o2 sensor TOYOTA HIGHLANDER 2001 Service Owner's Manual

'05 HIGHLANDER_U (L/O 0409)
120
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
HEADLIGHTS
To turn on the following lights: Twist
the headlight/turn signal lever knob.
Position 1ÐParking, tail, license plate,
side marker and instrument panel lights
Position 2ÐHeadlights and all of the
above
Position 3 (AUTOº)ÐHeadlights and/or all
of the lights in position 1
They automatically turn on or off depend-
ing on the darkness of the surroundings.
Manually twist the knob to the position 2
to turn on the headlights if they are need-
ed immediately when entering a dark tun-
nel, parking structure, etc.The automatic light control sensor is on
the top of the driver's side instrument
panel.
Do not place anything on the instrument
panel, and/or do not affix anything on the
windshield to block this sensor.
If you feel that the automatic light control
comes into operation too early or too late,
have the sensor adjusted by your Toyota
dealer.The lights automatically turn off when the
driver 's door is opened with the ignition
key in the ACCº or LOCKº position. To
turn them on again, turn the key to the
ONº position or actuate the headlight
switch. If you are going to park for over
one week, make sure the headlight switch
is off.
NOTICE
To prevent the battery from being dis-
charged, do not leave the lights on
for a long period when the engine is
not running.
Daytime running light system
(on some models)
The headlights turn on at reduced intensi-
ty when the parking brake is released with
the engine started, even with the light
switch in the OFFº position. They will not
go off until the ignition switch is turned
off.
To turn on the other exterior lights and
instrument panel lights, twist the knob to
position 1.
Twist the knob to position 2 to turn the
headlights to full intensity for driving at
night.
Headlights and turn signals
(with automatic light control
system)

2005 HIGHLANDER (EWD592U)
89
(
Shielded)
A 8
WM-
WA 10 A 3 A 2 A 1M+
B
Y
Y BRW
W
D 5D23 D31
3 1E 9 BR
4 2
Y B- W
BR B- R
B- R
B- RGR MREL
A1A- A1A+ HA1A FC BATT +B +B2
A 9
P
IGSW
A 6
B- R
B- R
Y GR
BR
T13
E2 P- L
BR
P5A
BRG
5 1
VG THA EVG
R L- B L- W
3
17 C
#1
E 4
(
Shielded)
GE01 M+
B
34 E
2
12
28 E 19 E18 E 31 E C 3 E 9
1
2BR
5 43
M 1
2C1
W
M- VTA1 E 9
G B- R
B- W
B- R
Y Y
5B
G- B BR
BR
6
E 21
B- RVTA2 VC THW E2E 2
PRG
1
L
EI 6
#2
2
B
E2VC
#3
3E 29 E20
4
W
BR
VTA2
Y
VTA1
E 30
E #4
I 7
V 4
P (
Shielded) B
Y
L
P
G
5A 12ELS2
EXCDIA1 7
E 9
GR * 1 : w/ Rear Seat Entertainment System
IM15
G
(
*1)(
*1)
IK3 13S28(
A)
, S29(
B)
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
Air Fuel Ratio Sensor
(
Bank 1 Sensor 1)Engine Coolant Temp. Sensor
Engine Control Module
Mass Air Flow Meter
Short Connector
Throttle Control Motor
VSV (
EVAP)
Voltage Inverter V15
+B E2
E2G THA VG
HT AF+
+B AF- Throttle Position Sensor

