1995 NISSAN ALMERA N15 ECO mode

BASICSERVICE PROCEDURE

• FUEL PRESRELEASE. D
FUEL PUMP WILLSTOP BY
TOUCHING STARTDURING
IDLE.
CRANK AFEW TIMES AFTER
ENGINE STALL

---S-T~-RT--
SEF823K
Fuel
Pressure Release

Before disconnecting fuelline, release fuelpressure fromfuel
line toeliminate danger.

(ij\
1.Turn ignition switch"ON".
~ 2.Perform "FUELPRESSURE RELEASE"in"WORK
SUPPORT" modewithCONSULT.
3. Start engine.
4. After engine stalls,crankittwo orthree times to
release allfuel pressure.
5. Turn ignition switch"OFF".

SEF921P
00
~:

3.
4.
Remove
fuseforfuel pump. •
Start engine.
After engine stalls,crankittwo orthree times to
release allfuel pressure.
Turn ignition switchoffand reconnect fuelpump
fuse.

Vacuum Fuelpressure

..... L
To pressure regulator
Fuel
Pressure Check

• When reconnecting fuelline, always usenew clamps.
• Make surethatclamp screwdoesnotcontact adjacent
parts.
• Use atorque drivertotighten clamps.
• Use Pressure Gaugetocheck fuelpressure.
• Donot perform fuelpressure checkwithsystem operating.
Fuel pressure gaugemayindicate falsereadings.

1. Release fuelpressure tozero.
2. Disconnect fuelhose between fuelfilter andfuel tube
(engine side).
3. Install pressure gaugebetween fuelfilter andfuel tube.
4. Start engine andcheck forfuel leakage.
5. Read theindication offuel pressure gauge.

At idling:
With vacuum hoseconnected
Approximately 245kPa (2.45 bar,2.5kg/cm
2,
36psi)
With vacuum hosedisconnected
Approximately 294kPa (2.94 bar,3.0kg/cm
2,
43psi)

If results areunsatisfactory, performFuelPressure Regula-
tor Check.

Fuel Pressure Regulator Check

1. Stop engine anddisconnect fuelpressure regulator vacuum
hose fromintake manifold.
2. Plug intake manifold witharubber cap.
3. Connect variablevacuumsourcetofuel pressure regulator.
4. Start engine andread indication offuel pressure gaugeas
vacuum ischanged.

Fuel pressure shoulddecrease asvacuum increases. Ifresults
are unsatisfactory, replacefuelpressure regulator.

SEF7188
EC-33

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

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

Turnignition switch"ON".
(Do notstart engine.)

ON-BOARD
DIAGNOSTIC SYSTEMDESCRIPTION

Malfunction Indicatorlamp(Mil)(Cont'd)

HOW TOSWITCH DIAGNOSTIC TESTMODES

Diagnostic TestMode I- BULB CHECK
DiagnosticTestMode I
- MALFUNCTION WARNING
(Turn diagnostic testmode
selector onECM fullyclockwise.)
o,~yr;;~N

~-~

Data linkconnector forCONSULT
(Connect CHKandIGNterminals
with asuitable harness.)
•

Wait atleast 2seconds.
(Turn diagnostic testmode
selector fullycounterclockwise.)
O,~/~N

~-~

Data linkconnector forCONSULT
(Disconnect CHKandIGNterminals
with asuitable harness.)

DIAGNOSTIC TESTMODE II ~
Q~

- SELF-DIAGNOSTIC RESULTS ON~
S art engine. Diagnostic
TestMode II
- OXYGEN SENSOR MONITOR*1
Wait atleast 2seconds.

1
*1:
Heated oxygen sensor(ForEurope andIsrael,
and Australia AfTmodels)
Oxygen sensor(Except forEurope andtsrael,
and Australia AfTmodels)

•
Switching themodes isnot possi-
ble when theengine isrunning.
• When ignition switchisturned off
during diagnosis, powertoECM
will drop afterapprox. 5second.
The diagnosis willautomatically
return toDiagnostic TestMode I.
• Turn backdiagnostic testmode
selector tothe fully counterclock-
wise position whenever vehicleis
in use.

