Nissan Frontier. Manual - part 693

COOLING FAN

EC-1343

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

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F

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EC

N

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4.

CHECK COOLING FAN MOTOR

Refer to 

EC-1343, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace cooling fan motor. Refer to 

CO-47, "Exploded View"

.

5.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> INSPETION END

NG

>> Repair or replace harness or connector. 

Component Inspection

INFOID:0000000009482028

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.

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-1344

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000009482029

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:0000000009482030

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-142, "Symptom Matrix Chart"

 (Type 1) or 

HAC-208, "Symptom Matrix Chart"

 (Type 2).

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-1345

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

EC-1346

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

FUEL INJECTOR

FUEL INJECTOR

Component Description

INFOID:0000000009482031

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:0000000009482032

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