2005 HIGHLANDER (EWD592U)
90
Engine Control for 2AZ-FE
15
27 13 IM1
Y- G
VPMP
IM14
J 7V
Y
14 16 IO1 3 IO1
WR
L
4IO1 BJ1 17
BR
IM1
L P BR
21
L
PPMPA A
MPMP
LG
4 IM1 12IO1 5 IO1
A
YGR
L BR
B
W
Y R
1 E BR
Y GR
BRC17
SB
1
W
D 7IO1
Ignition Coil
and Igniter s
93
Ignition Coil
and Igniters
28 O1B-13
Y (
Shielded)
1
R
8
IM1
G R- Y
W
14 18
H10
2 24
D 225 C 24 C 27 C 1D BJ1 BJ1(
Shielded)
4 2D 21 D29
3 1
B BR GR
BJ1 12 BJ1
(
Shielded)(
Shielded)
1
2 1
2
EE
G
GR
C 7 C 1
2B
R FKNK1
G
R
R 16
HT1BOX1B KNK1 G2+ NE- NE+
I 6 3IM1 6IM1IGT1
Y- B
IGF1
R- W
IGT2
P
IGT3
W- R
24 E 11 E 10 E 9E 8E BJ1
IGT4
L- Y
D 7 7C
W- B W- B
E03 E04 E1
C
BR
1 2
C 16 C15
G- W
G- R
OC1+ OC1-
C 2
P (
Shielded)
I 8 R BR A
A
A
A
A
P A(
Shielded)
(
Shielded)
BR W- B W- B
I 9
GR
GR
6W- B
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
Camshaft
Position Sensor
Camshaft Timing Control
Valve
Cr ankshaft
Position Sensor
Char coal Canister Assembly
Engi ne Control Module
Heated Oxygen Sensor
(
Bank 1 Sensor 2)
Junction
Connector
EKP EKN EKR EKL EKQ EKSEKM
HT OX
TB E
Knock Sensor
(
Bank 1) K 1

2005 HIGHLANDER (EWD592U)
91
S15
C 224L 3
B Y- B
O 1
A 292
BR
EPA2 EPA2
12
1+BM
W
B 6A27
VPA2
VPA2
W
210A
ETCS
3
23 A
MOPS
R 4M
A A
B
GY
17 31 24TRC-
C 10
17E 20A
STOP
1E 1
E 6
P 2
TRC+ 1 2
A
Y BR R- L
W- B W- B
E02 E01 PSW
25 STPB 19
EFNEO
V
2
2
E 16
NSW
B- R
E 17
STA
B
54
NP7. 5A
STARTER
EB2 3
E 7
B- R L B- R P 1
R
P PENG+
A30
R
ENG-
A
Skid Control ECU
with Actuator
W- B W- B
A 271
L
VCP2 VCP2
A 285
R
EPA EPA
A 226
B
VPA VPA
A 264
G
VCPA VCPA
B 27
B
IMI
B 26
V
IMO
EFIO EFII67
T1 4 2
IC1 4
R
4C
W- B
ME01
I 6
W- G
G 14C 21RL
L W- BW- B
NC- NC+ NT- NT+
W- GY R- WWT 3
C 6
D 261
2
D 34 35 D 2 1
27 D
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C) Fr om Power Source System (
See Page 62)
Accel Position Sensor
Counter Gear Speed
Sensor
Engi ne Control Module
Gen erat or
Oil Pressur e SWPark/Neutral
Position SW
Power Steering Oil
Pressure SW
Stop Light SW
Turbine Speed Sensor
Transponder Key Computer

2005 HIGHLANDER (EWD592U)
93
O
L
Y
P5
W
Y
GR
IF3
A 10
B 6MPX2
MPX1
O
L 8
O
SBSBY
7
1IB2MPX1
MPX2
P 5 Y
8IB2
V
4A 5
4F 7
A 2 A 1B 1B2
IL2 12
V
114
MPD1
MPD2G 5G
B 2
A 9MPX+
MPX-A17
13E3J 12
(
*2) G
(
*3)
(
*2)R SB
R
BRBR
G Y
BR
BR
24
MPX122
MPX2P * 2 : w/ Navigation System
* 3 : w/o Navigation System W- B
BB BF AAABJ1 15
W- B W- B W- B
W- B
J1 9
A10(
A)
, A11(
B) B 9(
A)
, B10(
B)
S30(
A)
, S31(
B) A/C Control Assembly
Airbag Sensor Assembly
Body ECU
Gat eway ECU
Ju nctio n
Connector
Power Window Master SW
with ECU
Short Connector

