Nissan Altima L32. Instruction — part 334

COOLING FAN

EC-457

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• 10 A fuse (No. 33)

• 40 A fusible link (letter K)

• IPDM E/R harness connector E18

• Harness for open or short between cooling fan relay-2 and battery

• Harness for open or short between cooling fan relay-3 and battery

• Harness for open or short between cooling fan relay-2 and IPDM E/R

• Harness for open or short between cooling fan relay-3 and IPDM E/R

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

3.

CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connectors.

3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connec-

tor.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness for open or short between cooling fan relay-2 and IPDM E/R

• Harness for open or short between cooling fan relay-3 and IPDM E/R

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

5.

CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT

1. Disconnect cooling fan motor-1 harness connector.

2. Check the voltage between cooling fan motor-1 harness con-

nector and ground.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• 40 A fusible link (letter M)

• Harness connector E12, E203

Cooling fan relay

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E42

(cooling fan relay-2)

1

E17

42

Existed

E43

(cooling fan relay-3)

1

E18

34

Cooling fan motor-1

Ground

Voltage

Connector

Terminal

E220

1

Ground

Battery voltage

2

PBIB1670E

EC-458

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

COOLING FAN

• Harness for open or short between cooling fan motor-1 and battery

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

7.

CHECK COOLING FAN MOTOR CIRCUIT-I

1. Disconnect cooling fan motor-2 harness connector.

2. Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 har-

ness connectors.

3. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connector E12, E203

• Harness for open or short between cooling fan motor-1 and cooling fan relay-2

• Harness for open or short between cooling fan motor-1 and cooling fan relay-3

• Harness for open or short between cooling fan motor-2 and cooling fan relay-2

• Harness for open or short between cooling fan motor-2 and cooling fan relay-3

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

9.

CHECK COOLING FAN MOTOR CIRCUIT-II

1. Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connec-

tor.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connector E12, E203

• Harness for open or short between cooling fan motor-1 and IPDM E/R

• Harness for open or short between cooling fan motor-2 and IPDM E/R

Cooling fan relay

Cooling fan motor

Continuity

Connector

Terminal

Connector

Terminal

E42

(cooling fan relay-2)

3

E221

(Cooling fan motor-2)

2

Existed

7

E220

(Cooling fan motor-1)

3

E43

(cooling fan relay-3)

3

E221

(Cooling fan motor-2)

1

7

E220

(Cooling fan motor-1)

4

IPDM E/R

Cooling fan motor

Continuity

Connector

Terminal

Connector

Terminal

E18

35

E220

(Cooling fan motor-1)

4

Existed

38

E221

(Cooling fan motor-2)

1

COOLING FAN

EC-459

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

11.

CHECK COOLING FAN MOTOR CIRCUIT-III

1. Check the continuity between cooling fan relay-2, -3 harness connectors and ground.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 12.

NO

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

12.

CHECK COOLING FAN MOTOR CIRCUIT-IV

1. Check the continuity between cooling fan motor-2 harness connector and ground.

2. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 13.

NO

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

13.

CHECK COOLING FAN RELAY-2 AND -3

Refer to

EC-460, "Component Inspection (Cooling Fan Relay)"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace malfunctioning cooling fan relay.

14.

CHECK COOLING FAN MOTORS-1 AND -2

Refer to

EC-459, "Component Inspection (Cooling Fan Motor)"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace malfunctioning cooling fan motor.

15.

CHECK INTERMITTENT INCIDENT

Perform

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace harness connectors.

Component Inspection (Cooling Fan Motor)

INFOID:0000000004349519

1.

CHECK COOLING FAN MOTOR

1. Turn ignition switch OFF.

2. Disconnect cooling fan motor harness connector.

Cooling fan motor

Ground

Continuity

Connector

Terminal

E42

(cooling fan relay-2)

6

Ground

Existed

E43

(cooling fan relay-3)

6

Cooling fan motor-2

Ground

Continuity

Connector

Terminal

E221

3

Ground

Existed

4

EC-460

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

COOLING FAN

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:0000000004349520

1.

CHECK COOLING FAN RELAYS

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.

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