a7e1ab6709d94def65da99bc61cdda5102295273d7b6c29c35a62cc08837968b

nsxe11008a.pdf

System Description
Electrical Connections
Main Menu Table of Contents
System Description
Electrical Connections
MAIN RELAY
FUEL PUMP
RESISTOR
SWITCH
®
m
IGNITION (D
©
I`
v
A
(D ∙ J
J\ I`
A25 IGP] ∙
≺∶↿ IGPZ PGZ A24 ∙
∁↿↿ STS FLRI A1 ∙ ⊽
ELR: Aa ∙
FUSES ∙ A26 La1 ∙ −−−
o CLOCK(7.5A)X i6: In HIS under-hand –
o mamon“ fuse/relay box ∙ INIEOTOR H
o лестным m: In tho angina _ RESISTOR
o IG comun)“ comranmenl . INJECTDRS
o “0.2““, fuse relay box N”
o No.5(1nAI B11 CYL 1P um A1 ∙ ∙ ∙∙ ∙
o No.4(15A) No.2
o кипы] B12 CVL 1M INJ2 A3 ∙ ∙ n ∙
NM
m CRNK 2P INJa A5 ow
CRANK( Lm сник гм IHII A2 ош-
CVL
SENSO” s15 CRNK 1P INJ5 A4 om.
m CRNK1M um As ∙ ∙ ∙∙ ∙ ∙
as CYL 2P
EACV
¡no CYL гм EACV A9 ∙ ∙ ∙∙ ∙
CHECK ENGINE
SPEED SENSOR a LIGHT
VIA:- ∙ cz VSP WARN A13 J‘ @
∎ −
∙ ES A11
T вея CONTROL SOLENOID VALVE
PSS’I‘TIBNSHIFT AT NP sw
‹-— ∙ D7
≣⊱⇃⇡⇃⊺⊖∁↨⊋↿⇂⋮ MT N sw PURGE CUT—OFF SOLENOID VALVE
∣ ∙ C7 IIITCLS PGS A20 ∙ ∙ ∙∙ ∙
ó ∙ SERVICE
MIT NEUTRAL NIT CLUTCH gggg‘gcm ups m ∙ ∙ ∙∙ ∙
SWITCH SWITCH CHAMBER VOLUME CONTROL
E ∙ ca scs SOLENOID VALVE 1
AUTO AIc т т ⋮ ⋅ с
mian RADIATOR AIC CLUTCH RELAY
∙ ⊑⇡≻↾↾⇃⇃⊺⊓⋄∟ D Acc A15 ∙ ∙ ∙∙ ∙
UNIT RADIATOR FAN RELAV
∙ ∙ ∙ ∙ c3 Acs FANCNT мн ∙ ∙ ∙∙ ∙
A A ENGINE ROOM FAN RELAV
– ∙ ∙ w ∙ 05 PDSW ∙ ∙∙ ∙
−⊤− AIC −−−− AIC
PRESSURE PRESSURE ⋮
SWITCH A SWITCH в
11-8
(cont’d)TERMINAL LOCATION
Main Menu Table of Contents
.a
A
IGNITER UN” IGNITION COIL
No.1
.0 D19 vcc1 IG No.1 A21 ∙ ‘w
∙ Dzo vccz IG No.2 A22 ‘ ‘ ” ‘
.o D21 SGI IG No.3 aa ‘ ° ‘° °
∙ Dzz sez IG “0.4 sa ‘ N“ °
D .
¿wm Ü D17 PB IG No.5 a4 `I o “0006 C
F ∙ Ds поит IG No.6 sa ∙ ‚щ O“ w “O
