fuel cap ISUZU TROOPER 1995 Owner's Manual

---
DRIVEABILITV AND EMISSIONS 6E2-3
ALL NEW ISUZU VEHICLES ARE CERTIFIED BY THE UNITED STATES ENVIRONMENTAL PROTECTION
AGENCY AS CONFORMING TO THE REQUIREMENTS OF THE REGULATIONS FOR THE CONTROL OF AIR
POLLUTION FROM NEW MOTOR VEHICLES. THIS CERTIFICATION IS CONTINGENT ON CERTAIN
ADJUSTMENTS BEING SET TO FACTORY STANDARDS. IN MOST CASES, THESE ADJUSTMENT POINTS
EITHER HAVE BEEN PERMANENTLY SEALED AND/OR MADE INACCESSIBLE TO PREVENT INDISCRIMINATE
OR ROUTINE ADJUSTMENT IN THE FIELD. FOR THIS REASON, THE FACTORY PROCEDURE FOR
TEMPORARILY REMOVING PLUGS, CAPS, ETC., FOR PURPOSES OF SERVICING THE PRODUCT, MUST BE
STRICTLY FOLLOWED AND, WHEREVER PRACTICABLE, RETURNED TO THE ORIGINAL INTENT OF THE
DESIGN.
GENERAL INFORMATION
DRIVEABILITY
The driveability diagnosis procedures apply to various
systems in current
ISUZU vehicles. The procedures
assume
that the vehicle is worked on properly at one
time and the
problem is due to time, wear, dirt or other
causes.
Start with the introduction that follows. This
will describe a systematic diagnostic procedure.
Any system disconnected during diagnosis should be
reconnected. This
includes wires, hoses, linkage, etc.
EMISSIONS
The exhaust emission control systems used on
ISUZU engines perform a specific function to lower
exhaust emissions while maintaining good fuel
economy and driveability.
MAINTENANCE SCHEDULE
Refer to the Maintenance Schedule in Section "OB"
General Information for the maintenance service that
should be performed to retain emission control
performance.
INTRODUCTION
ELECTRONIC ENGINE CONTROL
All engines have an Engine Control Module (ECM)
to control the fuel system. The ECM varies the air/
fuel ratio by controlling the fuel flow through the
injectors.
In addition, the ECM controls the ignition timing,
fuel pump, and various other systems.
It is important to review the component sections
and
wiring diagrams in this Section for specific
components
controlled by the ECM and what
systems are non-ECM controlled.
WHAT THIS SECTION CONTAINS
Each ISUZU engine has system controls to reduce
exhaust emissions
while maintaining good
driveability and fuel economy. •
This Section explains:
•
How to use the Driveability and Emission
Section
"6E2" engines.
• A brief description of systems used to
control fuel and emissions.
• Abbreviations that are used in Driveability
and Emissions.
• Special tools used to diagnosis and repair a
system.
Before checking the
system, adhere to the
following information:
BLOCKING DRIVE WHEELS
The vehicle drive wheels should always be
blocked, and parking brake firmly set, while
checking the system.
VISUAL/PHYSICAL UNDERHOOD
INSPECTION
A careful visual and physical underhood
inspection must
be performed as part of any
diagnostic procedure
or in finding the cause of an
emissions test failure. This can often lead to fixing
a
problem without further steps. Inspect all
vacuum hoses for correct routing, pinches, cuts,
or disconnections. Be sure to inspect hoses that
are
difficult to see beneath the throttle body and
common chamber.
Inspect all the wires in the
engine
compartment for correct and good
connections, burned or chaffed spots, pinched
wires, or contact with sharp edges or hot exhaust
manifolds. This visual/physical inspection is very
important. It must be done carefully and
thoroughly.

DRIVEABILITY AND EMISSIONS 6E2-11
Former ISUZU Name New ISUZU Name Term
Throttle Position Switch Wide Open Throttle Switch -WOT Switch
Throttle Switch
Wide Open Throttle Switch -WOT Switch
Throttle Valve Throttle
Body -TB
TPS Throttle Position Sensor -TP Sensor
Transmission ECU Transmission Control Module -TCM
TWC Three
Way
Catalytic Converter -TWC
Vacuum Switching Valve Vacuum Switch Valve -VSV
Vehicle Speed Sensor Vehicle
Speed Sensor
-VSS
vss Vehicle Speed Sensor -VSS
vsv Vacuum Switch Valve -VSV
WOT
Wide Open Throttle -WOT
ABBREVIATIONS AND GLOSSARY OF TERMS
Abbreviations used in this section are listed below in
alphabetical order with an explanation of the
abbreviation. There are some variations in the use
of
periods and in capitalization (as mph, m.p.h., Mph, and
MPH) for abbreviations used in this Section, but all
types are acceptable.
