sensor NISSAN ALMERA N15 1995 Manual Online

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
CONSULT (Cont'd)
FUNCTION
Diagnostictestmode
Function
A technician canadjust somedevices
Work support
fasterandmore accurately byfollowing
indications onCONSULT.
Self-diagnostic results Self-diagnostic
resultscanberead and
erased quickly.
Data monitor
Input/Outputdatainthe ECM canberead.
CONSUL Tdrives someactuators apart
Active test
fromtheECM's andalso shifts some
parameters inaspecified range.
ECM partnumbers ECMpartnumbers canberead.
Conducted byCONSULT insteadofatech-
Function test
niciantodetermine whethereachsystem
is "OK" or"NG".
WORK SUPPORT MODE
WORK ITEM
CONDITION USAGE
THRTL POSSENADJ
CHECKTHETHROTTLE POSITIONSENSORSIGNAL. Whenadjusting throttleposition
ADJUST iTTO THE SPECIFIED VALUEBYROTATING
sensorinitialposition
THE SENSOR BODYUNDER THEFOLLOWiNG CONDI-
TIONS .
• IGN SW"ON"
• ENG NOTRUNNING
• ACC PEDAL NOTPRESSED
IGNITION TIMINGADJ
•IGNITION TIMINGFEEDBACK CONTROLWILLBE Whenadjusting initialignition
HELD BYTOUCHING "START".AFTERDOINGSO,
timing
ADJUST IGNITION TIMINGWITHATIMING LIGHTBY
TURNING THECAMSHAFT POSITIONSENSOR.
IACV-AAC VALVEADJ SETENGINE SPEEDATTHE SPECIFIED VALUEUNDER

-

THE FOllOWING CONDITIONS.
• ENGINE WARMED UP
• NO-LOAD
FUEL PRESSURE RELEASE •FUEL PUMP WillSTOP BYTOUCHING "START" Whenreleasing fuelpressure
DURING IDLING. fromfuelline
CRANK AFEW TIMES AFTER ENGINE STALLS.
EC-50

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
CONSULT (ConI'd)
SELF-DIAGNOSTIC MODE
Regarding itemsdetected in"SELF-DIAG RESULTS"mode,referto"Diagnostic TroubleCode(DTC)
Chart" (RefertoEC-62.)
DATA MONITOR MODE

Monitored item ECM
Main
[Unit] input
signals Description
Remarks
signals
CMPS.RPM •Indicates theengine speedcomputed •Accuracy becomespoorifengine
(REF) [rpm]

00
from
theREF signal (180'signal) of
speeddropsbelow theidle rpm.
the camshaft positionsensor.
•Ifthe signal isinterrupted whilethe
engine isrunning, anabnormal value
may beindicated .
MAS AIR/FL SE[V]

0 0
•
The signal voltage ofthe mass air
•When theengine isstopped, acertain
flow sensor isdisplayed .
valueisindicated.
COOLAN TEMP/S
•The engine coolant temperature •When theengine coolant temperature
['C] or['F]

00
(determined
bythe signal voltage of
sensorisopen orshort-circuited,
the engine coolant temperature sen-ECMenters fail-safe mode.The
sor) isdisplayed.
enginecoolant temperature deter-
mined bythe ECM isdisplayed .
02 SENSOR [V]

00
•
The signal voltage ofthe oxygen sen-
sor*1 isdisplayed .
M/R F/CMNT •
Display ofoxygen sensorsignaldur-
•After turning ONthe ignition switch,
[RICH/LEAN] ingair-fuel ratiofeedback control: "RICH"isdisplayed untilair-fuel mix-
RICH ...means themixture became
tureratio feedback controlbegins.

0 0
"rich",
andcontrol isbeing affected •When theair-fuel ratiofeedback is
toward aleaner mixture.
clamped,thevalue justbefore the
LEAN ...means themixture became clampingisdisplayed continuously.
"lean", andcontrol isbeing affected
toward arich mixture .
VHCL SPEED SE

00
•
The vehicle speedcomputed fromthe
[km/h] or[mph] vehicle
speedsensor signalisdis-
played .
BATTERY VOLT[V]

0 0
•
The power supply voltage ofECM is
displayed .
THRTL POSSEN[V]

0 0
•
The throttle position sensorsignal
voltage isdisplayed.
INT/A TEMP SE['C] •The intake airtemperature deter-
or ['F]*2

0
mined
bythe signal voltage ofthe
intake airtemperature sensorisindi-
cated .
START SIGNAL

