engine TOYOTA HIGHLANDER 2001 Service Repair Manual

Explanation of Maintenance Items
37
Differential Oil
Replace at specified intervals. When performing inspections, check each
component for signs of leakage. If you discover any leakage, have it repaired
by a qualified technician immediately.
Drive Belts
Inspect for cracks, excessive wear and oiliness. Check the belt tension and
adjust if necessary. Replace the belts if they are damaged.
Drive Shaft Boots
Check the drive shaft boots and clamps for cracks, deterioration and damage.
Replace any deteriorated or damaged parts and, if necessary, repack the grease.
Selected models also require periodic inspection of the drive shaft bolt for proper
torque. A qualified technician should perform these operations.
Engine Air Filter
Replace at specified intervals. When performing inspections, check for damage,
excessive wear and oiliness, and replace if necessary.
Engine Coolant
Drain and flush the cooling system and refill with an ethyleneglycol type
coolant. Inspect the radiator, condenser and/or intercooler for leaves, dirt and
insects and clean if necessary. Inspect hoses and connections for corrosion and
leaks. Tighten connections and replace parts as necessary. A qualified technician
should perform these operations. (For further details, refer to “Radiator,
Condenser and Hoses” in the “Vehicle Maintenance and Care” section of the
Owner’s Manual.)
Note:YourToyota is equipped with Genuine Toyota Super LongLife Coolant. The
replacementintervals for engine coolant recommended in this booklet are based
on replacement with Genuine Toyota Super LongLife Coolant or similar high
quality nonsilicate, nonamine, nonborate ethyleneglycol coolant with
longlife hybrid organic acid technology (i.e., a combination of low phosphates
and organic acids). If another type of ethyleneglycol coolant is used, replacementintervals may be different.
Engine Oil and Oil Filter
Replace the oil filter and drain and refill the engine oil at specified intervals.
For recommended oil grade and viscosity, refer to the
Owner’s Manual.

Explanation of Maintenance Items
38
Engine Valve Clearance
Inspect for excessive lifter noise and engine vibration and adjust if necessary.
A qualified technician should perform this operation.
Exhaust Pipes and Mountings
Visually inspect the exhaust pipes, muffler and hangers for cracks, deterioration
and damage. Start the engine and listen carefully for any exhaust gas leakage.
Tighten connections or replace parts as necessary.
Fuel Lines and Connections, Fuel Tank Band and
Fuel Tank Vapor Vent System Hoses
Visually inspect for corrosion, damage, cracks and loose or leaking connections.
Tighten connections or replace parts as necessary.
Fuel Tank Cap Gasket
Visually inspect for cracks, deterioration and damage and replace if necessary.
Nuts and Bolts on Chassis and Body
Retighten the seatmounting bolts and front/rear suspension member retaining
bolts to specified torque.
Propeller Shaft
Lubricate the propeller shaft spiders and slide yokes with lithiumbase chassis grease
and the double cardan joint with molybdenumdisulfide lithiumbase chassis grease,
and retorque the bolt. Only a qualified technician should retorque the bolt.
Radiator Core and Condenser
Inspect for debris and signs of damage. Have any problem repaired immediately
by a qualified technician.
Spark Plugs
Replace at specified intervals. Install new plugs of the same type as originally
equipped. A qualified technician should perform this operation.
Steering Gear Box
Inspect for signs of leakage. If you discover any leakage, have it repaired imme
diately by a qualified technician.

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RR DEF Relay
5-3 : Closed with the ignition SW at ON position and rear window defogger SW on
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A1042J241 (2AZ-FE)R16B45
F738 (3MZ-FE)J543R17A45F740 (2AZ-FE)J1444
J239 (3MZ-FE)N244
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1G29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
2A
2C27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)2F27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2H
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA152Cowl Wire and Floor No.2 Wire (Left Kick Panel)
IC252Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)
IK254Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)IK354Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)
IL254Instrument Panel Wire and Cowl Wire (Upper Side of Passenger Side J/B)
BG156Back Door No.1 Wire and Floor No.2 Wire (Rear Left of the Roof)
: GROUND POINTS
CodeSee PageGround Points Location
EH48 (3MZ-FE)Under the Left HeadlightEH50 (2AZ-FE)Under the Left Headlight
BE56Left Side of Back Door
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
B956Floor No.2 Wire
Service Hints

