1995 NISSAN ALMERA N15 check engine

TROUBLEDIAGNOSIS FORPOWER SUPPLY
[]K]

Main Power Supply andGround Circuit(Cont'd)

II Il

~i)
ECM
Er
CONNECTOR
II

36

~i)
ECM
EfCONNECTORI!

~$

Lwt
INSPECTION
START
Start engine.

Is engine running?

Yes

MEC746B
No

--+
CHECK
POWER SUP-
PL V-I.
1. Turn ignition switch

"ON".

2. Check voltage between
ECM terminal @and
ground withCONSULT
or tester.

Voltage: Batteryvolt-
age

If NG, check thefollow-
ing .
• Harness connectors

@,@

• Harness connectors

OO,@l)

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

MEC714B
~OK
Go to
III
"CHECK
GROUND CIRCUIT" on
next page.
Check thefollowing.
• Harness connectors

@,@

• Harness connectors

OO,@l)

• 7.5A fuse
• Harness foropen or
short between ECM
and battery
If NG, repair harness or
connectors.
Case-1: Batteryvoltage
does notexist.
Case-2: Batteryvoltage
exists formore than
a few seconds.
OK

--+
Goto
III
"CHECK
GROUND CIRCUIT" on
next page.
NG

--+

CHECK POWER SUPPLV-III.
1. Turn ignition switch"ON"andthen

"OFF".

2. Check voltage between ECMterminals

@,
@
and ground withCONSULT
or tester.

Voltage:
After turning ignition switch"OFF",
battery voltage willexist forafew
seconds, thendrop toapproximately

QV.

CHECK
POWER SUPPLV.II.
1. Stop engine.
2. Check voltage between ECMterminals

@l ,
(ill)
andground withCONSULT
or tester.

Voltage: Batteryvoltage

MEC747BI OK
MEC748B

~
CONNECTOR
II

38' 47

"--.--'

ECM

Il

@
NG
Case-2
Case-1 Go
to
[it
"CHECK ECCS
RELA Y"onnext page.
EC-287

TROUBLEDIAGNOSIS FORPOWER SUPPLY
[gJ

Main Power Supply andGround Circuit(Cont'd)

@

~IV ~i5

Ie
ECM E!'CONNECTORI! +351

38.47

~
SEF460Q

ts
3 2
1

5
I!]

CHECK HARNESS CONTINUITY
BETWEEN ECCSRELAY ANDECM

1. Disconnect ECMharness connector.
2. Disconnect ECCSrelayharness con-
nector.
3. Check harness continuity between
ECM terminals
@,@
and terminal

@.
Continuity shouldexist.

If OK, check harness forshort.

OK
CHECK VOLTAGE BETWEEN ECCS
RELAY ANDGROUND.

Check voltage between terminals
(!),

@
and ground withCONSULT or
tester.
Voltage: Batteryvoltage NG
NG
Repair
harness orcon-
nectors.
Check thefollowing.
• Harness connectors

@,@

• Harness connectors

@,

• Harness foropen or
short between ECCS
relay andbattery
If NG, repair harness or
connectors.
Repair harness orcon-
nectors.
Replace ECCSrelay.

NG

NG
OK
OK

[!1

CHECK ECCSRELAY.

1. Apply 12Vdirect current between
relay terminals
(!)
and
@.

2. Check continuity betweenrelayter-
minals
@
and
@.

12V
«(!) .
@) applied:
Continuity exists.
No voltage applied:
No continuity

Ii

CHECK OUTPUT SIGNALCIRCUIT.

Check harness continuity betweenECM
terminal
@
and terminal
@.
Continuity shouldexist.

If OK, check harness forshort.

AEC684
AEC492

~i5

•

JO[CONNECTOR

II

4

ECM

Ii

OK

III

CHECK GROUND CIRCUIT.

1. Turn ignition switch"OFF".
2. Loosen andretighten engineground
screws.
3. Disconnect ECMharness connector.
4. Check harness continulty between
ECM terminals
@,
@,@,
@,

@,
COO,GID
andengine ground.

Continuity shouldexist. .

If OK, check harness forshort.
NG

Repair harness orcon-
nectors.

SEF090M OK

III

~15@a

II
ECM ~CONNECTOR
II

6'13'39048'107'108'116

.
.

