1995 NISSAN ALMERA N15 relay

TROUBLEDIAGNOSIS FOROTC12
Mass AirFlow Sensor (MAFS) (Conl'd)
GA16DE forAustralia

EC-MAFS-01

t
-:
Detectable line
for DTC
-: Non-detectable
line forDTC

11

B 8 B

t...l
1

~ ~

ECM
(ECCSCONTROL
MODULE)

em

,

I.

JOINT

CONNECTOR-6

@

--.~=-
-=~I--""

OR W

II}; 1
14-81

QA+ QA-

(

I'

I
I

I

I

I
I

I

I

I

1

I
I
I

I

I ...

r
,
W/R

W
3 MASS

AIR

FLOW

SENSOR

4=!Ilbj:Jlrn>
OR W

Refer
toEL-POWER.
W/L
I

W
/L
tETt'i7\
r=b~

I~I@)

W/L

11iJ,@
=r@
W/L

I

T.

W/L W/L

I~~I
ECCS
~ RELAY

~U:jJJ@
WIG W/R

I

.--_
...

I

"

WIG
W/R W/R

mlf5'sil~

SSOFF VBVB

~I
11[iJ
@

3456 W~~
~BR
~@

IIIIlII.IIIITJ
GY
Refer
tolast page

(Foldout page).

101 102 103
107 108109
113 114 115 104
105 106
110
111
112
116
117
118

HEC064
EC-104

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump
SYSTEM DESCRIPTION

Enginespeed
Camshaft positionsensor
Startsignal
Ignition switch
The ECM activates thefuel pump forseveral sec-
onds aftertheignition switchisturned onto
improve enginestartability. Ifthe ECM receives
a 180
0
signal fromthecamshaft positionsensor,
it knows thattheengine isrotating, andcauses
the pump toperform. Ifthe 180
0
signal isnot
received whentheignition switchison, the
engine stalls.TheECM stops pump operation
and prevents batterydischarging, thereby
improving safety.TheECM does notdirectly
drive thefuel pump. Itcontrols theON/OFF fuel
pump relay, which inturn controls thefuel pump.
ECM

(ECCS
control module)
Condition
Ignition switchisturned toON.
Engine running andcranking
When engine isstopped
Except asshown above Fuel
pump relay
Fuel pump operation
Operates for
5 seconds
Operates
Stops in1second
Stops
•

COMPONENT DESCRIPTION

A turbine typedesign fuelpump isused inthe fuel tank.

AEC801
EC-145

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Cont'd)

EC-F/PUMP-01

IGNITION SWITCH
ON or START
FUELTANK
GAUGE
UNIT



For
Europe
Except forEurope

@
106
@
104

,

Detectable line
for DTC
Non-detectable line forDTC

@:

@:

*1 :

-:
-:

Refer
toEL-POWER.
FUSE
BLOCK
(JIB)


ECM (ECCSCONTROL
MODULE)

em

15A

ITZJ

B/P
IG":4rn

r::b~

IIlJI
CEID

B/P

I
B/P

wrn
FPR
/I
N•6
1
I
N.61

BIL B/W

IT
I~IFUEL
n

PUMP

U
RELAY

Ibi=JI~CMD
B/P
B/Y
I
aID@)

------ B/Y~
I-
B/Y
------1

B/Y

m

lbi=Jl~
B

~1
FUEL

M
PUMP

~

lbi=Jl
B
m~

lbi=Jl
B

I

,-,

B B

-::!:- ~

~~

ACMD

T
L
~@

rnrn W
~~
w.g;
GY
rQ,~

L!J.gj
Refer
tolast page

(Foldout page).

HEC040
EC-146

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS

Fuel Pump
(Conl'd)

GA 16DE forAustralia

EC-F/PUMP-01

•

FUEL
TANK
GAUGE
UNIT

~

-:
Detectable line
for oTC
-: Non-detectable
line foroTC
ECM (ECCS
CONTROL
MODULE)

(ill

FUSE
RefertoEL-POWER.
BLOCK

(J/B)

~

s/P~

r=:b~

'Ill'
CEID

B/P

I

S/P

m
FPR
U
N•5
1
I
~51

slL
B/W

II!' I~I
(UEL

n

PUMP

U
RELAY

~1bi=Jl@)
s/P s/Y

1
s/Y
-if]
r
s/Y
-----1

(@
([D

s/Y

ITil

~~
S

~1
FUEL

M
PUMP

~
~
s

ITil~

~ B

I

,.