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A10 A/C Control Assembly
2-Ground : Approx. 12 volts with the ignition SW at ON position
11-Ground : Always continuity
DEICER Relay
5-3 : Closed with the ignition SW at ON position and front wiper deicer and mirror heater SW at ON position
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A1042F540 (2AZ-FE)R2045
F538 (3MZ-FE)R1945
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
124R/B No.1 (Lower Finish Panel)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1B29Engine Room Main Wire and Instrument Panel J/B (Lower Finish Panel)
1D29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1F29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1K28Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
3A303F30Instrument Panel Wire and Center J/B (Behind the Instrument Panel Center)
3J31
()
4F33
4KCowl Wire and Passenger Side J/B (Right Side of Grove Box)4L32Cowl Wire and Passenger Side J/B (Right Side of Grove Box)
4N
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IB152Front Door LH Wire and Cowl Wire (Left Kick Panel)
IF252Instrument Panel Wire and Cowl Wire (Right Side of Instrument Panel J/B)
IK254Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)
IN154Front Door RH Wire and Cowl Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IA52Left Cowl Side Panel
IB52Right Instrument Panel Brace
IC52Right Cowl Side Panel
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E1348 (3MZ-FE)Engine Room Main WireE1350 (2AZ-FE)Engine Room Main Wire
Service Hints

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Multiplex Communication System - BEAN Bus
MPX1 MPX1
MPX1 IF3 5
IB2 1A 10B 6
MPX2 S20
8 7 10
MPX2
P 5
4F 7
Y GR Y O
GR
4O 4
34A 5IL2 12MPX-
B 2A 9
MPX+ MPX+
A 21B 9
MPX-
GG W
SB
MPX2
MPX1IL21
I 8
GR GR
GR Y
O 3* 2 : w/o Theft Deterr ent System * 1 : w/ Theft Deterrent System
* 3 : w/ Navigation System
* 4 : w/o Navigation System
3E 1
3J 12
Y
3H 5
MPX1 31
V
T 4
IB2 8
VSB(
*2)
MPD2
MPD1
G 5
11
4 V
G (
*3)
(
*3)
(
*4)B 1B2
A 1A2
MPX1 24
MPX2 22
BR BR
R
A17BR
R
BR
(
*1)
IE1 618 29
E 6
C11(
A)
, C12(
B) A10(
A)
, A11(
B) S30(
A)
, S31(
B) B 9(
A)
, B10(
B)
A/C Control Assembly
Airbag Sensor
Assembly
Body ECU
Combination Meter
Engine Control
Module
Gat ew ay ECU
Option Connector 1
Power Window Master SW
with ECU
Sliding Roof
Control ECU
Short Connector
Theft Deterr ent ECU

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The multiplex communication system communicates among the A/C control assembly, body ECU, combination meter,
engine control module, option connector 1, power window master SW with ECU, sliding roof control ECU and theft deterrent
ECU and controls the following systems according to the signals from respective sensors or switches.
Multiplex Communication System Includes Following Systems
* Air Conditioning (Automatic A/C)
* Air Conditioning (Manual A/C)
* Automatic Light Control
* Combination Meter
* Door Lock Control
* Electronically Controlled Transmission and A/T Indicator (3MZ-FE)
* Electronically Controlled Transmission and A/T Indicator (2AZ-FE)
* Engine Control (3MZ-FE)
* Engine Control (2AZ-FE)
* Headlight
* Interior Light
* Key Reminder
* Light Auto Turn Off System
* Moon Roof
* Navigation System
* Power Window
* Seat Belt Warning
* Theft Deterrent System
* Wireless Door Lock Control
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42C11A42P544
A11B42C12B42S2045
A1742E642S30A43
B9A42G543S31B43
B10B42O343T443
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
3E30
3H31Instrument Panel Wire and Center J/B (Behind the Instrument Panel Center)
3J31()
4A334F33Cowl Wire and Passenger Side J/B (Right Side of Grove Box)
4O32
g(g )
System Outline