THROTTLE ‘- TADIIONIETER
ANGLE D11 !TH CONNECTOR
SENSOR −−−∙ −
G NEP c4 ⋅ ∎
IGNITION
TIMING De IGADJ TCSTE D12
ADJUSTER _.
TCFC cs F
EGR LIFT ⊺∁⋮
SENSOR É D12 EGHL TCOUT CID lCJOHNTTROL G
_o
TCINH Co H
ACCELERATOR
PEDAL ANGLE ∙ D6 мог- VREF ma
SENSOR
II
TA SENSOR G
ALTERNATOR ∙ IA ∙ ∙ D15 TA AESA F1
1
∙ ∙ H ∙ ∙ D13 Tw AFSD F3
∙ Tw SENSOR
o FAS A15
I
09 AceF
FRONT AID HTCNTE FRONT SPOOL REAR SPOOL
HEATED SOLENOID VALVE ‘SOLENOID VALVE
VTSR F7 ∙ ∙ ∙∙ ∙
Ê?
A12 IITCNTTI VTMF F2 ∙ ∙ ∙ −
:r DISOer VTNREI ∙
∣−−−−−− − REAR VALVE REAR VALVE
;ggw I: ∣ ”3 KS“ TIMING OIL D D TIMING OIL
mon −−−− −−↲ l __ _ PRESSURE PRESSURE
02 5 И . г m KSF SWITCH SWITCH
‘ i
_ll-
⊆∙ ⊏↿
IE
D т т
REAR FRONT
KNOCK KNOCK
SENSOR SENSOR
11 .. .. .. .. ⋯⋯⋯⋅⇁⋅⋎⋯⋯↿≤ .. .‚ .. .. .. ⋅∣∣⋅⋯⋅≙ .. „. .I ⊏∣ .. … .. 111 .11 .. .. 11111111111111.1111 .1 I. .. n
0000000000000 00000000 000000 00000000000 0000
0000000000000 00000000 000000 00000000000 0000
A: ∥ ц n.mmmmumuumm n ∎∎ ∎∙ u nam—„m 😡 u u n cum
TERMINAL LOCATION
In м м ы quImIouou-mn
n u п n
(cont’d)
11-9
System Description
Electrical Connections (cont’d)
(To page 11-11)
Main Menu Table of Contents
System Description
Electrical Connections (cont’d)
cm
___ ELK.–
BLKIVEL
wm
GRNIWHT
FRONT HEATED
02 SENSOR
C148
__ aLK/BLu__
BLK/VEL
HEDIBLU ∎
(sanqu
A REAR HEATED
o; SENSOR
c155 опа csno C527 c534
YELIWH” VEUWHT YELIWHT
I_ _
GRNIWHT I GRNIWHT −∎ “me MAP SENSOR
WHT I—-—WHT
l степ cm
–msŁs-u ::a
−∎ −−− ¡É
__ELUIGHN___
¡É
__BLUIVEL___
¡É
__0RNIBI.U___
–WNT/BLU __ ¡É
он” − ¡É
−−⋮⋁⋯⊺⋮⋮⋮⋮
ERN/ELK
.
REDiWHT
— —
GHNIWHT ∎∎ ∎
YEL/WH’Í
REDIYEL
RED/ELK I
C D E
c140
I
I “mm” TA SENSOR
c150 cm csoo c527 csaa
enu/wm enu/wm ∣≺⋮⋯⊺∣∘∥

