TOYOTA HIGHLANDER 2001 Service Repair Manual

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Engine Control for 3MZ-FE
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 is detected by the VVT sensors and its signal is input to TERMINALS VV1+ and VV2+ of the engine
control module as a control signal. Also, engine RPM is detected by the crankshaft position sensor and is input as a
control signal to TERMINAL NE+.
(5) Throttle position signal circuit
The throttle control motor and 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 sensors and the signal is input into TERMINALS KNK1 and KNK2 as a control
signal.
(11) Air fuel ration signal circuit
The air fuel ration is detected and input as a control signal into TERMINALS A1A+ and A2A+ 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 TERMINALS OX1B and OX2B 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 the engine control module (HT1B and HT2B).
(13) Fuel cut in a collision
The system receives the collision signal from 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

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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 #10, #20, #30, #40, #50 and #60 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, IGT4, IGT5 and IGT6. This
signal controls the igniter to provide the best ignition timing for the driving conditions.
*ACIS
The ACIS includes a valve in the bulkhead separating the surge tank into two parts. This valve is opened or closed
according to the driving conditions to control the intake manifold length in three stages, for increased engine output in all
ranges from low to high speeds, when idling.
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
Voltage at engine control module wiring connector
BATT-E1 : Always 9.0-14.0 volts
VC-E2 : Always 4.5-5.5 volts (Ignition SW at ON position)
VG-E2G : 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)
IGF-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-E1 : 9.0-14.0 volts (Ignition SW at ON position)
0-3.0 volts (Engine idling)
SPD-E1 : Pulse generation (Ignition SW on and rotate driving wheel slowly)
W-E1 : 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)
TC-E1 : 9.0-14.0 volts (Ignition SW at ON position)
STP-E1 : 7.5-14.0 volts (Ignition SW on and brake pedal depressed)
0-1.5 volts (Ignition SW on and brake pedal depressed)
PTNK-E1 : 3.0-3.6 volts (Ignition SW at ON position)
1.3-2.1 volts (Ignition SW on and apply vacuum 2.0 kpa)
OX1B, OX2B-E1 : Pulse generation (Maintain engine speed at 2500 rpm for two minutes after warming up)
KNK1, KNK2-E1 : Pulse generation (Engine idling)
IGT1, IGT2, IGT3, IGT4, IGT5, IGT6-E1 : Pulse generation (Engine idling)
#10, #20, #30, #40, #50, #60-E01 : 9.0-14.0 volts (ignition SW at ON position)
Pulse generation (Engine idling)
Service Hints

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Engine Control for 3MZ-FE
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A638 (3MZ-FE)E9C42P139 (3MZ-FE)
A738 (3MZ-FE)F1244P239 (3MZ-FE)
A10A42G138 (3MZ-FE)P544
A11B42G543S1543
A1742H638 (3MZ-FE)S2739 (3MZ-FE)
A2742H1043S28A43
B9A42I839 (3MZ-FE)S29B43
B10B42I939 (3MZ-FE)S30A43
C338 (3MZ-FE)I1039 (3MZ-FE)S31B43
C438 (3MZ-FE)I1139 (3MZ-FE)T339 (3MZ-FE)
C638 (3MZ-FE)I1239 (3MZ-FE)T1339 (3MZ-FE)
C738 (3MZ-FE)I1339 (3MZ-FE)T1443
C11A42J239 (3MZ-FE)V239 (3MZ-FE)
C12B42J339 (3MZ-FE)V439 (3MZ-FE)
D342J743V539 (3MZ-FE)
E238 (3MZ-FE)J1643V639 (3MZ-FE)
E5A42K239 (3MZ-FE)V739 (3MZ-FE)
E6B42K339 (3MZ-FE)V1145
E7E42M139 (3MZ-FE)V1445
E8D42O139 (3MZ-FE)V1545
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
124R/B No.1 (Lower Finish Panel)
222Engine Room R/B (Engine Compartment Left)