00
•
Indicates [ON/OFF] conditionfromthe•After starting theengine, [OFF]isdis-
[ON/OFF] startersignal. playedregardless ofthe starter sig-
nal.
CLSD THLIPOSI •Indicates theclosed throttle position
[ON/OFF]

00
[ON/OFF]
determined bythe throttle
position sensorsignal.
ON: Closed throttle position
OFF: Other thanclosed throttle position
AIR COND SIG

00
•
Indicates [ON/OFF] conditionofthe
[ON/OFF] air
conditioner switchasdetermined
by the airconditioning signal.
PIN POSI SW

00
•
Indicates [ON/OFF] conditionfromthe
[ON/OFF] park/neutralpositionswitchsignal.
PW/ST SIGNAL •
Indicates [ON/OFF] conditionofthe
[ON/OFF]
00
power
steering oilpressure switch
determined bythe power steering oil
pressure signal.

NOTE:
Any monitored itemthatdoes notmatch thevehicle beingdiagnosed isdeleted fromthedisplay auto-
matically.

*1: Heated oxygen sensor(ForEurope andIsrael, andAustralia A/Tmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia A/Tmodels)
*2: For Australia

EC-51
•

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
•

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

FUNCTION TEST
CONDITION
ITEM JUDGEMENT
CHECKITEM(REMEDY)
• Ignition switch:ON
SELF-DIAG (Enginestopped)
RESULTS
-

Objective
system
• Displays theresults ofon-
board diagnostic system.
• Ignition switch:ON
•Harness andconnector
(Engine stopped)
Throttlevalve:opened OFF
•Throllle position sensor
• Closed throllle position is
•Throllie position sensor
CLOSED THROTTLE
testedwhenthrottle is
POSI openedandclosed fully. adjustment
(Closed throllieposition is •
Throttle linkage
selected bythrottle posi- Throttle
valve:closed
ON•
Verify operation inDATA
tion sensor.) MONITOR
mode.
• Ignition switch:ON •
Harness andconnector
(Engine stopped) •
Throttle position sensor
THROTTLE POSI•Throllle position sensor Range
(Throllle valvefully
Morethan •
Throllle position sensor
SEN CKT
circuitistested when opened
-Throllle valve
3.DV adjustment
throllie isopened and fully
closed) •Throllie linkage
closed fully. •
Verify operation inDATA
MONITOR mode.
• Ignition switch:ON
•Harness andconnector
(Engine stopoed) Out
ofNIP positions OFF
PARK/NEUT POSI
•Inhibitor/NelJlral position •
Neutral position switchor
SW CKT switchcircuit istested inhibitor
switch
when shiftlever ismanip-
InNIP positions ON•
Linkage orinhibitor switch
ulated . adjustment
• Ignition switch:ON
•Harness andconnector
(Engine stopped)
•Fuel pump
FUEL PUMP •Fuel pump circuit istested
Thereispressure pulsation onthe fuel
•Fuel pump relay
CIRCUIT bychecking thepulsation feedhose.
in fuel pressure whenfuel •
Fuel filter clogging
tube ispinched . •
Fuel level
• Ignition switch:ON
EGRC SOllV (Engine
stopped)
•Harness andconnector
CIRCUIT (EVAPcan-•EVAP canister purgecon-
•EVAP canister purgecon-
ister purge control trolsolenoid valveorEGR
Thesolenoid valvemakes anoperating trolsolenoid valveorEGR
solenoid valveor
valve
&
EVAP canister
soundevery3seconds. valve

&
EVAP canister
EGR valve
&
EVAP purgecontrol solenoid
purgecontrol solenoid
canister purgecon- valvecircuit istested by
valve
trol solenoid valve) checkingsolenoidvalve
operating noise.
• Ignition switch:ON
(Engine stopped) •
Harness andconnector
VALVE TIMING SIV•Valve timing SIVcircuit isThe
solenoid valvemakes anoperating •
Valve timing solenoid
CKT*1 testedbychecking sole-soundperiodically. valve
noid valve operating
sound
'1: GA16DE exceptforEurope andIsrael

EC-54

ON-BOARDDIAGNOSTIC SYSTEMDESCRIPTION
CONSULT (Conl'd)

