1995 NISSAN ALMERA N15 ECO mode

TROUBLEDIAGNOSIS FORDTC34
Knock Sensor (KS)

The knock sensor isattached tothe cylinder block.Itsenses
engine knocking usingapiezoelectric element.Aknocking

vibr
ion
fromthecylinder blockissensed asvibrational pres-
sure. Thispressure is
converted
intoa
voltage
signalandsent
to the ECM.

PIEZO-ELEMENT SEF598K

Diagnostic
Trouble Code Malfunctionisdetected when....
No.
34 •An excessively loworhigh voltage fromtheknock
sensor issent toECM. Check
Items
(Possible Cause)
• Harness orconnectors
(The knock sensor circuitisopen orshorted.)
• Knock sensor

DIAGNOSTIC TROUBLECODECONFIRMATION
PROCEDURE

fiii\
1)Turn ignition switch"ON"andselect "DATA

\J!}
MONITOR" modewithCONSULT.
2) Start engine andrunitfor atleast 5seconds atidle
speed.

----------OR -----------

1) Start engine andrunitfor atleast 5seconds atidle
speed.
2) Turn ignition switch"OFF", waitatleast 7seconds
and then turn"ON".
3) Perform "Diagnostic TestMode II"(Self-diagnostic
results) withECM.

EC-306

TROUBLEDIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)
OVERALL FUNCTION CHECK

"*
MONITOR *NO FAIL
0

THRTL
pas
SEN 0.48V

I- I~-----..l

~-R-E-CO-R-D-~I

SEF477QUse
thisprocedure tocheck theoverall function ofthe throttle
position sensor.Duringthischeck, aDTC might notbecon-
firmed.

rij\
1)

~ 2)
Turn
ignition switch"ON".
Select "MANU TRIG"and"HISPEED" in"DATA
MONITOR" modewithCONSULT.
3) Select "THRTL POSSEN" in"DATA MONITOR" mode
with CONSULT.
4) Press RECORD onCONSULT SCREENatthe same
time accelerator pedalisdepressed.
5) Print outthe recorded dataandcheck thefollowing:
• The voltage whenaccelerator pedalfullyreleased
is approximately 0.35-0.65V .
• The voltage riseislinear inresponse toaccelera-
tor pedal depression .
• The voltage whenaccelerator pedalfullydepressed
is approximately 4V.

---------- OR----------

1) Turn ignition switch"ON",
2) Check thevoltage between ECMterminals
@J
and
@,
@
(ground) andcheck thefollOWing:
• The voltage whenaccelerator pedalfullyreleased
is approximately 0.35-0.65V.
• The voltage riseislinear inresponse toaccelera-
tor pedal depression.
• The voltage whenaccelerator pedalfullydepressed
is approximately 4V,

