NISSAN ALMERA N15 1995 Service Manual
Page 1101 of 1701
CRANKCASEVENTILATION SYSTEM
SEF157R
l
J
~
Blow-by gas
Q
Freshair
Ventilation Hose
1. Check hosesandhose connections forleaks.
2. Disconnect allhoses andclean withcompressed air.
If
any hose cannot befreed ofobstructions, replace.
SEC692
EC-382
Page 1102 of 1701
relay-2ENGINE
ANDEMISSION CONTROLOVERALLSYSTEM
Component PartsLocation
Engine coolant
temperature sensor
Glowplugs
•
EC-383 SEF159R
Page 1103 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
System Diagram
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SEF160R
Page 1104 of 1701
ENGINEANDEMISSION CONTROLOVERALLSYSTEM
Circuit Diagram
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EC-385
Page 1105 of 1701
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
Page 1106 of 1701
TROUBLEDIAGNOSES
ECM Terminals andReference Values
PREPARATION
1. ECM islocated behindthecenter console panel.Forthis
inspection, removethecenter console undercover.
2. Remove ECMharness protector.
•
MEF603D
!~
Thin wire TesterprobeJ 3.
Perform allvoltage measurements withtheconnectors con-
nected. Extendtesterprobeasshown toperform testseas-
ily.
SEF3671 ECMHARNESS CONNECTOR TERMINALLAYOUT
SEF162R
EC-387
Page 1107 of 1701
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
Page 1108 of 1701
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
•
Page 1109 of 1701
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
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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
Page 1110 of 1701
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
•