air condition NISSAN ALMERA N15 1995 Service Manual

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
mJ

Power Steering OilPressure Switch
(Cont'd)

~i5
dIb

~i5

II
ECM
~CONNECTORII

43 AEC760
SEF501Q
@

1

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

nectors.
2. Disconnect powersteering oilpres-
sure switch harness connector.
3. Check harness continuity between
terminal
@
and engine ground.
Continuity shouldexist.
If OK, check harness forshort.
OK

[!J
CHECK INPUTSIGNAL CIRCUIT. NG
Check thefollowing.
1. Disconnect ECMharness connector.
--..

•Harness connectors
2. Check harness continuity between
CID,@

ECM terminal
@
and terminal
CD.
•
Harness connectors
Continuity shouldexist.
@,@D

If OK, check harness forshort. •
Harness foropen or
OK short
between ECMand
power steering oilpres-
sure switch
If NG, repair harness or
connectors.

Power steering oilpressure switch

1. Disconnect powersteering oilpressure switchharness con-
nector thenstart engine.
2. Check continuity betweenterminals
CD
and
@.

~
to
ID

~
CHECK
COMPONENT
(Power steering oilpressure switch).
Refer to"COMPONENT INSPECTION"
below.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

COMPONENT INSPECTION

Conditions
Steering wheelisbeing turned
Steering wheelisnot being turned NG
Replace powersteering
oil pressure switch.
Continuity
Yes
No
AEC762
IfNG, replace powersteering oilpressure switch.

EC-356

INSPECTIONEND
INSPECTION
START
CHECK OVERALL FUNCTION. OK

fiii\
1.Turn ignition switch"ON".
~ 2.Perform "PARK/NEUT POSI
SW CKT" in"FUNCTION
TEST" modewithCONSULT.
OR

rif1
1.Turn ignition switch"ON".
~ 2.Select "PINPOSI SW"in
"DATA MONITOR" modewith
CONSULT.
3. Check "PINPOSI SW"signal
under thefollowing conditions.

"N"
or
"P"
position: ON
Except aboveposition: OFF
OR
1. Make surethatinhibitor switch
circuit functions properly.
(Refer toAT section.)
2. Turn ignition switch"ON".
3. Check voltage between ECM
terminal @and ground under
the following conditions.
Voltage: UN" or
uP"
position
Approximately OV
Except aboveposition
Battery voltage
SEF963N
MEC7798
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Park/Neutral PositionSwitch(Cont'd)

I
Inhibitor
switch(AIrmodels)
J

m

•PARKINEUT POSISWCKT •
SHIFT
OUT OFNIP-POSITION
THEN
TOUCH START

I
NEXT
II
START

I

MEC7318

m
*MONITOR *NO FAIL
0

PIN POSI SW ON
RECORD

m~i)~0
II
ECM
~CONNECTORII

30

NG
EC-360

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S)(Cont'd)
SYSTEM DESCRIPTION
Heated oxygen sensorheatercontrol

ECMHeated

I
Crankshaft positionsensor
I

Engine speed (ECCS

~
oxygen

~
control sensor
module) heater

OPERATION •

--~-

The
ECM performs ON/OFFcontrolofthe heated
oxygen sensorheatercorresponding tothe
engine speed.

Enginespeedrpm

Above 3,200
Below 3,200
Heated
oxygen sensor
heater

OFF
ON

i
Heaterpad
Isolation
bearing Zirconia

i

tube
SEF406H COMPONENT
DESCRIPTION
The heated oxygen sensorisplaced intothefront tube. It
detects theamount ofoxygen inthe exhaust gascompared to
the outside air.The heated oxygen sensorhasaclosed-end
tube made ofceramic zirconia. Thezirconia generates voltage
from approximately 1Vinricher conditions to
av
inleaner con-
ditions. Theheated oxygen sensorsignalissent tothe ECM.
The ECM adjusts theinjection pulseduration toachieve the
ideal air-fuel ratio.Theideal air-fuel ratiooccurs neartherad-
ical change from1Vto
av.

2
1

::>

OJ
~

(5

>

"5
c.

"5

0

:'--

0

-

Rich ---
Ideal

ratio _
Lean
Mixture ratio

SEF288D
EC-363

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Heated Oxygen Sensor(H02S) (Cont'd)

•

Repair harness orcon-
nectors. Go
to"CHECK
COMPONENT".
Check thefollowing.
• Harness connectors

aD,@

• 10A
fuse
• Harness foropen or
short between heated
oxygen sensorand
fuse
If NG, repair harness or
connectors.

OK
NG
NG
OK
CHECK
HEATED OXYGEN SENSOR
HEATER CIRCUIT.

1. Reconnect harnessconnectors.
2. Start engine.
3. Check voltage between ECMterminal

Gill
andground withCONSULT or
tester underthefollowing conditions.

