1995 NISSAN ALMERA N15 relay

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump
SYSTEM DESCRIPTION

I
Camshaft positionsensor
I

Engine speed

~

ECM
(ECCS Fuel
control pump
!,gnition switch Start
signal
relay

I
module)

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.
Condition
Ignition switchisturned to"ON"
Engine running andcranking
When engine isstopped
Except asshown above Fuel
pump operation •
Operates for
5 seconds
Operates
Stops in1second
Stops

COMPONENT DESCRIPTION

The fuel pump withafuel damper isan in-tank type(thepump
and damper arelocated inthe fuel tank).

AECB01
EC-327

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS
[]K]

Fuel Pump (Cont'd)

EC-F/PUMP-01

IGNITION SWITCH
ON 01"' START

15A

IJI)
FUSE
BLOCK
(JIB)

(M15) ReteI"'
toEL-POWER. -:
Detectable line
tal"'
DTC

-: Non-detectable
line tal"'DTC
FUEL
TANK

GAUGE

UNIT

(B17)
ECM (ECCS
CONTROL
MODULE)

(ffi

B/P

r=b~

I~I@

B/P

I

B/P

~ FPR

U
N•61

I
N.61
B/L B/W

II!
]I(UEL
n

PUMP

U
RELAY

Ibi=JlIbiJCHD
B/P
B/Y

1
B/Y~~B/Y
----_1

(@ (]I)

B/Y

m

~@
B

~1
FUEL
M PUMP
~
~ B

m@

~ B

I

,-,

B B

...L ...L

(811)
(832)

A
T
L
FillJ@
m
w
~@

0.J.g)
~@

I..!.@J
Refer
tolast page
(Foldout page).

(ffi
L

HEC012
EC-328

•

INSPECTION
START

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
aller ignition switchisturned "ON".

NG

m
.

CHECK POWER SUPPLY.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
~

•15A fuse
2. Disconnect fuelpump relay.
•Harness foropen or
3. Turn ignition switch"ON".
shortbetween fuseand
4. Check voltage between terminals
CD,

fuelpump relay

@
and ground withCONSULTor
IfNG, repair harness or
tester. connectors.

Voltage: Batteryvoltage

OK

[!l
CHECK POWER ANDGROUND CIRCUIT.
NG
Check thefollowing.
1. Turn ignition switch"OFF".
~

•Harness connectors
2. Disconnect fuelpump harness con-

@,Cill

nector. •Harness foropen or
3 Check harness continuity between
shortbetween fuel
terminal @and body ground, termi-
pumpandbody ground
nal
CD
and fuel pump relayconnector
•Harness foropen or
terminal
@.

shortbetween fuel

Continuity shouldexist.

pumpandfuel pump
If OK, check harness forshort.
relay
OK
If

NG, repair harness or
connectors.

I!]
CHECK OUTPUT SIGNALCIRCUIT.
NG
Check thefollowing.
1. Disconnect ECMharness connector.
~

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

ECM terminal
Gill
andfuel pump
•Harness foropen or
relay connector terminal@.
shortbetween ECMand

Continuity shouldexist.

fuelpump relay
If OK, check harness forshort.

If
NG, repair harness or
~OK connectors.

o

SEF479P
MEC267BA
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Conl'd)
DIAGNOSTIC PROCEDURE

Under therear seat

"---
EC-329

Replacefuelpump relay.

NG
CHECK COMPONENT

(Fuel pump relay).

(ij\
1.Reconnect fuelpump relay,
~ fuelpump harness connector
and ECM harness connector.
2. Turn ignition switch"ON".
3. Turn fuelpump relay"ON"
and "OFF" in"ACTIVE TEST"
mode withCONSULT and
check operating sound.

OR

fti>\
Referto"COMPONENT
~ INSPECTION" onnext page.

OK
MEC332B
D
ON
Orpm

---
---

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Coni'd)

@

1

• ACTIVE TEST.
FUEL PUMP RELAY

= = =
MONITOR
CMPS.RPM(REFj
~i5

ECM
B
CONNECTOR
II

104

II

_o_N_I_'
OFF
I

MEF309F
CHECK
COMPONENT
(Fuel pump).
Refer to"COMPONENT INSPECTION"
on next page.
NG

Replace fuelpump.

OK

Disconnect andreconnect 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-330

Fuelpump

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

. Resistance: 0.2-5.0n [at25°C (77°F)]

If NG, replace fuelpump.
•

Yes
No

Continuity

If NG, replace relay.

Conditions
12V direct current supply
between terminals
G)
and
@

No current supply

SEF511P
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
Fuel Pump (Conl'd)
COMPONENT INSPECTION

=
Fuelpump relay

Check continuity betweenterminals
CID
and
@.).

