1995 NISSAN ALMERA N15 fuel pump

TROUBLEDIAGNOSIS -General Description
CONSULT Reference ValueinData Monitor
Mode

Remarks:
• Specification dataarereference values.
• Specification dataareoutput/input valueswhicharedetected orsupplied bythe ECM atthe connec-
tor.

*
Specification datamaynotbedirectly relatedtotheir components signals/values/operations.
(Le., Adjust ignition timingwithatiming lightbefore monitoring IGNTIMING. Specification datamight
be displayed evenwhen ignition timingisnot adjusted tospecification. ThisIGNTIMING moni-
tors thedata calculated bythe ECM according tothe input signals fromthecamshaft position
sensor andother ignition timingrelated sensors.)
• Ifthe real-time diagnosis resultsareNG, andtheon-board diagnostic systemresultsareOK, when •
diagnosing themass airflow sensor, firstcheck tosee ifthe fuel pump control circuitisnormal.

MONITOR ITEM CONDITION
SPECIFICATION
CMPS.RPM (REF)•
Tachometer: Connect Almostthesame speed asthe CON-
• Run engine andcompare tachometer indicationwiththeCONSULT value.SULTvalue.
• Engine: Afterwarming up
Idle 1.3-1.7V
MAS AIR/FL SE •
Air conditioner switch:OFF
• Shift lever: "N"
• No-load 2,000
rpm 1.7-2.1V
COOLAN TEMPIS •
Engine: Afterwarming up More
than70°C (15S0F)
02 SEN 0-
0.3V .....0.6 -1.0V
• Engine: Afterwarming up Maintaining
enginespeedat2,000
LEAN
+-->
RICH
MIR
FIC
MNT rpm
Changesmorethan5times
during 10seconds.
VHCL SPEED SE•
Turn drive wheels andcompare speedometer indicationwiththeCONSULT Almostthesame speed as
value the
CONSULT value
BATTERY VOLT •
Ignition switch:ON(Engine stopped) 11
-14V
• Ignition switch:ON Throttle
valvefullyclosed
0.35-0.65V
THRTL
pas
SEN
(Enginestopped)
Throttlevalvefullyopened Approx.4.0V
START SIGNAL •
Ignition switch:ON
->
START
->
ON OFF

->
ON
->
OFF
Throttle valve:
ON
• Ignition switch:ON Idle
position
CLSD THLIPOSI
(Enginestopped)
Throttlevalve:
Slightly open OFF
Air conditioner switch:OFF OFF
AIR COND SIG •
Engine: Afterwarming up,idle the
engine Air
conditioner switch:ON
ON
(Compressor operates)
Shift lever "P"or"N" ON
PIN POSI SW •
Ignition switch:ON
Exceptabove OFF

EC-277

TROUBLEDIAGNOSIS -General Description
[]K]

CONSULT Reference ValueinData Monitor
Mode (Cont'd)

MONITOR ITEM
CONDITION SPECIFICATION
Steering wheelinneutral
position OFF
PW/ST SIGNAL
•Engine: Afterwarming up,idle theengine (forward
direction)
The steering wheelis
ON
turned
• Engine: Afterwarming up
Idle2.5-3.7 msec .
INJ PULSE •
Air conditioner switch:OFF
• Shift lever: "N"
• No-load 2,000
rpm 1.9-2.8 msec .
Idle 13-15° BTDC
IGN TIMING
ditto
2,000rpm Morethan25°BTDC
Idle 20-40%
IACV-AACIV ditto
2,000rpm

-

A/F ALPHA •Engine: Afterwarming up Maintaining
enginespeed
53-155%
at 2.000 rpm
AIR COND RLY •Air conditioner switch:OFF
-+
ON OFF
-+
ON
• Ignition switchis~urned toON (Operates for5seconds)
• Engine running andcranking ON
FUEL PUMP RLY
•When engine isstopped (stopsin1.0 seconds)
• Except asshown above OFF
Engine coolant temperature
is 94°C (201°F) orless for
AfT models. and99°C OFF
(210°F) orless for
M/T
mod-
els
• After warming upengine. idletheengine. Engine
coolant temperature
is between 95°C(203°F) and
COOLING FAN •Air conditioner switch:OFF
104°C(219°F) forA/T mod- LOW
• Vehicle stopped
elsonly
Engine coolant temperature
is 105°C (221°F) ormore for

A/T
models. and100°C HIGH
(212°F) ormore for
M/T

models
• Engine: Afterwarming up
IdleON
EGRC SOLIV •
Air conditioner switch:OFF
• Shift lever: "N"
• No-load 2.000
rpm OFF

EC-278

TROUBLEDIAGNOSIS -General Description
[]K]

ECM Terminals andReference Value(Cont'd)

'Data arereference values.
TERMINAL WIRE
ITEM CONDITION
'DATA
NO. COLOR
Ilgnitionswitch"ON"I

L
For 5seconds afterturning ignition switch
"ON" Approximately
OV
104 B/P Fuelpump relay !Engine
isrunning.1
Ilgnition switch"ON"I
BATTERY VOLTAGE

L
5seconds afterturning ignitionswitch
(11-14V)
"ON" andthereafter
IEngine isrunning.1
0.6-0.8V
EGR valve
&
EVAP

.L
Engine speedis4,000 rpm.
105 P canisterpurgecontrol
solenoid valve IEngine
isrunning.1
BATTERYVOLTAGE

L
Idle speed (11
-14V)
107 IEngine
isrunning.j
B/Y ECCSground

L
Engine
ground
108 Idlespeed
!Engine isrunning.1
Approximately0.2V

L
Engine speedisbelow 3,200rpm.
Heated oxygen sensor
111 OR
heater IEngineisrunning.1
BATTERY VOLTAGE

L
Engine speedisabove 3,200rpm. (11
-14V)
IEngine isrunning.\
11-14V

L
Idle speed
113 SB IACV-AAC
valve lEngine
isrunning.1

~ Sle«;ng wheel;,be;ng I"med

2-11V
Air conditioner isoperating.
Rear window defogger switchis"ON".
Lighting switchis"ON".
!Engine isrunning.1
ApproximatelyOV
Torque converter
L

Idle speed
115 P/B clutch
solenoid valve
IEngineisrunning.1 (Warm-up condition)

(A/T
models)

L
Vehicle speedis60 km/h (37MPH) or BA
TTERY VOLTAGE
(11 -14V)
more in"D" position
116 BIY ECCS
ground IEngine
isrunning.1
Engineground

L
Idle speed

EC-285
•

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