Toyota 1RZ Owner's manual

1997 TOYOTAMOTORCORPORATION
All rightsreserved. This CD may not be repro-
duced or copied, in whole or in part, without the
written permission of Toyota Motor Corporation.
First Printing: Aug. 18. 1997 01--970818--00
FOREWORD
ThisSUPPLEMENT has been prepared to provide information covering general servicerepairsfor the
1RZ,1RZ - E,2RZ--FE,3RZ--Fand 3RZ--FEENGINES equipped on the TOYOTAHILUX.
Applicablemodels:RZN142, 144, 147, 148, 149, 154, 168, 169, 173, 174, 193 series
Fortheservicespecificationsandrepairproceduresoftheabovemodelotherthanthoselistedinthissupple-
ment, refer to the following manuals.
Manual Name Pub.No.
S1RZ,2RZ,2RZ--EEngine Repair Manual RM167E
S2RZ,2RZ--EEngine Repair Manual Supplement RM558E
S3RZ--F,3RZ--FEEngine Repair Manual RM521E
S1RZ--E Engine Repair Manual RM467E
S1RZ, 2RZ--E Repair Manual For Emission Control ERM055E
S3RZ--F Repair Manual For Emission Control ERM103E
All information in this manualis based on the latest product information at the time of publication. However,
specifications and procedures are subject to change without notice.
CAUTION
Thismanualdoesnotincludeallthenecessaryitemsaboutrepair andservice.Thismanualismade
for the purpose of the use for the persons who have special techniques and certifications. In the
casesthatnon--specializedoruncertifiedtechniciansperformrepairorserviceonlyusingthismanu-
al or without proper equipment or tool, that may cause severe injury to you or other people around
and also cause damage to your customer’s vehicle.
In order to prevent dangerous operation and damages toyour customer’svehicle, besure to follow
the instruction shown below.
SMustreadthismanualthoroughly.Itisespeciallyimportant tohave goodunderstandingallthe
contents written in the PRECAUTION of ”IN” section.
STheservicemethodwritteninthismanualisveryeffectivetoperformrepairandservice.When
performingtheoperationsfollowingtheproceduresusingthismanual,besuretousetoolsspe-
cified and recommended. If using non--specified or recommended tools and service method,
be sure to confirm safety of the technicians and any possibility of causing personal injury or
damage to the customer’s vehicle before starting the operation.
SIfpartreplacementisnecessary,mustreplacethepartwiththesamepartnumberorequivalent
part. Do not replace it with inferior quality.
SIt is important to note that this manual contains various ”Cautions”and ”Notices” that mustbe
carefullyobserved in orderto reduce the riskof personal injury duringservice or repair, or the
possibilitythatimproper serviceorrepair maydamagethe vehicle orrenderitunsafe. Itisalso
important to understand that these ”Cautions” and ”Notices” are not exhaustive, because it is
important to warn of allthe possible hazardous consequences that might result from failure to
follow these instructions.
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N/A FOR THE HILUX
N/A FOR THE HILUX
N/A FOR THE HILUX
RM584E
TOYOTAMOTOR CORPORATION
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3RZ-F,3RZ-FE

INTRODUCTION
PREPARATION
SERVICE SPECIFICATIONS
DIAGNOSTICS
ENGINE MECHANICAL
EMISSION CONTROL
ELECTRONIC FUEL INJECTION
COOLING
LUBRICATION
IGNITION
STARTING
CHARGING
ALPHABETICAL INDEX
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August 1997
3RZ-F,3RZ-FE

INTRODUCTION
HOWTOUSETHISMANUALIN--1.............
GENERAL INFORMATION IN--1..................
IDENTIFICATION INFORMATION IN--3..........
ENGINE SERIALNUMBER IN--3.................
REPAIRINSTRUCTIONS IN--4.................
GENERAL INFORMATION IN--4..................
FOR ALLOF VEHICLESIN--7..................
PRECAUTION IN--7.............................
HOWTOTROUBLESHOOT
ECUCONTROLLED SYSTEMS IN--8.........
GENERAL INFORMATION IN--8..................
HOW TOPROCEED WITH
TROUBLESHOOTING IN--9....................
HOW TOUSE THE DIAGNOSTICCHART
AND INSPECTION PROCEDURE IN--21..........
TERMSIN--26.................................
ABBREVIATIONS USED IN
THISMANUAL IN--26..........................