2005 HIGHLANDER (EWD592U)
95
The engine control system utilizes a microcomputer and maintains overall control of the engine, transmission etc. An outline
of the engine control is given here.
1. Input Signals
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built-in thermistor with a resistance, which
varies according to the engine coolant temp.. The engine coolant temp. which is input into TERMINAL THW of the
engine control module as a control signal.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp. which is input as a
control signal to TERMINAL THA of the engine control module.
(3) Vehicle speed signal circuit
The vehicle speed signal is input from the ABS speed sensor to skid control ECU with actuator, and are sent to the
engine control module through communication control.
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
Camshaft position is input as a control signal to TERMINAL G2+ of the engine control module, and engine RPM is input
into TERMINAL NE+.
(5) Throttle position signal circuit
The throttle position sensor detects the throttle valve opening angle as a control signal, which is input into TERMINALS
VTA1 and VTA2 of the engine control module.
(6) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. With the ignition SW turned on, the
voltage for engine control module start-up power supply is applied to TERMINALS +B and +B2 of the engine control
module via the EFI relay.
The current flowing through the IGN fuse flows to TERMINAL IGSW of the engine control module.
(7) Intake air volume signal circuit
Intake air volume is detected by the mass air flow meter and the signal is input to TERMINAL VG of the engine control
module as a control signal.
(8) Stop light SW signal circuit
The stop light SW is used to detect whether the vehicle is braking or not and the signal is input into TERMINAL STP of
the engine control module as a control signal.
(9) Starter signal circuit
To confirm whether the engine is cranking, the voltage is applied to the starter motor during cranking is detected and the
signal is input into TERMINAL STA of the engine control module as a control signal.
(10) Engine knock signal circuit
Engine knocking is detected by knock sensor and the signal is input into TERMINAL KNK1 as a control signal.
(11) Air fuel ratio signal system
The air fuel ratio is detected and input as a control signal into TERMINAL A1A+ of the engine control module.
(12) Oxygen sensor signal circuit
The oxygen density in the exhaust gases is detected and input as a control signal into TERMINAL OX1B of the engine
control module. To maintain stable detection performance by the heated oxygen sensor, a heater is used for warning the
sensor. The heater is also controlled by engine control module (O1B-).
(13) Fuel cut in a collision
The system receives the collision signal from center airbag sensor assembly in the vehicle has a collision and stops the
fuel pump operation on the side of the engine control module.
System Outline