LEn
Check
ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector.
INSPECTION END

SEF461Q EC-288

TROUBLEDIAGNOSIS FOROTC11

Rotor plate

SEF6138

180
0
signal slitfor NO.1 cylinder

\\\\""I"~'11111
1
0
signal slit

\\\\\ d'"
/11;
:£

';\'0\
I//..;:

#'
/%

$ ~
180
0
signal slit

f
0
%

o
Camshaft
PositionSensor(CMPS)

The camshaft positionsensorisabasic component ofthe
ECCS. Itmonitors enginespeedandpiston position. These
input signals tothe ECM areused tocontrol fuelinjection, igni-
tion timing andother functions.
The camshaft positionsensorhasarotor plate andawave-
forming circuit.Therotor plate has360slits fora
1"
(POS) sig-
nal and 4slits fora180
0
(REF) signal. Thewave-forming circuit
consists ofLight Emitting Diodes(LED)andphoto diodes.
The rotor plate ispositioned betweentheLED andthephoto
diode. TheLED transmits lighttothe photo diode. Asthe rotor
plate turns, theslits cutthe light togenerate rough-shaped •
pulses. Thesepulses areconverted intoon-off signals bythe
wave-forming circuitandsent tothe ECM.

Rotor plate

SEF8638

Diagnostic
Trouble Code

No.

11
Malfunction
isdetected when....
• Either 1
0
or 180
0
signal isnot sent toECM forthe
first fewseconds duringengine cranking.
• Either
r
or 180" signal isnot sent toECM often
enough whiletheengine speedishigher thanthe
specified enginespeed.
~
• The relation between rand180
0
signal isnot in
the normal rangeduring thespecified engine
speed. Check
Items
(Possible Cause)
• Harness orconnectors
(The camshaft positionsensorcircuitisopen or
shorted.)
• Camshaft positionsensor
• Starter motor(Refer toEL section.)
• Starting systemcircuit(RefertoEL section.)
• Dead (Weak) battery

3)

@

1)
2)
DIAGNOSTIC
TROUBLECODECONFIRMATION
PROCEDURE

rif\
1)Turn ignition switch"ON"andselect "DATA
~ MONITOR" modewithCONSULT.
2) Start engine andrunitfor atleast 2seconds atidle
speed.

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

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

EC-289

•

NG
Check thefollowing.
• Harness foropen or
short between camshaft
position sensorand
ECCS relay
If NG, repair harness or
connectors.
NG Repair harness orcon-
nector.
INSPECTION
START

CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect camshaftpositionsensor
harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground withCONSULT ortester.

Voltage: Batteryvoltage
CHECK GROUND CIRCUIT.

1.
Turn ignition switch"OFF".
2. Loosen andretighten engineground
screws.
3. Check harness continuity between

SEF524Q
terminal
@
and engine ground.

Continuity shouldexist.

If OK, check harness forshort.

TROUBLE
DIAGNOSIS FOROTC11 [][]
Camshaft PositionSensor(CMPS) (Cont'd)
DIAGNOSTIC PROCEDURE(DETECTABLE CIRCUIT)

~i5
@a

( 1121\'ij151~

SEF463Q
[!J

~15 ~15

II
ECM

ECONNECTORII
mmJili)
31.40

f
~Q~ ~

'-.,-J
.---
[fiJ

..
-
SEF462Q CHECK
INPUTSIGNAL CIRCUIT.

1. Disconnect ECMharness connector.
2. Check harness continuity between
terminal
@
and ECM terminals
@,

@l,
terminal
@
and ECM terminals

@,@.

Continuity shouldexist.

If OK, check harness forshort.

OK

CHECK COMPONENT
(Camshaft positionsensor).
Refer to"COMPONENT INSPECTION"
on next page.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest. NG
Repair harness orcon-
nectors.
NG Replace camshaft position
sensor.
Trouble isnot fixed.
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

EC-291

TROUBLEDIAGNOSIS FORDTC11 [][]
Camshaft PositionSensor(CMPS) (Cont'd)
COMPONENT INSPECTION
Camshaft positionsensor

1. Start engine.
2. Check voltage between camshaft positionsensorterminals

CID,
@
and ground withACrange.