THRTL

15:38 ~~~
(V)
00"46 2.88
00"47 3.00
00"48 3.12
00"49 3.24
00"50 3.34
00"51 3.46
00"52 3.56

SEF267Q
OK
data

THRTL
pos
SEN
OO~

~~~'3. 1
'g;v :":'

................. 1

MEC7228
~i)
ECM
El'coNNEcTORII

LelJ
(9"oodl

II
THRTl

15:38 ~~~
(V)

00"36 214
00"37 2.20
00"38 2.26
00"39 2.32
00"41 2.26
00"42 2.20
00"43 2.58

NG
data
THFm.
pos
SEN 00"00

'~U. '3
~v ~:'

•

")
•...•..•..• 1

EC-310

•

DIAGNOSTIC
PROCEDURE

INSPECTION START
Vehicle
speed
sensor

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Vehicle SpeedSensor (VSS)(Conl'd)
COMPONENT DESCRIPTION

The vehicle speedsensor isinstalled inthe transaxle. Itcon-
tains apulse generator whichprovides avehicle speedsignal
to the speedometer. Thespeedometer thensends asignal to
the ECM.

AEC110
• V~HICLE SPEEDSENCKT.
AFTER TOUCH START.
DRIVE VEHICLE
AT lOkm!h (6mph)OR
MORE WITHIN 15
see

L--- __ '~----'

-N-EX-T
-1I=~_s-T_A~R=T==

MEF559D
*
MONITOR
*
NO FAIL
0

VHCL SPEED SE20kmlh
PIN POSI SW OFF CHECK
OVERALL FUNCTION.
1. Jack updrive wheels.

fi\
2.Perform "VEHICLE SPEED
~ SENCKT" in"FUNCTION
TEST" modewithCONSULT.

OR

rif\
2.Read "VHCl SPEED SE"sig-
~ nalin"DATA MONITOR"
mode withCONSULT.
CONSULT valueshould bethe
same asthe speedometer indi-
cation.
OK

INSPECTION END

RECORD SEF941N

~ CONNECT
f?Ft::J:.~

~£) ~~

1='
=E=CM=-g
CONNECTOR
II~

32
~l

MEC3238
OR

2. Turn ignition switch"ON".
3. Rotate drivewheel byhand.
4. Check voltage between ECM
terminal
@
and body ground.
Voltage shouldvarybetween
approx. 0-5V.

NG

CHECK SPEEDOMETER FUNCTION.
Make surethatspeedometer functions
properly.

OK NG

Check vehicle speedsen-
sor and circuit.
(Refer to"Inspection!
Speedometer andVehicle
Speed Sensor" of
"METER ANDGAUGES"
in El section.)

@
EC-315

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Start Signal (Cont'd)
DIAGNOSTIC PROCEDURE
• START SIGNAL CKT•

INSPECTIONSTART

fa CHECK OVERALL FUNCTION.

(ij\
1,Turn ignition switch"ON",
~ 2,Perform "STARTSIGNALCKT"
in "FUNCTION TEST"mode
with CONSULT,

OR

rif\
1,Turn ignition switch"ON",
~ 2,Check "START SIGNAL" in
"DATA MONITOR" modewith
CONSULT,

1
CLOSE THROTILE, SHIFT
TO POR NRANGE
2 TOUCH STARTAND
START ENGINE
IMMEDIATELY

NEXT
II
START

fa
-(:(MONITOR -(:(NO FAIL

0

START SIGNAL OFF
CLSDTH/PSW ON
AfRCONDSIG OFF
PIN POSI SW ON
SEF191L

IGN"ON"

IGN "START"
OFF
ON OK

INSPECTION END

___ RE_C_O_R_D __
I

SEF111P

Checkthefollowing,
• Harness connectors

@,@

• 7,5A fuse
• Harness foropen or
short between ECMand
ignition switch
If NG, repair harness or
connectors,

NG
CHECK INPUTSIGNAL CIRCUIT.

1, Turn ignition switch"OFF",
2, Disconnect ECMharness connector
and ignition switchharness connec-
tor,
3, Check harness continuity between
ECM terminal
@
and terminal
@,

Continuity shouldexist.

If OK, check harness forshort

OK

OR

1, Turn ignition switchto
"START",
2 Check voltage between ECM
terminal
@
and ground,

Voltage: Ignition switch"START"
Battery voltage
Exceplabove
Approximately OV
MEC725B

~15
~

t:1tlliJ

~i3

ECM
E[CONNECTORII

34
~

II

ECM ~CONNECTORI
34

Disconnectandreconnect-harness con-
nectors inthe circuit Thenretest
Trouble isnot fixed,

MEC760B
Check
ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector, ReconnectECMhar-
ness connector andretest
INSPECTION END

EC-318

•

INSPECTION
START

m
CHECK OVERALL FUNCTION.
~INSPECTION
END
1. Start engine andwarm itup suffi-
ciently.
2. Perform diagnostic testmode II(Self-
diagnostic results).
Make surethatDiagnostic trouble
code No.12isnot displayed.
3. Keep
engine speedatabout 2,000
rpm. Make surethatEGR valve
spring moves upand down when
engine israced toabout 4,000rpm.
(Use yourfinger.)
NG

m
CHECK VACUUM SOURCETOEGR OK
CHECK COMPONENTS

----..

VALVE. (EGR
valve andEGRC-
1. Disconnect vacuumhosetoEGR BPT
valve).
valve. Refer
to"COMPONENT
2. Disconnect
vacuumhosetoEVAP INSPECTION",
EC-323
canister.
3. Check vacuum existence underthe NG
following conditions.
Engine speedis4,000 rpm:
Vacuum shouldnotexist.
Replacemalfunctioning
Engine speedis2,000 rpm:
component(s).
Vacuum shouldexist.
NG

[!J
(!]

CHECK CONTROL FUNCTION. OK
CHECK VACUUM HOSE.

-----.-

Check voltage between ECMterminal Check
vacuum hosefor

@
andground underthefollowing clogging,
cracksor
conditions. improper
connection.
Engine speedis4,000 rpm
0.6 -O.BV
Engine speedis2,000 rpm
Battery voltage
~NG

+
-
MEF637B
MEF955D
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[1[J

