and 4

2

3 and 4

High

1 and 2

3 and 4

SEF734W

August 2012

2012 Pathfinder

ELECTRICAL LOAD SIGNAL

EC-923

< DTC/CIRCUIT DIAGNOSIS >

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ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000007358841

The electrical load signal (Headlamp switch signal, etc.) is transferred via the CAN communication line.

Diagnosis Procedure

INFOID:0000000007358842

1.

CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I

1. Turn ignition switch ON.

2. Connect CONSULT 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-3, "Repair Work Flow"

.

>>

INSPECTION END

5.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-4, "Work Flow"

.

>>

INSPECTION END

6.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-4, "How to Perform Trouble Diagnosis For Quick And Accurate Repair"

 or 

HAC-128, "How to

Perform Trouble Diagnosis For Quick And Accurate Repair"

.

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

August 2012

2012 Pathfinder

EC-924

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

ELECTRICAL LOAD SIGNAL

>>

INSPECTION END

August 2012

2012 Pathfinder

FUEL INJECTOR

EC-925

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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FUEL INJECTOR

Component Description

INFOID:0000000007358843

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:0000000007358844

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

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.

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

August 2012

2012 Pathfinder

EC-926

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL INJECTOR

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

CONSULT 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-926, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning fuel injector. Refer to 

EM-180

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-37, "Intermittent Incident"

.

>>

INSPECTION END

Component Inspection

INFOID:0000000007358845

FUEL INJECTOR

1. Disconnect fuel injector harness connector.

Voltage: Battery voltage

PBIB0582E

Continuity should exist.

August 2012

2012 Pathfinder

FUEL INJECTOR

EC-927

< DTC/CIRCUIT DIAGNOSIS >

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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

August 2012

2012 Pathfinder

EC-928

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000007358846

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:0000000007358847

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

August 2012

2012 Pathfinder