Page 2257 of 2572
Replace crankshaft position sensor. CHECK RESISTANCE OF CRANKSHAFT POSITION
Standard:Cold Hot
985 to 1,600 W1,265 to 1,890 W
CHECK IGT SIGNAL FROM ECM
REPAIR WIRING BETWEEN IGNITION COIL AND ECM
OKNG
NG SENSOR (See page 18-6)
OK (See page 05-174)Check ECM (see page 05-32).
OK Continued from previous page 18-2
- IGNITIONIGNITION SYSTEM (2AZ-FE)
2862 Author: Date:
(8) Using a 16 mm (0.63 in.) plug wrench, install the spark plugs.
Torque: 19 NVm (194 kgfVcm, 14 ftVlbf)
(9) Install the ignition coils.
Torque: 9.0 NVm (92 kgfVcm, 80 in.Vlbf)
(10) Install the engine cover No. 1.
Torque: 9.0 NVm (92 kgfVcm, 80 in.Vlbf)
Page 2258 of 2572

100FS-06
10-12
- ENGINE CONTROL SYSTEMSFI SYSTEM (3MZ-FE)
2370 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
SFI SYSTEM (3MZ-FE)
ON-VEHICLE INSPECTION
1. CHECK THROTTLE BODY
(a) Listen to the throttle control motor operating sounds.
(1) Turn the ignition switch ON.
(2) When pressing the accelerator pedal position sensor lever, listen to the running motor. Make sure
no friction noise comes from the motor.
If friction noise exists, replace the throttle body.
(b) Inspect the throttle position sensor.
(1) Connect the hand-held tester or OBD II scan tool to the DLC3.
(2) Turn the ignition switch ON.
(3) Check that the MIL is off.
(4) Under CURRENT DATA, the throttle valve opening percentage (THROTTLE POS) should be
within the standard value range below.
Standard throttle valve opening percentage:
60 % or more
If the percentage is less than 60 %, replace the throttle position sensor.
NOTICE:
When checking the standard throttle valve opening percentage, the transmission should be in the
neutral position.
2. CHECK ACCELERATOR PEDAL POSITION SENSOR
(a) Turn the ignition switch ON. Under CURRENT DATA, the voltage of the throttle position sensor should
be within the standard value range below.
Standard: 0.6 to 1.0 V
If the result is not as specified, replace the accelerator pedal position sensor.
3. CHECK CAMSHAFT TIMING OIL CONTROL VALVE (OCV) ASSY
(a) Connect the hand-held tester or OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON.
(c) Start the engine and warm it up.
(d) Select the VVT from the ACTIVE TEST menu.
(e) Check the engine speed when the OCV is operated by the hand-held tester or OBD II scan tool.
Standard:
ConditionSpecified Condition
VVT system is OFF (OCV is OFF)Normal engine speed
VVT system is ON (OCV is ON)Rough idle or engine stalled
If the result is not as specified, replace the OCV assy.
Page 2259 of 2572

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
34
2 1
1 HIGHLANDER
2ACC
IG1
IG2
ST2 AM1 4
Engine Cont rol Module
