1995 NISSAN ALMERA N15 Service Manual

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS~
Power Steering OilPressure Switch

EC-PST/SW-01

PWST
1~31

PU/W

I

PU/W

Irnl
CfID

=r@

PU/W

I

PU/W

I$J'CMID
~
pu/w

I
ECM

(ECCS
CONTROL
MODULE)

em
-:
Detectable line

for DTC

-: Non-detectable

line for
DTC
POWER STEERING
OIL PRESSURE
SWITCH

(g)

ON

OFF .....--
~B

I

,-,

B B

-L -L

@
<1;51)

~@

U@
GY
Refer
tolast page
(Foldout page).

CHID
m

,

em
L

EC-354 HEC018

MEC730B
•

INSPECTION
START

DIAGNOSTIC
PROCEDURE
CHECK OVERALL FUNCTION.
~
INSPECTION
END

I

1. Start engine andwarm itup suffi-
ciently.

00
2.
Perform "PW/STSIGNAL
CIRCUIT" in"FUNCTION
TEST" modewithCONSULT.
OR

@
2.
Check "PW/ST SIGNAL" in
"DATA MONITOR" modewith
CONSULT.

Steering isin neutral
position: OFF
Steering isturned:
ON
OR

@
2.
Check voltage between ECM
terminal
@
and ground.

Voltage:
When steering wheelis
turned quickly.
Approximately OV
Except above
Approximately 8-10V

~NG

+
-
SEF5911
MEF023E
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS[][]
Power Steering OilPressure Switch(Cont'd)
COMPONENT DESCRIPTION

The power steering oilpressure switchisattached tothe power
steering high-pressure tubeanddetects apower steering load.
When apower steering loadisdetected, itsignals theECM. The
ECM adjusts theIACV-AAC valvetoincrease theidle speed and
adjust forthe increased load.

RECORD

NEXT

II
START

•
PW/ST SIGNAL CIRCUIT.
HOLD STEERING WHEEL
IN AFULL

LOCKED
POSITION
THEN
TOUCH START
-crMONITOR -crNOFAIL
0

PW/ST SIGNAL OFF

Hoodledge
RH~

m
1='
=EC=M
=.,~
CONNECTORII ~
is

43
00

[Y]

.".MEF315F
EC-355

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
mJ

Power Steering OilPressure Switch
(Cont'd)

~i5
dIb

~i5

II
ECM
~CONNECTORII

43 AEC760
SEF501Q
@

1

CHECK GROUND CIRCUIT. NG
Repair harness orcon-
1. Turn ignition switch"OFF".
--..

nectors.
2. Disconnect powersteering oilpres-
sure switch harness connector.
3. Check harness continuity between
terminal
@
and engine ground.
Continuity shouldexist.
If OK, check harness forshort.
OK

[!J
CHECK INPUTSIGNAL CIRCUIT. NG
Check thefollowing.
1. Disconnect ECMharness connector.
--..

•Harness connectors
2. Check harness continuity between
CID,@

ECM terminal
@
and terminal
CD.
•
Harness connectors
Continuity shouldexist.
@,@D

If OK, check harness forshort. •
Harness foropen or
OK short
between ECMand
power steering oilpres-
sure switch
If NG, repair harness or
connectors.

Power steering oilpressure switch

1. Disconnect powersteering oilpressure switchharness con-
nector thenstart engine.
2. Check continuity betweenterminals
CD
and
@.

~
to
ID

~
CHECK
COMPONENT
(Power steering oilpressure switch).
Refer to"COMPONENT INSPECTION"
below.

OK

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

COMPONENT INSPECTION

Conditions
Steering wheelisbeing turned
Steering wheelisnot being turned NG
Replace powersteering
oil pressure switch.
Continuity
Yes
No
AEC762
IfNG, replace powersteering oilpressure switch.

EC-356

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS~
Park/Neutral PositionSwitch

EC-PNP/SW-01

•

A/T
models
MlT models
Detectable line
for DTC
Non-detectable line forDTC

(A):

@:

-:
-:

• INHIBITOR

P ..... ..
1SWITCH

R N-D 2
(W):(A)

ECM
(ECCS
CONTROL
MODULE)

ill)

NEUTRAL
POSITION
SWITCH

@ID:
@

NEUT

1
3•5
1

G/OR

I

G/OR

I$I@
@

G/OR

1$1
CMID

~

G/OR

I ~~

O---a>---
G/OR.j
Qr
G/OR --

t

G/OR

IdJl~

=r
(£201)

G/OR

I

G/OR

m

OTHER --

~~

tIDIDZIID
GY
fITilll~

~ B
Refer
tolast page
(Foldout page).

(][) (E10t)

,

~ (E220)

tgJ
B
~
«222)
~ GY

(IT)
L

HEC019
EC-357

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

Park/Neutral PositionSwitch(Cont'd)

When thegear position isin "P" (A/T models only)or"N",
park/neutral positionis"ON". ECMdetects theposition
because thecontinuity ofthe line (the "ON" signal) exists.

