1995 NISSAN ALMERA N15 Service Manual

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

EC-CMPS-01

Refer' toEL-POWER. _.
Detectable line
for' DTC
-: Non-detectab Ie
line for'DTC

t

...

B B B

1..1 J

m m

ECM
(ECCS
CONTROL
MODULE)

em

DISTRIBUTOR
(CAMSHAFT
POSITION
SENSOR)

ern>
"'
J.

...

---

u,,;J~1!.i=ll

L B!W B
JOINTCONNECTOR-6

@

l'" --- ....
~==~-- •

"

B!W
B!W

Ii3'n1
1:0
I
POS POS

rT

L L

12~1 13.01

REF REF
W!L

I

W!L
Ifii'ii\

r=b\!JQ!,

I~I (MB)

W!L

,rID'@

=r='@

W!L

I

T-,

W!L W!L

I!~I
ECCS
~ RELAY

!bi=UI!.i=U
CEID
WIG W!R

I

.
--_.

I

"

WIG
W!R W!R

rhU3'sn~

SSOFF VBVB

(Ill
I
I~
@
~5
1
CF
L3)

3456 W
T
~
rn>
~@

(11213415\6)
GY
ITIIIIIIIillI
GY
Refer
tolast page
(Foldout page).

em
L

HEC003
EC-290

•

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

TROUBLEDIAGNOSIS FORDTC12 [][]
Mass AirFlow Sensor (MAFS) (Coni'd)

EC-MAFS-01

Refer toEL-POWER.
-:Oetectable line
for DTG
-: Non-detectable
line forDTC

11

B B B

t...J
1


(ffi)

ECM
(EGCS
CONTROL
MODULE)

em

OR
W

w=IT5il~
QA+ QA-
"

... 1

JOINT
CONNEGTOR-6

@

( ....-m=_
~=P:1

W!R

W
3 MASS

AIR

FLOW
SENSOR

lbjdJlbj:Jlm OR W

t

W!L

I

W!L
iETtITI

1Fst11~
~@

W/L

,ctJ,@

=r(ffi
W!L

I

T-,

W!L W!L

I!~I
EGGS
~ RELAY

1ki=JI1'=i=!'@
WIG W!R

I

.--_
....

I

"

WIG
W!RW!R

wtilli1Bnd7n

SSOFF VBVB
~II
I'fil
em

3456 W
~

cn.g:oo
BR
~@

CDODDDJDJJJD
GY
Refer
tolast page
(Foldout page).

em
L

HEC004
EC-294

•

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

TROUBLEDIAGNOSIS FOROTC13

20
19
6

9
4

~ 2

~ 1.0

1ij
0.8

'w

8!
04

0.2

0.1
.20 020 40 6080100
(-4) (32) (68)(104)(140)(176)(212)
Temperature 'C
(OF)
SEF594K
SEF012P Engine
Coolant Temperature Sensor(ECTS)

The engine coolant temperature sensorisused todetect the
engine coolant temperature. Thesensor modifies avoltage sig-
nal from theECM. Themodified signalreturns tothe ECM as
the engine coolant temperature input.Thesensor usesather-
mistor whichissensitive tothe change intemperature. The
electrical resistance ofthe thermistor decreases astempera-
ture increases.

<
Reference data>

Engine coolant temper-
Voltage Resistance
ature

.
(V)(kQ)
'C ("F)
-10 (14) 4.4
7.0-11.4
20 (68) 3.5
2.1-2.9
50 (122) 2.20.68-1.00
90 (194) 0.9
0.236-0.260
•

Diagnostic
Trouble Code
No. Malfunction
isdetected when... Check
Items
(Possible Cause)
13 •
An excessively highorlow voltage fromthesensor •Harness orconnectors
is sent toECM. (Thesensor circuitisopen orshorted.)
• Engine coolant temperature sensor
DIAGNOSTIC TROUBLECODECONFIRMATION
PROCEDURE

rF.i\
1)Turn ignition switch"ON".
~ 2)Select "DATA MONITOR" modewithCONSULT.
3) Wait atleast 5seconds.

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

rm
1)Turn ignition switch"ON"andwait atleast 5seconds.
~ 2)Turn ignition switch"OFF", waitatleast 7seconds
and then turn"ON".
3) Perform "Diagnostic TestMode II"(Self-diagnostic
results) withECM.

EC-297