FUNCTION TEST
CONDITION JUDGEMENT
ITEM CHECK
ITEM(REMEDY)
• Ignition switch:ON
COOLING FAN (Engine
stopped)
Thecooling fanrotates andstops every •
Harness andconnector
CIRCUIT •
Cooling fancircuit is
3seconds. •
Cooling fanmotor
tested whencooling fanis
•Cooling fanrelay
rotated .
• Ignition switch:ON-.
START
• Start signal circuit is
tested whenengine is
started byoperating the
starter. Beforecranking,
START SIGNAL batteryvoltage andengine
Startsignal: OFF-.ON •
Harness andconnector
CIRCUIT coolanttemperature are •
Ignition switch
displayed. During
cranking, averagebattery
voltage, massairflow
sensor outputvoltage and
cranking speedaredis-
played .
• Ignition switch:ON
(Engine running)
Lockedposition ON
•Harness andconnector
PW/ST SIGNAL •
Power steering circuitis
•Power steering oilpres-
tested whensteering
CIRCUIT wheelisrotated fullyand sure
switch
then settoastraight lineNeutral
position OFF•
Power steering pump
running position.
• Vehicle speedsensor cir-
•Harness andconnector
VEHICLE SPEED cuit
istested whenvehicle Vehicle
speedsensor inputsignal is
•Vehicle speedsensor
SEN CKT is
running ataspeed of10 greater
than4km/h (2MPH)
•Electric speedometer
km/h (6MPH) orhigher .
• After warming up,idle the
engine. •Adjust ignition timing(by
• Ignition timingadjustment
movingcamshaft position
IGN TIMING ADJ is
checked byreading The
timing lightindicates thesame
sensorordistributor)
ignition timingwithatim- value
onthe screen.
•Camshaft positionsensor
ing light andchecking
drivemechanism
whether itagrees with
specifications.
•INJECTION SYS(Injector,
fuel pressure regulator,
harness orconnector)
• Air-fuel ratiofeedback cir- •
IGNITION SYS(Spark
cuit (injection system,igni- plug,
power transistor,
tion system, vacuum ignition
coil,harness or
MIXTURE RATIO system,
etc.)istested byOxygen
sensor'1 COUNT:Morethan5 connector)
TEST examining
theoxygen times
during 10seconds •
VACUUM SYS(Intake air
sensor'1 outputat2,000 leaks)
rpm under non-loaded •
Oxygen sensor'1 circuit
state. •
Oxygen sensor'1 opera-
tion
• Fuel pressure highorlow
• Mass airflow sensor
'1: Heated oxygen sensor(ForEurope andIsrael, andAustralia AITmodels)
Oxygen sensor(Except forEurope andIsrael, andAustralia
A/T
models)

EC-55
•

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

STEP
STEP I
STEP II
STEP III
STEP IV
STEP V
STEP VI
STEP VII
TROUBLE
DIAGNOSIS -General oescrip_ti_on
I_G_A_'

Description forWork Flow

DESCRIPTION
Get detailed information abouttheconditions andtheenvironment whentheincident/symptom occurred
using the"DIAGNOSTIC WORKSHEET" asshown onthe next page.
Before confirming theconcern, checkandwrite down (printoutusing CONSULT) theDiagnostic Trouble
Code (DTC), thenerase thecode. TheDTC canbeused when duplicating theincident atSTEP III
&
IV.
Study therelationship betweenthecause, specified byDTC, andthesymptom described bythe customer.
(The "Symptom MatrixChart" willbeuseful. RefertoEC-72.)
Try toconfirm thesymptom andunder whatconditions theincident occurs.
The "DIAGNOSTIC WORKSHEET" isuseful toverify theincident. ConnectCONSULT tothe vehicle inDATA
MONITOR (AUTOTRIG)modeandcheck realtime diagnosis results.
If the incident cannotbeverified, performINCIDENT SIMULATION TESTS.RefertoGI section.
If the malfunction codeisdetected, skipSTEP IVand perform STEPV.
Try todetect theDiagnostic TroubleCode(DTC) bydriving in(or performing) the"DTC CONFIRMATION
PROCEDURE". Checkandread theDTC byusing CONSULT.
During theDTC verification, besure toconnect CONSULT tothe vehicle inDATA MONITOR (AUTOTRIG)
mode andcheck realtime diagnosis results.