2005 HIGHLANDER (EWD592U)
96
Engine Control for 2AZ-FE
2. Control System
*SFI system
The SFI system monitors the engine condition through the signals input from each sensor (Input signals from (1) to (12)
etc.) to the engine control module. And the control signal is output to TERMINALS #1, #2, #3 and #4 of the engine
control module to operate the injector (Inject the fuel). The SFI system controls the fuel injection operation by the engine
control module in response to the driving conditions.
*ESA system
The ESA system monitors the engine condition through the signals input to the engine control module from each sensor
(Input signals from (1) to (12) etc.). The best ignition timing is decided according to this data and the memorized data in
the engine control module and the control signal is output to TERMINALS IGT1, IGT2, IGT3 and IGT4. This signal
controls the igniter to provide the best ignition timing for the driving conditions.
3. Diagnosis System
With the diagnosis system, when there is a malfunction in the engine control module signal system, the malfunctioning
system is recorded in the memory. The malfunctioning system can be found by reading the code displayed by the
malfunction indicator lamp.
4. Fail-safe System
When a malfunction has occurred in any system, if there is a possibility of engine trouble being caused by continued control
based on the signals from that system, the fail-safe system either controls the system by using data (Standard values)
recorded in the engine control module memory or else stops the engine.
CIRCUIT OPENING Relay
5-3 : Closed with the starter running
EFI Relay
5-3 : Closed with the ignition SW at ON or ST position
E5 (A), E6 (B), E7 (E), E8 (D), E9 (C) Engine Control Module
BATT-E1 : Always 9.0-14.0 volts
VC-E2 : 4.5-5.5 volts (Ignition SW at ON position)
VG-EVG : 1.1-1.5 volts (Engine idling and A/C SW off)
THA-E2 : 0.5-3.4 volts (Engine idling and intake air temp. 20°C, 68°F)
THW-E2 : 0.2-1.0 volts (Engine idling and coolant temp. 80°C, 176°F)
IG1-E1 : 4.5-5.5 volts (Ignition SW at ON position)
Pulse generation (Engine idling)
SIL-E1 : Pulse generation (During transmission)
TACH-E1 : Pulse generation (Engine idling)
STA-E1 : 6.0 volts or more (Engine cranking)
FC-E01 : 9.0-14.0 volts (Ignition SW at ON position)
SPD-E1 : Pulse generation (Ignition SW on and rotate driving wheel slowly)
W-E01 : Below 3.0 volts (Ignition SW at ON position)
NSW-E1 : 9.0-14.0 volts (Ignition SW on and other shift position in P or N position)
0-3.0 volts (Ignition SW on and shift position in P or N position)
PRG-E01 : 9.0-14.0 volts (Ignition SW at ON position)
STP-E1 : 7.5-14.0 volts (Ignition SW on and brake pedal depressed)
Below 1.5 volts (Ignition SW on and brake pedal released)
KNK1-E1 : Pulse generation (Engine idling)
PSW-E1 : 9.0-14.0 volts (Ignition SW at ON position)
HA1A-E04 : Below 3.0 volts (Engine idling)
IGSW-E1 : 9.0-14.0 volts (Ignition SW at ON position)
MREL-E1 : 9.0-14.0 volts (Ignition SW at ON position)
G2+, NE+ -NE- :
Pulse generation (Engine idling)
OC1+ -OC1- : Pulse generation (Ignition SW at ON position)
HT1B-E1 : 9.0-14.0 volts (Engine idling)
Below 3.0 volts (Ignition SW at ON position)
A1A+ -E1 : 3.3 volts (Ignition SW at ON position)
OX1B-E1 : Pulse generation (Maintain engine speed at 2500 rpm for 90 sec. after warming up)
IGT1, IGT2, IGT3, IGT4-E1 : Pulse generation (Engine idling)
#1, #2, #3, #4-E01 : 9.0-14.0 volts (Ignition SW at ON position)
Pulse generation (Engine idling)
Service Hints

'05 HIGHLANDER_U (L/O 0409)
141
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
(i) Open Door Warning Light and Buzz-
er
This light remains on until all the side
doors and back door are completely
closed.
If the vehicle speed rises above 5 km/h
(3 mph) with any door open, a buzzer
sounds.
(j) Automatic Transmission Fluid
Temperature Warning Light
(four- wheel drive models)
This light warns that the automatic trans-
mission fluid temperature is too high.
If this light comes on while you are driv-
ing, slow down and pull off the road. Stop
the vehicle at a safe place and put the
selector lever in Pº. With the engine id-
ling, wait until the light goes off. If the
light goes off, you can start the vehicle
again. If the light does not go off, call a
Toyota dealer or qualified repair shop for
assistance.
NOTICE
Continued driving with the warning
light on may damage the automatic
transmission.
(k) SRS Warning Light
This light will come on when the igni-
tion key is turned to the ONº position.
After about 6 seconds, the light will go
off. This means the systems of the air-
bag and front seat belt pretensioners
are operating properly.
This warning light system monitors the
airbag sensor assembly, front airbag sen-
sors, side and curtain shield airbag sen-
sors, curtain shield airbag sensors, driv-
er 's seat position sensor, driver 's seat belt
buckle switch, front passenger occupant
classification system, AIRBAG ONº indi-
cator light, AIRBAG OFFº indicator light,
front passenger 's seat belt buckle switch,
seat belt pretensioner assemblies, inflat-
ors, warning light, interconnecting wiring
and power sources.
If either of the following conditions occurs,
this indicates a malfunction somewhere in
the parts monitored by the warning light
system. Contact your Toyota dealer as
soon as possible to service the vehicle.

