1995 NISSAN ALMERA N15 relay

TROUBLEDIAGNOSES
Cooling FanControl
SYSTEM DESCRIPTION

Vehicle speedsensor Vehicle
speed
Engine coolant temperature sensorEngine
coolant temperature
ECM

(Engine
control module) Cooling
fan
relay(s)
Air conditioner switch Air
conditioner "ON"signal

The ECM controls thecooling fancorresponding tothe vehicle speed,engine coolant temperature, air
conditioner systempressure andairconditioner ONsignal. Thecontrol system has3-step control

[HIGH/LOW/OFF].
Operation
SEF953P
20
80

(12) (50)

Vehicle speedkmfh(MPH)
~ :Cooling fansoperate at"High" speed.

Air
conditioner switchIs"ON".

100 (212)
95 (203)
90 (194)

~LL

:J
0

eZ;
~o

E

2

C

'"

'0

o

U

Q>

c

'5>
c

w

Air
conditioner switchIs"OFF".

100 (212)
95 (203)
90 (194)

Q>
-

... LL

:J
0

~~
~o

E

2

c

'"

'0

o

U

Q>

c

'5>
c:

w 20
80

(12) (50)

Vehicle speedkmfh(MPH)

o :
Cooling fansdonot operate.
1222l:
Cooling fansoperate at"Low" speed.
EC-404

TROUBLEDIAGNOSES
Cooling FanControl (Cont'd)

EC-COOL/F-03

•

t t

i

"
S
8

-!- -!-

m
CE51)