A/T -AUTOMATIC TRANSMISSION
AVM-ANALOG VOLT METER
CKT -CIRCUIT
DOHC-DUAL OVERHEAD CAMSHAFTS
DTM-DIAGNOSTIC TEST MODE
A particular state of operation.
DVOM-DIGITAL VOLT OHM METER
ECT -ENGINE COOLANT TEMPERATURE
ECM-ENGINE CONTROL MODULE
A metal box (located in passenger compartment)
containing
electronic circuitry which electrically
controls
and monitors air/fuel and emission systems
on
computer command control, and turns "ON" the
"Check Engine"
Malfunction Indicator Lamp when a
malfunction occurs in the system.
EGR-EXHAUST GAS RECIRCULATION
Method of reducing NOx emission levels by causing
exhaust gas
to be added to air/fuel mixture in
combustion chamber, thus
cooling combustion.
FED-FEDERAL
Vehicle/Engine available in all states except California.
GROUND
The negative (-) side of the battery. Also could be a
wire (conductor) shorted to ground.
HC-HVDROCARBONS
One of the pollutants found in engine exhaust.
Hg-MERCURV
A calibration material used as a standard for vacuum
measurement.
HIGH IMPEDANCE VOLTMETER
Has high opposition to the flow of electrical current.
Good
for reading circuits with low currentflow, such as
found in electronic systems because it allows tests to
be made without affecting the circuit.
IAT -INTAKE AIR TEMPERATURE
Air temperature in the intake manifold.
IAT-INTAKE AIR TEMPERATURE SENSOR
Measures the underhood temperature.
IC-IGNITION CONTROL
ECM controlled spark timing
IDEAL MIXTURE
The air/fuel ratio which provides the best
performance,
while maintaining maximum conversion
of exhaust emissions. Typically it is 14.7:1.
IGN-IGNITION
INPUTS
Information from sources (such as Engine Coolant
Temperature Sensors, Oxygen Sensor, etc.) to the
ECM that indicate how the systems are performing.
INTERMITTENT
Occurs now and then; not continuously. In electrical
circuits, refers to occasional open, short, or ground.
liP-INSTRUMENT PANEL
ISC-IDLE SPEED CONTROL
ECM-controlled solenoid used to route vacuum to
control idle speed under various engine loads.
KM/H-KILOMETER PER HOUR
A metric unit measuring speed needed to travel
distance of one kilometer (1 000 meters) in one hour.

6E2-12 DRIVEABILITY AND EMISSIONS
L-LITER
A metric unit of capacity.
MALFUNCTION
A problem that causes the system to operate
incorrectly. Typical malfunctions are wiring harness
opens
or shorts, failed sensors or circuit components.
MAP-MANIFOLD ABSOLUTE PRESSURE
Air pressure in the intake manifold with reference to
zero or absolute vacuum.
MPH-MILE PER HOUR
A unit measuring speed needed to travel distance of
one mile (5280 feet) in one hour.
MIT -MANUAL TRANSMISSION
N.C.-NORMALLY CLOSED
State of relay contacts or solenoid plunger is close
when voltage is not applied.
N·m-NEWTON METER (Torque)
A metric unit describing force.
N.M.-NORMALLY OPEN
State of relay contacts or solenoid plung&r' is open
when voltage is applied.
NOx-NITROGEN OXIDES
One of the pullutants found in engirie exhaust.
02-0XYGEN (Sensor)
Monitors the oxygen contel)f of the exhaust system
and generates a
voltage signal to the Engine Control
Module (ECM).
OUTPUT
Result of a functi typically controlled by the ECM.
OXYGEN SE OR
Device that etects the amount of oxygen (02) in the
exhaust
stfeam. /
PCV-~OSITIVE CRANKCASE VENTILATION
Prey£nt fumes in crankcase from passing into
atmosphere.
PNP-PARK/NEUTRAL POSITION
PORT-EXHAUST OR INTAKE PORT
PWM-PULSE WIDTH MODULATE
RPM-REVOLUTION PER MINUTE
A measure of rotational speed.
SELF-DIAGNOSTIC TROl)SLE CODE
The ECM can detect malfunctions in the system. If a
malfunction occurs, the ECM turns on the malfunction
indicator lamp. A OTC can be obtained from the ECM
through the malfunction indicator lamp. This DTC will
indicate the area of the malfunction.
TACH-TACHOMETER
TB-THROTTLE BODY
TBI-THROTTLE BODY FUEL INJECTION
Computer Command Control using throttle body fuel
injection
TP SENSOR-THROTTLE POSITION SENSOR
VACUUM
Negative pressure; less than atmospheric pressure.
VIN-VEHICLE IDENTIFICATION NUMBER
VSS-VEHICLE SPEED SENSOR
Sensor which sends vehicle speed information to the
ECM.
VSV-VACUUM SWITCH VALVE
(Electronically Controlled)
VSV-VACUUM SWITCH VALVE
Temperature controlled vacuum switch, that is used to
route or exhaust vacuum at various engine
temperatures.
WOT -WIDE OPEN THROTTLE
DRIVEABILITV AND EMISSION SECTION SUMMARY
The Driveability and Emissions Sections are sub­
divided into three sub sections:
SECTION A: CIRCUIT INFORMATION &
DIAGNOSIS
• Component Locations
• Wiring Diagrams
• ECM Terminal End View and Terminal
Definitions
• On-Board Diagnostic System Check. This
must be the first step of any diagnostic
procedure.
• DTC Charts with facing pages containing
circuit diagrams, circuit operation
information, and
helpful diagnostic
information.
SECTION B: DRIVEABILITY & EMISSIONS
SYMPTONS
• This sub-section assists in diagnosis of
intermittent problems or problems which
don't result in the storing of DTC(s). It is
arranged
by symptoms of poor driveability
and emissions and lists possible causes of
the problems.
SECTION C: COMPONENT CHECKS &
SERVICE
• Component and Circuit Descriptions
• On-Vehicle Service
• Functional
Checks/Diagnostic Charts
•

6E2-36 DRIVEABILITV AND EMISSIONS
ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
The on-board diagnostic system check is an organized approach to identifying a problem created by an Electronic
Engine
Control System malfunction. It must be the starting point for any driveability complaint diagnosis, because
it directs the service technician to the next logical step in diagnosing the complaint. Understanding the chart and
using
it correclty will reduce diagnostic time and prevent the unnecessary replacement of good parts.
Test Description:
Number(s) below refer to circled number(s) on the following diagnostic chart.
CD This check is to see if the Engine Control Module (ECM) can provide a ground path for the "Check Engine"
malfunction indicator lamp, this is a bulb check. If it can do this, it confirms that the ECM has power, ground
and is capable
of some functions. If the malfunction indicator lamp is "OFF", Chart A-1 will check for both
ignition feed and constant battery power to the
ECM and the ECM grounds.
® This check is done to see if the ECM has the capability of performing internal diagnostics. Diagnostic trouble
code
12 means there is no crankshaft position coming to the ECM, this is normal because the engine is not
running.
® This check is used to see if the ECM can supply serial data for Tech 1 "Scan tool" use.
@ Look at all the parameters to determine if on is not in a normal state with just the ignition "ON" and engine
"OFF". In particular, look at the barometric pressure reading from the MAP sensor voltage and kPa values.
Are they normal for
your altitude? If not, use Chart C1-D. Look at the Engine Coolant Temperature (ECT)
Sensor value to see if the value is shifted above or below where it should be. If so, see diagnostic aid chart on
Diagnostic Trouble
Code 14 chart.
@ This test is used to see if the cause of a "No-Start" is because of an ECM problem or the vehicle electrical
system.
® This check is to see ifthe ECM has any diagnostic codes stored in it memory to aid in diagnosing the customer
complaint.
TO FUEL
PUMP
RELAY 15A
,------------+--RED/WHT Engine
Control Module(ECM)
BATTERY
VOLTAGE INPUT
ECM FUSIBLE L_ __ RED/WHT
~~TTERY LINK 30A ~
VOLTAGE ..,.,.f----BLK/RED
TO
~t-----tr-RED/WHT -----,t--+---.-RED/GRN
IGNITION BLK/YEL J-------BLK/YEL -TCM BLK
SWITCH
TO EGR VALVE VSV
CANISTER PURGE VSV SECONDARYINTAKEVSV REED VALVE VSV
TO FUEL (C91-C8)
INJECTORS RED/GRN
TO KS MODULE ..,._ ___ RED/GRN
LOCATED
PASSENGER
SIDE
FENDER CHASSIS
GROUND
"CHECK ENGINE" MALFUNCTION
I/P CONNECTOR INDICATOR LAMP
METER (BLUE)
f'7:' TO ..,._ __ BLK/YEL ~~VEL~(;-VLT IGNITION
SWITCH 7.5A
SPLICES TO
ECM TERM. "D1" ECM SYSTEM
GROUND
DATA LINK CONNECTOR(WHITE)
Fig. 6E2-23a
1/P CONNECTOR
(WHITE)
BATTERY VOLTAGE INPUT
IGNITION
VOLTAGE INPUT
"CHECK ENGINE"
MALFUNCTION
INDICATOR
LAMP DRIVER
-=:J._
DIAGNOSTIC
REQUEST INPUT
•

DRIVEABILITV AND EMISSIONS 6E2-49
CHART A-5
FUEL PUMP RELAY CIRCUIT
• REMOVE FILL CAP. • IGNITION "ON", ENGINE STOPPED.
• LISTEN FOR PUMP TO RUN AT FILLER NECK. • PUMP SHOULD RUN FOR 2 SECONDS, THEN SHUT "OFF". DOES IT?
I
CD
$ $
• REMOVE RELAY FROM UNDERHOOD RELAY CENTER. INTERMITTENT PROBLEM. SEE I • WITH TEST LIGHT TO GROUND, PROBE RED/WHT "DIAGNOSTIC AIDS" ON FACING~. WIRE CAVITY OF FUEL PUMP RELAY CONNECTOR.
• LIGHT SHOULD BE "ON". IS IT?
I
$
$
• JUMPER RED/WHT WIRE AND BLK/RED WIRE WITH A OPEN IN RED/WHT WIRE CIRCUIT. I FUSED JUMPER. • LISTEN FOR FUEL PUMP TO RUN. DOES IT?
I
$ $
• IGNITION "OFF" FOR 10 SECONDS. • JUMPER WIRE STILL IN PLACE. ® • CONNECT TEST LIGHT BETWEEN BLK WIRE AND • PROBE FUEL PUMP CONNECTOR AT FUEL
PNK/WHT WIRE OF FUEL PUMP RELAY CONNECTOR. TANK WITH TEST LIGHT TO GROUND. • IGNITION "ON", LIGHT SHOULD BE "ON" FOR 2 • LIGHT SHOULD BE "ON". SECONDS, THEN SHUT "OFF". IS IT? IS IT?
I
$
$ ~ $
• IGNITION "OFF" FOR 10 SECONDS. I FAULTY RELAY I OPEN IN GROUND TO I OPEN IN BLK/RED WIRE I • BACK PROBE TERMINAL "C3" OF FUEL PUMP ENGINE CONTROL MODULE (ECM) OR WITH TEST LIGHT TO GROUND. FAULTY FUEL PUMP • IGNITION "ON". • LIGHT SHOULD BE "ON" FOR 2 SECONDS.
IS IT?
I
$ $
OPEN IN PNK/WHT WIRE FAULTY ENGINE OR CONTROL MODULE
OPEN IN BLK WIRE (ECM)

DRIVEABILITY AND EMISSIONS 6E2-55
CHART A-7
(Page 3 of 3)
FUEL SYSTEM PRESSURE TEST
Tools Required: J34730-1 FUEL PRESSURE GAUGE
CAUTION: TO REDUCE THE RISK OF FIRE AND PERSONAL INJURY:
• IT
IS NECESSARY TO RELIEVE FUEL SYSTEM PRESSURE BEFORE CONNECTING A FUEL
PRESSURE GAUGE.
• A SMALL AMOUNT OF FUEL MAY BE RELEASED WHEN DISCONNECTING THE FUEL LINES.
COVER FUEL l-INE FITTINGS WITH A SHOP TOWEL BEFORE DISCONNECTING, TO CATCH ANY
FUEL THATMAYLEAKOUT. PLACETOWELINAPPROVEDCONTAINERWHENDISCONNECTIS
COMPLETED.
FUEL PRESSURE
RELIEF PROCEDURE
1. REMOVE FUEL CAP.
2. REMOVE FUEL PUMP RELAY FROM UNDERHOOD RELAY CENTER.
3. START
ENGINE AND ALLOW TO STALL.