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3RZ-F,3RZ-FE

IN02X--01
A01626
Throttle Position Sensor Connector
Throttle Body Vacuum Hose
zGasket
18 (185, 13)
N∙m(kgf∙cm,ft∙lbf)
Water Bypass Hose
zNon--reusable part
: Specified tongue
--INTRODUCTION HOW TO USE THIS MANUAL IN--1
HOW TOUSE THIS MANUAL
GENERAL INFORMATION
1.INDEX
An INDEX is provided on the first page of each section to guide you to the item to be repaired. To assist you
in finding your way through the manual, the Section Title and major heading are given at the top of every
page.
2.GENERAL DESCRIPTION
At the beginning of each section, a General Description is given that pertains to all repair operations con-
tained in that section.
Read these precautions before starting any repair task.
3. TROUBLESHOOTING
TROUBLESHOOTING tables are included for each system to help you diagnose the problem and find the
cause. The fundamentalsof how to proceed withtroubleshooting aredescribed on page IN--8
Be sure to read this before performing troubleshooting.
4. PREPARATION
PreparationliststheSST(SpecialServiceTools),recommendedtools,equipment,lubricantandSSM(Spe-
cialService Materials) which should be prepared before beginning the operation and explains the purpose
of each one.
5.REPAIRPROCEDURES
Most repair operations begin with an overview illustration. It identifies the components and shows how the
parts fit together.
Example:
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3RZ-F,3RZ-FE

Illustration:
what to do and where
21. CHECK PISTON STROKE OF OVERDRIVE BRAKE
(a) PlaceSSTandadialindicatorontotheoverdrivebrake
Pistonasshownintheillustration.
Taskheading: whattodo
SST 09350--30020 (09350--06120)
Set part No. Component part No.
Detailed text : howtodotask
(b) Measurethestrokeapplyingandreleasingthecompressed
air (392 — 785 kPa, 4 —8 kgf/cm2or 57—114 psi) asshown
in the illustration.
Piston stroke: 1.40 —1.70 mm (0.0551 — 0.0669 in.)
Specification
IN--2 --INTRODUCTION HOW TO USE THIS MANUAL
The procedures are presented in a step--by--step format:
SThe illustration shows what to do and where to do it.
SThe task heading tells what to do.
SThedetailed texttells howto performthe taskand givesother information such asspecifications
and warnings.
Example:
This format provides the experienced technician with a FAST TRACK to the informationneeded. Theupper
case task heading can be read at a glance when necessary, and the text belowitprovidesdetailed informa-
tion. Important specifications and warnings always stand out in bold type.
6.REFERENCES
References have been keptto a minimum. However,when theyare requiredyou aregiven thepage to refer
to.
7. SPECIFICATIONS
Specifications are presented in bold type throughout the text where needed. You never have to leave the
procedure to look up your specifications. They are also found in Service Specifications section, for quick
reference.
8.CAUTIONS,NOTICES,HINTS:
SCAUTIONS are presented in bold type, and indicate there is a possibility of injury to you or other
people.
SNOTICES are also presented in bold type, and indicate the possibility of damage to the components
being repaired.
SHINTS are separated from the text but do not appear in bold. They provide additional information to
help you perform the repair efficiently.
9.SIUNIT
The UNITS given in this manual are primarily expressed according to the SI UNIT (International Systemof
Unit), and alternately expressed in the metric system and in the English System.
Example:
Torque: 30 N∙m (310 kgf∙cm, 22 ft∙lbf)
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N17730
IN02Y--01
--INTRODUCTION IDENTIFICATION INFORMATION IN--3
IDENTIFICATIONINFORMATION
ENGINE SERIAL NUMBER
The engine serial number is stamped on the engine block as
shown.
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FI1066
IN02Z--01
IN--4 --INTRODUCTION REPAIR INSTRUCTIONS
REPAIR INSTRUCTIONS
GENERAL INFORMATION
BASICREPAIRHINT
(a) Use fender, seat and floor covers to keep the vehicle
clean and prevent damage.
(b) During disassembly, keep parts in the appropriate order
to facilitate reassembly.
(c) Observe the following:
(1) Before performing electrical work, disconnect the
negative (--) terminal cable from the battery.
(2) If it is necessary to disconnect the battery for in-
spection or repair, always disconnect the negative
(--) terminal cable which is grounded to the vehicle
body.
