1995 NISSAN ALMERA N15 engine coolant

ENGINEANDEMISSION CONTROL OVERALLSYSTEM
System Chart

Ignition key
Engine coolant temperature
sensor Quick-glow
system
Partial loadadvance (PLA)
control Glow
relay
&
glow lamp
Solenoid timer
Engine speedsensor
Air conditioner switch
Battery voltage
Vehicle speedsensor
ECM

(Engine
control module) Coolingfancontrol
Air conditioner cutcontrol

EC-386
Cooling
fanrelay
Air conditioner relays

ECMINSPECTION TABLE TROUBLE
DIAGNOSES ~
ECM Terminals andReference Values(Coni'd)

-Data arereference values.
TER-
MINAL ITEM CONDITION -DATA
NO.
IEngineisrunning.1
L Both
AIC
switch andblower fanswitch areApproximately
OV
8 Air
conditioner relay "ON".
IEngine isrunning.1
BATTERYVOLTAGE
LAIC switchis"OFF". (11
-14V)
IEngine isrunning.1
BATTERY VOLTAGE
Cooling fanrelay (Low L
Cooling fanisnot operating. (11-14V)

9
speed) IEngineisrunning
I

L
Cooling fanisoperating. 1V
IEngine isrunning.1
BATTERYVOLTAGE
Cooling fanrelay (High
t

Cooling fanisnot operating.
(11-14V)
10 Cooling
fanisoperating atlow speed.
speed) IEngineisrunning.1

L
Cooling fanisoperating athigh speed. 1V
0- 5.0V
15 Engine
coolant temperature
IEngineisrunning.1 Output
voltage varieswith
sensor enginecoolant temperature.
25 jlgnitionswitch"ON"I BATTERY
VOLTAGE
37 Power
supply forECM
(11-14V)
jlgnition switch"ON"I
ApproximatelyOV
28 Startsignal
llgnitionswitch"START"I SA
TTERY VOLTAGE
(11 -14V)
Ilgnition keyisnot inserted.1
OV
BATTERY VOLTAGE (11-
30 Key-in
switch
14V)[for3seconds at
Ilgnition keyisinserted.1
enginecoolant temperature

-
ofapprox. 60°C(140°F) or
less)
IEngine isrunning.1

L
Both airconditioner switchandblower fanApproximately
OV
31 Airconditioner switch switch
are"ON".
IEngine isrunning.1
BATTERYVOLTAGE

L
Airconditioner switchis"OFF". (11
-14V)
38 Power
supply Ilgnition
switch"OFF"I BATTERY
VOLTAGE
(11 -14V)
106 Glowrelay
Referto"Quick-glow System".

EC-388

TROUBLEDIAGNOSES ~
ECM Terminals andReference Values(Cont'd)
*Data arereference values.
TER-
MINAL ITEM CONDITION
*DATA
NO.
IEngineisrunning.1
BATTERYVOLTAGE

L
Engine coolant temperature islower than
(11-14V)

we
(50'F).
108 Solenoid timer
/Engineisrunning.1

L
Engine coolant temperature ishigher than Approximately
OV

we
(50'F).
EC-389
•

TROUBLEDIAGNOSES
Quick-glow System
SYSTEM DESCRIPTION

Ignition key
Engine coolant temperature sensorKey-in
switch andkeyposition
Engine coolant temperature
ECM

(Engine
control
module) Glow
relay
Glow lamp Glow
plugs
Ignition START[~

~

switch

~~[ I
11
I

1iI

Key

~

switch OUT
-II-
T,

I
!

I
I-l

Key ONe
n

Hn
JTl-

.1"l....!:.1L-

~

timer
OFF
Ir1
To
I

UL
HTo
HT'o
Lamp ON
[
..Lfl

o~~
I
I-.J
TL
I

~
I

I-l
TL

I
I
I
I
I

HTL
I-l

T'L
Relay OFF
[j
I_
L-
r--L

.f"l.-.JL

~

T.

"'
II

I

II
~
1r;,1

I II I
I,

Glow plug
temperature
Normaloperation
Operationafter
key timer isOFF Leaving
keyin
ON position Repeating
keyIN
and OUT Repeating
keyON
and OFF
TL
=
T,-T,
when T,-0.5 >T,

TL
= T,

when T,-0.5 ~T,
;a;
To
TL

=.
T,

when To
<
T, T'o
~80% ofTo
when T.
5':
3sec.
T',

=.
T,

T',
=.
T,

SEC550B

When theignition keyisinserted intothekey
cylinder, theengine control module turnsonthe
relay andthe"high-level" electriccurrentflows
through theglow plugs andheats themup
quickly. Whentheignition switchisturned on,the
control module turnsonthe indicator. AfterT
1

seconds havepassed fromkeyin,the control
module turnsoffthe indicator. While
cranking, therelay remains on.The relay
automatically turnsoffafter T
4
seconds have
passed fromtheengine start.

Engine coolant temperature sensor
Second Enginecoolant tempera-' Remarks
ture 'C('F) Resistance
(kQ)
To
3.1
-3.9

- -

5.0 -7.0 -25(-13)
19.7

T,
1.8
-3.2
20(68)
2.5
0.8 -2.2 60(140)
0.6
17.0 -23.0
Lowerthan
60(140)

Morethan
0.6

T
3

40-6.0

Higherthan
60(140)

Lessthan
0.6
255 -345
Lowerthan
60(140)

Morethan
0.6

Whenalternator is

T
4

working
Less than
10

Higherthan
60(140)

Lessthan
0.6
15 -25

Lowerthan
60(140)

Morethan
0.6

Whenalternator isnot

(T
4)

working

3 -7

Higherthan
60(140)

Lessthan
0.6

T
5
0.1-0.9

- -

EC-390

TROUBLEDIAGNOSES
Quick-glow System(Cont'd)
DESCRIPTION
Engine coolant temperature sensor(ECTS)

The engine coolant temperature sensordetects enginecoolant
temperature andtransmits asignal tothe ECM.
Electrical resistance ofthe thermistor decreases inresponse to
the temperature rise.

Key-in switch

The key-in switch isbuilt intothekey cylinder. TheECM detects
the key position andcontrols thekey-in glowsystem.

SEF938P
EC-391
•

TROUBLEDIAGNOSES
Quick-glow System(Cont'd)

EC-GLOW-01

IGNITION SWITCH IGNITIONSWITCH
START ONorSTART

7.5A
1261
10A

1251
10A

IT]
FUSE
BLOCK
(JIB)
@:ID
Refer
toEL-POWER.

:
LHDmodels

<£D:
RHOmodels

ECM
(ENGINECONTROL
MODULE)

@

TW

~
G/B

I
Toengine coolant
-------.. temperaturesensor
(Refer toEC-COOL/F.)

1I~11

Y

I

Y

I!i
COMBINATION

METER
(GLOW LAMP)

11
3•3
1
@

OR

I

OR

m
GIL

1Ni91

BR
BR

~
IGN

1Ni91

BR

BR

~
IGN

IN.41

B/Y

GNO-C GNO-C GNO-AGNO-A

12.6
I 11
3•9
I
11~11 11~51

B BB B

I
II I

----.-_-.- __1.

I

.-o-ee-°l
I
<;
A
;>

B
1---.1
B

-!-! .-!-

B/Y

~

START

Refertolast page
(Foldout page).

HEC088
EC-392