<2- 8><3- 6><3- 7> 6
8 7AM2
W- R(
*1)
B
W1C 6
1A 1
10
Engine Cont rol
Module< 2- 7> < 3- 6>
140A ALT2
W- R W- R 2 1
3 5
22
1A
B1N P
41F 6
W- R 1C 4
EFLeft Side of
Cy linder Block 1IC3 1
W- R STARTER
Relay
42 42 42 42 42 42 13 13 13 13 13 13
BB
GR
B- WW L- Y
W- B W- B W- B W- B RRRRR(
*1)
WYORR R- L(
*1) R P R Y- BR L- Y R(
*1) G- Y(
*1) R(
*1) L- R(
*1)
W- B W- R W- B W- R W- B W- R W- B W- R W- B(
*1) W- G(
*1) W- B(
*1) W- R(
*1)
W- B
BRW- R W- R
Starting and Ignition Power Source
15A IG2
40A AM1
12
1
EC Left Side of
the Cylinder Head 2 2 2IC1 1IC1
30A AM2
2 2
7. 5 A ST ARTER
3W
4 EB13 EB2
L
Engine Contr ol
Module< 2- 6> < 3- 8>
FL MAIN
3. 0W W- RB- R
B- W
1
1C1
1G GR
* 1 : 3MZ- FE
* 2 : 2AZ- FE
W- B
(
*1) (
*2)
1
2
(
*1)
(
*1) G
Under the
Left HeadlightEH A ST1
3IC1 B 1BB-Y
P 1
5 4 EB2
B- R
L- W
B
Engine Control
Module<2- 6><3- 8>B- R
BB
B- WW- B
2EB1
BRW- R
R- W(
*2)
4A
4BA
B
C
(
Cont. next page)
W
W
G
I15
J 2 F 7
S 1(
A)
, S 2(
B)
S28(
A)
, S29(
B)
I 2 I 3 I 4 I 5 I 6 I 7
N 1
Fusible Link Block
Ignition Coil and
Igniter No. 1 Ignition Coil and
Igniter No. 2 Ignition Coil and
Igniter No. 3 Ignition Coil and
Igniter No. 4 Ignition Coil and
Igniter No. 5 Ignition Coil and
Igniter No. 6
Ignition SW
Junc tion
Connec tor
Noise Filt er
(
Ignition System)
Park/Neutral
Position SW
Starter
Short Connector GND IGF GND IGF I GFGND GND IGF IGFGN D GN D I GF +B IGT +B IGT I GT+B +B I GT I GT+B +B I GT
Page 2260 of 2572
2005 HIGHLANDER (EWD592U)
M
78
6 5
1 HIGHLANDER (
Cont' d)
4A
L
1 A
2 A
1 B S
IG
B1B 51C 7
8EB2
W- LR W
R- B 10A ECU- IG
Charging
2H 12I 1
7. 5A ALT- S
10 EB2
W- L WG
W- LR
A
B
C
1K 13
10 A HEAT ER
111
BCh ar g e
3B 12
3K 2
IBRi g ht I ns t r u me nt
Panel Br aceRBR
21 C 29 B 18 B
Multiplex Communication
System (
BEAN Bus)
<20- 3>
RL MPX2 MPX1
W- G3C 7 3A 4
P
W
W
G
E 6(
B)
, E 9(
C)
C11
G 1(
A)
, G 2(
B)
Combination Meter
Engine Cont rol Module
Ge ne r at or
Page 2261 of 2572

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1
234
2 HIGHLANDER(
Cont. next page)
Engine Control (
3M Z- FE)
Power Source
YB- WW
EFI
RelayD
W IC1 4
RW
G
LGIC3 6
R
W
WW
1
2
2 2
B- W
R
R
R R
A
B
6 7
L Y B W
CIRCUIT OPENING
Relay
R- W
B- WGY B
W- B
P- L
W- B L
W
BR
Y
W
K
P- L
G
R- WB- W
W
B
Y
LR R R R R 1
2
Y
G
W
W
WL- Y
QP ON MLJ C
IK3 13
A
Under the Left
HeadlightEH 52B 52G
32D 82B 42F5
3 1
2
Lef t Side of
Rear Cross MemberBCM 4
51 11 1
5 1
23 4E 1
61G
A/ F Rel ay2 2 2
2 1
3 5
R R R
5EB1
2
1 2
1 2
1 2
1 2
1 2
1 91G 41C 11G 11C
12I
20A
EFI NO. 1
2 GR
2
IC1 1
3
1
30A AM2
140A ALT
2W
10
Bat tery FL MAIN
3. 0W4M 4
7. 5A OBD
1E 10
1A 1BW
22B 72
2 1 2F B- W
B- W
G
2IC2
B
2A 7
W- BW- BP- L
14FB P
P
2B 4E W 2ACC