(3) To prevent damage to the battery terminal, loosen
thecablenutandraisethecablestraight upwithout
twisting or prying it.
(4) Clean the battery terminals and cable ends with a
cleanshoprag.Donotscrapethemwithafileoroth-
er abrasive objects.
(5) Install the cable ends to the battery terminals with
the nut loose, and tighten the nut after installation.
Donotuseahammertotapthecableendsontothe
terminals.
(6) Be sure the cover for the positive (+) terminal is
properly in place.
(d) Checkhoseand wiring connectorstomakesurethatthey
are secure and correct.
(e) Non--reusable parts
(1) Alwaysreplacecotterpins,gaskets,O--ringsandoil
seals etc. with new ones.
(2) Non--reusablepartsareindicatedinthecomponent
illustrations by the ”z” symbol.
(f) Precoated parts
Precoated parts are bolts and nuts, etc. that are coated
with a seal lock adhesive at the factory.
(1) If a precoated part is retightened, loosened or
causedtomoveinanyway,itmustberecoatedwith
the specified adhesive.
(2) When reusing precoated parts, clean off the old
adhesive and dry with compressed air. Then apply
the specified seal lock adhesive to the bolt, nut or
threads.
(3) Precoated parts are indicated in the component il-
lustrations by the ”L” symbol.
(g) When necessary, use a sealer on gaskets to prevent
leaks.
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BE1367
MediumCurrent Fuse andHighCurrentFuse
EqualAmperageRating
V00076
AbbreviationPart NameSymbolIllustration
FUSE
MEDIUMCURRENTFUSE
HIGHCURRENTFUSE
FUSIBLE LINK
CIRCUITBREAKER
FUSE
M--FUSE
H--FUSE
FL
CB
--INTRODUCTION REPAIR INSTRUCTIONS IN--5
(h) Carefully observe all specifications for bolt tightening
torques. Always use a torque wrench.
(i) Useofspecialservicetools(SST)andspecialservicema-
terials (SSM) may be required, depending on the nature
of the repair. Be sure to use SST and SSM where speci-
fied and follow the proper work procedure. A list of SST
and SSM can be found in the preparation part at thefront
of each section in this manual.
(j) When replacing fuses, be sure the new fuse has the cor-
rect amperage rating. DO NOT exceed the rating or use
one with a lower rating.
(k) Care must be taken when jacking up and supporting the
vehicle. Besureto lift andsupportthe vehicleat the prop-
er locations.
(1) If the vehicle is to be jacked up only at the front or
rearend,besuretoblockthewheelsattheopposite
end in order to ensure safety.
(2) After the vehicle is jacked up, be sure to support it
on stands. It isextremelydangerous todo any work
on a vehicleraised ona jackalone, evenfor asmall
job that can be finished quickly.
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IN0253
WRONG CORRECT
IN0252
WRONG CORRECT
IN0002
Example
IN--6
--INTRODUCTION REPAIR INSTRUCTIONS
(l) Observe the following precautions to avoid damage to the
following parts:
(1) Do not open the cover or case of the ECU unless
absolutely necessary. (If the IC terminals are
touched, the IC may be destroyed by static electric-
ity.)
(2) To disconnect vacuum hoses, pull on the end, not
the middle of the hose.
(3) To pull apart electrical connectors, pull on the con-
nector itself, not the wires.
(4) Be careful not to drop electrical components, such
as sensors or relays. If they are dropped on a hard
floor, they should be replaced and not reused.
(5) When steam cleaning an engine, protect the elec-
tronic components, air filter and emissions--related
components from water.
(6) Never use an impact wrench to remove or install
temperature switches or temperature sensors.
(7) When checking continuity at the wire connector, in-
sert the tester probe carefully to prevent terminals
from bending.
(8) When using a vacuum gauge, never force the hose
onto a connector that is too large. Use a step--down
adapter instead. Once the hose has been
stretched, it may leak.
(m) Tag hoses before disconnecting them:
(1) When disconnecting vacuum hoses, use tags to
identify how they should be reconnected.
(2) After completing a job, double check that the vacu-
um hoses are properly connected. A label under the
hood shows the proper layout.
(n) Unless otherwise stated, all resistance is measured at an
ambient temperature of 20˚C(68˚F). Because the resis-
tance may be outside specifications if measured at high
temperatures immediately after the vehicle has been run-
ning, measurements should be made when the engine
has cooled down.