B S
-:!: ..L..

(J311)
@

IGNITION
SWITCH
ON or START

AQID

T
L
~(@

tmJ
W
~

@
GY
~~

\J.l.SI
rQ,~

W£.J
Refer
tolast page
(Foldout page).

101 102
103
107 108
109
113 114
115 104
105106
110
111
112
116
117
118

HEC072
EC-147

Checkthefollowing.
• Harness connectors

CID,@

• Harness foropen or
short between ECMand
fuel pump relay
If NG, repair harness or
connectors.

NG
OK
CHECK
OUTPUT SIGNALCIRCUIT.

1. Disconnect ECMharness connector.
2. Check harness continuity between
ECM terminal
@,
@
or
@
and
fuel pump relayconnector terminal

@.

Continuity shouldexist.

If OK, check harness forshort.
INSPECTION
START

m
CHECK OVERALL FUNCTION.
~
INSPECTION
END
1. Turn ignition switch"ON".
2. Pinch fuelfeed hose withfingers.

Fuel pressure pulsation shouldbefelt
on the fuel feed hose for5seconds
after ignition switchisturned "ON".

NG

Ii)
CHECK POWER SUPPLY.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
--+

•15A fuse
2. Disconnect fuelpump relayfromrelay •
Harness foropen or
box. short
between fuseand
3. Turn ignition switch"ON". fuel
pump relay
4. Check voltage between terminals
G),
IfNG, repair harness or

@
and ground withCONSULTor connectors.
tester.
Voltage: Batteryvoltage

OK

[!]
CHECK POWER GROUND CIRCUIT.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
--..

•Harness connectors
2. Disconnect fuelpump harness con-
@,CID

nector. •
Harness connectors
3. Check harness continuity between
@,@)

terminal
@
and body ground, termi- •
Harness foropen or
nal
G)
and fuel pump relayconnector short
between fuel
terminal
CID.
pump
andbody ground

Continuity shouldexist.
•
Harness foropen or

If
OK, check harness forshort. short
between fuel
OK pump
andfuel pump
relay
If NG, repair harness or
connectors .

.

IE

AEC884
SEF479P
MEC266B
MEC267BA

~
DISCONNECT

~ E~D

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Cont'd)
DIAGNOSTIC PROCEDURE

Fuel pump harness connector

0111 ~

Driver's
dashlower

SEF4B7QEC-148

Replacefuelpump relay.

NG
CHECK COMPONENT

(Fuel pump relay).
Refer to"Component Inspection"below.

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS

Fuel Pump (Cont'd)

@

1

~i5

ECM
Ej'coNNECTORII

8 104 108

II

OK

•

Replace
fuelpump.

NG
OK
Trouble isnot fixed.
Di!?connect
andreconnect harnesscon-
nectors inthe circuit. Thenretest.
CHECK
COMPONENT
(Fuel pump).
Refer to"COMPONENT INSPECTION"
below.

SEF149R

Orpm

---
---

=
=
=
MONITOR
CMPS.RPM(REFj

104
:
Except forEurope andAustralia

106 :
For Europe
8 :For Australia

Ii •
ACTIVE TEST.
D

FUEL PUMP RELAY
ON

I
ON
I_I

OFF
I

MEF309F
Check
ECMpinterminals fordamage or
the connection ofECM harness connec-
tor. Reconnect ECMharness connector
and retest.
INSPECTION END

No

Yes

Continuity
Conditions
12V direct current supply
between terminals
CD
and
@

No current supply

If NG, replace relay.

COMPONENT
INSPECTION

=
Fuelpump relay

Check continuity betweenterminals
CID
and
CID.