Exhaust GasRecirculation (EGR)Valveand
EVAP Canister PurgeControl (Cont'd)
DIAGNOSTIC PROCEDURE

~)5
~~II
EGRC-BPT valve
~~uu~ hose
connected toEGR valve~

(
~
'

MEC761B
Clogging

[!J

r----, ~
CONNECT

II
ECM ~CONNECTORIIl.imJ
£)

105

::::.S.-

~P"P"
'00","'00

MEF521E
EC-321

Checkthefollowing.
• Harness connectors

QD,@

• 10A fuse
• Harness openorshort
between EGRvalve
&

EVAP canister purge
control solenoid valve
and fuse
If NG, repair harness or
connectors.

NG

CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect EGRvalve
&
EVAP canis-
ter purge control solenoid valvehar-
ness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground.

Voltage: Batteryvoltage
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Exhaust GasRecirculation (EGR)Valveand

_~ ~EVAPcanis:r PurgeControl (Cont'd)

\

~GR valve
&
EVAP
------ canistercontrolsolenoid
valve harness connector

,----,
-----
.
\
\
\

I
I
MEC7638
CHECKOUTPUT SIGNALCIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector.
3. Check harness continuity between
ECM terminal
(ill)
andterminal
CD.

Continuity shouldexist.

If OK, check harness forshort.
NG

Repair harness orcon-
nectors.

MEC7648 OK

~i5

1=1
=E=CM=-g CONNECTOR
II

105

MEC7658
• EGR CONT S/VCIRCUIT.
DOES THESOLENOID
VALVE MAKE
AN OPERATING SOUND
EVERY 3SECONDS?
NEXT
II
NO
II
YES
I

MEF5698 CHECK
COMPONENT

(EGR valve
&
EVAP canister purgecon-
trol solenoid valve).

(ij\
1.Reconnect ECMharness con-
~ nectorandEGR valve
&
EVAP
canister purgecontrol sole-
noid valve harness connector.
2. Turn ignition switch"ON".
3. Perform "EGRCSOLIV
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.

OR

(F./)
3.Turn EGRvalve
&
EVAP can-
~ isterpurge control solenoid
valve "ON"and"OFF" in
"ACTIVE TEST"modewith
CONSULT andcheck operat-
ing sound.

OR

~ Referto"COMPONENT
~ INSPECTION" onnext page.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
NG

Replace EGRvalve
&

EVAP canister purgecon-
trol solenoid valve.
• ACTIVE TEST.
0

EGRC SOL/V
0N

== =
MONITOR
== =

CMPS.RPM (REF)Orpm Trouble
isnot fixed .
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

ON
I_I
OFFl
clEF353F
EC-322

•

INSPECTION END
Check thefollowing.
• Harness connectors

@,@

• Harness connectors

@,

• Harness foropen or
short between injector
and ignition switch
If NG, repair harness or
connectors.

OK
NG
OK

@

INSPECTION
START

DIAGNOSTIC
PROCEDURE
CHECK OVERALL FUNCTION.

(ij\
1.Start engine.
~ 2.Perform "POWER BALANCE"
in "ACTIVE TEST"modewith
CONSULT.
3. Make surethateach circuit
produces amomentary engine
speed drop.

OR

~ 1.Start engine.
~ 2.Listen toeach injector operat-
ing sound.

Clicking noiseshould be
heard.
CHECK POWER SUPPLY.
SEF730L
1.Stop engine.
2. Disconnect injectorharness connec-
tor.
3. Turn ignition switch"ON".
4. Check voltage between injectorhar-
ness connector terminal
@
and
ground withCONSULT ortester.

Voltage: Batteryvoltage
SEF596K
I~~
Click

Ct.
I~-+

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Injector
{Cont'd)

COMPONENT DESCRIPTION

The fuel injector isasmall, precise solenoid valve.Whenthe
ECM supplies aground tothe injector circuit,thecoil inthe
injector isenergized. Theenergized coilpulls theneedle valve
back andallows fueltoflow through theinjector intotheintake
manifold. Theamount offuel injected depends upontheinjec-
tion pulse duration. Pulseduration isthe length oftime the
injector remains open.TheECM controls theinjection pulse
duration basedonengine fuelneeds.

• ACTIVE TEST.
0

••• POWER BALANCE •••

= ==
MONITOR
=
=
=

CMPS.RPM(REF) 737rpm
MAS AIR/FL SENO.98V
IACV-AACjV 41%

110Q]~~

DDDDL:::J
MEF354F

--
/1

MEF960AAEC755 EC-325

Replacefuelpump relay.

NG
CHECK COMPONENT

(Fuel pump relay).

(ij\
1.Reconnect fuelpump relay,
~ fuelpump harness connector
and ECM harness connector.
2. Turn ignition switch"ON".
3. Turn fuelpump relay"ON"
and "OFF" in"ACTIVE TEST"
mode withCONSULT and
check operating sound.

OR

fti>\
Referto"COMPONENT
~ INSPECTION" onnext page.

OK
MEC332B
D
ON
Orpm

---
---

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Coni'd)

@

1

• ACTIVE TEST.
FUEL PUMP RELAY

= = =
MONITOR
CMPS.RPM(REFj
~i5

ECM
B
CONNECTOR
II

104

II

_o_N_I_'
OFF
I

MEF309F
CHECK
COMPONENT
(Fuel pump).
Refer to"COMPONENT INSPECTION"
on next page.
NG

Replace fuelpump.

OK

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

EC-330