1995 NISSAN ALMERA N15 check engine

BASICSERVICE PROCEDURE
Idle Speedllgnition TiminglldleMixtureRatio
Adjustment
PREPARATION
• Make surethatthefollowing partsarein
good order.
(1) Battery
(2) Ignition system
(3) Engine oiland coolant levels
(4) Fuses
(5) ECM harness connector
(6) Vacuum hoses
(7) Airintake system
(Oil filler cap,oillevel gauge, etc.)
(8) Fuel pressure
(9)' Engine compression
(10) Throttle valve
(11) EGR valve operation -For Europe and
Israel andAustralia, andGA15DE M/Tmod-
els
Overall inspection sequence

INSPECTION
(12)
Evaporative emissionsystem
• On models equipped withairconditioner,
checks shouldbecarried outwhile theair
conditioner is"OFF".
• On models equipped withautomatic
transaxle, whenchecking idlespeed, ignition
timing andmixture ratio,checks shouldbe
carried outwhile shiftlever isin
"N"
position.
• When measuring
"CO"
percentage, insert
probe morethan40cm (15.7 in)into tailpipe .•
• Turn offheadlamps, heaterblower, rear
defogger.
• Keep frontwheels pointed straight ahead.
• Make thecheck afterthecooling fanhas
stopped.

Perform diagnostic testmode
1/

(Self-diagnostic results).
Check
&
adjust ignition timing.
Check
&
adjust idlespeed. NG
Repair orreplace.
Check oxygen sensor*1 function.

OK
Check
oxygen sensor*1 har-
ness.
Check CO%.

NG
NG
Repair orreplace harness.
OK Replace oxygensensor*1.
INSPECTION END Check
emission controlparts NGCheck oxygen sensor*1 function. OK
and repair orreplace ifneces-
sary.
*1: Heated oxygen sensor(ForEurope andIsrael, andAustralia AfTmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia AfTmodels)

EC-35

SEF217M
•

START
Visually checkthefollowing:
• Air cleaner clogging
• Hoses andducts forleaks
• Electrical connectors
• Gasket
• Throttle valveandthrottle position sensoroperation

m
Start engine andwarm itup until water temperature
indicator pointstothe middle ofgauge.
Ensure enginestaysbelow 1,000rpm.

iii
Open engine hoodandrunengine atabout 2,000rpm
for about 2minutes underno-load.

[iJ
Perform ECMon-board diagnostic system(Diagnostic
test mode II).
OK lNG
Repair orreplace components asneces-
sary.

I!]
1

Run engine atabout 2,000rpmforabout 2minutes
under no-load.
Race engine twoorthree times under no-load, thenrun
engine forabout 1minute atidle speed.

~

BASIC
SERVICE PROCEDURE
eM]

Idle Speed/Ignition Timing/IdleMixtureRatio
Adjustment (Cont'd)
SEF247F
SEF455Q
MALFUNCTION INDICATORLAMP
SEF248F
EC-37

l

Ii
1)
Turn offengine anddisconnect throttle
position sensorharness connector.
2) Start engine.
Race engine (2,000-3,000 rpm)2or 3times
under no-load andthen runengine atidle
speed.

Ii
Check ignition timingwithatiming light.

Ignition timing:RefertoEC-36.
OK
lNG

Adjust ignition timingtothe specified valueby
turning distributor afterloosening boltswhich
secure distributor.

Ignition timing:RefertoEC-36.

(])

@

l

[!1
1)Turn offengine anddisconnect throttle
position sensorharness connector.
2) Start engine.

~

@
BASIC
SERVICE PROCEDURE
@]

Idle Speed/Ignition Timing/ldleMixtureRatio
Adjustment (Cont'd)
@
SEF695L EC-38

BASICSERVICE PROCEDURE @KJ
Idle Speed/Ignition Timing/IdleMixtureRatio
Adjustment (Cont'd)

1

Check baseidlespeed. RefertoEC-36.

I

OK
NG

Race engine (2,000-3,000 rpm)2or 3times under no-
load andrunengine atidle speed.

III

.
Adjust
idlespeed byturning idlespeed adjusting screw.

Base idlespeed: RefertoEC-36.

1) Turn offengine andconnect throttleposition sensorharness connec-
tor.
2) Start engine.

1

Start engine.
Race engine (2,000-3,000 rpm)2or 3times under no-
load andrunengine atidle speed.

t

EC-39
•

o
1:<
MONITOR
1<
NO FAIL
0
BASIC
SERVICE PROCEDURE
@KJ

Idle Speedllgnition Timing/IdleMixtureRatio
Adjustment (Cont'd)

@

CMPS.RPM (REF)
MIR
F/C
MNT 2000rpm
RICH
Checkidlespeed. Refer10EC-36.
OK NG

Check IACV-AAC valveandreplace ifnecessary.

__ R_E_C_O_R_D __
I

SEF515Q

CheckIACV-AAC valveharness andrepair ifneces-
sary.
Check ECMfunction- bysubstituting anotherknown
good ECM.
-ECM maybethe
cause ofaproblem,
but this israrely the
case.

SEF987K

(g~~~:: _
mJ
~~r

l~~~~V
-~

Data linkconnector forCONSULT
(Connect CHKandIGN terminals
with asuitable harness.)

SEF909P

MALFUNCTION INDICATORLAMP

SEF217M
o

(ij\E
1.See "MIA
F/C
MNT" in"Data monitor"
~ mode.
2. Run engine atabout 2,000rpmforabout 2
minutes underno-load.
3. Maintaining engineat2,000 rpmunder
no-load (engine iswarmed upsufficiently.),
check thatthemonitor fluctuates between
"LEAN" and"RICH" morethan5times dur-
ing 10seconds.