COOLING
FAN MOTOR-2

~
I

I

8R G/WLG/R

COOLINGI:!: 1:1]'1:1]11

~~~AY-3 ~~


IbjJJ
lbi=Jl~

LG G/OR 8

I--~

Refer
toEL-POWER.
COOLING
FAN
MOTOR-1

rn

rt~30A

LVffi ~[]]

GY G/W

I I

~g,COOL/F ~BA
=,-I-F
e
,1=

8R GYG/W 8RGYLG/8

COOLING II:!:' I:!r1:1]11 ~OOLINGI:~:I IJjI1:1]11

FAN
nn
FAN
nn

RELAY-1
UU
RELAY-2
UU

(ill)
IbjJJ
lbj.JJ ~
lbi=Jl~

LG/R G/8G/R LGG/Y 8

To {~LG/R:J ~
bl=l-J
I

EC-COOL/F ~.... •....

-01
*
LG
_--I --

----

~ (ill),
(ffi),
(ffi)

~ 8R8R8R
~@,rn

~GY GY

HEC094
EC-407

TROUBLEDIAGNOSES
Cooling FanControl (Cont'd)

Checkcooling fanlow
speed control circuit.
(Go to
I
PROCEDURE C
P

Check cooling fanhigh
speed control circuit.
(Go to
I
PROCEDURE D
I.)

NG
NG

INSPECTION
START

OK

CHECK COOLING FANHIGH SPEED
OPERATION. 1) Turn ignition switch"OFF".
2) Reconnect coolingfanrelay-2 and
cooling fanrelay-3.
3) Turn ignition switch"ON".
4) Make surethatcooling fanoperates
at high speed.
CHECK
COOLING FANLOW SPEED
OPERATION. 1) Turn ignition switch"OFF".
2) Disconnect enginecoolant tempera-
ture sensor connector.

SEF168R
3)Disconnect coolingfanrelays 1,2
and 3.
4) Turn ignition switch"ON".
5) Reconnect coolingfanrelay 1.
6) Make surethatcooling fanoperates
at low speed.

SEC163BA OK

INSPECTION END

EC-408

TROUBLEDIAGNOSES
Cooling FanControl (Cont'd)

•

INSPECTION
START

[!]
CHECK POWER SUPPLY. NG
Check thefollowing.
1) Turn ignition switch"OFF". --.-.
•Harness connector
2) Disconnect coolingfanrelay-1.
~
3) Turn ignition switch"ON". •10A fuse
4) Check voltage between terminals •30A fusible links

G),
@,@and ground. •75A fusible link
Voltage: Batteryvoltage •Harness continuity
OK between
coolingfan
relay-1 andfuse
• Harness continuity
between coolingfan
relay-1 andbattery
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT. NG
Repair harness orcon-
1) Turn ignition switch"OFF". --.-.
nectors.
2) Disconnect coolingfanmotor-1 har-
ness connector andcooling fan
motor-2 harness connector.

I!]
3)Check harness continuity
between terminal (J)and termi-
nal
G),
terminal
@
and termi-
nal
G).

Continuity shouldexist.

II
4)
Check harness continuity
between terminal
@
and body
ground.
Continuity shouldexist.
OK

[j

CHECK OUTPUT SIGNALCIRCUIT. NG
Check thefollowing.
1) Disconnect ECMharness connector. f--..-
•Harness connectors
2) Check harness continuity between
@D,@

ECM terminal
@
and terminal
(?).
•Harness continuity
Continuity shouldexist. betweencoolingfan
OK relay-1
andECM
If NG, repair harness or
connectors.
CHECK COMPONENT NG
Replace coolingfan
(Cooling fanrelay-1). f--..-
relay.
Refer to"COMPONENT INSPECTION".
(See page EC-412.)
~OK
PROCEDURE
C
SEF956P
SEF042Q SEF041Q SEF857P
.~ Cooling
\nY fan
motor-2

~i5

.~ Cooling
\nY fan
motor-1
~
\ttV
Cooling fan
motor-2

~i5

~3
7 5

2 1

~i5

ECM E
CONNECTOR
II

9

~~----

Cooling fanmotor-2
~
\WI
Cooling fan
motor-1

-----~_._----------
--------------------

o

I!l
~i5

A
3
7 5

2 1

SEF958PEC-409

TROUBLEDIAGNOSES
Cooling FanControl (Cont'd)
@

~i5
~
rntJ

Cooling fan
relay. 2,3
SEF168R
SEF959P
CHECK
COMPONENT
(Cooling fanmotors).
Refer to"COMPONENT INSPECTION".
(See page EC-412.)

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.

I
PROCEDURE D

INSPECTION START
CHECK POWER SUPPLY.
1) Turn ignition switch"OFF".
2) Disconnect coolingfanrelay-2 and
cooling fanrelay-3.
3) Turn ignition switch"ON".
4) Check voltage between coolingfan
relay-2, 3terminals
(!J,
@
and
ground.

Voltage: Batteryvoltage
OK

EC-41 0
NG
NG
Replace
coolingfan
motors.
Check thefollowing.
• Harness connectors

(ill!)

• 10A fuse
• 30A fusible links
• 75A fusible link
• Harness continuity
between coolingfan
relay-2, 3and fuse
• Harness continuity
between coolingfan
relay-2, 3and battery
If NG, repair harness or
connectors.

TROUBLEDIAGNOSES
Cooling FanControl (Cont'd)

@

•

1

CHECK GROUND CIRCUIT. NG
Repair harness orcon-
1) Turn ignition switch"OFF".
---...

nectors.
2) Disconnect coolingfanmotor-1 har-
ness connector andcooling fan
motor-2, 3harness connectors.

1:1
3)Check harness continuity
between terminal
@
and termi-
nal
@,
terminal
@
and termi-
nal
@,
terminal
iJ)
and body
ground.

Continuity should
exisl.
OK

0
-

CHECK OUTPUT SIGNALCIRCUIT NG
Check thefollowing.
1) Disconnect ECMharness connector.
---..

•Harness connectors
2) Check harness continuity between
@!D,@

ECM terminal
@
and terminal
@.
•Harness continuity

Continuity should
exisl. betweencoolingfan
OK relay-2,
3and ECM
If NG, repair harness or
connectors.
CHECK COMPONENT NG
Replace coolingfan
(Cooling fanrelay-2, 3).
f----+

relays.
Refer to"COMPONENT INSPECTION"
on next page.
OK
CHECK COMPONENTS NG
Replace coolingfan
(Cooling fanmotors).
f----+

motors.
Refer to"COMPONENT INSPECTION"
on next page.
OK
Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
or the connection ofECM harness con-
nector. Reconnect ECMharness con-
nector andretest.

SEF960P
SEF043Q

AG<

\lliJ

Cooling
fan motor

-2,3

harness
connector

~i5

:~-

[W=ill

Cooling fan
relay-2

~i5

ECM ~CONNECTOR
II

10

II

1:1

o

EC-411

TROUBLEDIAGNOSES
Cooling FanControl (Cant'd)
COMPONENT INSPECTION
Cooling fanrelays-1, -2and -3

Check continuity betweenterminals
@
and
CID,CID
and
(l).

SEC202B
Conditions
12V direct current supplybetween
terminals
G)
and
@

No current supply

If
NG, replace relay. Continuity

Yes
No
Cooling fanmotor-1
harness connector
Cooling fanmotor-2
harness connector
SEF044Q Cooling
fanmotors-1 and-2

1. Disconnect coolingfanmotor harness connectors.
2. Supply cooling fanmotor terminals withbattery voltage and
check operation.
Terminals
Speed
(EB)
(8)

Cooling fan Low

G) @

motor-1 High
@,e!) @,@

Cooling fan Low

e!) @

motor-2 High
@,e!) @,@
Cooling fanmotor should operate.

If NG, replace coolingfanmotor.

EC-412

TROUBLEDIAGNOSES
Air Conditioner CutControl
SYSTEM DESCRIPTION

The airconditioner isturned offunder thefollowing conditions:
RHO models .
• Engine coolant temperature ishigher than
grC
(20rF)
LHD models
• Engine coolant temperature ishigher than105°C (221°F)
For trouble diagnoses, referto"TROUBLE DIAGNOSES" inHA section.
Air
conditioner switch
Engine coolant temperature sensor
A/C

ONsignal
Engine coolant temperature
ECM

(Engine
control module) Air
condi-
tioner relay

•

EC-413