1995 NISSAN ALMERA N15 Service Manual

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
SYSTEM DESCRIPTION
Camshaft positionsensor
Ignition switch Engine
speed
Start signal ECM
(ECCS
control
module) IACV-air
regulator

The IACV-air regulator iscontrolled bythe ECM
at the same timeasfuel pump ON-OFF control.
Condition
Ignition switchisturned to"ON"
Engine running andcranking
When engine isstopped
Except asshown above IACV-air
regulator
operation
Operates for5
seconds
Operates
OFF in1second
OFF

Bimetal

...

Air flow
SEF095K COMPONENT
DESCRIPTION

IACV-air regulator providesanair bypass whentheengine ;s
cold forafast idleduring warm-up.
A bimetal, heaterandrotary shutter arebuilt intotheIACV-air
regulator. Whenthebimetal temperature islow, theairbypass
port opens. Asthe engine startsandelectric currentflows
through aheater, thebimetal beginstoturn theshutter toclose
the bypass port.Theairpassage remainscloseduntilthe
engine stopsandthebimetal temperature drops.

EC-332

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

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

Camshaft positionsensor Engine
speed

~

I

Amount ofintake air
Mass airflow sensor

I

Engine coolant temperature sensor Engine
coolant temperature
I
Ignition switch Start
signal

I

Throttle position sensor Throttle
"position

I
ECM
Inhibitor switch(A/Tmodels)/ Park/Neutral
position (ECCS
control
!
IACV-AAC valve
I

Neutral position switch(M/Tmodels)
module)
Air conditioner switch Air
conditioner operation
Power steering oilpressure switch Power
steering loadsignal

I
Battery Battery
voltage
Vehicle speedsensor Vehicle
speed
I

l
Cooling fan Cooling
fanoperation

I

This system automatically controlsengineidlespeed toaspecified level.Idlespeed iscontrolled
through fineadjustment ofthe amount ofair which bypasses thethrottle valveviaIACV-AAC valve.The
IACV-AAC valverepeats ON/OFF operation according tothe signal sentfrom theECM. Thecamshaft
position sensordetects theactual engine speedandsends asignal tothe ECM. TheECM thencontrols
the ON/OFF timeofthe IACV-AAC valvesothat engine speedcoincides withthetarget valuememo-
rized inECM. Thetarget engine speedisthe lowest speedatwhich theengine canoperate steadily.
The optimum valuestored inthe ECM isdetermined bytaking intoconsideration variousengine
conditions, suchasduring warmup,deceleration, andengine load(airconditioner, powersteering and
cooling fanoperation).

COMPONENTDESCRIPTION
IACV-AAC valve

The IACV-AAC valveismoved byON/OFF pulsesfromtheECM.
The longer theONpulse, thegreater theamount ofair that will
flow through thevalve. Themore airthat flows through the
valve, thehigher theidle speed.

Air SEF040E
EC-335
•

TROUBLEDIAGNOSIS FORNON-DETECTABLE ITEMS~
Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)

EC-AAC/V-01

Refer toEL-POWER.
ECM (ECCS
CONTROL
MODULE)

C£I)

~ ~GY ~~

GIIDID
S
BR

I

$-~
BR BR

1r.fJ1
@)
1$1
rn>
(E203) (E201)

BR SR

*_1
I

BR

~I
IACV-AAC

VALVE

(E213)

~ SB

I

SB

14J1
(E227)

(F12)

SB
I

SB
~
ISC

~ (E213)
~@

@
SR~GY
@:

AlTmodels

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

C£I)
L

EC-336 HEC015

•IGN TIMING ADJ.
0

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)
DIAGNOSTIC PROCEDURE
-- CONDITION SETIING--
IGN/T FEEDBACK HOLD INSPECTION
START

~i5 ~i5

ECM
E[CONNECTORII
cffb

113

=
= =
MONITOR
CAS. RPM (REF)
IGN TIMING
IDLE POSITION
---
---

800rpm
15BTDC
ON
SEF786KA
MEC768B CHECK
OVERALL FUNCTION.
1. Start engine andwarm itup suffi-
ciently.
2. Check idlespeed.

800::1:50
rpm
If NG, adjust idlespeed. (Referto
(l)
e
EC-243.)
3. .. •Perform "IGNTIMING ADJ"

I!I
in"WORK SUPPORT" mode
with CONSULT.
~ •Disconnect IACV-AACvalve

5
harness connector.
4. Ma esure thatidlespeed drops.
Does notdrop
CHECK POWER SUPPLY.
1. Stop engine.
2. Disconnect IACV-AACvalveharness
connector.
3. Turn ignition switch"ON".
4. Check voltage between terminal
G)

and ground withCONSULT ortester.
Voltage: Batteryvoltage
OK

[!1
CHECK OUTPUT SIGNALCIRCUIT.
1. Disconnect ECMharness connector.
2. Check harness continuity between
ECM terminal
CTID
andterminal
(2).

Continuity shouldexist.
If OK, check harness forshort
OK
CHECK COMPONENT
(IACV-AAC valve).
Refer to"COMPONENT INSPECTION"
on next page.
OK Drops
NG
NG
NG INSPECTION
END
Check thefollowing .
• Harness connectors

@D,
([ill)(M/Tmod-
els)
• Harness connectors

@,
@
(A/T
models)
• 7.5A fuse
• Harness foropen or
short between IACV-
AAC valve harness con-
nector andfuse
If NG, repair harness or
con nectors.
Check thefollowing.
• Harness connectors

@,@D

• Harness foropen or
short between ECMand
IACV-AAC valve

If
NG, repair harness or
connectors.
Replace IACV-AAC valve.
•

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
EC-337