~~Ol
W:jr

g2g~E;V

~~~;::
or

-~

Data linkconnector forCONSULT
(Disconnect CHKandIGNterminals
with asuitable harness.)

[gJ~~~~~~

~~r

0'
~!~~:V

-~

Data linkconnector forCONSULT
(Connect CHKandIGNterminals
with asuitable harness.)

EC-45

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION @KJ

Malfunction Indicatorlamp(Mil)(Cont'd)

DIAGNOSTIC TESTMODE I-BULB CHECK

In this mode, theMALFUNCTION INDICATORLAMPonthe instrument panelshould stayON.Ifitremains
OFF, check thebulb. Refer toEL section ("WARNING LAMPSANDCHIME") orsee EC-223.

DIAGNOSTIC TESTMODE I-MALFUNCTION WARNING
MALFUNCTION INDICATORLAMP
ON
OFF Condition
Engine coolant temperature sensorcircuitmalfunction oroverheating isdetected, or
the ECM's CPUismalfunctioning.
No malfunction.

• These Diagnostic TroubleCodeNumbers areclarified inDiagnostic TestMode II(SELF-DIAGNOS-
TIC RESULTS).

DIAGNOSTIC TESTMODE II-SELF-DIAGNOSTIC RESULTS

In this mode, adiagnostic troublecodeisindicated bythe number ofblinks ofthe MALFUNCTION INDI-
CATOR LAMPasshown below.

Example: Diagnostic troublecodeNo.12and No.43

ON
0.6
03

111-'1
0.6

II
0.3
OFF
j
~

~~ -I.
--.1
-4--1--

Q9 O~ 21 OB Q9

'--------v----' '--------v------~

Diagnostic troublecodeNo.12 DiagnostictroublecodeNo.43
2.1
Unit:second
AEC490
• SELF-DIAG RESULTS.
0

FAILURE DETECTED TIME
NATS MALFUNCTION
0

I
ERASE

II
PRINT

I

SEF288Q

Long
(0.6second) blinkingindicates thenumber often digits, andshort (0.3second) blinkingindicates
the number ofsingle digits. Forexample, themalfunction indicatorlampblinks 4times forabout 2.5
seconds (0.6secx4 times) andthen itblinks threetimes forabout 1second (0.3secx3 times). This
indicates theDTC "43" andrefers tothe malfunction ofthe throttle position sensor.
In this way, allthe detected malfunctions areclassified bytheir diagnostic troublecodenumbers. The
DTC "55" refers tono malfunction. (SeeDIAGNOSTIC TROUBLECODECHART, refertoEC-62.)

HOW TOERASE DIAGNOSTIC TESTMODE II(Self-diagnostic results)

The diagnostic troublecodecanbeerased fromthebackup memory inthe ECM when thediagnostic
test mode ischanged fromDiagnostic TestMode IIto Diagnostic TestMode
I.
(Refer to"HOW TO
SWITCH DIAGNOSTIC TESTMODES" onprevious page.)

• Ifthe battery terminal isdisconnected, thediagnostic troublecodewillbelost from thebackup
memory within24hours.
• Becareful nottoerase thestored memory before
startin~
troublediagnoses.

• If
the MIL blinks or"NATS MALFUNCTION" isdisplayed on
"SELF-OIAG RESULTS"screen,perform self-diagnostic
results modewithCONSULT usingNATS program card
(NATS-E940). RefertoEL section.
• Confirm noself-diagnostic resultsofNATS isdisplayed
before touching "ERASE" in"SELF-DIAG RESULTS"mode
with CONSULT.
• When replacing ECM,initialisation ofNATS V2.0system and
registration ofall NATS V2.0ignition key10smust becar-
ried outwith CONSULT usingNATS program card(NATS-
E940).
Therefore, besure toreceive allkeys from vehicle owner.
Regarding theprocedures ofNATS initialisation andNATS
ignition key10registration, refertoCONSULT operation
manual, NATS V2.0.
EC-46

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
[QKJ

Malfunction Indicatorlamp(Mil)(Cont'd)

DIAGNOSTIC TESTMODE II-OXYGEN SENSOR*1MONITOR

In this mode, theMALFUNCTION INDICATORLAMPdisplays thecondition ofthe fuel mixture (leanor
rich) which ismonitored bythe oxygen sensor*1.

MALFUNCTION INDICATORLAMPFuelmixture condition inthe exhaust gas
Airfuel ratio feedback controlcondition
ON Lean
OFF RichClosed
loopsystem
*2 Remains ONorOFF Anycondition
Openloopsystem
*2: Maintains conditions justbefore switching toopen loop.

To check theoxygen sensor*1 function,startengine inDiagnostic TestMode II.Then warm itup until
engine coolant temperature indicatorpointstomiddle ofgauge. •
Next runengine atabout 2,000rpmforabout 2minutes underno-load conditions. Makesurethatthe
MALFUNCTION INDICATORLAMPcomes ONmore than5times within 10seconds withengine running
at 2,000 rpmunder no-load. .

*1: Heated oxygen sensor(ForEurope andIsrael, andAustralia
AfT
models)
Oxygen sensor(Except forEurope andIsrael, andAustralia
AfT
models)

EC-47