1995 NISSAN ALMERA N15 spark plugs

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
CONSULT (Cont'd)
ACTIVE TESTMODE

TEST ITEM CONDITION JUDGEMENT
CHECKITEM(REMEDY)
• Engine: Returntothe original
•Harness andconnector
FUEL INJECTION trouble
condition If
trouble symptom disappears,
•Fuel injectors
• Change theamount offuel see
CHECK ITEM.
injection usingCONSULT . •
Oxygen sensor*1
• Engine: Afterwarming up,idle
IACV-AACIV the
engine.
Enginespeedchanges according •Harness andconnector
OPENING •
Change theIACV-AAC valve
tothe opening percent. •
IACV-AAC valve
opening percentusingCON-
SULT.
• Engine: Returntothe original
•Harness andconnector
ENG COOLANT trouble
condition
Iftrouble symptom disappears, •
Engine coolant temperature
TEMP •
Change theengine coolant

.
see CHECK ITEM. sensor
temperature indicationusing
•Fuel injectors
CONSULT.
• Engine: Returntothe original
trouble condition
Iftrouble symptom disappears,
IGNITION TIMING•
Timing light:Set •
Adjust initialignition timing
• Retard theignition timingusingsee
CHECK ITEM.
CONSULT .
• Engine: Afterwarming up,idle •
Harness andconnector
the engine. •
Compression
POWER •
A/C switch "OFF"
Enginerunsrough ordies . •
Injectors
BALANCE •
Shift lever "N" •
Power transistor
• Cut offeach injector signalone •
Spark plugs
at atime using CONSULT. •
Ignition coils
• Ignition switch:ON
COOLING FAN*3•
Turn thecooling fan"ON" and
Cooling fanmoves andstops. •
Harness andconnector
"OFF", or"LOW" and"HI" •
Cooling fanmotor
and "OFF" usingCONSULT .
• Ignition switch:ON(Engine
FUEL PUMP stopped)
Fuelpump relaymakes theoper- •Harness andconnector
• Turn thefuel pump relay"ON"
RELAY and"OFF" usingCONSULT ating
sound. •
Fuel pump relay
and listen tooperating sound.
EGRC SOLENOID
VALVE (EVAP canister
•Ignition switch:ON
purge control
•Turn solenoid valve"ON" and Solenoid
valvemakes anoperat- •
Harness andconnector
solenoid valveor
EGR valve
&
"OFF"
withtheCONSULT andingsound. •
Solenoid valve
EVAP canister listen
tooperating sound.
purge control
solenoid valve)
•Ignition switch:ON
VALVE TIMING •
Turn solenoid valve"ON" and Solenoid
valvemakes anoperat- •
Harness andconnector
SOL*2 "OFF"
usingCONSULT anding
sound. •
Solenoid valve
listen tooperating sound.
SELF-LEARNING •
Inthis test, thecoefficient ofself-learning controlmixture ratioreturns tothe original coefficient by
CONT touching
"CLEAR" onthe screen.
*1: Heated oxygen sensor(ForEurope andIsrael, andAustralia A/Tmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia A/Tmodels)
*2: GA16DE except forEurope andIsrael
*3: GA16DE engine A/Tmodels forEurope without heavydutykithave a2- step control [ON/OFF] system."LOW"and"HI"
are shown onCONSULT screentorepresent "ON"condition.