INSPECTION END
OK
NG
INSPECTION
8TART
DIAGNOSTIC
PROCEDURE

Neutral position switch
(M/T
mod-
els)

CHECK OVERALL FUNCTION.

1 Turn ignition switch"ON".

(Iii'"
2.Perform "PARK/NEUT POSI
~ SWCKT" in"FUNCTION
TEST" modewithCONSULT.

OR

(F.i\
2.Select "PINPOSI SW"in

\J!J
"DATAMONITOR" modewith
CONSULT.
3. Check "PINPOSI SW"signal
under thefollowing conditions.

Neutral position: ON
Except neulral posllion: OFF

SEF963N OR
~ 2.Check vo~ge between ECM
~ terminal~and ground under
the following conditions.

Voltage: Neutral position
Approximately OV
Excepl neutral position
Ballery voltage

m

•PARKINEUT POSISWCKT •
SHIFT
OUT OF
NIP
-POSITION
THEN
TOUCH START

I
NEXT
II
START

I

MEC731B

m
*MONITOR *NO FAIL
0

PIN POSI SW ON
RECORD

m ~
CONNECT~~
lAID£)~~

II
ECM
EcoNNECTORl1

35

MEC779B
EC-3S8

•

CHECK
GROUND CIRCUIT.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
--..

•Harness connectors
2. Disconnect neutralposition switch
(ill1),

(ill)

harness connector. •Harness foropen or
3. Check harness continuity between shortbetween neutral
terminal @and body ground.
positionswitchand

Continuity shouldexist.
bodyground
If OK, check harness forshort. IfNG, repair harness or
OK connectors.

[!]
.

CHECK INPUTSIGNAL CIRCUIT.
NG
Check thefollowing.
1. Disconnect ECMharness connector.
f-----

•Harness connectors
2. Check harness continuity between
@,@

ECM terminal
@
and terminal
CD.
•
Harness connectors

Continuity shouldexist.
@,@D

If OK, check harness forshort. •Harness connectors
OK
@),@

• Harness foropen or
short between ECMand
neutral position switch
If NG, repair harness or
connectors.
CHECK COMPONENT NG
Replace neutralposition
(Neutral positionswitch).
~

switch.
Refer toMT section.
OK

AEC750
SEF503Q
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Park/Neutral PositionSwitch(Cont'd)

@

1

~Io ~Io

II
ECM
Ef
CONNECTOR
II
illDJ

35

Disconnectandreconnect 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-359

INSPECTIONEND
INSPECTION
START
CHECK OVERALL FUNCTION. OK

fiii\
1.Turn ignition switch"ON".
~ 2.Perform "PARK/NEUT POSI
SW CKT" in"FUNCTION
TEST" modewithCONSULT.
OR

rif1
1.Turn ignition switch"ON".
~ 2.Select "PINPOSI SW"in
"DATA MONITOR" modewith
CONSULT.
3. Check "PINPOSI SW"signal
under thefollowing conditions.

"N"
or
"P"
position: ON
Except aboveposition: OFF
OR
1. Make surethatinhibitor switch
circuit functions properly.
(Refer toAT section.)
2. Turn ignition switch"ON".
3. Check voltage between ECM
terminal @and ground under
the following conditions.
Voltage: UN" or
uP"
position
Approximately OV
Except aboveposition
Battery voltage
SEF963N
MEC7798
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Park/Neutral PositionSwitch(Cont'd)

I
Inhibitor
switch(AIrmodels)
J

m

•PARKINEUT POSISWCKT •
SHIFT
OUT OFNIP-POSITION
THEN
TOUCH START

I
NEXT
II
START

I

MEC7318

m
*MONITOR *NO FAIL
0

PIN POSI SW ON
RECORD

m~i)~0
II
ECM
~CONNECTORII

30

NG
EC-360

•

CHECK
GROUND CIRCUIT.
NG
Check thefollowing.
1. Disconnect inhibitorswitchharness
f----+

•Harness connectors
connector.
@ill,@

2. Check harness continuity between •
Harness foropen or
terminals
CD
and body ground. short
between inhibitor

Continuity shouldexist.
switchandbody ground
If OK, check harness forshort. If
NG, repair harness or
OK connectors.

[i
CHECK INPUTSIGNAL CIRCUIT.
NG
Check thefollowing.
1. Disconnect ECMharness connector.
----.

•Harness connectors
2. Gheck harness continuity between
QD,@

ECM terminal
@
and terminal
@.
•Harness connectors

Continuity shouldexist.
@,@[!)

If OK, check harness forshort. •Harness connectors
OK
@,@

• Harness foropen or
short between ECMand
inhibitor switch
If NG, repair harness or
connectors.

MEC780B
MEF791EA
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Park/Neutral PositionSwitch(Cont'd)
@

1

~i5
@B

ECM
~CONNECTORI

35
~.

\:lliJ
CHECK
COMPONENT
(Inhibitor switch).
Refer to
AT
section.

OK NG

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

MEC781B
CheckECMpinterminals fordamage
and check theconnection ofECM har-
ness connector. ReconnectECMhar-
ness connector andretest.
INSPECTION END

EC-361