1995 NISSAN ALMERA N15 AUX

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

IACV-AACvalve

Disconnect IACV-AACvalveharness connector.
• Check IACV-AAC valveresistance.
Resistance: Approximately 100[at25°C (77°F)]
• Check plunger forseizing orsticking.
• Check forbroken spring.

MEC770B

TROUBLE
DIAGNOSIS FORNON-DETECTABLE ITEMS
[ill

Idle AirControl Valve(IACV) -Auxiliary Air
Control (AAC)Valve(Cont'd)

COMPONENT INSPECTION
EC-338

SAEJ1930 TERMINOLOGY LIST
SAE J1930 Terminology List(Cont'd)
***:
Not applicable
NEW TERM NEW
ACRONYM /
OLDTERM
ABBREVIATION
Evaporative emissioncanisterpurgecontrol EVAPcanister purgecon-
Canister purgecutvalve
valve trol
valve
Evaporative emissioncanisterventcontrol EVAPcanister ventcontrol

***

valve valve
Evaporative emissioncanisterpurgevolume EVAPcanister purgevol-
Canister purgecontrol valve
control valve ume
control valve
Evaporative emissioncontrolsystem pressure EVAP
control system pres-

***

sensor suresensor
Evaporative emissionshutvalve EVAP
shutvalve Shutoffvalve
Evaporative emissionsystem EVAPsystem Evaporative
emissioncontrolsystem
Exhaust gasrecirculation valve EGR
valve EGRvalve
Exhaust gasrecirculation control-BPTvalveEGRC-BPT valve BPT
valve
Exhaust gasrecirculation control-solenoid
EGRC-solenoidvalveEGR
control solenoid valve
valve
Exhaust gasrecirculation temperaturesensorEGRtemperature sensorExhaustgastemperature sensor
Flash electrically erasableprogrammable
FEEPROM
***

read onlymemory
Flash erasable programmable readonly
FEPROM
**.

memory
Flexible fuelsensor FFS
***

Flexible fuelsystem
FFsystem
***

Heated Oxygen sensor H02SExhaustgassensor
Idle aircontrol system lACsystem Idlespeed control
Idle aircontrol valve-air regulator IACV-airregulator Airregulator
Idle aircontrol valve-auxiliary aircontrol
IACV-AACvalve Auxiliaryaircontrol (AAC)valve
valve
Idle aircontrol valve-FICO solenoidvalve
IACV-FICDsolenoidvalve FICOsolenoid valve
Idle aircontrol valve-idle upcontrol solenoid IACV-idleupcontrol sole-
Idleupcontrol solenoid valve
valve noidvalve
Idle speed control-FI pot ISC-FIpot FIpot
Idle speed control system ISCsystem
***

Ignition controlmodule ICM
***

Indirect fuelinjection system IFIsystem
***

Intake airtemperature sensor IATS Airtemperature sensor
Knock
***

Detonation
Knock sensor
KSDetonation
sensor
Malfunction indicatorlamp MIL
Checkengine light
Manifold absolutepressure MAP
***

Manifold absolutepressure/Barometric pres-MAP/BARO switchsolenoid

***

sure switch solenoid valve valve
Manifold absolutepressure sensor MAPS
**.

Manifold differential pressure MOP
***

Manifold differential pressuresensor MOPS
***
GI-46

SUPPLEMENTALRESTRAINTSYSTEM(SRS)
Description

The airbag deploys ifthe diagnosis sensorunitactivates whiletheignition switchisinthe "ON" or
"START" position.

Single anddual airbag systems

Ignition
switch

(ON orSTART)
Driver
air
bag module
Diagnosis sensorunit
• Auxiliary powersource (condenser)

• CPU

Battery

Seat beltpre-tensioner

G-Iorce whendecelerating
(greater thanthepredetermined setting)
o

Drive circuit
• G sensor
• Saling sensor Passenger
airbag module
(For dual airbag system)

MRS069AB

Mechanical sensor
Seat belt Mechanical
trigger
Retractor shaft Piston
andwire rope

•

Combined intoseat beltretractor

SRS126
RS-9