EC-53
•

TROUBLEDIAGNOSIS -General Description
Sensors
~ ECMActuators
~~.~ MEF036D
SEF234G Introduction

The engine hasanECM tocontrol majorsystems suchasfuel
control, ignitioncontrol, idleaircontrol system, etc.The ECM
accepts inputsignals fromsensors andinstantly drivesactua-
tors. Itis essential thatboth input andoutput signals areproper
and stable. Atthe same time,itis important thatthere areno
problems suchasvacuum leaks,fouled sparkplugs, orother
problems withtheengine.
It is much moredifficult todiagnose aproblem thatoccurs
intermittently ratherthancontinuously. Mostintermittent prob-
lems arecaused bypoor electric connections orimproper wir-
ing. Inthis case, careful checking ofsuspected circuitsmay
help prevent thereplacement ofgood parts.
A visual checkonlymaynotfind thecause ofthe problems. A
road testwith CONSULT oracircuit testerconnected shouldbe
performed. Followthe"Work Flow"onthe next page.
Before undertaking actualchecks, takejustafew minutes to
talk with acustomer whoapproaches withadriveability com-
plaint. Thecustomer cansupply goodinformation aboutsuch
problems, especially intermittent ones.Findoutwhat symptoms
are present andunder whatconditions theyoccur. A"Diagnos-
tic Worksheet" liketheexample onEC-61 should beused.
Start yourdiagnosis bylooking for"conventional" problems
first. Thiswillhelp troubleshoot driveabilityproblemsonan
electronically controlledenginevehicle.

EC-58

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
CONSULT (Conl'd)
ACTIVE TESTMODE

TEST ITEM CONDITION JUDGEMENTCHECKITEM(REMEDY)
• Engine: Returntothe original
•Harness andconnector
FUEL INJECTION trouble
condition
Iftrouble symptom disappears,
•Fuel injectors
• Change theamount offuel
seeCHECK ITEM.
•Heated oxygen sensor
injection usingCONSULT .
• Engine: Afterwarming up,idle
IACV-AACIV the
engine.
Enginespeedchanges according •Harness andconnector
OPENING •
Change theIACV-AAC valve
tothe opening percent. •
IACV-AAC valve
opening percentusingCON-
SULT.
• Engine: Returntothe original
•Harness andconnector
ENG COOLANT trouble
condition
Iftrouble symptom disappears, •
Engine coolant temperature
• Change theengine coolant
.

TEMP see
CHECK ITEM. sensor
temperature indicationusing
•Fuel injectors
CONSULT .
• Engine: Returntothe original
trouble condition
Iftrouble symptom disappears,
IGNITION TIMING•Timing light:Set •
Adjust initialignition timing
• Retard theignition timingusingsee
CHECK ITEM.
CONSULT.
• Engine: Afterwarming up,idle •
Harness andconnector
the engine. •
Compression
POWER
•
AIC
switch "OFF"
Enginerunsrough ordies. •
Injectors
BALANCE •
Shift lever "N" •
Power transistor
• Cut offeach injector signalone •
Spark plugs
at atime using CONSULT . •
Ignition coils
• Ignition switch:ON
•Harness andconnector
COOLING FAN•
Turn thecooling fan"ON" andCooling
fanmoves andstops.
•Cooling fanmotor
"OFF" usingCONSULT .
• Ignition switch:ON(Engine
FUEL PUMP stopped)
Fuelpump relaymakes theoper- •
Harness andconnector
RELAY •
Turn thefuel pump relay"ON"
atingsound. •
Fuel pump relay
and "OFF" usingCONSULT
and listen tooperating sound.
EGRC •
Ignition switch:ON
• Turn solenoid valve"ON"and Solenoid
valvemakes anoperat- •
Harness andconnector
SOLENOID "OFF"withtheCONSULT andingsound. •
Solenoid valve
VALVE listentooperating sound.
SELF-LEARNING •
In this test, thecoefficient ofself-learning controlmixture ratioreturns tothe original coefficient by
CONT touching
"CLEAR" onthe screen.

