o2 sensor TOYOTA HIGHLANDER 2001 Service Owner's Guide

2005 HIGHLANDER (EWD592U)
107
Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock-up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock-up timing in response to
the vehicle's driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.
1. Gear Shift Operation
During driving the engine warm up condition signal is input from engine coolant temp. sensor to TERMINAL THW of the
engine control module, and the vehicle speed signal is input from the ABS speed sensor to skid control ECU, and are sent to
the engine control module through communication control. At the same time, the throttle valve opening signal is sent from
the throttle position sensor to the TERMINALS VTA1 and VTA2 of the engine control module, as the throttle angle signal.
2. Lock-Up Operation
When the engine control module decides based on each signal that the lock-up condition has been met, the current flows
through TERMINAL DSL of the engine control module to TERMINAL 10 of the electronically controlled transmission solenoid
to GROUND.
3. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on) when driving in lock-up condition, a signal is input to TERMINAL STP of
the engine control module. The engine control module operates and cuts the current to the solenoid to release lock-up.
4. Overdrive Circuit
*O/D main SW on
When the O/D main SW is turned on, a signal is input to TERMINAL ODMS of the engine control module and engine
control module operation causes gear shift when the conditions for overdrive are met.
*O/D main SW off
When the O/D main SW is turned off, a signal is input into TERMINAL ODMS of the engine control module, and turns on
the O/D off indicator light. This activates the ECU, and the transmission system is controlled not to shift to overdrive.
E4 Electronically Controlled Transmission Pattern Select SW
3-4 : Closed with the select SW at SNOW position
E5 (A), E6 (B), E7 (E), E8 (D), E9 (C) Engine Control Module
BATT-E1 : Always approx. 12 volts
MREL-E1 : Approx. 12 volts with the ignition SW ON position
P1 A/T Indicator SW
2-6 : Closed with the shift lever in P position
2-1 : Closed with the shift lever in R position
2-9 : Closed with the shift lever in N position
2-7 : Closed with the shift lever in D position
2-3 : Closed with the shift lever in 2 position
2-8 : Closed with the shift lever in L position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42E5A42P544
A11B42E6B42S1543
A1742E7E42S2739 (3MZ-FE)
B9A42E8D42S28A43
B10B42E9C42S29B43
C638 (3MZ-FE)G543S30A43
C11A42J239 (3MZ-FE)S31B43
C12B42J643T339 (3MZ-FE)
E138 (3MZ-FE)J743T1339 (3MZ-FE)
E238 (3MZ-FE)J1743T1643
E442P139 (3MZ-FE)
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
111
20 IM1
BR BR
W- B
W- B W- B W- B
BR G- BY BR
L- W
P
Y- GG Y- R R- BL- Y
9
J 6
IM1
EF EE6E 7E PL RL NL DL 2L LL
61 97382
7E 1C D 7
W- B
J 7
8B B 9 B 10 7A B 11 A 6
A
A R
BR
B- R
VC
35
VTA2 R
1 2
E 9 E 28 E18 E19
VTA1
BRE 2
4 64AP 1
54K
PR ND2 L
E2 VC THW E04 E1E03 E01 E02 C
C B
B7IM1 18 IM1 8IM1 19 IM1
J 6
Y GRL VV
L
GR
E 31VTA2
R- W
6E 21VTA1NC- NC+ NT- NT+
W- GY R- WWT 3
C 6
D 261
2
D 34 35 D 2 1
27 D
BR
A 5B 5
E2
W- BW- B W- B
BR
R
RB
W- B
4CME01
I 6
W
M- 1C 2M-
B
M+ 2C 3M+
C 17GE0 1
(
Shielded)
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
Junction
Connector
Junction
Connector
Junction
Connector
A/T Indicator SW
Shor t Connector
Turbine Speed Sensor
Throttle Control Motor T13
Throttle Position Sensor