EC-331

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS[]:[]
Idle AirControl Valve(IACV)-Air Regulator
(Cont'd)

EC-AIRREG-01

IN.61IN•6
1
B/L B/W

I I

B/L B/W

IT
I~IIFCEL
n

PUMP

U
RELAY

IbJdlIbiJlCBD
B/P B/Y
Refer
toEL-POWER.

•

<:E>:

AIT
models

:
MITmodels
... :Detectable line
for DTC
---: Non-detectable
line forDTC

t

14>
~

B/Y B/YB/Y

r=b@})
r-!-,
@
,..-!-,
@

I~ICHID
~(E203)~(E20t)

B/Y B/YB/Y

t_f

I

B/Y

rn
1
IACV-AIR
REGULATOR

Clli:4)

~ B

I

B

1$1
(E227)

(ffi)

B

In

B BB

fJ
1

mm

ECM
(ECCS
CONTROL
MODULE)

(ill

FUSE
BLOCK
(JIB)


15A

[ill

B
IP
tG"Ai'\\

d:::,~

IllJl
C£[)

B/P

I

B/P

~
FPR
IGNITION
SWITCH
ON orSTART

ACBD

T
L
~(E203)

rnrn:tzlID
GY
ffiill@W

~B .r.'T;:;,..

(Eli4)

LJ...1J£p
GY
Refer
tolast page
(Foldout page).

CHID
(EJon

,

~

~@

~GY

em
L

HEC013
EC-333

ReplaceIACV-air regula-
tor. Check
thefollowing.
• Harness connectors

Cill),
@ID

• Harness foropen or
short between IACV-air
regulator andbody
ground
If NG, repair harness or
connectors.

NG

I

INSPECTION
START

OK.

INSPECTION END

OK

CHECK
GROUND CIRCUIT.
1. Turn ignition switch"OFF".
2. Check harness continuity between
terminal
@
and body ground.
Continuity shouldexist.

If
OK, check harness forshort.
CHECK COMPONENT
(IACV-air regulator).
Refer to"COMPONENT INSPECTION"
below.

I

CHECK CONTROL FUNCTION. NG
Check fuelpump control
1. Turn ignition switch"ON".
~

circuit.
2. Pinch fuelfeed hose withfingers. (See
page EC-327.)
Fuel pressure pulsation shouldbefelt
on the fuel feed hose for5seconds
after ignition switchisturned "ON".

I;)
1
0K
CHECK POWER SUPPLY. NG
Check thefollowing.
1. Turn ignition switch"OFF".
~

•Harness connectors
2. Disconnect IACV-airregulator har-
@,@})

ness connector. •
Harness connectors
3. Turn ignition switch"ON".
@D,

(M/T
mod-
4. Check voltage between terminal
G)
els)
and ground. •Harness connectors
Battery voltage shouldexistfor5sec.
@,

@
(A/Tmodels)
onds afterignition switchisturned •
Harness foropen or
"ON". short
between IACV-air
OK regulator
andfuel pump
relay

If
NG, repair harness or
connectors.

MEC7368
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS~
Idle AirControl Valve(IACV)-Air Regulator
(Cont'd)
DIAGNOSTIC PROCEDURE

~15
~
~
~15

~ ~
MEC7378COMPONENT INSPECTION
IACV-air regulator

Disconnect IACV-airregulator harnessconnector.
• Check IACV-air regulator resistance.
Resistance: Approximately
70•80n
[at25°C (77°F))
• Check IACV-air regulator forclogging.

EC-334

MEF023D
•

Refer to"TROUBLE
DIAGNOSES"
i!1
HA sec-
tion. INSPECTION
END
Check thefollowing.
• Harness connectors

@D,@!)

• Harness foropen or
short between IACV-
FICO solenoid valve
harness connector and
air conditioner relay
If NG, repair harness or
connectors.

OK
NG
NG
CHECK
OVERALL FUNCTION.

1. Start engine andwarm itup suffi-
ciently.
2. Check idlespeed.

800:1::50
rpm

If NG, adjust idlespeed.
3. Turn airconditioner switchand
blower fanswitch "ON".
4. Recheck idlespeed.

850 rpm ormore

Check ifair conditioner compressor
functions normally.

DIAGNOSTIC
PROCEDURE
OKNG
OK

INSPECTION
START

CHECK POWER SUPPLY.

1. Stop engine.
2. Disconnect IACV-FICDsolenoidvalve
harness connector.
3. Start engine, thenturnairconditioner
switch andblower fan"ON".
4. Check voltage between terminal
CD

and ground withCONSULT ortester.

Voltage: Batteryvoltage
AEC765
MEF634E
TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[]liJ

Idle AirControl Valve(IACV)-FICD Solenoid
Valve (Cont'd)
COMPONENT DESCRIPTION

When theairconditioner ison, the IACV-FICD solenoidvalve
supplies additional airtoadjust tothe increased load.
Idle
adjusting
screw

EC-341