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IN030--01
--INTRODUCTION FOR ALL OF VEHICLES IN--7
FORALL OFVEHICLES
PRECAUTION
1. FORVEHICLES EQUIPPED WITHACATALYTIC CONVERTER
CAUTION:
If large amounts of unburned gasoline flow into the converter, it may overheat and create a fire haz-
ard. To prevent this, observe the following precautions and explain them to your customer.
(a) Use only unleaded gasoline
(b) Avoid prolonged idling
Avoid running the engine at idle speed for more than 20 minutes.
(c) Avoid spark jump test
(1) Performsparkjumptestonlywhenabsolutelynecessary.Performthistestasrapidlyaspossible.
(2) While testing, never race the engine.
(d) Avoid prolonged engine compression measurement
Engine compression tests must be done as rapidly as possible.
(e) Do not run engine when fuel tank is nearly empty
This may cause the engine to misfire and create an extra load on the converter.
(f) Avoid coasting with ignition turned off and prolonged braking
(g) Do not dispose of used catalyst along with parts contaminated with gasoline or oil
2. IF VEHICLEIS EQUIPPED WITHMOBILECOMMUNICATION SYSTEM
For vehicles with mobile communication systems such as two--wayradiosand cellular telephones, observe
the following precautions.
(1) Install the antenna as far aspossible away from the ECU and sensorsof the vehicle’s electronic
system.
(2) Install the antenna feeder at least 20 cm (7.87 in.) away from the ECU and sensors of the ve-
hicle’s electronicssystems. For details aboutECU andsensors locations, refer to the sectionon
the applicable component.
(3) Do not wind the antenna feeder togetherwith the otherwiring. As much as possible, also avoid
running the antenna feeder parallel with other wire harnesses.
(4) Confirm that the antenna and feeder are correctly adjusted.
(5) Do not install powerful mobile communications system.
3.FORUSING HAND--HELD TESTER
CAUTION:
Observe the following for safety reasons:
S
SS
SBefore using the hand--held tester, the hand--held tester’s operator manual should be read
throughly.
S
SS
SBe sure to route all cables securely when driving with the hand--held tester connected to the
vehicle. (i.e. Keep cables away from feet, pedals, steering wheel and shift lever.)
S
SS
STwo persons are required when test driving with the hand--held tester, one person to drive the
vehicle and one person to operate the hand--held tester.
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IN031--01
IN--8 --INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
HOW TOTROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the HILUX. In general, the ECU controlled system
is considered to be a very intricate system requiring a high level of technical knowledge and expert skill to
troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one, troubleshooting of
these systems is not complex. If you have adequate understanding of the system and a basic knowledge
of electricity, accurate diagnosis and necessaryrepaircanbe performed to locate and fix the problem.This
manualisdesigned through emphasisofthe above standpoint to help service technicians performaccurate
and effective troubleshooting, and is compiled for the following major ECU controlled systems:
System Page
Engine
1RZ--E:
2RZ--FE:, 3RZ--FE: DI--1
The troubleshooting procedure and how to make use of it are described on the following pages.
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INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
HOWTOPROCEED WITHTROUBLESHOOTINGIN-9
1. CUSTOMER PROBLEMANALYSISIN-10
2. SYMPTOMCONFIRMATION AND DIAGNOSTIC TROUBLECODE CHECK IN-11/12
3.SYMPTOMSIMULATIONIN-13/14
4. 1RZ-E:DIAGNOSTIC TROUBLECODE CHART IN-15
5. 2RZ-FE,3RZ-FE:DIAGNOSTIC TROUBLECODE CHART IN-16
6.PROBLEM SYMPTOMS TABLE IN-17
7. 1RZ-FE:CIRCUIT INSPECTION IN-18
8. 2RZ-FE,3RZ-FE:CIRCUIT INSPECTIONIN-19/20
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IN032--01
Vehicle Brought Workshop
Customer Problem
Analysis
Symptom Confirmation
and Diagnostic Trouble
Code Check Symptom Simulation
Diagnostic Trouble
Code Chart
Matrix Chart of Problem
Symptoms
Circuit Inspection or Parts
Inspection
Repair
Confirmation Test
End
1
2
4
3
5
6
7
8
Ask the customer about the conditions and the
environment when the problem occurred.