YELIWHT — YEL/WHT TIMING
„N ADJUSTER
‚_
aan anu
ELK/VEL C161 C473
(To page 11-11) F
11-10
(From page 11-10)
(cont’d)
(To page 11-13)
Main Menu Table of Contents
(From page 11-10)
I C143
BLKIVEL
WHT —
WHT/GRN
WHTIBLK
WHTIBLU
WHTIVEL
WHT/RED
To No.1 IGNITION сои. ∢−−∙−↿↾⇃∦⊺ ∣⋃⊝↾⋢⇃∣∣⊺⊺⋮∏
⊺∘ No.2 IGNITION COIL ∢∙−−⋁⇃⊦↿⊺∣≺≅∏↾⇃
To мы IGNITION COIL <—WHTIBLK To No.4 IGNITION COIL <—-—WHTIBLU Та ums IGNITION COIL o—wwm To No.5 IGNITION COIL <——-WHTIRED ELK Em ⊤ cm ama C119 VEL/RED — ELK/VEL SPEED SENSOR JrELK G _ A ∖ c132 cm с"? FRONT WHT WHT −−− ⋅⋅−− m ш −−≔⊣ − “mw,” E KNOCK SENSOR −−∙∘∣⋅∎∥⇃∙−− cm REAR −−∙∘⊓↾⇃−⊣−− KNOCK SENSOR cm BLU/RED VEL/ELK ⋮⋀∁∨ VELIBLK H с cm cua “5 mm ∣−−−−⋯∣⊟⊔≺−⇃ ≣≣↾⋍∃∔∣⊓∥≺⋚⇂⋮⋃∧∥∥∣↾ C412 WHTIRED ALTERNATOR LT GRN BLK NEUTRAL SWITCH I (To page 11-13) G101 (cont'd) 11-11 System Description Electrical Connections (cont'd) Main Menu Table of Contents System Description Electrical Connections (cont'd) 61610475 0612 GAUGE ASSEMBLV ∣⋅⊺ ∈∏∥−−−−−↿∶ ∣⋅⊺ GRN GRYIWHÏ C425 III SHIFT POSITION fl CONSOLE SWITCH C161 спи PNK PNK ELK CLUTCH SWITCH G401 WNT/GRN VEL/Wł” EGR VALVE GRN/WH`. LIFT SENSOR C159 0475 BLU/RED—[ (3166 BLUIFIED ⋎⋮⊔⋁⋁∥⊺ ACCEL PEDAL ANGLE SENSOR GHNIWHT став cm YEL VEL—4 BLU/VEL ⊟⊔∥⋁≡⇂−⊣ c159 0475 FRONT BLU BLU VALVE TIMING GRNIWRT OIL PRESSURE SWITCH c122 REAR BLUIBLK eLUIRLK VALVE TIMING GRN/WHI DIL PRESSURE SWITCH F c459 C158 спв ∣ GRNIWHT SERVICE CHECK BLU −−−−−⋅−⊣ |-———— BLU CONNECTOR c159 cm cm cm c227 RED/BLU—[I———HED/BLU REDIBlU——I MC CLUTCH RELAY C228 CIso c471 ⊟⇂⋃∣∏⊑⊔−⊣⊢−⊡⇂⊔∕∏⋮∐ ELU/RED-I nfgmggw C161 C478 C473 C249 C315 REDIGRN—————B—_HED/GHN—ÜI— RED/GRN МС PRESSURE гвьк SWITCH G302 11-12 (To page 11-14) (cont'd) Main Menu Table of Contents .o'o СМ]? С524 BLKIYEL—[I— BLKIYEL—[ IG COIL FUSE (30M C400 0523 VELIBLU VELIBLU—-[ ACG (S) FUSE (20A) C481 MAIN RELAY H 016‘ C478 YELIBLK ELK/VEL BLK/VEL - _I “W” -- “W“ GRN/ELK GRNIBLK C160 C471 BLK/YEL ELK BLK C482 ∙ C491 FUEL PUMP RELAY l ELK/VEL ELK/RED BLKIRED ï] RED C161 спв VE'- 0152 ELK/VEL Fu _ BLKIHED −∎∎ RE Е U SIS 0 C479 C771 C773 ELK/RED: ELKIRED FUEL ii BLK ELK PW" RED ∣ − C161 ons G403 ∟ mmm-E cans вышки—1] No.2 FUSE (st) €404 BLKIVEL No.7 FUSE (7,5А] YEL No.5 FUSE (10AI YEL No.5 FUSE (10A) GAUGE ASSEMBLY BLU I. C161 C478 BLU (To page 11-14) (conl'd) 11—13 System Description Electrical Connections (cont'd) (From page 11-13) Main Menu Table of Contents System Description Electrical Connections (cont'd) (From page 11—13) FJ" I 0149 VEL/ELK INJECTOR RESISTOR RED/ELK A1 BRN Nn.1 INJECTOH C135 RED/ELK A3 — RED No.2 INJECTOR C136 HEB/ELK nas INJECTOH A51—ORN C137 RED/ELK AZ—WHTIELU No.4 INJECTOR C138 шиш А 4 ∟ ELK/RED мм INJECTOR C139 RED/DLK AGI_ уы—_—_______Т_' мм INJECTOR 0521 ELK/VEL мы FUSE (st; ELK/VEL No.2 FUSE (15A) c532 CONTROL BOX C160 C471 0500 C527 RED RED RED/BLU RED/BLU GRN GRN C161 C478 C468 CZH ⋁⇃∥⊺∣⋁⋮∟−−−∣∶⊦−∙∙∙⋁∨∦⊺∕⋁⋮⇂⊣ EGR CONTROL SOLENOID VALVE A11 CHAMBE VOLUME R CONTROL SOLENOID VALVE АН RED/BLU PURGE CUT~OFF A20 SDLENOiD VALVE WHTIYEL—l: CLOCK FUSE (7 5A) 11-14 Main Menu Table of Contents BLU PNK WHTIGHN WHTIHED BLU WHTIBLK GRY GRN/VEL WHTIRED C161 CHE I 0160 (3471 0158 C476 C160 C471 ORN/RED—_—{ C158 C476 RED/WHT PNK BLU REDIYEL YELIHED 0494 HEDIYEL BLU ORNIRED WHY/DLK GRY C493 GRNIVEL WHTIHED BLU ELK—fl; G101 11-15