Voltage: Engine speedisbelow 3,200rpm
Approximately OV
Engine speedisabove 3,200rpm
Battery voltage
CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect heatedoxygen sensor
harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground.

Voltage: Batteryvoltage@
CHECK OUTPUT SIGNALCIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector.
3. Check harness continuity between
terminal
G)
and ECM terminal
Gill.
Continuity shouldexist.
If
OK, check harness forshort.

SEF646P
MEC784B

~i5

cillID
MEC783B

~i5

ECM
J9"
CONNECTOR
II

111

@J

~i)~ID

II
ECM
J9"
CONNECTOR
II

111

OK

Loosen andretighten engineground
screws.
CHECK COMPONENT
(Heated oxygensensorheater).
Refer to"COMPONENT INSPECTION"
on next page.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
NG

Replace heatedoxygen
sensor.
Trouble isnot fixed
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

EC-365

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS~
Torque Converter ClutchSolenoid Valve(Cont'd)
SYSTEM DESCRIPTION

Throttle position sensor Throttle
valveopening angle
Engine coolant temperature sensorEnginecoolant temperature ECM
(ECCS
control
module) Torque
converter
clutch solenoid
valve
Vehicle speedsensor Vehicle
speed

The
AfT
lock-up iscontrolled bythe ECM through
the torque converter clutchsolenoid valve.When
the ECM detects anyofthe following conditions,
the ECM switches thetorque converter clutch
solenoid valveOFFtoaccomplish lock-upopera-
tion. While thevehicle isinconditions otherthan
below, thetorque converter clutchsolenoid valve
is always settoON, relea'sing thelock-up oper-
ation. •
Throttle position isopen .
• Engine coolant temperature is70°C (158°F) or
more .
• Vehicle speedis58 kmfh (36MPH) ormore.

~i3~

II
ECM
E[CONNECTORII
DIAGNOSTIC
PROCEDURE

INSPECTION START
115

OK

INSPECTION END
CHECK
COMPONENT
(Torque converter clutch
solenoid valve).
Refer to"Electrical Com-
ponents Inspection" in
AT section.

If
NG, replace torque
converter clutchsolenoid
valve.
Check thefollowing.
• Harness connectors

@,
• 10A fuse
• Harness foropen or
short between torque
converter clutchsole-
noid valve andfuse
If NG, repair harness or
connectors.

NG
OK
OK
@
CHECK
CONTROL FUNCTION.

1. Jack updrive wheels.
2. Start engine andwarm itup suffi-
ciently.
3. Shift selector leverto"0" position.
4. Check voltage between ECMterminal

GID
andground underthefollowing
conditions.
Voltage: Accelerator pedalIsdepressed
[Vehicle speedisabove
58 km/h (36MPH).]
Battery voltage
Accelerator pedalisfully
released
Approximately OV

CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect torqueconverter clutch
solenoid valveharness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground.
Voltage: Batteryvoltage

-

MEC785B
MEC279BA

Ef

CONNECTOR
II

115

II

ECM
~~
ID
cf8~-H
EC-368

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
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
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

TROUBLEDIAGNOSES
Air Conditioner CutControl (Cont'd)
LHD models

EC-A/CCUT-01

Refer toEL-POWEA.

OFF

LG/R~
I

,
I

I
ON
A/C
LG/R
I

SWITCH

m
I

OFF

@

I

THERMO
CONTROL
AMP.

~
ON

L/Y

~ ~
G/B G/BG/Y

THERMISTOR
I I
m

._-~--_. rn
JUNCTION

BOX
NO.2

To compressor (JOINT
._ L/R. (Referto CONNECTORS)

I
HA-A/C.)~~

G/Y

00
~E~N~~gD
I?iJ
~~~TCH

VALVE OFF--~

IkjJ
(E64) ~

B (E65) B

I
r1
I

• .., BBB

1 ~
1
i....l

mm ~~

RIL
~

t

FUSE
BLOCK
(JIB)
~

(BOO)

R/L

IriDl
A/C

DUAL-
PRESSURE SWITCH

~

1~11I~211~1

LIB LG/R LG/R

II-~ --

LIB
L/Y

IT ~IA/C
n

RELAY

U
UID

4=JJ~
L L/R

~L

rn

I
ECM(ENGINECONTROLMODULE)

---------- @

n

LOW HIGH

... ~~_.

NORMAL

I!4Jl
G

~~1;1$1
G

m

COMP

~(E16)

T
L

JS4.ffi

(tiS)
B
~-----------.,

I I

:ITl~ ~~:

I I

L
~
IQl@

~ W
Refer
tolast page
(Foldout page).

CMID
(El0n

,

lf1@
(E106)

,

~
HEC095
EC-414