1
Confirm the symptoms and the problem conditions,
and check the diagnostic trouble codes.
(When the problem symptoms do not appear
during confirmation, use the symptom simulation
method described later on.)
2, 3
Check the results obtain in Step 2, then confirm
the inspection procedure for the system or the part
which should be checked using the diagnostic
trouble code chart or the matrix chart of problem
symptoms.
4, 5, 6
Check and repair the affected system or part in
accordance with the instructions in Step 6.
7
After completing repairs, confirm that the problem
has been eliminated.
(If the problem is not reproduced, perform the
confirmation test under the same conditions and
in the same environment as when it occurred for
the first time.)
8
--INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS IN--9
HOW TOPROCEEDWITHTROUBLESHOOTING
Carry out troubleshooting in accordance withthe procedureon the following page.Here, only the basic pro-
cedure is shown. Details are provided in eachsection, showing the most effective methods foreach circuit.
Confirm the troubleshooting procedures firstfor therelevant circuit before beginningtroubleshooting of that
circuit.
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Important Points in the Customer Problem Analysis
DWhat ---------- Vehicle model, system name
DWhen ---------- Date, time, occurrence frequency
DWhere ---------- Road conditions
DUnder what conditions? ---------- Running conditions, driving conditions, weather conditions
DHow did it happen? ---------- Problem symptoms
(Sample) Engine control system check sheet.
ENGINE CONTROL SYSTEM Check Sheet
Customer’s Name
Driver’s Name
Data Vehicle
Brought in
License No.
Model and Model
Year
Frame No.
Engine Model
Odometer Reading km
miles
Problem Symptoms
Engine does
not Start
Difficult to
Start
Poor Idling
Poor
Drive ability
Engine Stall
Others
Engine does not crank No initial combustion No complete combustion
Engine cranks slowly
Other
Incorrect first idle Idling rpm is abnormal High ( rpm) Low ( rpm)
Rough idling Other
Hesitation Back fire Muffler explosion (after--fire) Surging
Knocking Other
Soon after starting After accelerator pedal depressed
After accelerator pedal released During A/C operation
Shifting from N to D Other
Datas Problem
Constant Sometimes ( times per day/month)
Inspector’s
Name
CUSTOMER PROBLEM ANALYSIS CHECK
IN--10 --INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
1.CUSTOMERPROBLEMANALYSIS
In troubleshooting, the problem symptoms must be confirmed accurately and all preconceptions must be
cleared away in order to give an accurate judgment. To ascertain just what the problem symptoms are, it is
extremely important to ask the customer about the problem and the conditions at the time it occurred.
Important Point in the Problem Analysis:
The following 5 items are important points in the problem analysis. Past problems which are thought to be
unrelatedandtherepairhistory,etc.mayalsohelpinsomecases,soasmuchinformationaspossibleshould
be gathered and its relationship with the problem symptoms should be correctly ascertained for reference
in troubleshooting. A customer problem analysis table is provided in the troubleshooting section for each
system for your use.
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DIAGNOSTICTROUBLECODE CHECK PROCEDURE
Diagnostic Trouble
Code Check (Make a
note of and then clear)
Confirmation
of Symptoms
Diagnostic Trouble
Code Check Problem Condition
Diagnostic Trouble
Code Display Problem symptoms
exist Same diagnostic trouble code is
displayed
Problem is still occurring in the diagnostic
circuit
Normal code is
displayed The problem is still occurring in a place other than in the diagnostic circuit.
(The diagnostic trouble code displayed
first is either for a past problem or it is a
secondary problem.)
No problem
symptoms exist The problem occurred in the diagnostic circuit in the past.
Normal Code Display Problem symptoms
exist Normal code is displayed The problem is still occurring in a place
other than in the diagnostic circuit.
No problem
symptoms exist Normal code is displayed The problem occurred in a place other than in the diagnostic circuit in the past.
--INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS IN--11
2.SYMPTOMCONFIRMATIONAND DIAGNOSTICTROUBLE CODE CHECK
The diagnostic system in the HILUX fulfills various functions. The first function is the Diagnostic Trouble
Code Check in which a malfunction in the signal circuits to the ECU is stored in code in the ECU memory
atthetimeofoccurrence,to beoutputbythetechnicianduringtroubleshooting.AnotherfunctionistheInput
Signal Check which checks if the signals from various switches are sent to the ECU correctly.