Attachments

ed84691c99f48e5b5a23cede48e4bcc269180019ca81ab3fb38f388b022102cf

nsxe11097a.pdf

Fuel Filter
Replacement
Do not smoke while working on fuel
system. Keep open flame away from work area.
The filter should be replaced: every 4 years or 60,000
miles (96,000 km), whichever comes first or whenever
the fuel pressure drops below the specified value
(323–363 kPa,3.30–3.70 kg/cm2,46–53 psi with
the pressure regulator vacuum hose disconnected) after
making sure that the fuel pump and the pressure
regulator are OK.
1. Place a shop towel under and around the fuel filter.
2. Relieve fuel pressure (page 11-87).
3. Remove the 12 mm banjo bolt and the fuel feed
pipe from the filter.
4. Remove the fuel filter clamp and fuel filter.
5. When assembling, use new washers, as shown.
WASHER
Replace
WASHER
Replace
10 N·m(1.0 kg-m, 7 Ib-ft)
SERVICE BOLT
12 N·m (1.2 kg.m, 9 Ib-ft)
BANJO BOLT
28 N·m (2.8 kg-m, 20 Ib-ft)
WASHER
Replace
28 N·m
(2.8 kg-m,
20 Ib-ft)

Attachments

9fc40bf5989ede35575ce9809a930cdef0ae8df5e584e2dc16e93cf235e552b2

nsxb11123a.pdf

Neutral Switch Signal (M/T)
This signals the ECM when the transmission is in neutral.
Inspection of neutral switch signal.
Check for an open in the circuit:
1. Turn the ignition switch ON (II).
2. Measure voltage between ECM
connector terminals B4 and
A26.
Is there voltage?
Check for a short in the circuit:
1. Shift transmission into gear.
2. Measure voltage between ECM
connector terminals B4 and
A26.
Is there approx. 5 V?
Neutral switch signal is OK.
ECM CONNECTORS
Check for an open in the wire:
1. Turn the ignition switch OFF.
2. Disconnect the 3P connector
from the neutral switch.
3. Connect neutral switch con-
nector terminals No. 1 to No. 3.
4. Turn the ignition switch ON (II).
5. Measure voltage between ECM
connector terminals B4 and
A26.
WIRE SIDE OF FEMALE TERMINALS
WIRE SIDE OF FEMALE TERMINALS
Is there voltage? Replace the neutral switch (seesection 13).
Repair open in the wire
between the ECM (B4) and
the neutral switch.
Repair open in BLK wire
between the neutral switch
and G101 (located at right mid-
dle of engine).
Check for a short in the wire:
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor B (16P) from the ECM.
3. Disconnect the 3P connector
from the neutral switch.
4. Check for continuity between
ECM connector terminal B4
and body ground.
Is there continuity?
Repair short in the wire between
the ECM (B4) and the neutral
switch.
Replace neutral switch (see
section 13).
Substitute a known-good ECM
and recheck. If prescribed volt-
age is now available, replace
the original ECM.
NEUTRAL SWITCH 3P CONNECTOR