1 lime: RICH->LEAN ->RICH
2 limes: RICH->LEAN
->
RICH ->LEAN
->

RICH OR

Set "Oxygen sensormonitor" indiagnostic
test mode II.
(See page EC-47.)
2. Run engine atabout 2,000rpmforabout 2
minutes underno-load.
3. Maintaining engineat2,000 rpmunder
no-load, checkthatthemalfunction indicator
lamp onthe instrument panelgoesONand
OFF more than5times during 10seconds.

OK

END

EC-40 NG

•

oxygen
sen-
Europe and
nd Australia

els)

sensor
for Europe
el, and Aus-
T models)

@

II

Check oxygen sensor*1 harness: *1:
Heated
1) Turn offengine anddisconnect battery sor
(For
ground cable. Israel,
a
2) Disconnect ECMharness connector from
AIT

mod
ECM. Oxygen
3) Disconnect oxygensensor*1 harnessconnec- (Except
tor. Then connect harness sideterminal for and
Isra
oxygen sensor*1 toground withajumper tralia

AI

wire.
4) .Check forcontinuity betweenterminalNo.46
or No. 19ofECM harness connector and
body ground.
Continuity exists................................................ OK
Continuity doesnotexist .................................. NG
OK lNG

I
Repair orreplace harness.
Connect ECMharness connector tocontrol unit.

~
III

00
1)
Connect batteryground cable.
2) Select "ENGCOOLANT TEMP"in
"ACTIVE TEST"mode.
3) Set "COOLANT TEMP"to20°C (68°F)
by touching "au"and"ad" and
"UP", "DWN".
OR

@
1)
Disconnect enginecoolant tempera-
ture sensor harness connector.
2) Connect aresistor (2.5kQ)between
terminals ofengine coolant tempera-
ture sensor harness connector.

[+]
Start engine andwarm itup until water temper-
ature indicator pointstomiddle ofgauge.

~

BASIC
SERVICE PROCEDURE ~
Idle Speed/Ignition Timing/IdleMixtureRatio
Adjustment (Cont'd)

CD

SEF194R
SEF056PA
~

DISCONNECT

18
~
AEC681

===MONITOR===
CMPS.RPM (REF)
Orpm

INJ PULSE
O.7msec

IGN TIMING 5BTDC

SEC242BA

•
ACTIVE TEST.
0

COOLANT TEMP 20°C

Engine coolant

DISCONNECT
temperature

10
!;j:~:~~'~";"'"

~

00
2.5k
n
resistor

II

ECM
19'
CONNECTOR
II

19

II

For Australia

II
ECM ~CONNECTORII

46

II
Except forAustralia

SEF455Q EC-41

@@

'1: Heated oxygen sensor(ForEurope
and Israel, andAustralia AITmod-
els) Oxygen sensor(Except forEurope
and Israel, andAustralia AITmod-
els)

Ii

1

Race engine twoorthree times under no-load, thenrunengine atidle
speed.

1

Check "CO"%.

Idle CO:Less than10%

[!J

After checking COOJo,

00
1)
Touch "BACK".

@
1)
Disconnect theresistor fromterminals ofengine coolant tem-
perature sensorh.arness connector.
2) Connect enginecoolant temperature sensorharness connector
to engine coolant temperature sensor.
NG OK
Replace oxygensensor'1.

m

00
1.
See
"M/R
FIC
MNT" in"Data monitor" mode.
2. Maintaining engineat2,000 rpmunder no-load
(engine iswarmed upsufficiently.), checkthat
the monitor fluctuates between"LEAN"and
"RICH" morethan5times during 10seconds.

1 time :RICH
->
LEAN
->
RICH
2 times: RICH
->
LEAN
-+
RICH
->
LEAN
->

RICH
OR

Ii)

@
1.
Set "Oxygen sensormonitor" indiagnostic test
.mode II.
(See page EC-47.)
2. Maintaining
engineat2,000 rpmunder no-load,
check thatthemalfunction indicatorlamponthe
instrument panelgoesONand OFF more than5
times during 10seconds.

I
NG OK

SEF913J

2000rpm
RICH

1;:(

NO FAIL
0
SEF248F

CMPS.RPM (REF)
MIR
FIC
MNT

1;:(

MONITOR
BASIC
SERVICE PROCEDURE ~
Idle Speed/Ignition TiminglldleMixtureRatio
Adjustment (Cont'd)

~\\~\\\\""1"'1///1.
@

#'
7 5~

~ ~
{2{ 6~

?1 7-=1

:;::. .;f

~o 84

xl000 rlmin

SEF987K

(gJ~
~~~~N

l~~i~V-=~
-~

Data linkconnector forCONSULT
(Connect CHKandIGNterminals
with asuitable harness.)

__
R_E_C_O_R_D __
I

SEF515Q
SEF909P EC-42

BASICSERVICE PROCEDURE []KJ
Idle Speed/Ignition Timing/IdleMixtureRatio
Adjustment (Cont'd)

@

Connect oxygensensorharness connector tooxygen
sensor.
Check fuelpressure regulator.
(See page EC-33.)

.

Check massairflow sensor anditscircuit.
(See page EC-107.)
Check injector anditscircuit.
(See page EC-141.)
Clean orreplace ifnecessary.
Check engine coolant temperature sensoranditscir-
cuit. (See page EC-112.)
Check ECMfunction* bysubstituting anotherknown
good ECM.
*.ECM maybethe caus
but this israrely thece
of aproblem,
ase.
•

EC-43