If
the incident cannotbeverified, performINCIDENT SIMULATION TESTS.RefertoGI section.
In case the"DTC CONFIRMATION PROCEDURE"isnot available, performthe"OVERALL FUNCTION
CHECK" instead.TheDTC cannot bedisplayed bythis check, however, thissimplified "check"isan effec-
tive alternative.
The "NG" result ofthe "OVERALL FUNCTIONCHECK"isthe same asthe DTC detection.
Take theappropriate actionbasedonthe results ofSTEP Ithrough IV.
If the malfunction codeisindicated, proceedtoTROUBLE DIAGNOSIS FORDTCXX.
If the normal codeisindicated, proceedtothe BASIC INSPECTION. RefertoEC-65. Thenperform inspec-
tions according tothe Symptom MatrixChart.RefertoEC-72.
Identify wheretobegin diagnosis basedonthe relationship studybetween symptom andpossible causes.
Inspect thesystem formechanical binding,looseconnectors orwiring damage using(tracing) "Harness
Layouts".
Gently shaketherelated connectors, components orwiring harness withCONSULT setin"DATA MONITOR
(AUTO TRIG)" mode.
Check thevoltage ofthe related ECMterminals ormonitor theoutput datafrom therelated sensors with
CONSULT. RefertoEC-74.
The "DIAGNOSTIC PROCEDURE" inEC section contains adescription basedonopen circuit inspection. A
short circuit inspection isalso required forthe circuit checkinthe DIAGNOSTIC PROCEDURE. Fordetails,
refer toGI section ("HOWTOPERFORM EFFICIENT DIAGNOSIS FORANELECTRICAL INCIDENT","Circuit
Inspection' ').
Repair orreplace themalfunction parts.
Once youhave repaired thecircuit orreplaced acomponent, youneed torun theengine inthe same condi-
tions andcircumstances whichresulted inthe customer's initialcomplaint.
Perform the"DTC CONFIRMATION PROCEDURE"andconfirm thenormal code(Diagnostic troublecodeNo.
55) isdetected. Ifthe incident isstill detected inthe final check, perform STEPVIby using adifferent
method fromtheprevious one.
Before returning thevehicle tothe customer, besure toerase theunnecessary (alreadyfixed)DTCinECM.
Refer toEC-46.

EC-60

TROUBLEDIAGNOSIS -General Description
Diagnostic TroubleCode(DTC) Chart
ENGINE RELATED ITEMS

Detected items
Diagnostic
trouble code
(ScreentermsforCONSULT, Malfunction
isdetected when...
No. "SELF-DIAG RESULTS"mode)
11 Camshaftpositionsensorcircuit
•Either
l'
or 180' signal isnot detected bythe ECM forthe first few
(CAMSHAFT POSISEN)
secondsduringengine cranking .
• Either
l'
or 180' signal isnot detected bythe ECM often enough
while theengine speedishigher thanthespecified rpm.
• The relation between
l'
and 180' signals isnot inthe normal range
during thespecified rpm.
12 Massairflow sensor circuit
•An excessively highorlow voltage isentered toECM.
(MASS AIRFLOW SEN) •Voltage senttoECM isnot practical whencompared withthecam-
shaft position sensorsignalandthrottle position sensorsignal.
13 Enginecoolant temperature sen-•An excessively highorlow voltage fromthesensor isdetected by
sor circuit
theECM.
(COOLANT TEMPSEN)
21 Ignitionsignalcircuit
•The ignition signalinthe primary circuitisnot detected bythe ECM
(IGN SIGNAL-PRIMARY)
duringengine cranking orrunning .
28*1 OVERHEAT •The engine coolant temperature sensoroutputvoltage isbelow
0.35V .
34"2 Knocksensor circuit •An excessively loworhigh voltage fromthesensor isdetected by
(KNOCK SENSOR) theECM.
41 *3 Intakeairtemperature sensorcir-•An excessively highorlow voltage fromthesensor isdetected by
cuit theECM.
(INT AIRTEMP SEN) •Voltage senttoECM isnot practical whencompared withtheengine
coolant temperature sensorsignal.

55
Nofailure •No malfunction isdetected bythe ECM.
(NO SELF DIAGNOSTIC FAILURE
INDICATED ...)
"1: Except forAustralia
*2: Except forEurope andIsrael
"3: For Australia
*4: This isQuick Reference of"DTC CONFIRMATION PROCEDURE".
Details aredescribed ineach TROUBLE DIAGNOSIS FORDTCXX
Abbreviations areasfollows:
IGN: ON :Turning theignition switchONisrequired forthe ECM todetect amalfunction (ifone exists).
RUNNING: Runningengineisrequired forthe ECM todetect amalfunction (ifone exists).
*5: •The "OVERALL FUNCTIONCHECK"isasimplified andeffective waytoinspect acomponent orcircuit.
In some cases, the"OVERALL FUNCTIONCHECK"isused rather thana"DIAGNOSTIC TROUBLECODECONFIRMA-
TION PROCEDURE".
When noDTC CONFIRMATION PROCEDUREisavailable, the"NG" result ofthe OVERALL FUNCTION CHECKcanbe
considered tomean thesame asaDTC detection .
• During an"NG" OVERALL FUNCTION CHECK,theDTC might notbeconfirmed.

