1995 NISSAN ALMERA N15 check engine

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

•

Check
thefollowing.
• Harness foropen or
short between ECM
and engine coolant
temperature sensor
• Harness connectors

@D,@)

If NG, repair harness or
connectors.
Replace enginecoolant
temperature sensor.
Check
thefollowing.
• Harness foropen or
short between ECM
and engine coolant
temperature sensor
• Harness connectors

@D.@)

If NG. repair harness or
connectors.

NG
NG
OK

CHECK COMPONENT
(Engine coolanttemperature sensor).
Refer to"COMPONENT INSPECTION"
on next page.

CHECK
GROUND CIRCUIT.

1. Turn ignition switch"OFF".
2. Check harness continuity between
terminal
CD
and engine ground.

Continuity shouldexist.

If OK, check harness forshort.
INSPECTION
START

OK

m

CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect enginecoolant tempera-
ture sensor harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
@

and ground withCONSULT ortester.

Voltage: . Approximately 5V
SEF518Q
SEF519Q
MEC7188A
TROUBLE
DIAGNOSIS FORDTC13
mJ

Engine Coolant Temperature Sensor(ECTS)
(Cont'd)
DIAGNOSTIC PROCEDURE

~i5
~

~io

~

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

EC-299

TROUBLEDIAGNOSIS FORDTC13 ~
Engine Coolant Temperature Sensor(ECTS)
(Cont'd)
COMPONENT INSPECTION
SEF152P Engine
coolant temperature sensor

Check resistance asshown inthe figure.

Temperature °C
(OF)

20 (68)
50 (122)
90 (194)
Resistance
kQ

2.1 -2.9
0.68 -1.00
0.236 -0.260

If NG, replace enginecoolant temperature sensor.

EC-300

TROUBLEDIAGNOSIS FORDTC21
Ignition Signal
COMPONENT DESCRIPTION
Ignition coil
&
power transistor (Builtintodistributor)

The ignition coilisasmall molded type.Theignition signalfrom
the ECM issent tothe power transistor. Thepower transistor
switches onand offthe ignition coilprimary circuit.Asthe pri-
mary circuit isturned onand off,the proper highvoltage is
induced inthe coil secondary circuit.

Diagnostic Trouble
Code No.

21
Malfunction
isdetected when...
• The ignition signalinthe primary circuitisnot sent
to ECM during engine cranking orrunning. Check
Items
(Possible Cause)
• Harness orconnectors
(The ignition primary circuitisopen orshorted.)
• Power transistor unit.
• Resistor
• Camshaft positionsensor
• Camshaft positionsensorcircuit
•

DIAGNOSTIC TROUBLECODECONFIRMATION
PROCEDURE
Note: Ifboth DTC11and 21are displayed, performTROUBLE
DIAGNOSIS FORDTC11first. Refer toEC-289.

(F.I\ 1)Turn ignition switch"ON".
~ 2)Select "DATA MONITOR" modewithCONSULT.
3) Start engine. (Ifengine doesnotrun, turn ignition
switch to"START" foratleast 5seconds.)

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

~ 1)Turn ignition switch"ON".
~ 2)Start engine. (Ifengine doesnotrun, turn ignition
switch to"START" foratleast 5seconds.)
3) Turn ignition switch"OFF", waitatleast 7seconds
and then turn"ON".
4) Perform "Diagnostic TestMode II"(Self-diagnostic
results) withECM.

EC-301

•

Check
thefollowing.
• Harness connectors

QD,@

• Harness connectors

@,@D

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

Yes

NG

INSPECTION
START

OK

Turn
ignition switch"OFF". andrestart
engine.

Is engine running?
CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect ignitioncoilharness con-
nector.
3. Turn ignition switch"ON".
4. Check voltage between terminal

(J)
and ground withCONSULT or
tester.

Voltage: Batteryvoltage
SEF010P
TROUBLE
DIAGNOSIS FORDTe21
Ignition Signal(Cont'd)
DIAGNOSTIC PROCEDURE
CHECK GROUND CIRCUIT.
AEC69a
1.Turn ignition switch"OFF".
2. Disconnect powertransistor harness
connector.
3. Check harness continuity between
terminal
@
and engine ground.

Continuity shouldexist.
If
OK. check harness forshort.

~i5

@a

~ SEF4690

~iv
~i5

II
ECM
'gCONNECTORII
(1!2IffllsI6) CHECK
INPUTSIGNAL CIRCUIT.

1. Disconnect ECMharness connector.
2. Check harness continuity between
ECM terminal
G)
and power transis-
tor terminal
G).
Continuity shouldexist.

If OK. check harness forshort.

OK

CHECK COMPONENTS
(Ignition coil,power transistor).
Refer to"COMPONENT INSPECTION".

EC-305. NG
NG
NG
Repair
harness orcon-
nectors.
Repair harness orcon-
nectors.
Replace malfunctioning
component(s).

OK
SEF4700
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-303

Repairharness orcon-
nectors.
Replace resistor.

NG
NG

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

CHECK
INPUTSIGNAL CIRCUIT.

1. Stop engine.
2. Disconnect ignitioncoilharness con-
nector.
3. Strip tapecovering resistor.
4. Disconnect ECMharness connector.
5. Check harness continuity between
ignition coilterminal
CID
and resistor
terminal
(!).
resistor terminal
@

and ECM terminal
@.

Continuity shouldexist.

If OK, check harness forshort.

OK
TROUBLE
DIAGNOSIS FORDTC21
Ignition Signal(Cont'd)

@

SEF471Q
(;J~i5
~i5

1
~~Q~
'Cf~OONNlliOR~

LllJ
~i5

cffu

[ill

Disconnectandreconnect 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-304

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

Repairharness orcon-
nectors.
Repair harness orcon-
nectors.
Replace knocksensor.

NG

~

INSPECTION
START
Loosen andretighten engineground
screws.

OK

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.

OK

CHECK COMPONENT
(Knock sensor).
Refer to"COMPONENT INSPECTION"
below.
Troubleisnot fixed.
Check ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest,
OK

m
CHECK SUB.HARNESS CIRCUIT.

1. Disconnect knocksensor harness
connector.
2. Check harness continuity between
knock sensor harness connector ter-
minal
@
and knock sensor sub-har-
ness connector terminal
CD.

Continuity shouldexist.

If
OK, check harness forshorl.

fa
CHECK INPUTSIGNAL CIRCUIT.

1. Turn ignition switch"OFF".
2. Disconnect ECMharness connector
and knock sensor harness connector.
3. Disconnect sub-harness connectors

@,@D.

4. Check harness continuity between
terminal
CD
and ECM terminal
@.

Continuity shouldexist.
If OK, check harness forshorl.

MEC757B
MEC7568
TROUBLE
DIAGNOSIS FORDTC34

Knock Sensor (KS)(Cont'd)

DIAGNOSTIC PROCEDURE
~15
..
~
\ili:tV
~~

\tiiliJ

~15

ECM
BCONNECTORII

27
,,~n~(

r\r~\//\ \
AY

..("'~Inlake manifold

~

\
fa

II

INSPECTIONEND

COMPONENT INSPECTION

Knock sensor
• Use anohmmeter whichcanmeasure morethan10MO.
1. Disconnect knocksensor harness connector.
2. Check resistance betweenterminal
@
and ground.
Resistance: 500-620 kO[at25°C (77°F))

CAUTION:
Do not use any knock sensors thathave been dropped orphys-
ically damaged. Useonly newones.

AEC719
EC-308