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

2005 HIGHLANDER (EWD592U)
11 5
Previous automatic transaxle have selected each gear shift using mechanically controlled throttle hydraulic pressure,
governor hydraulic pressure and lock-up hydraulic pressure. The electronically controlled transmission, however, electrically
controls the line pressure, throttle pressure, lock-up pressure and accumulator pressure etc. through the solenoid valve. The
electronically controlled transmission is a system which precisely controls gear shift timing and lock-up timing in response to
the vehicle's driving conditions and the engine condition detected by various sensors. It makes smooth driving possible by
shift selection for each gear which is the most appropriate to the driving conditions at that time, and by preventing downing,
squat and gear shift shock when starting off.
1. Gear Shift Operation
During driving the engine warm up condition signal is input from engine coolant temp. sensor to TERMINAL THW of the
engine control module, and the vehicle speed signal is input from the ABS speed sensor to skid control ECU, and are sent to
the engine control module through communication control. At the same time, the throttle valve opening signal is sent from
the throttle position sensor to the TERMINALS VTA1 and VTA2 of the engine control module, as the throttle angle signal.
2. Lock-Up Operation
When the engine control module decides based on each signal that the lock-up condition has been met, the current flows
through TERMINAL DSL of the engine control module to TERMINAL 3 of the electronically controlled transmission solenoid
to GROUND.
3. Stop Light SW Circuit
If the brake pedal is depressed (Stop light SW on) when driving in lock-up condition, a signal is input to TERMINAL STP of
the engine control module. The engine control module operates and cuts the current to the solenoid to release lock-up.
4. Overdrive Circuit
*O/D main SW on
When the O/D main SW is turned on, a signal is input to TERMINAL ODMS of the engine control module and engine
control module operation causes gear shift when the conditions for overdrive are met.
*O/D main SW off
When the O/D main SW is turned off, a signal is input into TERMINAL ODMS of the engine control module, and turns on
the O/D off indicator light. This activates the ECU, and the transmission system is controlled not to shift to overdrive.
E4 Electronically Controlled Transmission Pattern Select SW
3-4 : Closed with the select SW at SNOW position
E5 (A), E6 (B), E7 (E), E8 (D), E9 (C) Engine Control Module
BATT-E1 : Always approx. 12 volts
MREL-E1 : Approx. 12 volts with the ignition SW ON position
P1 A/T Indicator SW
2-6 : Closed with the shift lever in P position
2-1 : Closed with the shift lever in R position
2-9 : Closed with the shift lever in N position
2-7 : Closed with the shift lever in D position
2-3 : Closed with the shift lever in 2 position
2-8 : Closed with the shift lever in L position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42E6B42S1543
A11B42E7E42S2741 (2AZ-FE)
A1742E8D42S28A43
B9A42E9C42S29B43
B10B42E1040 (2AZ-FE)S30A43
C640 (2AZ-FE)G543S31B43
C11A42J241 (2AZ-FE)T341 (2AZ-FE)
C12B42J643T1341 (2AZ-FE)
E240 (2AZ-FE)J743T1643
E442P141 (2AZ-FE)
E5A42P544
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
137
BR
R
Door
LG
MPX- 9
V GR Y
2B A IB2 8
IB2 1
IF3 5
O
7
8 MPX1
MPX2
P 5
MPX+
G V
4
11MPD1
MPD2
G 5SB
74F 54A
(
*3) (
*3)
G
(
*4)
G
SBY
13E 12 3J G
IB 21 A 9 B A12 A2 A
5V 1
R
11 A
3B 12
3K 2
LG V
33D 93F
LGPB
73C
43A 13 1K 10A
HEATER
BR
7V
BR
R
IL2 121B 2B 2A 1A
BR BR
MPX1
24 22MPX2 A17LG
SB
O
BR
R
W- BW- B
W- B From Power Source System (
See Page 62)
S30(
A)
, S31(
B)
C11(
A)
, C12(
B)
A10(
A)
, A11(
B)
A/C Control Assembly Airbag Sensor Assembly
Combination Meter
Gat ew ay EC U Power Window Master SW
with ECU
Shor t Connector

