1995 NISSAN ALMERA N15 Service Manual

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS[][]
Vehicle SpeedSensor (VSS)

~ R/Y
.j~
R/Y
,!1J-
R/Yi4~VEHICLE
1'TIO\1iETt\i\
~11E:w'l\ )
SPEED

~ I
'C!Qy ~
I
\Ee!6I
(SENSOR

@r
R,~ R,
[iJ-
R~
@@

IGNITION
SWITCH
ON
01"
START
ECM(ECCS
CONTROL BIR
MODULE)

em
-!-

@
Detectable
line
for DTC
Non-detectable line
for
DTC

EC-VSS-01

_.

-:

Refer toEL-POWER.
FUSE
BLOCK
(,JIB)

~
10A

[]]

~

PU/R

I

PU/R/U"Arn
r=:b~

I~I@

PUIR

I

PU/R

13'21
VSP
COMBINATION
METER (SPEED-
OMETER)

@

@)

r---------------------------------~
~---------------------------------~
~~

mz:rnJ
B
~@@

tW
GY
Refer
tolast page
(Foldout page).

CID
L

HEC009
EC-314

•

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

Checkthefollowing.
• Harness connectors

CID,@

• Harness foropen or
short between ECM
and combination meter

If
NG, repair harness or
connectors.

NG

CHECK INPUTSIGNAL CIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector
and combination meterharness con-
nector.
3. Check harness continuity between
ECM terminal
@
and terminal
@.

Continuity shouldexist.

If OK, check harness forshort.

MEC7598
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Vehicle SpeedSensor (VSS)(Cont'd)

@

@I
CONNECTOR
I

32

ECM
OK

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

EC-316

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Start Signal

EC-S/SIG-01

Refer toEL-POWER.

•

-:
Detectable line
for DTC
-: Non-detectable
line forDTC
ECM (ECCS
CONTROL
MODULE)

em

FUSE

BLOCK
(JIB)

~

(E106)

7.5A

1261
IGNITION
ST SWITCH

(E114)

IN.41
BIY

I

BIY

r=:b
(M49)

I!¥JI
CEID

BIY

I

SlY

~ ST

MTR

@15f1l
(E114)

@gN]
w
Refer
tolast page
(Foldout page).

em
L

HEC010
EC-317

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

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Exhaust GasRecirculation (EGR)Valveand
EVAP Canister PurgeControl
SYSTEM DESCRIPTION

I
Camshaft positionsensor
I

Engine speed
EGRvalve

I
Mass
airflow sensor
I

Amount ofintake air ECM

&
EVAP
(ECCS canister

I
~Engine
coolanttemperature control
purgecon-
Engine coolant temperature sensor
module)trolsole-

I
noid
valve
Ignition switch
I

Start signal

I

This system cutsandcontrols vacuumappliedto
EGR valve andEVAP canister tosuit engine oper-
ating conditions. Thiscut-and-control operation
is accomplished throughtheECM andtheEGR
valve
&
EVAP canister purgecontrol solenoid
valve. WhentheECM detects anyofthe following
conditions, currentflowsthrough thesolenoid
valve. Thiscauses theport vacuum tobe dis-
charged intotheatmosphere. TheEGR valve and
EVAP canister remainclosed.
•

•

•
•
•

•
Low
engine coolant temperature
Engine starting
High-speed engineoperation
Engine idling
Excessively highengine coolant temperature
Mass airflow sensor malfunction
•

Exhaust pressure COMPONENT
DESCRIPTION
EGR valve

The EGR valve controls theamount ofexhaust gasrouted tothe
intake manifold. Vacuumisapplied tothe EGR valve in
response tothrottle valveopening. Thevacuum controls the
movement ofataper valve connected tothe vacuum diaphragm
in the EGR valve.

SEF783K EGRC-BPT valve

The EGRC-BPT valvemonitors exhaustpressure toactivate the
diaphragm, controllingthrottlebodyvacuum appliedtothe EGR
valve. Inother words, recirculated exhaustgasiscontrolled in
response topositioning ofthe EGR valve ortoengine operation.

SEF529K
~ Vacuumsignal
SEF240PE EGR
valve
&
EVAP canister purgecontrol solenoid valve

The EGR valve
&
EVAP canister purgecontrol solenoid valve
responds tosignals fromtheECM. When theECM sends anON
(ground) signal,thecoil inthe solenoid valveisenergized. A
plunger willthen move tocut the vacuum signal(fromthethrot-
tle body tothe EGR valve andEVAP canister purgevalve).
When theECM sends anOFF signal, thevacuum signalpasses
through thesolenoid valve.Thesignal thenreaches theEGR
valve andEVAP canister.

EC-319

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

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

EC-EGRC/V-01

ECM (ECCS
CONTROL
MODULE)

em

FUSE
RefertoEL-POWER.
BLOCK
(JIB)



[!j
I
I
'fil
(ffi

3456 W
~
@
B
SR

1[~]1
@

=r=
em

BR

I

BR

1!1~~~p
v~k~iS~EA

PURGE CONTROL
SOLENOID

II 111 VALVE

=r=
I

P

rrfo5u
EGR -:
Detectable line

for DTC

-: Non-detectable
line forDTC
Refer tolast page
(Foldout page).

Cill
L

EC-320
HECD14

•

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