IG1
ST1
IG2
ST2 AM1 4
AM2
10A ETCS25A A/ F 15A IG2 10A IGN 10A EFI NO. 2
W40A AM1
1C 6
G10A HEATER1C 7
1K 13 G
73C
43A
BH P
Cruise Malfunction
Indicator Lamp11 A 4 B1A 13A
10 IL2 3B 12
3K 2I SB 9IL1
IB Right Instrument
Panel Brace
BR SB
PRL
P W
P
1 2
8IA2
W
B B B- W B- W
W
I15
F 7
I 8 I 9
I10
I11
I12
I13 C1 1(
A)
, C12(
B)
J 2
F12 Combination Meter
Fusible Link Block
Fuel Pump
Injector No. 1 Injector No. 2
Injector No. 3
Injector No. 4 Injector No. 5 Injector No. 6
Ignition SW
Junction
Connector
Page 2262 of 2572

2005 HIGHLANDER (EWD592U)
M
3
IK2 10
L- B
GRL- W
B- R
2
30 W
E
R
V
B- RD
5
IM1 5
R
1
BJ1 18B
5IO1
W- B
78
6 5
(
Cont. next page)
2 HIGHLANDER (
Cont' d)
E ngine C ontrol (
3MZ- FE)
29
STARTER Fuse
<1- 2>
Park/Neutral Posit ion SW
<1- 2>NS W STA
B B- R RSB
W- B
EB1
CCV
LE 27 1
2 B- W
B
Y
G
B- WP
R- W
W
B
Y
L A
B
D
G
VG
J
K E
L
M
N
O
P
QD 35E4EE32E1E 8A 10A20
THA 2A 1A
B- W
3AE E 16 E 17
W
Y
E2 G
G B- WWB YL2 1
2 1
2 1
6CE 15 34 E EB2 7B- W B- R B- R
BR- YG
33 D
W
A
B
C 21 6B
W+BM
W
RRL +B 2 +B B AT T
Air Conditioning Sys tem
<34- 8><35- 8>B 2
B- R
B- R
W- L2B- R
E R- W
GR
Y- GBR
8C
L- W
8E
R- L
9E
P10 E
Y- B11 E
L- Y12 E
G- Y13 E
L- R
I gnit ion Coil and I gniter s
<1- 3><1- 4> E
FAN NO. 2 Relay
<32- 3>
MREL FC #60 #50 #40 #30 #20 #10ACMG CF IGT1 IGT2 IGT3 IGT4 IGT5 IGT6 ACMACI S PRG HT2 B
Charging Sy stem
<1- 5>
11 IK21
29 D
BOX 2B3(
Shielded)
4 B- W CW W
C
IO1 16 F
BJ1 14
GR
1
B- W
STP
19 B
Electronically Controlled Transmission
and A/T I ndic ator Sys tem
<13- 2>
27 D 35 D 26 D 34 D
Elec tr onic ally
Controlled
Transmission and
A/T Indicator System
<13- 5>
NT- NT+ NC+ NC-
IGF1
Ignition Coil and Igniters
<1- 3> W- RE 24 GR
W
B- R B- R B- RGR
B- R B- W
9A
IGSW 12 B
ST 1-E E
HEE
P
2
1
Stop Light
System< 9- 1>SB
I11 AW4F BR
BR
P
PVP
4 3
14 IM1
W
V 5
S15 V1 4
J 3
H 6
V 4
V 2
M 1FAN NO. 1 Relay
<32- 3>
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
Engine Cont rol Module
Heated Ox ygen Sensor
(
Bank 2 Sensor 2)
Junction
Connector
Mass Air Flow Meter
Stop Light SW VSV (
ACIS No. 2) VSV (
EVAP)
VSV (
ACM) VSV
(
Canis ter Closed Valve)
E2 +B +B E1
VG E2G THA
HT OX
Page 2263 of 2572

2005 HIGHLANDER (EWD592U)
M OVERALL ELECTRICAL WIRING DIAGRAM
1
W- BW- BG- B L
BJ1 VTA1 VCVTA2 E2
12
BRBI1 13 IM1
3M- M+12
IM1
1112
10 9
(
Cont. next page)
2 HIGHLANDER (
Cont' d)
E ngine C ontrol (
3MZ- FE)
E(
Shielded) R- W
GR B
C
12
IO1 3 D
6
25 D 21 D24 13
BRB
R- Y
VTA2 VC18 E 315D 22D A20 13 24D
D 3EB1
30 D 4 D 23 D D31 13 24 6EB1
17 C 3 C 21 E2 1
19 E 21 A C
2 1 16 C 15 C
2 1 14 C 13 C 4 W- B
B- WBRY
GRWB- R
YA
B
D
E
PLL
HT1B OX1B HA1H A1A+ A1A- HA2A A2A+ A2A- TC 2
G- WG- RL- R G- B
W
G- R G- B
