2001 TOYOTA HIGHLANDER o2 sensor

01-48
- INTRODUCTIONTERMS
48 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U) TCM
Transmission Control ModuleTransmission ECU, ECT ECU
TPThrottle PositionThrottle Position
TRTransmission Range-
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree-W ay Catalytic Converter
Three-W ay Catalytic (TWC)
Manifold Converter
CC
RO
TWC+OCThree-W ay + Oxidation Catalytic ConverterCCR + CCo
VA FVolume AirflowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor
WOTWide Open ThrottleFull Throttle
WU-OCWarm Up Oxidation Catalytic Converter-
WU-TWCWarm Up Three-Way Catalytic Converter-
3GRThird Gear-
4GRFourth Gear-

- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-29
29 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE
HINT:
The diagnostic system in the HIGHLANDER has various functions.
The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU
memory whenever a malfunction in the signal circuits to the ECU occurs. In a DTC check, a previous
malfunction's DTC can be checked by a technician during troubleshooting.
Another function is the Input Signal Check, which checks if the signals from various switches are sent
to the ECU correctly.
By using these functions, the problem areas can be narrowed down and troubleshooting is more effec-
tive. Diagnostic functions are incorporated in the following systems in the HIGHLANDER:
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Diagnotis Test Mode
(Active Test)
SFI System
(with Check Mode)
ABS with EBD & BA & TRAC & VSC System
Electronic Controlled Automatic Transaxle [ECT]
(with Check Mode)
Air Conditioning System
Supplement Restraint System
Power Window Control System
Power Door Lock Control System
Wireless Door Lock Control System
Engine Immobiliser System
Multiplex Communication System
Cruise Control System
In the DTC check, it is very important to determine whether the problem indicated by the DTC is: 1 still
occurring, or 2 occurred in the past but has since returned to normal. In addition, the DTC should be
compared to the problem symptom to see if they are related. For this reason, DTCs should be checked
before and after confirmation of symptoms (i.e., whether or not problem symptoms exist) to determine
current conditions, as shown in the table below.
Never skip the DTC check. Failure to check DTCs may, depending on the case, result in unnecessary
troubleshooting for systems operating normally or lead to repairs not pertinent to the problem. Follow
the procedures listed above in the correct order.
A flow chart showing how to proceed with troubleshooting using the DTC check is shown below. Direc-
tions from the flow chart will indicate should be performed DTC troubleshooting or to the troubleshoot-
ing of each problem symptom.
1 DTC CHECK
2 MAKE A NOTE OF DTCS DISPLAYED AND THEN CLEAR THE MEMORY
3 SYMPTOM CONFIRMATION
aSymptoms exist
bNo symptoms exist
a Go to step 5

B71602
Vibrate Slightly
Shake Slightly
Vibrate
Slightly
D25084
Malfunction
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-31
31 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no problem symptoms occur. In such cases, a thorough
customer problem analysis must be carried out. A simulation of the same or similar conditions and environ-
ment in which the problem occurred in the customer's vehicle should be carried out. No matter how much
skill or experience a technician has, troubleshooting without confirming the problem symptoms will lead to
important repairs being overlooked and mistakes or delays.
For example:
With a problem that only occurs when the engine is cold or occurs as a result of vibration caused by the road
during driving, the problem can never be determined if the symptoms are being checked on a stationary ve-
hicle or a vehicle with a warmed-up engine.
Vibration, heat or water penetration (moisture) is difficult to reproduce. The symptom simulation tests below
are effective substitutes for the conditions and can be applied on a stationary vehicle.
Important points in the symptom simulation test:
In the symptom simulation test, the problem symptoms as well as the problem area or parts must be con-
firmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the tester
and carry out the symptom simulation test, judging whether the circuit being tested is defective or normal.
Also, confirm the problem symptoms at the same time. Refer to the problem symptoms table for each system
to narrow down the possible causes.
1. VIBRATION METHOD: When vibration seems to be
the major cause.
(a) PART AND SENSOR
(1) Apply slight vibration with a finger to the part of the
sensor considered to be the cause of the problem
and check whether or not the malfunction occurs.
HINT:
Applying strong vibration to relays may open relays.
(b) CONNECTORS
(1) Slightly shake the connector vertically and horizon-
tally.
(c) WIRE HARNESS
(1) Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas that should be checked thoroughly.
2. HEAT METHOD: If the problem seems to occur when
the area in question is heated.
(a) Heat the component that is the possible cause of the mal-
function with a hair dryer or similar device. Check if the
malfunction occurs.
NOTICE:
Do not heat to more than 60C (140F). Exceeding this
temperature may damage components.
Do not apply heat directly to the parts in the ECU.

Detection Item
Indicates the system or details of the
problem.Trouble Area
Indicates the suspect areas of
the problem.
Detection Item DTC No.
(See page)Trouble AreaSRS

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
B0103/12
(05-132) B0102/11
(05-128)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit for that code listed in the table
below (Proceed to the page given for that circuit).

Short in D squib circuit

Open in D squib circuit
B0101/14
(05-124)

Short in D squib circuit (to ground)

Short in D squib circuit (to B+)
Warning Light
ON
ON
ON
ON
Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness

Steering wheel pad (squib)

Spiral cable

Airbag sensor assembly

Wire harness
B0105/53
(05-136)ON

Airbag sensor assembly

Wire harness B0106/54
Open in P squib circuit

Airbag sensor assembly

Wire harness
Short in P squib circuit (to Ground)ON
ON B0100/13
(05-1 19)

Short in P squib circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Wire harness

Front passenger airbag assembly (squib)

Front passenger airbag assembly (squib)
Page or Instructions
Indicates the page where the inspection proce-
dures for each circuit is to be found, or gives
instructions for checking and repairs.
DTC No.
Indicates the diagnostic trouble code.



- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-33
33 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DIAGNOSTIC TROUBLE CODE CHART
Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble
area and proper inspection procedure. The Supplemental Restraint System (SRS) diagnostic trouble code
chart is shown below as an example.

SFI
SFISFI
SFISFI
SFISFI
SFI
D25842

Circuit Description
The major role, operation of the circuit and its
component parts are explained.

Diagnostic Trouble Code No. and Detection Item

Indicates the diagnostic trouble codes, diagnostic
trouble code settings and suspect areas for a
problem.
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow, SB = Sky Blue
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe.
Inspection Procedures
Use the inspection procedures to determine
if the circuit is normal or abnormal. If it is ab-
normal, use it to determine whether the prob-
lem is located in the sensors, actuators, wire
harness or ECU.

Indicates the condition of the connector of the ECU
during the check.


Connections of tester are
indicated by (+), (-) after
terminals name.
Connector being checked
is connected.Connector being checked
is disconnected.
For inspection of connector
with body ground, there is
nothing about the body
ground written down.
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS01-35
35 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CIRCUIT INSPECTION
How to read and use each page is shown below.

I44266
ECM
E2
THW E719 E728
BR
G-BBR*1
1
2 5
S29 S285
E2
Engine
Coolant
Temp Sensor Short ConnectorC11
Combination Meter Assy
BEANMPX- 21
*1: 2AZ-FE
*2: 3MZ-FEW-B*2 BR
05-1896
- DIAGNOSTICSCOMBINATION METER
2086 Author
: Date
:
MALFUNCTION IN WATER TEMPERATURE RECEIVER GAUGE
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If there is an open or short in the engine coolant temperature sensor circuit, the ECM outputs DTCs. Perform
troubleshooting with the ºSFI System 05-5,.05-366º.
1 PERFORM ACTIVE TEST BY HAND-HELD TESTER
(a) Operate the hand-held tester according to the steps on the display and select the ºACTIVE TESTº.
METER:
ItemTest DetailsDiagnostic Note
COOLANT TEMPLOW / NORMAL / HI-
OK:
Needle indication is normal.
NG REPLACE COMBINATION METER ASSY
(SEE PAGE 71-18)
OK
05IQ0-05

- DIAGNOSTICSCOMBINATION METER
05-1897
2087 Author
: Date
:
2 READ VALUE OF HAND-HELD TESTER(ENGINE COOLANT)
(a) Operate the hand-held tester according to the steps on the display and select the ºDATA LISTº.
ECM:
ItemMeasurement Item/
Range (Display)Normal ConditionDiagnostic Note
COOLANT TEMPCoolant Temperature / Min.: -40
C
(-40°F), Max.: 140
C (284°F)After warming up: 80 to 95°C (176
to 203°F)If the value is º-40
C (-40°F)º or
º140
C (284°F)º, sensor circuit is
open or shorted.
OK:
Coolant temperature displayed on the tester is between 80
C (176
F) and 95
C (203
F) after
warning up.
NG GO TO ENGINE CONTROL SYSTEM
(SEE PAGE 05-5, 05-366)
OK
3 REPLACE COMBINATION METER ASSY
OK:
Normal operation
NG GO TO ENGINE CONTROL SYSTEM
(SEE PAGE 05-5, 05-366)
OK
END

18091-05
CHECK POWER SUPPLY TO IGNITION COIL (WITH
IGNITER)
SPARK TEST
1. Turn ignition switch ON.
2. Check that there is battery voltage at ignition coil positive (+)
terminal.
CHECK IF WIRE HARNESS SIDE CONNECTOR OF
IGNITION COIL (WITH IGNITER) IS SECUREConnect securely.
Check wiring between ignition switch to
ignition coil (with igniter).
NG
OK
OKNG
NG PERFORM SPARK TEST WITH A DIFFERENT
IGNITION COIL (WITH IGNITER)
1. Replace current ignition coil (with igniter) with a different,
functioning ignition coil (with igniter).
2. Perform spark test again.
OKIf sparks occur, replace faulty ignition coil
(with igniter).
NG
Continue on next page
Standard:ColdHot
1,060 to 1,645 W
OKNG
835 to 1,400 WReplace camshaft position sensor. CHECK RESISTANCE OF CAMSHAFT POSITION
SENSOR (See page 18-5)
- IGNITIONIGNITION SYSTEM (2AZ-FE)
18-1
2861 Author
: Date
:
IGNITION SYSTEM (2AZ-FE)
ON-VEHICLE INSPECTION
NOTICE:
In this section, the terms coldº and hotº refer to the temperature of the coils. ºColdºmeans approxi-
mately -10C (14F) to 50C (122F). ºHotº means approximately 50C (122F) to 100C (212F).
1. INSPECT IGNITION COIL ASSY (WITH IGNITER) AND PERFORM SPARK TEST
(a) Check for DTCs.
NOTICE:
If a DTC is present, perform a troubleshooting in accordance with the procedure for that DTC.
(b) Check if sparks occur.
(1) Remove the engine cover No. 1 (see page 14-24).
(2) Remove the ignition coils.
(3) Using a 16 mm (0.63 in.) plug wrench, remove the spark plugs.
(4) Install the spark plugs to each ignition coil and connect the ignition coil connectors.
(5) Disconnect the 4 injector connectors.
(6) Ground the spark plugs.
(7) Check if sparks occur at each spark plug while the engine is being cranked.
NOTICE:

Be sure to ground the spark plug when checking.

Replace the ignition coil if given physical impact is given to the coil.

Do not crank the engine for more than 2 seconds.
If the sparks do not occur, do the following test: