1995 NISSAN ALMERA N15 relay

HOWTOPERFORM EFFICIENT DIAGNOSIS FORANELECTRICAL INCIDENT
Circuit Inspection (Cont'd)
Voltage checkmethod

1. Remove theblown fuseanddisconnect allloads (i.e.SW1 open, relaydisconnected andsolenoid •
disconnected) poweredthroughthefuse.
2. Turn theignition keytothe ONorSTART position. Verifybattery voltage atthe B
+
side ofthe fuse
terminal (oneleadonthe B
+
terminal sideofthe fuse block andone lead onaknown goodground).
3. With SW1 open andtheDMM leads across bothfuseterminals, checkforvoltage.
voltage; shortisbetween fuseblock andSW1 (point A).
no voltage; shortisfurther downthecircuit thanSW1.
4. With SW1 closed, relayandsolenoid disconnected andtheDMM leadsacross bothfuseterminals,
check forvoltage.
voltage; shortisbetween SW1andtherelay (point B).
no voltage; shortisfurther downthecircuit thantherelay.
5. With SW1 closed, relaycontacts jumpedwithfused jumper wirecheck forvoltage.
voltage; shortisdown thecircuit ofthe relay orbetween therelay andthedisconnected sole-
noid (point C).
no voltage; retracestepsandcheck power tofuse block.

GROUND INSPECTION

Ground connections arevery important tothe proper operation ofelectrical andelectronic circuits.
Ground connections areoften exposed tomoisture, dirtand other corrosive elements. Thecorrosion
(rust) canbecome anunwanted resistance. Thisunwanted resistance canchange theway acircuit
works. Electronically controlledcircuitsarevery sensitive toproper grounding. Aloose orcorroded groundcan
drastically affectanelectronically controlledcircuit.Apoor orcorroded groundcaneasily affectthecir-
cuit. Even when theground connection looksclean, therecanbeathin film ofrust onthe surface.
When inspecting aground connection followtheserules:
1. Remove theground boltscrew orclip.
2. Inspect allmating surfaces fortarnish, dirt,rust, etc.
3. Clean asrequired toassure goodcontact.
4. Reinstall boltorscrew securely.
5. Inspect for"add-on" accessories whichmaybeinterfering withtheground circuit.
6. Ifseveral wiresarecrimped intoone ground eyeletterminal, checkforproper crimps. Makesure
all ofthe wires areclean, securely fastened andproviding agood ground path.Ifmultiple wiresare
cased inone eyelet makesurenoground wireshaveexcess wireinsulation.

Ground Inspection

•
Removeboll(screw).
•

GI-25
Inspect
matingsurfaces
for tarnish. dirt.rust. etc.
Clean asrequired to
assure goodcontact.
•

Reinstallbolt(screw)
securely.

SGI853

HOWTOFOLLOW FLOWCHART INTROUBLE DIAGNOSES
NOTICE

The flow chart indicates workprocedures requiredtodiagnose
problems effectively. Observethefollowing instructions before
diagnosing.
1) Use theflow chart afterlocating probable causesofaprob-
lem following the"Preliminary Check",the"Symptom
Chart" orthe "Work Flow".
2) After repairs, re-check thattheproblem hasbeen com-
pletely eliminated.
3) Refer toComponent PartsandHarness Connector Location
for the Systems described ineach section foridentificationl
location ofcomponents andharness connectors.
4) Refer tothe Circuit Diagram forQuick Pinpoint Check.
If you must check circuit continuity betweenharnesscon-
nectors inmore detail, suchaswhen asub-harness isused,
refer toWiring Diagram ineach individual sectionandHar-
ness Layout inEL section foridentification ofharness con-
nectors.
5) When checking circuitcontinuity, ignitionswitchshould be

"OFF" .

6) Before checking voltageatconnectors, checkbattery volt-
age.
7) After accomplishing theDiagnostic Procedures andElectri-
cal Components Inspection,makesurethatallharness con-
nectors arereconnected asthey were.
•

Example
m ..
-=-=~-----------~

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SGI561
~

OISCONNECT

18
SGI562
INSPECTION
START
CHECK POWER SUPPLY.
1) Turn ignition switch"ON".
2) Check voltage between terminal
@

and ground.

~Ba"ery voltageshouldexist.

OK

2

Ii)
CHECK GROUND CIRCUIT.
1) Turn ignition switch"OFF"
2) Disconnect camshaftpositionsensor
harness connector.
3) Check resistance betweenterminal

@
and ground.

Resistance: Approximately
on

OK
GI-29 NG
Check
thefollowing
items. 1) Harness continuity
between camshaft
position sensorand
battery
2) ECCS relay-1
3) "SR" fusible link
4) Power source for

ECM

5) Ignition switch
Check thefollowing
items. 1) Harness continuity
between camshaft
position sensorand
ground
2) Ground circuitfor

ECM

SG1800-C

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner
DUAL-PRESSURE
SWITCH
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RELAY
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HHA001
HA-34

TROUBLEDIAGNOSES
Circuit Diagram -Air Conditioner (Cont'd)

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MIT
models)

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HHA014

HA-35

TROUBLEDIAGNOSES
Wiring Diagram -
A/C -
(Cont'd)

HA-A/C-03

Refer toEL-POWER.

....
L/R
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ToHA-A/C-06

....
~Nextpage
*5

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*4

A!C

SWITCH

~

:

LHOmodels

RHOmodels

@:
GAengine

@:
GAengine forEurope. Israel
and Australia andSRengine

@:
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HHA004
HA.40