SEF511P
-Fuelpump

1. Disconnect fuelpump harness connector.
2. Check resistance betweenterminals
CD
and
@.

Resistance:
0.2-5.0n
[at
25°C (77°F)]

If NG, replace fuelpump.

EC-149

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
SYSTEM DESCRIPTION Idle
AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve

Camshaft positionsensor Engine
speed

I
Mass
airflow sensor Amount
ofintake air

I

Engine coolant temperature sensor Engine
coolant temperature

~

I

Ignition switch Start
signal

I

Throttle positionsensor Throttle
position

~

I

Inhibitor switch(A/Tmodels)/
Park/Neutralposition
Neutral position switch(M/Tmodels) ECM
(ECCS
Air conditioner operation control

!
IACV-AAC valve
I

Air conditioner switch
module)
Power steering oilpressure switch Power
steering loadsignal

I
Battery
~
Battery voltage
Vehicle speedsensor Vehicle
speed
Cooling fanrelay Cooling
fanoperation
Load switch' Electrical
load
Blower fanswitch Blower
fanoperation
': Rear window defogger switchandheadlamp switch.

This system automatically controlsengineidlespeed toaspecified level.Idlespeed iscontrolled
through fineadjustment ofthe amount ofair which bypasses thethrottle valveviaIACV-AAC valve.The
IACV-AAC valveopens andcloses (except forEurope andIsrael), orrepeats ON/OFF operation (for
Europe andIsrael), according tothe signal sentfrom theECM. Thecamshaft positionsensordetects
the actual engine speedandsends asignal tothe ECM. TheECM thencontrols theIACV-AAC valveso
that engine speedcoincides withthetarget valuememorized inECM. Thetarget engine speedisthe
lowest speedatwhich theengine canoperate steadily. Theoptimum valuestored inthe ECM isdeter-
mined bytaking intoconsideration variousengineconditions, suchasduring warmup,deceleration, and
engine load(airconditioner, powersteering andcooling fanoperation).

COMPONENT DESCRIPTION
IACV-AAC valve-Except forEurope andIsrael

The IACV-AAC valveismoved byopen andclose signals from
the ECM. When theopen signal issent tothe valve, theamount
of air that willflow through thevalve increases. Themore air
that flows through thevalve, thehigher theidle speed. When
the close signal issent tothe valve. theamount ofair
decreases.

EC-150

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS

Cooling FanControl

SYSTEM DESCRIPTION
Vehicle speedsensor
Engine coolant temperature sensor
Air conditioner switch Vehicle
speed
Engine coolant temperature
Air conditioner "ON"signal
EGM

(EGGS
control
module) Gooling
fan relay(s)
MIT MODELS
The ECM controls thecooling fancorresponding tothe vehicle speed,engine coolant temperature, and
air conditioner ONsignal. Thecontrol system has2-step control [ON/OFF].

Operation
For Europe withdaytime lightsystem

E~
::J
0

~Z;
2i
o

E

~
~

'0
o

o

Gl

c

'0>
c

w
Air
conditioner switchIs"OFF".

/,

100 (212)

95 (203)

rr

20 80

(12) (50)

Vehicle speedkm/h(MPH)

D :
Cooling fansdonot operate.
~
iL
Airconditioner switchIs"ON".

~ ~ 11'l1/1~~~
:v
() /'/"

0.
0

E
~

!
95(203)

.~ 2080

ill
(12)(50)

Vehicle speedkm/h(MPH)

EZ2l :
Cooling fansoperate.
SEF902P

For Europe withoutdaytime lightsystem andAustralia

Gl_

2~
.,
-

:v ()

0.0

E
~
~

'0
o

o

Gl

c

'0>
c

w
Air
conditioner switchIs"OFF",

105 (221)

95 (203)
91 (196)

2080

(12) (50)

Vehicle speedkm/h(MPH)

D :
Cooling fansdonot operate.
Air
conditioner switchIs"ON",

100 (212)

2080

(12) (50)

Vehicle speedkm/h(MPH)
~ :Cooling fansoperate.
SEF649MB
EC-156