Attachments

3e25b6e24d5ae9779c51d7b6abbf48be936de166015740e2f17ed805c8dc32f8

nsxe11003a.pdf

Component Locations
Index
FRONT KNOCK SENSOR
Troubleshooting, page 11-62
COOLANT TEMPERATURE
(TW) SENSOR
Troubleshooting, page 11 – 48
EGR VALVE
Troubleshooting,
page 11-128
FUEL PUMP RESISTOR
Inspection, page 11-106
CRANK/CYL SENSOR
Troubleshooting, page 11-46
CONTROL BOX
page 11-6
THROTTLE
ANGLE
SENSOR
Troubleshooting,
page 11-50
FAST IDLE VALVE
Inspection, page 11-83
EACV
Troubleshooting,
page 11-70
INJECTOR
RESISTOR
Testing, page 11-94
FRONT HEATED
OXYGEN (O2) SENSOR
Troubleshooting, page 11-32
INTAKE AIR TEMPERATURE
(TA) SENSOR
Troubleshooting, page 11-52
REAR KNOCK SENSOR
Troubleshooting, page 11 -62
REAR HEATED
OXYGEN (O2) SENSOR
Troubleshooting, page 11 -32
MAIN RELAY
Relay Testing, page 11-104
Inspection, page 11-105
ELECTRONIC CONTROL UNIT (ECU)
Troubleshooting, page 11-26
FUEL PUMP RELAY
Inspection, page 11-99

Component Locations
Index
THROTTLE CABLE
Inspection/Adjustment, page 11-113
Installation, page 11-113THROTTLE BODY
Inspection, page 11-114
Disassembly, page 11-116AIR CLEANER
Disassembly,
page 11-112
AIR INTAKE
DUCT
FUEL PUMP
Troubleshooting, page 11-99
Testing, page 11-102
Replacement, page 11-102
FUEL FEED PIPE
FUEL CUT VALVES
FUEL FILTER
Replacement, page 11-97
PRESSURE REGULATOR
Testing, page 11-95
Replacement, page 11-96
TWO-WAY VALVE
Testing, page 11-140
FUEL RETURN PIPEFUEL FILLER CAP
CHARCOAL CANISTER
Troubleshooting, page 11-137
FUEL INJECTORS
Troubleshooting,
page 11-89
Replacement, page 11-92
FUEL PIPEFUEL TANK
Replacement,
page 11-108
FUEL VAPOR HOSE

Attachments

b3000a1d188f8be4aed16f0209e1e3bfd380c00a9724153ff2a7de58b79bb108

nsxd11098a.pdf

Idle Control System
Troubleshooting Flowchart Clutch Switch Signal (M/T)
This signals the ECM when the clutch is engaged.
Inspection of clutch switch
signal.
Connect the test harness be-
tween the ECM and connectors
(see page 11-37).
Turn the ignition switch ON.
Measure voltage between C7 (+)
terminal and A26 (-) terminal.
Is voltage less than 1.0 V?
Depress the clutch pedal.
Measure voltage between C7 (+)
terminal and A26 (-) terminal.
(To page 11-99)
Turn the ignition switch OFF.
Disconnect the 3P connector
from the clutch switch.
Check for continuity between
the A terminal and C terminal on
the clutch switch.
Does continuity exist?
Turn the ignition switch ON.
Measure voltage between PNK
(+) terminal and body ground.
Is there approx. 10 V?
Repair open in BLK wire be-
tween the clutch switch and
G401 (located behind left kick
panel).
Replace the clutch
switch.
Repair open in PNK
wire between ECM
(C7) and the clutch
switch.