EC-259
•

TROUBLEDIAGNOSIS -General Description
Sensors

~ ECMActuators

~~.~ MEF036D
SEF234G Introduction

The engine hasanECM tocontrol majorsystems suchasfuel
control, ignitioncontrol, idleaircontrol system, etc.The ECM
accepts inputsignals fromsensors andinstantly drivesactua-
tors. Itis essential thatboth input andoutput signals areproper
and stable. Atthe same time,itis important thatthere areno
problems suchasvacuum leaks,fouled sparkplugs, orother
problems withtheengine.
It is much moredifficult todiagnose aproblem thatoccurs
intermittently ratherthancontinuously. Mostintermittent prob-
lems arecaused bypoor electric connections orimproper wir-
ing. Inthis case, careful checking ofsuspected circuitsmay
help prevent thereplacement ofgood parts.
A visual checkonlymaynotfind thecause ofthe problems. A
road testwith CONSULT oracircuit testerconnected shouldbe
performed. Followthe"Work Flow"onthe next page.
Before undertaking actualchecks, takejustafew minutes to
talk with acustomer whoapproaches withadriveability com-
plaint. Thecustomer cansupply goodinformation aboutsuch
problems, especially intermittent ones.Findoutwhat symptoms
are present andunder whatconditions theyoccur. A"Diagnos-
tic Worksheet" liketheexample onEC-267 shouldbeused.
Start yourdiagnosis bylooking for"conventional" problems
first. Thiswillhelp troubleshoot driveabilityproblemsonan
electronically controlledenginevehicle.

EC-264

COMPRESSIONPRESSURE

20
mm
(O.79 In)dls.

Use compressor testerwhose end(rubber
portion) isless than 20mm (0.79 in)dia.
Otherwise, itmay becaught bycylinder
head during removal.

SEM387CMeasurement
ofCompression Pressure

1. Warm upengine.
2. Turn ignition switchoff.
3. Cut fuel line.
Release fuelpressure.
Refer to"Releasing FuelPressure" inEC section. •
4. Remove allspark plugs.
5. Disconnect distributorcentercable.
6. Attach acompression testertoNO.1 cylinder.
7. Depress accelerator pedalfullytokeep throttle valvewide
open.
8. Crank engine andrecord highest gaugeindication.
9. Repeat themeasurement oneach cylinder asshown above.

• Always useafully-charged batterytoobtain specified
engine revolution.
Compression pressure:
Unit:kPa(bar, kg/cm
2,
psi)/rpm
Compression Differencelimit
ratio
Standard
Refer toSOS Minimum
betweencylin-
(EM-155). ders
9.5 1,324
(13.24, 1,128(11.28,
13.5, 192)/350 11.5,164)/350
9.8 1,353
(1353, 1,157(11.57, 98(0.98, 1.0,14)/
13.8, 196)/350 11.8,168)/350
350
9.9 1,373
(13.7, 14, 1,177(11.8,12,
199)/350 171)/350

10.
If
compression inone ormore cylinders islow:
a. Pour asmall amount ofengine oilinto cylinders through
spark plugholes.
b. Re-test compression,

• Ifadding oilhelps compression, pistonringsmaybeworn
or damaged. Ifso, replace pistonringsafterchecking pis-
ton.
• Ifpressure stayslow,avalve maybesticking orseating
improperly. Inspectandrepair valveandvalve seat.Refer
to SOS (EM-156, 159).Ifvalve orvalve seatisdamaged
excessively, replacethem.
• Ifcompression stayslowintwo cylinder thatarenext to
each other:
The cylinder headgasket maybeleaking, or
both cylinders mayhave valve component damage.
Inspect andrepair asnecessary.
EM-15

TIMINGCHAIN
Without

VTC
CAUTION:
• After removing timingchain,donot turn crankshaft and
camshaft separately, orvalves willstrike piston heads.
• When installing camshafts, chaintensioner, oilseals, or
other sliding parts,lubricate contacting surfaceswithnew
engine oil.
• Apply newengine oiltobolt threads andseat surfaces when
installing cylinderhead,camshaft sprocket,crankshaft
pulley, andcamshaft brackets.
Removal

