1995 NISSAN ALMERA N15 Service Manual

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

TROUBLEDIAGNOSIS FORDTC34
Knock Sensor (KS)(Cont'd)

EC-KS-01

rn
JOINT
CONNECTOR-6

@

1

ECM
(ECCS
CONTROL
MOOULE)

(IT)

KNK

1
2';
I

W

f .--------.

I I

I I

I I

I I
I I

I I

,,:"
.

w~

w
@Z)

f •

I I
I I

I I

I I
I I
I I

I:: )
-:
Detectable line
for DTC
-: Non-detectable
line forDTC

•

KNOCK
SENSOR

~
~m>
~GY
~@

I.IIIIIIII1lII
GY

em
L

HEC007
EC-307

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

TROUBLEDIAGNOSIS FORDTC43
SEF089K Throttle
Position Sensor

The throttle position sensorresponds tothe accelerator pedal
movement. Thissensor isakind ofpotentiometer whichtrans-
forms thethrottle position intooutput voltage, andemits the
voltage signaltothe ECM. Inaddition, thesensor detects the
opening andclosing speedofthe throttle valveandfeeds the
voltage signaltothe ECM.
Idle position ofthe throttle valveisdetermined
by
the ECM
receiving thesignal fromthethrottle position sensor.Thisone
controls engineoperation suchasfuel cut.

•

SEF520Q

VI

Supplyvoltage:
~ 4.55V (Applied be~VoIee~_terminals NO.1and3)
.~

2

[f~.. ~
L

L
1
&c
~ ~M

Throttle position sensor g
-g

:; ~ 0.5

0.

8 ~
00 -~---_. 90
Throttle valveopening angle(deg.)

Diagnostic Trouble
Code No. Malfunction
isdetected when... Check
Items
(Possible Cause)

43
•
An excessively loworhigh voltage fromthesensor •Harness orconnectors
is sent toECM. (Thesensor circuitisopen orshorted.)
• Throttle position sensor

EC-309

TROUBLEDIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)
OVERALL FUNCTION CHECK

"*
MONITOR *NO FAIL
0

THRTL
pas
SEN 0.48V

I- I~-----..l

~-R-E-CO-R-D-~I

SEF477QUse
thisprocedure tocheck theoverall function ofthe throttle
position sensor.Duringthischeck, aDTC might notbecon-
firmed.

rij\
1)

~ 2)
Turn
ignition switch"ON".
Select "MANU TRIG"and"HISPEED" in"DATA
MONITOR" modewithCONSULT.
3) Select "THRTL POSSEN" in"DATA MONITOR" mode
with CONSULT.
4) Press RECORD onCONSULT SCREENatthe same
time accelerator pedalisdepressed.
5) Print outthe recorded dataandcheck thefollowing:
• The voltage whenaccelerator pedalfullyreleased
is approximately 0.35-0.65V .
• The voltage riseislinear inresponse toaccelera-
tor pedal depression .
• The voltage whenaccelerator pedalfullydepressed
is approximately 4V.

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

1) Turn ignition switch"ON",
2) Check thevoltage between ECMterminals
@J
and
@,
@
(ground) andcheck thefollOWing:
• The voltage whenaccelerator pedalfullyreleased
is approximately 0.35-0.65V.
• The voltage riseislinear inresponse toaccelera-
tor pedal depression.
• The voltage whenaccelerator pedalfullydepressed
is approximately 4V,

THRTL

15:38 ~~~
(V)
00"46 2.88
00"47 3.00
00"48 3.12
00"49 3.24
00"50 3.34
00"51 3.46
00"52 3.56

SEF267Q
OK
data

THRTL
pos
SEN
OO~

~~~'3. 1
'g;v :":'

................. 1

MEC7228
~i)
ECM
El'coNNEcTORII

LelJ
(9"oodl

II
THRTl

15:38 ~~~
(V)

00"36 214
00"37 2.20
00"38 2.26
00"39 2.32
00"41 2.26
00"42 2.20
00"43 2.58

NG
data
THFm.
pos
SEN 00"00

'~U. '3
~v ~:'

•

")
•...•..•..• 1

EC-310

~@

BR
TROUBLE
DIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)

EC-TPS-01

THROTTLE
--
Detectable
line
POSITION for
DTC
SENSOR
-:
Non-detectable

@
line
forDTC

(
1

•

I

I

t
I~

~

I
I

I
I
I

I

I

I

I
I

I

I

I
I
I

I
I

I
JOINT

I
I
CONNECTOR-6

I
I

@

I
I
I I

~~

'::::

.-

t
~

i~.

P/L
Y

B
B

n

13-71 12.01

~
12-91

B
B
B

AVCC TVOGNDGND
ECM

t
J
1

-A
-A
(ECCS
CONTROL
MODULE)

CED
0:13)

m

~@

IIIillIIIIIIl
GY

CED
L

HECOOB

EC-311

Repairharness orcon-
nectors.

NG
CHECK POWER SUPPLY.

1. Turn ignition switch"OFF".
2. Disconnect throttleposition sensor
harness connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
(1)

and ground withCONSULT ortester.

Voltage: Approximately 5V

INSPECTION
START

TROUBLE
DIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)
DIAGNOSTIC PROCEDURE
MEC723B

,,~n~7
r~r~\
n\ \
!Y

-z~lntake manifold

[L~
SEF480QOK
CHECK GROUND CIRCUIT.

1. Turn ignition switch"OFF".
2. Loosen andretighten engineground
screw.
3. Check harness continuity between
terminal
@
and engine ground.

Continuity shouldexist.
If
OK, check harness forshort.

OK
CHECK INPUTSIGNAL CIRCUIT.

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

Continuity shouldexist.

If OK, check harness forshort.

OK

ADJUST THROTTLE POSITIONSEN-

SOR.

Perform "BasicInspection", EC-271.

OK NG

NG
Check
thefollowing.
• Harness foropen or
short between ECM
and throttle position
sensor

If
NG, repair harness or
connectors.
Repair harness orcon-
nectors

~io
~ SEF481Q
CHECK
COMPONENT
(Throttle positionsensor).
Refer to"COMPONENT INSPECTION"
on next page.

OK•

Disconnect andreconnect harnesscon-
nectors inthe circuit. Thenretest.
Trouble isnot fixed.
NG

Replace throttleposition
sensor. Toadjust it,per-
form "Basic Inspection",
EC-271.

~io ~i5

II
ECM
~CONNECTORII
o::fl\])

20
Check
ECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. Reconnect ECMhar-
ness connector andretest.
INSPECTION END

SEF482Q EC-312

•

Approximately
10kQ
Resistance
[at25'C (77'Fl)
Approximately 1kQ
1 -10 kQ

If
NG, replace throttleposition sensor.
To adjust it,perform "BasicInspection", EC-271.

Throttle
valveconditions
Completely closed
Partially open
Completely open
Throttle
position sensor

1. Disconnect throttleposition sensorharness connector.
2. Make surethatresistance betweenterminals
@
and
CID

changes whenopening throttlevalvemanually.

MEC7248
TROUBLE
DIAGNOSIS FORDTC43
Throttle Position Sensor(Cont'd)
COMPONENT INSPECTION
EC-313