(From page 11-98)
Is there approx. 10 V?
Clutch switch signal is OK.
Turn the ignition switch OFF.
Disconnect the 3P connector
from the clutch switch.
Turn the ignition switch ON.
Measure voltage between C7 (+)
terminal and A26 (-) terminal
with the clutch pedal depressed.
Is there approx. 10 V?
Turn the ignition switch OFF.
Disconnect “C” connector from
engine wire harness only, not the
ECM.
Turn the ignition switch ON.
Is there approx. 10 V?
Substitute a known-good ECM
and recheck. If prescribed
voltage is now available, replace
the original ECM.
Replace the clutch
switch.
Repair short in PNK
wire between ECM
(C7) and the clutch
switch.

Attachments

830de8cdee797c3f4100ce2207f5d877969f93932c4a28a5ee30a4e792951f2b

nsxb11154a.pdf

Intake Air System
Intake Air Bypass (IAB) Control System
Description
Satisfactory power performance is achieved by closing and opening the intake air bypass (IAB) control valves. High torque
at low engine speed is achieved when the valves are closed, whereas high power at high engine speed is achieved when
the valves are opened.
INTAKE AIR BYPASS (IAB) CONTROL
SOLENOID VALVE ON
ENGINE SPEED IS ABOVE 4,800 rpm
OPEN: HIGH ENGINE SPEED
IAB CONTROL
SOLENOID
VALVE To No. 5 BACK-UP LIGHTS
ALTERNATOR TURN SIGNALS
(15 A) FUSE
IAB
CONTROL
DIAPHRAGM
IAB
CONTROL
VALVE
CLOSED: LOW ENGINE SPEED

Attachments

ccf3ac6ac478c8b8d2add7f938079b5de6d094dbc9acef72c7ce4d8cb2fef614

nsxd11100a.pdf

Idle Control System
Troubleshooting Flowchart
This signals the ECM when the engine is cranking.
Inspection of starter switch
signal.
Connect the test harness be-
tween the ECM and connectors
(see page 11-37).
Measure voltage between C11
(+) terminal and A26 (-) terminal
with the ignition switch in the
start position.
Is there battery voltage ?
Starter switch signal is OK.
NOTE:
M/T: Clutch pedal must be depressed.
A/T: in or range.
Inspect No. 7 (7.5 A) fuse in the
under-dash fuse box.
Is the fuse OK?
Repair open in BLK/WHT wire
between ECM (C11) and No. 7
fuse.
Replace the fuse.
Starter Switch Signal
BATTERY
VOLTAGE?

Attachments

3d5dbab7cdeeae62e6fdfbe5082959e41204ba8142e64e96bb1558ce013f642c

nsxd11135a.pdf

Testing
1. Check the vacuum line for leaks, blockage or a
disconnected hose.
2. Disconnect the vacuum hose from the throttle
valve dashpot control diaphragm, and connect a
vacuum pump to the hose.
THROTTLE
VALVE
DASHPOT
CONTROL
DIAPHRAGM
4. Connect a vacuum pump to the throttle valve
dashpot control diaphragm.
5. Apply vacuum and check that the rod pulls in and
vacuum holds.
3. Apply vacuum and check the speed the vacuum
goes out.
Vacuum should go out slowly.
VACUUM PUMP/GAUGE
A973X–041–XXXXX
THROTTLE
VALVE
DASHPOT
CHECK VALVE
If the vacuum holds or goes out quickly, replace
the throttle valve dashpot check valve and
retest.
If the vacuum does not hold or the rod does not
move, replace the throttle valve dashpot control
diaphragm and retest.