1. Drain engine coolant fromradiator andcylinder block.
Be careful nottospill coolant ondrive belts.
2. Release fuelpressure. '
Refer to"Releasing FuelPressure" inEG section.
3.. Remove thefollowing belts.
• Power steering pumpdrivebelt
• Alternator drivebelt
4. Remove powersteering pulleyandpump withbracket.
5. Remove airduct tointake manifold collector.
6. Remove frontright-side wheel.
7. Remove frontright-side splashcover.
8. Remove frontundercovers.
9. Remove frontexhaust tube.
10. Remove cylinderheadfrontmounting bracket.
11. Remove rockercover.
12. Remove distributor cap.
13. Remove allspark plugs.
14. Remove intakemanifold support.
15. Set NO.1 piston at
TOG
onitscompression stroke.

EM-20

WithoutVTC

Engine front
Unit: mm(in)
~(0.39)
~1-J--10 (0.39)

* -\

3 (0.12)
Z~
Liquid

gasket

SEM59BEA TIMING
CHAIN
Installation (Cont'd)

29. Apply liquidgasket torocker covergasket.

•

With VTC

Cylinderhead
'l:tJ

~ /2.0-3.0mm

Cylinder headfront cover
(0.079-0.118 In)
With
VTC

28. Apply liquidgasket tomating surfaces ofthe cylinder head
and cylinder headfrontcovers showninthe figure.

With VTC

Engine front

Unit: mm(in)
SEM091F

7~'\

\ ..... -4'

~-'?

~'0391

~10 (0.39)

*
--1

3 (0.12)
Zr.a
liquid

gasket

SEM111F
29.
Apply liquidgasket torocker covergasket.

Without VTC
With VTC
30.
Install rocker coverandtighten innumerical orderasshown
in the figure.
31. Install allspark plugsandleads.
32. Install engine frontmounting bracketandmounting.
33. Install frontexhaust tube.
34. Install frontundercover.
35. Install frontright.splash cover.
36. Install frontrightwheel.
37. Install aircleaner.
38. Install power steering pulleyandpump withbracket.
To check power steering fluid,refertoMA section ("Check-
ing Power Steering FluidandLines", "CHASSIS ANDBODY
MAINTENANCE").
39. Drive belts.
For adjusting drivebeltdeflection, refertoMA section
("Checking DriveBelts", "ENGINE MAINTENANCE").

EM-29

VALVECLEARANCE
1 1 22
2 2 44
SEM140D Checking
Check valveclearance whileengine iswarm andnotrunning.

1. Remove rockercover.
2. Remove allspark plugs.
3. Set
NO.1
cylinder atTOC onitscompression stroke.
• Align pointer withTOC mark oncrankshaft pulley.
• Check thatvalve lifters on
NO.1
cylinder areloose andvalve
lifters on
NO.4
aretight.
If not, turn crankshaft onerevolution (360°)andalign as
above.
4. Check onlythose valves showninthe figure.
• Using afeeler gauge, measure clearance betweenvalve
lifter andcamshaft.
• Record anyvalve clearance measurements whichareoutof
specification. Theywillbeused latertodetermine the
required replacement adjustingshim.

Valve clearance forchecking (Hot):
Intake 0.21 -0.49 mm(0.008 .0.019 in)
Exhaust 0.30. 0.58mm(0.012 -0.023 in)

5. Turn crankshaft onerevolution (360°)andalign markon
crankshaft pulleywithpointer.
6. Check thosevalves shown inthe figure.
• Use thesame procedure asmentioned instep 4.
7. Ifall valve clearances arewithin specification, installthe
following parts.
• Rocker cover
• Allspark plugs
•

"-

Tool (A}KV10115110

,

SEM141DAdjusting
Adjust valveclearance whileengine iscold.

1. Turn crankshaft, toposition camlobeoncamshaft ofvalve
that must beadjusted upward.
2. Place Tool(A)around camshaft asshown infigure.

Before placing Tool(A),rotate notchtoward centerofcylinder
head (Seefigure.), tosimplify shimremoval later.
CAUTION: Be careful nottodamage camsurface withTool (A).
EM-41