4. CRANK ENGINE FOR ADDITIONAL 30 SECONDS.
5. REMOVE NEGATIVE BATTERY CABLE.
FUEL GAUGE ADAPTER
INSTALLATION
1. REMOVE SHOULDER FITTING CAP.
2. INSTALL FUEL GAUGE J34730-1 TO FUEL RAIL
3. REINSTALL FUEL PUMP RELAY.
4. CONNECT NEGATIVE BATTERY CABLE.
5. IF YOU ARE WORKING ON A DOHC, IT WILL BE NECESSARY TO INSTALL THE INTAKE MANIFOLD RUN
PLATE.
REFER TO SECTION C2 FUEL METERING SYSTEM FOR INTAKE REMOVAL.
REFER TO INTAKE MANIFOLD DIAGNOSTIC PLATE FOR INSTALLATION INSTRUCTIONS, AS WILL AS
CHART A-8 OF THIS SECTION.

6E2-96 DRIVEABILITY AND EMISSIONS
EXCESSIVE EXHAUST EMISSIONS OR ODORS
Definition: Vehicle fails an emission test. Vehicle has
excessive
"rotten egg" smell. Excessive
odors
do not necessarily indicate
excessive emissions.
PRELIMINARY CHECKS
• Perform on-board diagnostic system check.
• IF EMISSION TEST shows excessive CO and
hydrocarbon check items which cause car to run
RICH (Long Term Fuel Trim less than 118), refer to
"Diagnostic Aids" on facing page of diagnostic
trouble code (DTC) 45.
• If EMISSION TEST shows excessive NOx, check
items which cause car
to run lean or too hot.
COOLING SYSTEM
• If the "Scan tool" indicates a very high engine
coolant temperature and the system is running
lean:
CHECK: Engine coolant level
CHECK: Engine thermostat for faulty part
(always open) or for wrong heat range. Refer
to
ENGINE COOLING (SECTION 68).
CHECK: Cooling fan operation.
FUEL SYSTEM
• NOTICE: If the system is running rich (L.T. Fuel
Trim near 118), refer to "Diagnostic Aids"
on facing page
of DTC 45.
-
If the system is running lean (L.T. Fuel
Trim near 142) refer to "Diagnostic
Aids" on facing page of DTC 44.
• CHECK: For properly installed fuel cap.
• CHECK: Fuel pressure. Use CHART A-7.
• CHECK: Canister for fuel loading. Refer to
"Evaporative Emission Control System,"
Section
"6E2-C3."
IGNITION SYSTEM
• CHECK: Ignition timing. Refer to "Vehicle
Emission Control Information" label.
• CHECK: Spark plugs, plug wires, and ignition
components. Refer to
ENGINE
ELECTRICAL (SECTION 6D).
ADDITIONAL CHECKS
• CHECK: For vacuum leaks.
• CHECK: Exhaust gas recirculation valve for not
opening. Use CHART C-7.
• CHECK: For lead contamination of three way
catalytic converter (look for the removal
of fuel filler neck restrictor).
• CHECK: Carbon build-up. Remove carbon with
top engine cleaner. Follow instructions
on can.
• CHECK: PCV valve for being plugged, stuck or
blocked PCV hose or fuel in the
crankcase.
BACKFIRE
Definition: Fuel ignites in intake manifold, or in
exhaust system, making
loud popping
noise.
PRELIMINARY CHECKS
• Perform the careful visual/physical checks as
described at start of "Symptoms," Section "6E2-
B."
IGNITION SYSTEM
• CHECK: Proper ignition coil output voltage with
spark tester J26792 or equivalent (ST-
125).
• CHECK: Spark plugs. Remove spark plugs, check
for
wet plugs, cracks, wear, improper
gap, burned
electrodes, or heavy
deposits. Repair
or replace as necessary.
• CHECK: Spark plug wires for crossfire, also
inspect electronic ignition, spark plug
wires, and proper routing of plug wires.
• CHECK: Ignition timing. Refer to "Vehicle
Emission Control Information" label.
• CHECK: If an intermittent condition exists in the
ignition system, see
"Ignition System/
IGNITION CONTROL," Section "6E2-C4"
or ENGINE ELECTRICAL (SECTION 6D).
ENGINE MECHANICAL
• CHECK: Compression- Look for sticking or leaking
valves.
• CHECK: Valve timing, refer to ENGINE
MECHANICAL DIAGNOSIS (SECTION
6A).
