1995 NISSAN ALMERA N15 Service Manual

TROUBLEDIAGNOSIS FORDTC13 ~
Engine Coolant Temperature Sensor(ECTS)
(Cont'd)

EC-ECTS-01

~ENGlNE COOLANT

TEMPERATURE
SENSOR

@lID

Il:j.JJ
4=U

BR/Y B

I I

BR/Y ~ B

$--1--$

BR/Y
U])
B _.
Detectable line
for DTC
-: Non-detectable
line forDTC

~~

@
L
~

~ GY
•

t

BR/Y
B
B

Ii1'sH
~
12-91

TW GND
GND
ECM
-A -A
(ECCS
CONTROL
MODULE)

em
em
L

EC-298 HEC005

•

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

TROUBLEDIAGNOSIS FORDTC21
Ignition Signal
(Cont'd)

EC-IGN/SG-01

G

m
30A

OJ
Refer
toEL-POWER.
-:Detectable line
for OTC
-: Non-detectable
line forDTC

n

BIY BB

t.J
!

m m

DISTRIBUTOR

m

@

~~
W/B B/W

t
I'
ToEC"

.- BIY
+
(EGGS contra 1

~ module)

CONDENSER
POWER TRANSISTOR

~
G

I'

G

W
RESISTOR

~

2

GY/R W/B

m m

IGN IGN

CK
ECM
(EGCS
CONTROL
MODULE)

L- ---l
CED

IGNITION
COIL

BIR

w+fl

t

SPARK PLUG
ST
IGNITION
SWITCH


'

....

ACG

~
BIR

db~

I~ICMID

BIR

IUJI@

=r
BIR

OFF

~ (E114)

tmIID
W
fill

I
lfi]
Cffi

3456 W
r--------------------~

I I
I I

I
I:XI
m~@1

: (11213141516)
GY
CZIID
GY:

I I

L
~
Refer
tolast page
(Foldout page).

(IT)
L

HEC006
EC-302

•

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

•

Approximately
25kQ
Resistance
[at25'C (77'F)]

0.5 -1.0Q

Terminal

(J) -@
(Primary coil)

(J) -
@
(Secondary coil)

For checking secondary coil,remove distributor capand
measure resistance betweencoiltower metaltip
@
and
terminal
(f).

If NG, replace distributor assemblyasaunit.

Ignition
coil

1. Disconnect ignitioncoilharness connector.
2. Check resistance asshown inthe figure.

AEC902
MEC719B
TROUBLE
DIAGNOSIS FORDTC21
Ignition Signal(Cont'd)
COMPONENT INSPECTION

LCoiltower meta/tip

Powertransistor

1. Disconnect camshaftpositionsensor
&
power transistor
harness connector andignition coilharness connector.
2. Check power transistor resistance betweenterminals
CID

and
@.

Terminals Resistance
Result
NotOQ
OK

@
and
@

on
NG

If NG, replace distributor assembly.

Resistor
1. Disconnect resistorharness connector.
2. Check resistance betweenterminals
CD
and
CID

Resistance:
Approximately
2.2kQ
[at
25°C (77°F»
If NG, replace resistor.

EC-305