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Multiplex communication system (CAN) uses a serial communication protocol and communicates with a differential voltage.
In this network system, TERMINALS CANH and CANL are used for communication between the ECUs and sensors, and
excellent data communication speed and communication error detecting facility are provided. This system is working for the
following system:
*VSC
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
D342J1944S2741 (2AZ-FE)
J1643S1443Y145
J1743S2739 (3MZ-FE)
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
222Engine Room R/B (Engine Compartment Left)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1D29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1G29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
2A27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
4C33
4JCowl Wire and Passenger Side J/B (Right Side of Grove Box)4L32Cowl Wire and Passenger Side J/B (Right Side of Grove Box)
4N
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IC352Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)IC452Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)
IO254Cowl Wire and Floor Wire (Right Kick Panel)
: GROUND POINTS
CodeSee PageGround Points Location
IC52Right Cowl Side Panel
BB56Right Center Pillar
BF56Near the Rear Side Marker Light RH
System Outline

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B 29
W
E 6
MPX2
18
22 24 MPX1
G125 12 3J
IB2 1
IF3 5
A 10
B 9
VY O GR
IL2 1
GR
SB
SB BR
MPX2
R PBEW
BRY
BR
4A 3E 1
G
GR4F 7IB2 87 8
P 5
MPX2
MPX1
G GR
IL2A 9
B 2MPX-
MPX+
B 2 B 1
A 2 A 1 MPX1 6
A17MPX2 MPX1
V G
21 A 9 B
VC11(
A)
, C12(
B)
S30(
A)
, S31(
B)B 9(
A)
, B10(
B)
A10(
A)
, A11(
B)
A/C Control Assembly
Airbag Sensor Assembly
Body ECU
Combination Meter
Engine Contr ol Module
Power Window Master SW
with ECU Short Connector

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Navigation System
M3 (A) Multi-Display
(A)12-Ground : Always approx. 12 volts
(A) 11-Ground : Approx. 12 volts with ignition SW at ON or ST position
(A)10-Ground : Approx. 12 volts with ignition SW at ON or ACC position
(A) 3-Ground : Always continuity
N3 (A) Navigation ECU
(A)18-Ground : Approx. 12 volts with ignition SW at ON or ACC position
(A) 9-Ground : Always approx. 12 volts
(A)17-Ground : Always continuity
G5 Gateway ECU
2-Ground : Approx. 12 volts with ignition SW at ON or ST position
9-Ground : Approx. 12 volts with ignition SW at ON or ACC position
8-Ground : Always approx. 12 volts
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42J1643R2243
A11B42J1743R2945
A1742M3A43S2345
B9A42M4B43S2739 (3MZ-FE)
B10B42M5C43S2741 (2AZ-FE)
C11A42N3A43S30A43
C12B42N4B43S31B43
D342P139 (3MZ-FE)T843
E642P141 (2AZ-FE)T1145
F1044P343
G543P544
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
222Engine Room R/B (Engine Compartment Left)
Service Hints

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: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1D29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1G29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1J28Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)1K28Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2A27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
3A
3B
3C303D30
3EInstrument Panel Wire and Center J/B (Behind the Instrument Panel Center)3FInstrument Panel Wire and Center J/B (Behind the Instrument Panel Center)
3G
3I313J31
3K
4A
4D334F33
Cowl Wire and Passenger Side J/B (Right Side of Grove Box)4HCowl Wire and Passenger Side J/B (Right Side of Grove Box)
4K324M32
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IB152Front Door LH Wire and Cowl Wire (Left Kick Panel)IB252Front Door LH Wire and Cowl Wire (Left Kick Panel)
IC352Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)IC452Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)
IF352Instrument Panel Wire and Cowl Wire (Right Side of Instrument Panel J/B)
IK254Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)IK354Engine Room Main Wire and Cowl Wire (Right Cowl Side Panel)
IL154Instrument Panel Wire and Cowl Wire (Upper Side of Passenger Side J/B)IL254Instrument Panel Wire and Cowl Wire (Upper Side of Passenger Side J/B)
IM154Engine Wire and Cowl Wire (Right Kick Panel)
IP154Instrument Panel Wire and Floor Wire (Left Side of Passenger Side J/B)
IR154Instrument Panel Wire and Floor Wire (Under the Shift Lever)
: GROUND POINTS
CodeSee PageGround Points Location
IB52Right Instrument Panel Brace