EC-62

TROUBLEDIAGNOSIS -General Description
mJ

Diagnostic TroubleCode(DTC) Chart(Cont'd)

X:Applicable
-: Not applicable
"DTC *4
*5
Check Items CONFIRMATION
"OVERALLFUNC-Fail ReferencePage
(Possible Cause) PROCEDURE"
TIONCHECK" Safe
Quick Ref. QuickRef. System
• Harness orconnectors
(The sensor circuitisopen orshorted.)
• Camshaft positionsensor
RUNNING EC-94

-
-

• Starter motor
• Starting systemcircuit(ELsection)
• Dead (Weak) battery
• Harness orconnectors
.

(The sensor circuitisopen orshorted.) RUNNING
RUNNING
X
EC-101
• Mass airflow sensor
• Harness orconnectors
(The sensor circuitisopen orshorted.) IGN:ON
-

X
EC-108
• Engine coolant temperature sensor
• Harness orconnectors
(The ignition primary circuitisopen orshorted.)
• Power transistor unit RUNNING
-
-
EC-113
• Camshaft positionsensor
• Camshaft positionsensorcircuit
• Harness orconnector IGN:
ON
EC-108

- -

• Engine coolant temperature sensor (after
warming up)
• Harness orconnectors
(The sensor circuitisopen orshorted.) RUNNING
-
-
EC-119
• Knock sensor
• Harness orconnectors
(The sensor circuitisopen orshorted.)
IGN:ON
-
-
EC-124
• Intake airtemperature sensor
• No failure

----

EC-63
•

TROUBLEDIAGNOSIS -General Description
Fail-Safe Chart

The ECM enters fail-safe mode,ifany ofthe following DTCsisrecorded duetothe open orshort circuit.

DTC No. Detected
items
Engineoperating conditioninfail-safe mode
12 Massairflow sensor
Enginespeedwillnotrise more than3,000 rpm*1 duetothe fuel cut.
circuit
13 Engine
coolant tem-
Engine coolant temperature willbedetermined basedonthe time after turning ignition
perature sensorcir-switch "ON"or"START".
cuit ExceptforEurope andIsrael
Condition Enginecoolant temperature decided
Just asignition switchisturned ONorStart 30'C(B6'F)
More than5minutes afterignition ONorStart BO'G
(176'F)
Except asshown above 30
-BO'C (B6-176'F)
(Depends onthe time)
For Europe andIsrael
Condition Enginecoolant temperature decided
Just asignition switchisturned ONorStart 35'C
(95'F)
More than4.5minutes afterignition ONor
BO'G(176'F)
Start
Except asshown above 35
-BO'C (95-176'F)
(Depends onthe time)
When thefail-safe systemforengine coolant temperature sensorisactivated, thecooling
fan operates whileengine isrunning.
43 Throttle position Throttle
position willbedetermined basedonthe injected fuelamount andtheengine
sensor circuit speed.
Therefore, acceleration willbepoor.
Condition Driving
condition
When engine isidling Normal
When accelerating Poor
acceleration

-
ECM
Fail-safe
systemactivating conditionwhenECMismalfunctioning

The computing functionofthe ECM wasjudged tobe malfunctioning.
When thefail-safe systemactivates (i.e.,ifthe ECM detects amalfunction conditionin
the CPU ofECM), theMALFUNCTION INDICATORLAMPonthe instrument panellightsto
warn thedriver.

Engine control, withfail-safe system,operates whenECMismalfunctioning

When thefail-safe systemisoperating, fuelinjection, ignitiontiming,fuelpump
operation, IACV-AACvalveoperation andcooling fanoperation arecontrolled undercer-
tain limitations.
Operation

Engine speed Engine
speed
will
notrise more than3,000 rpm

Fuel injection Simultaneous
multipartfuelinjection system
Ignition timing Ignition
timingisfixed atthe preset valve
Fuel pump Fuel
pump' relayis"ON" when engine isrunning and"OFF" whenengine
stalls
IACV-AAG valve Full
open
Cooling fans Cooling
fanrelay "ON" whenengine isrunning, and"OFF" whenengine
stalls
EC-64