By using these check functions, the problemareascanbe narrowed down quickly and troubleshootingcan
be performed effectively. Diagnostic functions are incorporated in the following systems in the HILUX.
System Diagnostic Trouble
Code Check Input Signal Check (Sensor Check) Other Diagnosis Function
Engine f
(with Check Mode) fDiagnostic Test
Mode
Indiagnostictroublecodecheck,itisveryimportanttodeterminewhethertheproblemindicatedbythediag-
nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition,
it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic
trouble code is directlyrelated to the problem symptom or not. For thisreason, the diagnostic trouble codes
shouldbecheckedbeforeandafterthesymptomconfirmationtodeterminethecurrentconditions,asshown
in the table below. If this is not done, it may, depending on the case, result in unnecessary troubleshooting
for normallyoperating systems, thus making itmore difficult to locate the problem, orinrepairs notpertinent
to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic trouble
code check.
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Diagnostic trouble code check
Making anote of and clear ing of the diagnostic trouble codes displayed
Symptom confirmation No problem symptoms
exist
Problem symptoms
exist
Simulation test using the symptom
simulation methods
DNormal code displayed
DProblem symptoms exist DNormal code displayed
DNo problem symptoms exist
Diagnostic trouble code check
Troubleshooting of problem indicated
by diagnostic trouble code
DDiagnostic trouble code displayed
DProblem symptoms exist
SystemNormal
Troubleshooting of each
problem symptom If a diagnostic trouble code was
displayed in the initial diagnostic
trouble code check, it indicates
that thetroublemayhaveoccurred
in a wire harness or connector in
that circuit in the past. Therefore,
check the wire harness and con-
nectors(See page IN--21).
IN--12 --INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
Taking into account the above points, a flow chart showing how to proceed with troubleshooting using the
diagnostic trouble code check is shown below. This flow chart shows how to utilize the diagnostic trouble
code check effectively, then by carefully checking the results, indicates how to proceed eitherto diagnostic
trouble code troubleshooting or to troubleshooting of problem symptoms.
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V07268
VIBRATIONMETHOD: When vibrationseems tobethemajorcause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR
1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check if the
malfunction occurs.
Shake Slightly
Swing Slightly
Vibrate Slightly
HINT: Applying strong vibration to relays may result in open
relays.
--INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS IN--13
3. SYMPTOM SIMULATION
The most difficult casein troubleshooting iswhenthere are no problem symptomsoccurring. In suchcases,
athoroughcustomerproblemanalysismustbe carried out,thensimulate thesameorsimilarconditionsand
environment in which the problem occurred in the customer’s vehicle. No matter how much experience a
technician has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem
symptoms he will tend to overlook something important in the repair operation and make a wrong guess
somewhere, which will only lead to a standstill. For example, for a problem which only occurs when the en-
gine is cold, orfor a problem which occurs due to vibration caused by the road during driving,etc., theprob-
lem can never be determined so long as the symptoms are confirmed with the engine hot condition or the
vehicle at a standstill. Since vibration, heat or water penetration (moisture) are likely causes for problems
whicharedifficulttoreproduce,thesymptomsimulationtestsintroduced hereareeffectivemeasuresinthat
the external causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In thesymptomsimulationtest,the problemsymptoms should of course beconfirmed, but the problem area
orpartsmustalsobefound out.Todothis,narrowdownthepossibleproblemcircuitsaccordingtothesymp-
toms before starting this test and connect a tester beforehand. After that, carry out the symptomsimulation
test, judging whether the circuit being tested is defective or normal and also confirming the problem symp-
toms at the same time. Refer to the matrix chart of problem symptoms for each system to narrow down the
possible causes of the symptom.
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V07469
HEATMETHOD: When theproblem seems tooccurwhen thesuspect area isheated.2
NOTICE:
(1) Do not heat to more than 60 ˚C (140 ˚F). (Temperature
limit that no damage is done to the component.)
(2) Do not apply heat directly to parts in the ECU.
3WATER SPRINKLINGMETHOD:
NOTICE:
(1) Never sprinkle water directly into the engine
compartment, but indirectly change the temperature and
humidity by applying water spray onto the radiator front
surface.
(2) Never apply water directly onto the electronic
components.
4OTHER: When amalfunctionseems tooccurwhen electrical load isexcessive.
