Nissan Altima L32. Instruction — part 458

COOLING FAN

EC-953

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

3. Supply cooling fan motor terminals with battery voltage and

check operation.

Check that cooling fan speed of condition B is higher than that of A.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace cooling fan motor.

Component Inspection (Cooling Fan Relay)

INFOID:0000000004349944

1.

CHECK COOLING FAN RELAYS

1. Turn ignition switch OFF.

2. Remove cooling fan relay-2, -3.

3. Check the continuity between cooling fan relay-2, -3 terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace cooling fan relay.

Condition

Terminals

+

−

Cooling fan motor

A

1

3 and 4

2

3 and 4

1 and 2

3

1 and 2

4

B

1, 2

3, 4

SEF734W

Terminals

Conditions

Continuity

3 and 5

12V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

6 and 7

12V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

PBIB0439E

EC-954

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000004349945

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred

through the CAN communication line.

Component Function Check

INFOID:0000000004349946

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-954, "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-954, "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-954, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349947

1.

INSPECTION START

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

EC-954, "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-6, "System Diagram"

.

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

ELECTRICAL LOAD SIGNAL

EC-955

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to

EXL-7, "System Diagram"

(XENON TYPE) or

EXL-9, "System Diagram"

(HALOGEN TYPE).

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to

HAC-42, "Diagnosis Procedure"

(automatic air conditioner) or

HAC-127, "Diagnosis Procedure"

(instruction air conditioner).

>> INSPECTION END

EC-956

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

FUEL INJECTOR

FUEL INJECTOR

Description

INFOID:0000000004349948

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:0000000004349949

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

YES

>> GO TO 2.

NO

>> Go to

EC-956, "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. Make sure that each circuit produces a momentary engine speed drop.

Without CONSULT-III

1. Let engine idle.

2. Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to

EC-956, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004349950

1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

PBIA9664J

Clicking noise should be heard.

PBIB3332E