• CHECK: Intake and exhaust manifold passages for
casting
flash.
FUEL SYSTEM
• CHECK: Perform fuel system diagnosis check, see
CHART A-7.

6E2 120 DRIVEABILITY AND EMISSIONS
THROTTLE BODY (TB) ASSEMBLY
The Throttle Body (TB) assembly is attached to the
intake manifold air
plenum, and is used to control air
flow into the engine, thereby controlling engine output
(Fig. 6E2-73). The TB within the TB is opened by the
driver through the accelerator controls. During engine
idle, the
TB is almost closed, and air flow control is
handled by the Idle Air Control (lAC) valve, described
below. To prevent
TB icing during cool weather
operation, engine
coolant is directed through a engine
coolant tube, part
of the TB, the engine coolant then
circulates through internal passageways around the
throttle bore and returns via the return engine coolant
tube.
The
TB also provides the location for mounting the
Throttle Position
Sensor. Vacuum ports the located at,
above or
below the throttle body to generate vacuum
signal needed
by various components.
Idle Air Control (lAC) Valve
Engine idle speed is controlled by the Engine Control
Module (ECM) through the Idle Air Control (lAC) valve
mounted on the
TB. The ECM sends voltage pulses to
the lAC motor windings causing the lAC valve pintle to
move "IN" or "OUT" a given distance (a step or count)
for each pulse. The pintle movement controls the
airflow around the TBs, which in turn, controls engine
idle speed.
• The "controlled" or desired idle speed for all
engine operating conditions is programmed into
the
calibration of the ECM. The programmed
engine speeds are based on engine coolant
temperature, park/neutral position switch status,
vehicle speed, battery positive voltage, and air
conditioning pressure (if equipped).
• The ECM "learns" the proper lAC valve positions to
achieve warm, stabilized idle speeds (revolution
per minute), desired
for the various conditions
(Park/Neutral position
or Drive, air conditioning
"ON" or "OFF", if equipped). This information is
stored in
ECM "Keep Alive" memories
(information
is retained after ignition is "OFF"). All
other lAC valve positioning is calculated based on
these
memory values.
As a
result, engine variations due to wear and
variations in
minimum TB position (within limits)
do not affect engine idle speeds. This system
provides correct idle control under
all conditions.
This also means
that disconnecting power to the
ECM can result in incorrect idle control or
necessity to partially depress the accelerator
pedal
when starting until the ECM relearns idle
control. Refer to note regarding clearing
memory
in "ECM and Sensors," Section "6E2-C1 ".
•
Engine idle speed is a function of total airflow into
the engine based on
lAC valve pintle position plus
TB opening plus calibrated vacuum loss through
accessories.
• The minimum TB position is set at the factory with
a stop screw. This setting allows enough air flow
by the TB to cause the lAC valve pintle to be
positioned a calibrated
number of steps (counts),
from the seat, during "controlled" idle operation.
The
minimum TB position setting on this engine
should not be considered the
"minimum idle
speed", as on other fuel injected engines. The
throttle stop
screw is covered with a plug at the
factory
following adjustment.
U7 CAUTION:
VI Do not attempt to remove the protective cap and
readjust the stop screw before
reviewi~g t~e
"Minimum TB Position Check", later m th1s
section. Misadjustment may result in damage to
the lAC valve or TB.
Fig. 6E2-73
2. Throttle body assembly
3. Throttle position sensor (TPS)
• The ECM normally resets the lAC valve pintle
position once during each ignition cycle,
when
vehicle speed increases above 35 miles per hour
on moderate acceleration. During the reset, the
ECM commands the lAC valve pintle to retract
completely, then move
"IN" to the seated position
(to establish the zero
count position), and then
back
out to the desired position. If, after the reset,
the
ECM is able to control the idle speed within the
calibrated count range, the
lAC valve will not be
reset again until the ignition has been turned
"OFF", the engine restarted and the car then
driven above 35 mile per hour.
If the ECM is not
able to control idle speed within the calibrated
count range after the first reset, the
ECM assumes
the
lAC valve pintle position is "lost", and enables
another reset
to occur. This will continue until the
pintle position is relearned.
• If the lAC valve is suspected as being the cause of
improper idle speed, perform a functional check of
the lAC valve (CHART C-2C) as described later in
this section.
-----------------------------'
•

6E2-122 DRIVEABILITV AND EMISSIONS
INDUCTION AIR CONTROL PLATE
SYSTEM
Refer to CHART C-2D to diagnose the Induction air
control plate system.
