Infiniti EX35. Manual - part 676

EC-446

< COMPONENT DIAGNOSIS >

[VQ35HR]

COOLING FAN

2.

Disconnect cooling fan control module harness connectors E301, E302.

3.

Supply cooling fan control module harness connector terminals with battery voltage and check operation.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace cooling fan motor.

Component Inspection (Cooling Fan Relay)

INFOID:0000000003133629

1.

CHECK COOLING FAN RELAY

1.

Turn ignition switch OFF.

2.

Remove cooling fan relay.

3.

Check the continuity between cooling fan relay terminals under
the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace cooling fan relay.

Cooling fan control module

Operation

Motor

Connector

Terminal

(+)

(–)

1

E301

4

5

Cooling fan operates.

2

E302

6

7

Terminals

Conditions

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

SEF090M

ELECTRICAL LOAD SIGNAL

EC-447

< COMPONENT DIAGNOSIS >

[VQ35HR]

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ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000003133630

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred
through the CAN communication line.

Component Function Check

INFOID:0000000003133631

1.

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

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.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-447, "Diagnosis Procedure"

.

2.

CHECK LIGHTING SWITCH FUNCTION

Check “LOAD SIGNAL” indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

EC-447, "Diagnosis Procedure"

.

3.

CHECK HEATER FAN CONTROL SWITCH FUNCTION

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-447, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003133632

1.

INSPECTION START

Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to 

EC-447, "Compo-

nent Function Check"

.

Which circuit is related to the incident?

Rear window defogger>>GO TO 2.
Headlamp>>GO TO 3.
Heater fan>>GO TO 4.

2.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to 

DEF-3, "Work Flow"

Monitor item

Condition

Indication

LOAD SIGNAL

Rear window defogger switch

ON

ON

OFF

OFF

Monitor item

Condition

Indication

LOAD SIGNAL

Lighting switch

ON at 2nd position

ON

OFF

OFF

Monitor item

Condition

Indication

HEATER FAN SW

Heater fan control switch

ON

ON

OFF

OFF

EC-448

< COMPONENT DIAGNOSIS >

[VQ35HR]

ELECTRICAL LOAD SIGNAL

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-7, "Work Flow"

 (XENON TYPE) or 

EXL-210, "Work Flow"

 (HALOGEN TYPE).

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-5, "Work Flow"

.

>> INSPECTION END

FUEL INJECTOR

EC-449

< COMPONENT DIAGNOSIS >

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FUEL INJECTOR

Description

INFOID:0000000003133633

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.

Component Function Check

INFOID:0000000003133634

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

YES

>> GO TO 2.

NO

>> Go to 

EC-449, "Diagnosis Procedure"

.

2.

CHECK FUEL INJECTOR 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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-449, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000003133635

1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between fuel injector harness connector and ground.

SEF375Z

Clicking sound should be heard.

PBIB3332E