OC2+ GE01 M+ VTA1 THW PTNK
OC 1+ OC 1 - OC2 - E(
Shielded)
(
Shielded) O
O
BRR- W
5
B- R R- W
IM1 (
Shielded)
6
M-IM1 3
(
Shielded)
W
F AW
(
Shielded)
BJ 1 16
3BI1IO1 15
2IM1
BR G- RBYL
WB R- WB- R Y
WB R- WB- RY3 Y
1 W- B
2 BR BR
1 22 C
EC Left Side of the
Cylinder Head7E 6E
Y- B W- B W- BMOPS E01 E02
1 10 CPSW
R- W
(
Shielded)
C
12 A
Voltage Inv ert er
< 27- 4>ELS2G
DMulti- Display
<30- 6>
R- W R- W
W- BIO17
PL
17 BJ1
BR2BI1Y
O
FBR
5A
5B
E 28
E2
BR BR BRR- W
BR
BR
4C
W- BME01
W- B (
*1)
(
*2)
* 2 : w/ Rear Seat Ent ert ainment Sys tem * 1 : w/ Navigation Syst em
O 1
P 2 E 2
V11
S28(
A)
, S29(
B)
T13
A 7
A 6
H10 J16
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)
C 3
C 4 Air Fuel Ratio Sens or
(
Bank 1 Sens or 1) Air Fuel Ratio Sens or
(
Bank 2 Sens or 1)
C amsh af t Ti mi ng Oi l
Control Valve LH
C amsh af t Ti mi ng Oi l
Control Valve RH
Engine Coolant
Temp. Sensor
Engine Contr ol Module
Heat ed Oxy gen Sens or
(
Bank 1 Sensor 2) Junction
Connec tor
Oil Pressure SW
Power Steering Oil
Pressure SW
Short Connector
Throttle Control Motor
Vapor Press ur e Sens orVCC GND PTNK+B E2
+B AF- +B AF-
AF + HT AF+ HT OX 1B HT1B Thrott le Posit ion Sensor
Page 2264 of 2572

2005 HIGHLANDER (EWD592U)
M
1516
14 13
(
Cont. next page)
2 HIGHLANDER (
Cont' d)
(
Shielded)
(
Shielded)
(
Shielded) O
E ngine C ontrol (
3MZ- FE)
A
B
D
E
ED Rear Side of
Cylinder Head6D 7D 26 C 25 C C24 27 CIM1
A A
A
A
A
AA
A
A
L R R GL B- W
(
Shielded) (
Shielded) (
Shielded)VV2+ NE+ NE- VV1+ EKN2(
Shielded)
(
Shielded)
(
Shielded)
(
Shielded)
(
Shielded)BR
(
Shielded)
BR RR
7C
W- B W- B
W- B
W- BE03 E05 E04B
D O
R
BR
G
G C
(
Shielded)
D28D 1 20 D 2D1EA1 2 3 EA1 4EA1
KNK2 KNK1 EKNKEA1
W
B
G
R R GB W
C W- B
F
B
G A
5ATACH
18 ASIL
19 AWFSE
E
R V
R
B
15 A
EOM
W- B
A W
30 AENG-
25 ATRC+
31 ATRC-
17 ANE O
R Y GB
24 AENG+
V
Skid Control ECU
wit h Act uat or
<15- 5> FW
1 2
1 2
2 1
26 A 22 A 28 A 27 A 23 A 29 A
VCPA VPA EPA VCP2 VPA2 EPA2 EPA2 YPA2 VCP2 EPA VPA VCPA
231564
BRWL R
B G Elec tronic ally Cont rolled
Transmis sion and A/T
Indicator System< 13- 4>
D 10 B 17 B
YSPD 9IL2Y
CANCEL
- SET
+R E S
ON - OFF
LG
24 BCCS
Cruise Control (
3M Z- FE)
26 BIMO
V
27 BIMI
B Combination Meter
< 31- 4>
29 B 18 BMPX1 MPX2
Multiplex Communication
Sy st em (
BEAN Bus)
< 20- 3>
1 2
1 2
V
(
Shielded)
1E
E1
BR
A
A4
17 IM1 BRBR
5 4
OLG Cr uis e Cont rol SW
K 3
V 7
C 7
V 6
J 7
A27
K 2C1 6
E 5(
A)
, E 6(
B)
, E 7(
E)
, E 8(
D)
, E 9(
C)Accel Position SensorCrankshaft
Pos ition Sens orCombinat ion SWEngine Contr ol ModuleJunct ion
Connect or
Knock Sens or
(
Ba nk 1)
Knock Sens or
(
Ba nk 2)
VVT Sens or LH VVT Sens or RH
Transponder Key Computer
<4- 3>