ON-VEHICLE SERVICE
FUEL PUMP RELAY
The fuel pump relay is mounted in the engine
compartment.
Other than checking for loose
connectors, the only service possible is replacement.
MUL TIPORT FUEL INJECTION
COMPONENTS
WCAUTION:
VI • To reduce the risk of fire and personal injury, it
is necessary to relieve the fuel system pressure
before servicing
fuel system components.
• After relieving system pressure, a small
amount of fuel may be released when servicing
fuel lines or connections. In order to reduce the
chance
of personal injury, cover fuel line
fittings with a shop towel before disconnecting,
to catch any
fuel that may leak out. Place the
towel in an approved container when
disconnect is completed.
Fuel Pressure Relief Procedure
1. Remove fuel cap.
2. Remove fuel pump relay from underhood relay
box.
3. Start engine and allow to stall.
4. Crank engine for additional 30 seconds.
5. Remove negative battery cable.
FUEL RAIL ASSEMBL V
An eight digit identification number is stamped on the
side
ofthe fuel rail (Fig. 6E2-75). Refer to this number if
servicing or part replacement is required.
Names
of component parts appear in the numbered
list on the disassembled view (Fig. 6E2-75).
'fCAUTION:
• Do not attempt to remove the fuel inlet fitting
on the
fuel rail, it is staked in place. To do so will
result
in damage to the fuel rail or to the internal
0-ring seal.
•
Do care in removing the fuel rail assembly, to
prevent damage to the injector
electrical
connector terminals and the injector spray tips.
• Prevent dirt and other contaminants from
entering open lines and passages. Fittings
should be capped, and holes plugged, during
servicing.
Before
removal, the fuel rail assembly may be
cleaned with a spray type engine cleaner,
following
package instructions. Do not
immerse fuel rails in liquid cleaning solvent.
Fig. 6E2-75
I'
---------------------'
•

CHASSIS ELECTRICAL 8-21
FUSE, FUSIBLE LINK AND CIRCUIT BREAKER LOCATION
ooooo 112~12~1~1~1
00 E
EEr 00 ~
Relay & fuse box
SJOOO 7-6
I lw ;;::;~ Fuse box ~ ~
1l1~~ ~lff~UIH~Inll
w~ F-a FL-4 ~
00 FL·S~ r---, F-11 'l2~J1~ 1~1&11~11~1,\l~31hl1~1
0
0
FL-6 'F-i2
I' ~
\a~ a~;
0000
0000
I ~
l/
~
j
~/~/ e:;?' v II I / / .I / /
('-/ .
~~
-~-~;,a~ ~~ --.:_
~~~~ -
Relay & Fuse box Fuse box
Fuse
Fuse Fuse
No. Capacity Indication on label No. Capacity Indication on label No. Capacity Indication on label
F-1 --C-1 10A STARTER RELAY
C-14 15A STOP A!f CONT
F-2 10A 02 SENSOR HEATER C-2 15A (SEAT HEATER)
C-15 20A (AUDIO [8))
F-3
15A HORN HAZARD C-3 15A
TURN BACK C-16 10A CLOCK (8] ROOM
F-4
15A H/LAMP-LH C-4 10A ELEC.IGN. C-17 25A RR DEFOG
F-5
15A H/LAMP-RH C-5
15A FRTWIPER & C-18 20A (DOOR LOCK)
F-6 --WASHER C-19
25A BLOWER
F-7
- -C-6 10A RRWIPER & C-20 10A (AIR
CON)
F-8
15A (FRT.FOG) WASHER C-21 10A SRS-1
F-9 20A ABS C-7 10A (H/LAMP C-22 10A SRS-2
F-10
15A FUEL PUMP WIPER) C-23 lOA SRS-3
F-11 -
-C-8 15A ENGINE C-24 10A SRS-4
F-12
15A TAIL C-9 15A IGN. COIL CIRCUIT BREAKER
FUSIBLE
LINK
C-10 10A METER GAUGE
C/8-1 --FL-1 80A MAIN C-11 10A
(AUDIO IACC])
C/8-2 30A (P/W, P/S, S/R)
FL-2 50 A KEYSW MIRROR
FL-3 30A ECM C-12 20A CIGARETTE 02: Oxygen
FL-6 40A (ASS 4/WHEEL ONLY) C-13 10A (ANTI THEFT)
Fig. 8-44