2005 HIGHLANDER (EWD592U)
146
Automatic Light Control
40A
MAIN
12
C13
Di mmer SWLight
Control SWFlashHighLow HeadTail OFF13 814
16 Auto
IAB 16 B 17 B 18 B 15 3
IK3 4
C 37. 5A
RAD
NO. 2
1J 6
A 21 A 20 A 12 52134 31
A 173C 63A 8
W B RL-R
G
W
R
7. 5A
IG1
1K 10
A 53B 53A 10
GR BR
7. 5A
ECU- B
2A 4
D 91H 61G 10
W- L G
C 11
1IC3 5
BR
A23
D 7
LG
P V OB B
W- BDRL NO. 2
Relay
HRLY ACC IG BECU CLTB CLTE CLTSCLTB CLTE CLTS
A HEAD TAIL HF DCTY2
3 3
3
R- B
2G 4
E10
R- B
R- B
A 7
TRLY
SB
1
1A 1
B
2
1
F 7 Battery
FL MAIN
3. 0W
W140A ALT
2I 1
W W
TAILLIGHT
Relay
51
32
1J 4
3
B
IA1 9From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)Automatic Light Control Sensor
Body ECU
Combi nati on SW
Door Courtesy SW
Front LH
Fusible Link Block

2005 HIGHLANDER (EWD592U)
155
SRS
NOTICE: When inspecting or repairing the SRS, perform service in accordance with the following precautionary instructions
and the procedure, and precautions in the Repair Manual applicable for the model year.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.

Work must be started more than 90 seconds after the ignition SW is turned to the ºLOCKº position and the
negative (-) terminal cable is disconnected from the battery.
(The SRS is equipped with a back-up power source so that if work is started within 90 seconds from
disconnecting the negative (-) terminal cable of the battery, the SRS may deploy.)

When the negative (-) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
cleared. So before starting work, make a record of the contents in the audio memory system. When work is finished,
reset the audio systems as they were before and adjust the clock. Some vehicles have power tilt steering, power
telescopic steering, power seat and power outside rear view mirror which are all equipped with memory function.
However, it is not possible to make a record of these memory contents. So when the work is finished, it will be
necessary to explain it to your customer, and ask the customer to adjust the features and reset the memory. To avoid
erasing the memory in each system, never use a back-up power supply from outside the vehicle.

Before repair, remove the airbag sensor if shocks are likely to be applied to the sensor during repair.

Do not expose the following parts directly to hot air or flame;

Even in cases of a minor collision where the SRS does not deploy, the following parts should be inspected;

Never use SRS parts from another vehicle. When replacing parts, replace with new parts.

For the purpose of reuse, never disassemble and repair the following parts.

If the following parts have been dropped, or have cracks, dents and other defects in their case, bracket, and connector,
replace with new one.

Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting electrical circuits of the system.

Information labels are attached to the periphery of the SRS components. Follow the instructions of the notice.

After work on the SRS is completed, check the SRS warning light.

If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.
*Steering wheel pad
*Front passenger airbag assembly
*Side airbag assembly
*Curtain shield airbag assembly
*Seat belt pretensioner
*Center airbag sensor assembly
*Front airbag sensor assembly
*Side airbag sensor assembly

2005 HIGHLANDER (EWD592U)
156
SRS
10A
IGN
1L 6
B 5 B 10 B11
IG2 P+ P- 12
Y- B
Y
B 8B7
P2+ P2- 34
Y- R
Y- G
2 1
Y- B
Y
P132 1C 9C10
Y- B
Y
P14 PL+ PL- PR+ PR-
2 1B 14 B13
Y- B
Y
A20D+ D-
3 4B 16 B17
Y- R
Y- G
D2+ D2-
1 2B 15 B26
G
R
A 8+SL - SL
IK1 2IK11
W- R
BR
+SL - SL1 2B 9B20
+SR
W
B
A 9+SR - SR
IK1 3IK14
B- W
BR- W
-SR
BB
20 A A 17 A16 A18
SSL+ SSL- VUPL ESL
G
R
W
B
3241S16
1 4 2 3
B WR G
ESR VUPR SSR- SSR+15 C 17 C 16 C C13 S17 1G 6
P
SSL+ SSL- VUPL ESL SSR+ SSR- VUPR ESRP
A19
A 8
A 2A 7
A 1 4E1
4M4
C 56C(
*3)
(
*4)
(
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3)
A16(
A)
, A17(
B)
, A18(
C) From Power Source System (
See Page 62)
Airbag Sensor
Fro nt LHAirbag Sensor
Fron t RHAirbag Sensor Assembly Airbag Squib
(
Front Passenger Air bag Assembly)
Airbag Squib
(
Steering Wheel Pad)Pretensioner LH Pretensioner RH Side Airbag Sensor Front LH Side Airbag Sensor Fr ont RH