When themalfunctionseems tooccuronarainyday orina
high--humiditycondition.
Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.
ON
(Service hint)
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be used.
Malfunc-
tion
IN--14 --INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
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3RZ-F,3RZ-FE

DDTC No.
Indicates the diagnostic trouble code.
DPage or Instructions
Indicates thepagewherethe inspectionprocedure
for each circuit is to be found, or gives instructions
for checking and repairs.
DDetection Item
Indicates the system of the problem or
contents of the problem.
DTrouble Area
Indicates the suspect area of the
problem.
NE Signal Circuit
Detection Item
DOpen or short in NE circuit
DIIA
DOpen or short in STA circuit
DEngine ECU
DTC No.
(See page) Trouble Area
*1
Check Engine
WarmingLight
Nomal Mode/
Test Node
*Memory
(DI -- 12)
NE Signal Circuit
DOpen or short in IGF or IGT circuit from IIA to engine ECU
DIgniter
DEngine ECU
Ignition Signal Circuit
DOpen or short intake air temp. sensor circuit
DIntake air temp. sensor
WaterTemp.Sensor Circuit
DTC CHART (SAE Controlled)
HINT: Parameters listed in the chart may not be exactly the same as your reading dueto the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below. For details of each code, turn to the page referred to under the ”See page” for the respective
”DTC No.” in the DTC chart.
DOpen or short in NE circuit
DIIA
DEngine ECU
DOpen or short in water temp. sensor circuit
DWater temp. sensor
DEngine ECU
12
(DI -- 28)
13
(DI -- 31)
14
(DI -- 32)
22
ON / N.A
ON / N.A
ON / N.A
ON / N.A
--INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS IN--15
4. 1RZ--E:
DIAGNOSTICTROUBLE CODE CHART
Theinspectionprocedureisshowninthetablebelow.Thistablepermitsefficientandaccuratetroubleshoot-
ingusing thediagnostictroublecodes displayedin thediagnostic trouble code check. Proceed withtrouble-
shooting in accordance with the inspection procedure given in the diagnostic chart corresponding to the
diagnostictroublecodesdisplayed.Theenginediagnostictroublecodechartisshownbelowasanexample.
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TO MODEL INDEX
CONTINUED
3RZ-F,3RZ-FE

DDTC No.
Indicates the diagnostic trouble code.
DPage or Instructions
Indicates thepagewherethe inspectionprocedure
for each circuit is to be found, or gives instructions
for checking and repairs.
DDetection Item
Indicates the system of the problem or
contents of the problem.
DTrouble Area
Indicates the suspect area of the
problem.
Air Flow Circuit Malfunction
Detection Item
DOpen or short in air flow meter circuit
DAir flow meter
DEngine ECU
DTC No.
(See page) Trouble Area CHK ENG *Memory
(DI -- 12)
Intake Air Temp. Circuit Malfunction
DOpen or short in water temp. sensor circuit
DWater temp. sensor
DEngine ECU
Water Temp. Circuit Malfunction
DOpen or short in Oxygen sensor circuit
DOxygen sensor
Throttle Position Sensor circuit
Malfunction
DTC CHART (SAE Controlled)
HINT: Parameters listed in the chart may not be exactly the same as your reading dueto the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below. For details of each code, turn to the page referred to under the ”See page” for the respective
”DTC No.” in the DTC chart.
DOpen or short in intake air temp. sensor circuit
DIntake air temp. sensor
DEngine ECU
DOpen or short in throttle position sensor circuit
DThrottle position sensor
DEngine ECU
P0100/31
(DI -- 28)
P0110/24
(DI -- 31)
P0115/22
(DI -- 32)
P0120/41
--
--
*1
IN--16 --INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
5. 2RZ--FE:,3RZ--FE:
DIAGNOSTICTROUBLE CODE CHART
Theinspectionprocedureisshowninthetablebelow.Thistablepermitsefficientandaccuratetroubleshoot-
ingusing thediagnostictroublecodes displayedin thediagnostic trouble code check. Proceed withtrouble-
shooting in accordance with the inspection procedure given in the diagnostic chart corresponding to the
diagnostictroublecodesdisplayed.Theenginediagnostictroublecodechartisshownbelowasanexample.
CLICK HERE TO VIEW CHAPTER INDEX Pages From Supplement
TO MODEL INDEX
CONTINUED
3RZ-F,3RZ-FE