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: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CodeSee PageJunction Block and Wire Harness (Connector Location)
1E29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)1G29Cowl Wire and Instrument Panel J/B (Lower Finish Panel)
1K28Instrument Panel Wire and Instrument Panel J/B (Lower Finish Panel)
2A
2B
2D27Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2F
gg(g)
2G
3A
3B
3C303D30
Instrument Panel Wire and Center J/B (Behind the Instrument Panel Center)3EInstrument Panel Wire and Center J/B (Behind the Instrument Panel Center)
3F
3J313K31
4A
4C
4D
4E33
4FCowl Wire and Passenger Side J/B (Right Side of Grove Box)4GCowl Wire and Passenger Side J/B (Right Side of Grove Box)
4H
4L
4M32
4N
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
EA148 (3MZ-FE)Engine Wire and Sensor Wire (Right Side of Cylinder Head)
EB148 (3MZ FE)Engine Wire and Engine Room Main Wire (Front Side of Engine Room R/B)EB248 (3MZ-FE)Engine Wire and Engine Room Main Wire (Front Side of Engine Room R/B)
IA152Cowl Wire and Floor No 2 Wire (Left Kick Panel)IA252Cowl Wire and Floor No.2 Wire (Left Kick Panel)
IB252Front Door LH Wire and Cowl Wire (Left Kick Panel)
IC1
IC252Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)IC352Engine Room Main Wire and Cowl Wire (Left Cowl Side Panel)
IC4
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)
IO154Cowl Wire and Floor Wire (Right Kick Panel)
BI156Floor No.4 Wire and Fuel Tank Wire (Right Side of Rear Floor Crossmember)
BJ156Floor Wire and Floor No.4 Wire (Right Side of Rear Floor Crossmember)

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Engine Control for 3MZ-FE
: GROUND POINTS
CodeSee PageGround Points Location
EC48 (3MZ-FE)Left Side of Cylinder Head
ED48 (3MZ-FE)Rear Side of Cylinder Head
EH48 (3MZ-FE)Under the Left Headlight
IB52Right Instrument Panel Brace
IC52Right Cowl Side Panel
BC56Left Side of Rear Cross Member
: SPLICE POINTS
CodeSee PageWire Harness with Splice PointsCodeSee PageWire Harness with Splice Points
E6I654Engine Wire
E748 (3MZ-FE)Engine WireI7
E14
()g
I854Cowl Wire
E1648 (3MZ-FE)Engine Room Main WireI9

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MEMO

'05 HIGHLANDER_U (L/O 0409)
11 9
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
OPERATION OF INSTRUMENTS AND
CONTROLS
Lights, Wipers and Defogger
Headlights and turn signals120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency flashers123 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument panel light control123 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front fog lights124 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior lights124 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Personal lights125 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition switch light126 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield wipers and washer127 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear window wiper and washer128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear window and outside rear view mirror defoggers and windshield
wiper de- icer128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1- 5

'05 HIGHLANDER_U (L/O 0409)
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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)

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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
High- Low beamsÐFor high beams, turn
the headlights on and push the lever away
from you (position 1). Pull the lever to-
ward you (position 2) for low beams.
The headlight high beam indicator light
(blue light) on the instrument panel will
tell you that the high beams are on.
Flashing the high beam headlights
(position 3)ÐPull the lever all the way
back. The high beam headlights turn off
when you release the lever.
You can flash the high beam headlights
with the knob turned to OFFº.TURN SIGNALS
To signal a turn, push the headlight/
turn signal lever up or down to position
1.
The key must be in the ONº position.
The lever automatically returns after you
make a turn, but you may have to return
it by hand after you change lanes.
To signal a lane change, move the lever
up or down to the pressure point (position
2) and hold it.
If the turn signal indicator lights (green
lights) on the instrument panel flash faster
than normal, a front or rear turn signal
bulb is burned out. See Replacing light
bulbsº on page 400 in Section 7- 3.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
The lights automatically turn off when the
driver 's door is opened with the ignition
turned off. 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 head-
light switch is off.
Headlights and turn signals
(without automatic light
control system)

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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
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.
High- Low beamsÐFor high beams, turn
the headlights on and push the lever away
from you (position 1). Pull the lever to-
ward you (position 2) for low beams.
The headlight high beam indicator light
(blue light) on the instrument panel will
tell you that the high beams are on.
Flashing the high beam headlights
(position 3)ÐPull the lever all the way
back. The high beam headlights turn off
when you release the lever.
You can flash the high beam headlights
with the knob turned to OFFº.TURN SIGNALS
To signal a turn, push the headlight/
turn signal lever up or down to position
1.
The key must be in the ONº position.
The lever automatically returns after you
make a turn, but you may have to return
it by hand after you change lanes.
To signal a lane change, move the lever
up or down to the pressure point (position
2) and hold it.
If the turn signal indicator lights (green
lights) on the instrument panel flash faster
than normal, a front or rear turn signal
bulb is burned out. See Replacing light
bulbsº on page 400 in Section 7- 3.