2005 HIGHLANDER (EWD592U)
157
C 18 C4C19 C20
CSR+ CSR- VUCR ESCR
R
G
W
B
3241S33
1A A 15 A14 A13
CSL+ CSL- VUCL ESCL
R
G
W
B
3241S32
2 1A 12 A11
Y- B
Y
S182 1C 5C6
Y- B
Y
S19 SFL+ SFL- SFR+ SFR-
7C 8C
12
C18
Y- BY
10 A 9A
12ICR- ICR+ ICL- ICL+
C19
Y- BY
W
B
G
R
LSP+
LSP- LBE+ LBE- CSL+ CSL- VUCL ES CL CSR+ CSR- VUCR ESCR
(
*1 *3)
(
*1 *3) (
*1 *3) (
*1 *3) Y
Y- B
BK2 2 BK21
(
*2 *3) Y- B (
*2 *3) Y
2413 * 1 : w/ Rear Seat Entertainment System
* 2 : w/o Rear Seat Entertainment System
W- B
E2
B 28
IA 1L 1
1D 14
W- B
PP
B19
GND VS
A 3A 4
A 8A 3
A 11A 19
A 6(
*4) A 2(
*3)
(
*3)
(
*3)
W- B
E1
B 27
1L 9 * 3 : w/ Curtain Shi eld Airbag
* 4 : w/o Curtain Shield Air bag
(
*3)
(
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3)
(
*3)
(
*3) (
*3)
A16(
A)
, A17(
B)
, A18(
C)
Airbag Sensor Assembly
Buckle SW LH
Seat Position Airbag
Sensor LH
Curtain Shield Airbag
Squib LHCurtain Shield Airbag
Squib RH Side Airbag
Squib LHSide Airbag
Squib RH Side Airbag Sensor Rear LH Side Airbag Sensor Rear RH

2005 HIGHLANDER (EWD592U)
158
SRS
7B 12
BR
D 3SIL
SIL1L 3
1E 3
4M 1
4A 12
W P
B 22
MPX2
BR
R
* 5 : w/ Navigation System
* 6 : w/o Navigation System
B 6
V
SVC4
B 10
B
SIG4
B 4
BR
SGD4
123
SVC4 SIG4 SGD4
O11 SGD2 SIG2 SVC23 2 1B 12
W
SVC2
B 8
L
SIG2
B 2
O
SGD2
O 9B 11
SVC1
R
SVC1
1
B 7
SIG1
SB
SIG1
2
B 1
SGD1
G
SGD1
3
B 5
SVC3
GR
SVC3
1
B 9
SIG3
Y
SIG3
2
B 3
SGD3
W
SGD3
3
1 2A 9
L
BSW
A 5
GR
BGND
B17BR
C 1
FSR+
W
C 2
FSR-
B
A 4
FSR-
B
A 8
FSR+
W
BL1 4BL11
A 7
IG
BR
A 1
+B
R
6BL1 BL15 IO2 5IO211
G
PP
P
P
P
O 8 O10
A 2
V
DIA
A 3
W- B
GN D
IO2 4BL1 2BL13
R
W- B
C C
BFJ18
W- B
A
A
PJ16
AE E
J17
B 2B1
A 2A1
B 24
MPX1
BR
P
B 1
L
P- AB
1L 2
1K 5
B
PAON
25
Y
B
1L 8
1E 11
G
IL1 14
W
L
WBR
R
EE
J 6 P
(
*4) (
*3)
C 3C10* 3 : w/ Curtain Shield Airbag
* 4 : w/o Curtain Shield Airbag
S30(
A)
, S31(
B)
A16(
A)
, A17(
B)
, A18(
C)
O 6(
A)
, O 7(
B)
Airbag Sensor Assembly
Buckle SW
(
Front Passenger' s Side)
Data Link Connector 3Junction
Connector
Junction
Connector
Junction
ConnectorJunction
ConnectorOccupant Classification ECUOccupant Classification
Sensor Front LH
Occupant Classification
Sensor Front RHOccupant Classi fication
Sensor Rear LH
Occupant Classi fication
Sensor Rear RH
Short Connector