Attachments

1e50fba1fd3a283dd1b277f6570a5aed3095c83ee84d5a32e733cd2a285b6217

nsxe11095a.pdf

Pressure Regulator
Description
The fuel pressure regulator maintains a constant fuel
pressure to the injectors. When the difference between
the fuel pressure and manifold pressure exceeds 3.5
kg/cm2 (50 psi), the diaphragm is pushed upward, and
the excess fuel is fed back into the fuel tank through the
return line.
CLOSE
Testing
Do not smoke during the test. Keep
open flames away from your work area.
1. Attach a pressure gauge to the service port of the
fuel filter (page 11-88).
Pressure should be:
323-363 kpa (3.30-3.70 kg/cm2. 46-53 psi)
(with the regulator vacuum hose disconnected)
PRESSURE FUEL PRESSURE GAUGE
REGULATOR 07406-0040001
INTAKE MANIFOLD
VACUUM
DIAPHRAGM
FUEL
INLET
2. Reconnect the vacuum hose to the pressure
regulator.
OPEN
INTAKE MANIFOLD
VACUUM
DIAPHRAGM
FUEL
INLET
(cont’d)

Fuel Supply System
Pressure Regulator (cont’d)
3. Check that the fuel pressure rises when the vacuum
hose from the regulator is disconnected again.
If the fuel pressure did not rise, check to see if it
rises with the fuel return hose lightly pinched.
If the fuel pressure still does not rise, replace the
pressure regulator.
Replacement
Do not smoke while working on fuel sys-
tem . Keep open flame away from work area.
1. Place a shop towel under pressure regulator, then
relieve fuel pressure (page 11-87).
2. Disconnect the vacuum hose and fuel return hose.
3. Remove the two 6 mm retainer bolts.
O-RING
Replace.
PRESSURE REGULATOR
RETURN HOSE SHOP TOWEL
NOTE:
Replace the O-ring.
When assembling the regulator, apply clean engine
oil to the O-ring and assemble it into its proper
position, taking care not to damage the O-ring.

Attachments

e981678ad72ab7d21fe633a07c8047ca70bbec3704a51183de7dc80680c6e4d6

nsxe11072a.pdf

Idle Control System
Troubleshooting Flowchart Air Conditioning Signal
This signals the PGM-FI ECU when there is a demand for cooling from the air conditioning system.
Inspection of Air Condition-
ing Signal.
Connect the ECU test harness
between the ECU and connector.
Disconnect “C” connector from
the engine wire harness only, not
the ECU (page 11-21).
Turn the ignition switch ON.
Measure voltage between C3 (+)
terminal and A26 (-) terminal.
Is there approx. 10 V?
Substitute a known-
good ECU and re-
check. If prescribed
voltage is now avail-
able, replace the ori-
ginal ECU.
C3
A26
10 V
Turn the ignition switch OFF.
Reconnect “C” connector to the
engine wire harness.
Turn the ignition switch ON.
Momentarily connect A15 ter-
minal to A26 terminal several
times.
Is there a clicking noise from the
A/C compressor clutch?
Connect the RED/BLU terminal of
the 4P connector on the A/C
clutch relay to body ground.
RED/BLU
A 15
Short
A26
View from UNDER-HOOD
FUSE/RELAY BOX side
Start the engine.
Is there a clicking noise from the
A/C compressor clutch?
See air conditioner in-
spection (section 22).
Repair open in RED/BLU wire be-
tween ECU (A15) and A/C clutch
relay.
Blower switch ON.
(To page 11-73)

(From page 11-72)
Less than 1 V
C3
A26
A/C switch ON.
Does A/C operate ?
Air conditioning signal is OK.
Is voltage less than 1V?
Measure voltage between C3
( + ) terminal and A26 (-) ter-
minal.
Repair open in BLU/
BLK wire between ECU
(B5) and A/C switch.
Substitute a known-good ECU
and recheck. If symptom/indica-
tion goes away, replace the orig-
inal ECU.

Attachments