The light does not come on when the
ignition key is turned to the ONº posi-
tion or remains on for more than 6
seconds or flashes.

The light comes on or flashes while
driving.If the light stays on, it indicates that the
SRS driver and front passenger airbag
system and/or front passenger occupant
classification system and AIRBAG ONº
and AIRBAG OFFº indicator lights have a
problem. If the light flashes, the SRS side
airbag system and/or curtain shield airbag
system have a problem.
(l) VSCº Warning Light
This light warns that there is a problem
somewhere in the vehicle stability control
system or traction control system.
The light will come on when the ignition
key is turned to ONº, and will go off after
a few seconds.
If the light comes on while driving, the
system does not work. However, as con-
ventional braking operates when applied,
there is no problem to continue your driv-
ing.
In the following cases, contact your Toyota
dealer:

The warning light does not come on
after the ignition key is turned to ONº.

The warning light remains on after the
ignition key is turned to ONº.

The warning light comes on while driv-
ing.

2005 HIGHLANDER (EWD592U)
103
20 IM1
W- B W- B
W- B
W- B W- B W- BBR G- BY BR
L- W
GP
Y- GG Y- R R- BL- Y
9
J 6
IM1
7C
EC ED6E 7E PL RL NL DL 2L LL
61 97382
6D 1C D7E03
W- B
W- B J 7
9B B 20 B 10 7A B 11 A 6
A
A R
BR
B- R
VC
3 5
VTA2 R
1 2
E14 E 28 E18 E19
VTA1
BR
T1 3
E 2
4 64AP 1
54K
PR ND3 2
E2 VC THW E04E1 E05 E01 E02 B
B C
C B
B7IM1 18 IM1 8IM1 19 IM1
I 6
J 6
J17Y GRL VV
L
GR
G
E 31VTA2
R- W
6E 21VTA1G
NC- NC+ NT- NT+
W- GR R- WWT 3
C 6
D 261
2
D 34 35 D 2 1
27 D B
BR
A 5B 5
E2
W- BW- B W- BG
RB
BR4CME01
W- B
I 6
W
M- 1C 2M- M+
3C
2
M+
B
GE0 1
C 17
Y
(
Shielded)
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
S28(
A)
, S29(
B)
Counter Gear Speed
Sensor Engine Coolant Temp.
Sensor
Engine Control Module Engine Control Module
Junction
Connector
Junction
Connector
Junction
ConnectorJunction
Connector
A/T Indicator SW
Shor t Connector
Turbine Speed Sensor
Thr ottle Position Sensor Throttle Control Motor

2005 HIGHLANDER (EWD592U)
104
ECT and A/T Indicator for 3MZ-FE
BMPX-
A
1MPX1
W
2IF3R
SNOW MPX1
A 16
10
GR
ODMS9
MPX2
L
GR W- B
L
W- BW- BR
MPX2
V GR Y
E 4
29 BBR
R
8B
6
IB 13 3F6
83H3
4 A17
IF3 82B A IB2 8
IB2 1
IF3 5
15
O
7
8 MPX1
MPX2
A
P 5
MPX+
W
18 B
52
BR G
B
Y
SPD
17 B
IL2 9
Y
G
83D2 B 1
A 1A2
BR
24
MPX1
BR
22
MPX2
G V
4
11MPD1
MPD2
G 5
IL2 12
SB
74F 54AG
SB
Y IL2 1
SB
IF3 12
(
*1) (
*1)
G
(
*2)
G
Y
T16
S30(
A)
, S31(
B)
A10(
A)
, A11(
B)
B 9(
A)
, B10(
B)
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
A/C Control Assembly Airbag Sensor Assembly
Body ECU
Electronically Controlled
Transmission Pattern Select SW
Engine Control Module
Gateway ECU Power Window Master SW
with ECUShort Connector Transmission Control SW
Transmission Shift Main SW