~i)ID

dID

Condition
Engine running atidle Terminal
@and ground
@and ground Voltage
(ACrange)
Approximately
2.7V'

AEC689
SEF887K *:

Average voltageforpulse signal (Actual pulsesignal canbeconfirmed
by oscilloscope.)
3. IfNG, replace distributor assemblywithcamshaft position
sensor.
4. Remove distributor cap.Visually checksignal platefordam-
age ordust.

After thisinspection, diagnostictroublecodeNo.11might be
displayed withcamshaft positionsensorfunctioning properly.
Erase thestored memory.
EC.292

TROUBLEDIAGNOSIS FOROTe12

•

Check
Items
(Possible Cause)

Mass
AirFlow Sensor (MAFS)

The mass airflow sensor isplaced inthe stream ofintake air.
It measures theintake flowratebymeasuring apart ofthe
entire intake flow.Itconsists ofahot wire thatissupplied with
electric currentfromtheECM. Thetemperature ofthe hotwire
is controlled bythe ECM acertain amount. Theheat generated
by the hotwire isreduced asthe intake airflows around it.The
more air,thegreater theheat loss.
Therefore, theECM mustsupply moreelectric currenttomain-
tain thetemperature ofthe hotwire asair flow increases. The

SEF781K
ECMdetects theairflow bymeans ofthis current change.

Malfunction isdetected when...
Diagnostic
Trouble
Code No.

12
•An excessively highorlow voltage fromthesensor •Harness orconnectors
is sent toECM. (Thesensor circuitisopen orshorted.)
• Mass airflow sensor

DIAGNOSTIC TROUBLECODECONFIRMATION
PROCEDURE

fiii\
1)Turn ignition switch"ON",andwait atleast 6sec-
~ onds.
2) Select "DATA MONITOR" modewithCONSULT.
3) Start engine andwait atleast 3seconds.

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

rR\
1)Turn ignition switch"ON",andwait atleast 6sec-
~ onds.
2) Start engine andwait atleast 3seconds.
3) Turn ignition switch"OFF", waitatleast 7seconds
and then turn"ON".
4) Perform "Diagnostic TestMode II"(Self-diagnostic
results) withECM.

EC-293

•

Repair
harness orcon-
nectors.
Repair harness orcon-
nectors.
Repair harness orcon-
nectors.
Replace massairflow
sensor.

NG
NG NG
NG

INSPECTION
START

CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect massairflow sensor har-
ness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground withCONSULT ortester.

Voltage: Batterypositive voltage
CHECK INPUTSIGNAL CIRCUIT.

Check harness continuity betweenter-
minal
CD
and ECM terminal
@.
Continuity shouldexist.

if OK, check harness forshort.

CHECK
GROUND CIRCUIT.

1. Turn ignition switch"OFF"
2. Disconnect ECMharness connector.
3. Loosen andretighten engineground
screws.
4. Check harness continuity between
terminal @and ECM terminal
@.

Continuity shouldexist.

If OK. check harness forshort.

OK

CHECK
COMPONENT
(Mass airflow sensor).
Refer to"COMPONENT iNSPECTION"
on next page.

TROUBLE
DIAGNOSIS FOROTC12
Mass AirFlow Sensor (MAFS) (Cont'd)
DIAGNOSTIC PROCEDURE

~i5~0
c:u:ffiD

MEC749B

~I() ~Io

1='
=E=CM=B CONNECTOR
II
CIIfJ1D

17

Disconnectandreconnect harnesscon-
nectors inthe circuits. Thenretest.

MEC751B
Trouble
isnot fixed.

~i()

II
ECM 'ECONNECTORII

16
~io

(TIffiJ::J
Check
ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

MEC752B EC-295

VoltageV
Less than1.0

1.3 -1.7

Conditions
Ignition switch"ON"(Engine stopped.)
Idle (Engine iswarmed-up sufficiently.)

4,
IfNG,
remove massairflow sensor fromairduct. Check hot
wire fordamage ordust.

Mass
airflow sensor

1, Turn ignition switch"ON",
2, Start engine andwarm itup sufficiently,
3, Check voltage between terminal
CD
and ground,

MEC753B
TROUBLE
DIAGNOSIS FORDTC12

,

Mass AirFlow Sensor (MAFS) (Cont'd)
COMPONENT INSPECTION
SEF881K
EC-296