Page 2185 of 2572
'05 HIGHLANDER_U (L/O 0409)
viii
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
Tires and loading on your
To y o t a
Underinflated or overinflated tire pressure and the
excess load may result in the deterioration of
steering ability and braking ability, leading to an
accident. Check the tire inflation pressure periodi-
cally and be sure to keep the load limits given in
this Owner 's Manual. For details about tire inflation
pressure and load limits, see pages 385 and 312.
Scrapping of your Toyota
The SRS airbag and seat belt pretensioner devices in your
Toyota contain explosive chemicals. If the vehicle is
scrapped with the airbags and pretensioners left as they
are, this may cause an accident such as fire. Be sure to
have the systems of the SRS airbag and seat belt preten-
sioner removed and disposed of by the qualified service
shop or by your Toyota dealer before you dispose of your
vehicle.
Page 2186 of 2572

'05 HIGHLANDER_U (L/O 0409)
ix
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
On- pavement and off- road
driving tips
This vehicle belongs to the utility vehicle class. Utility ve-
hicles have a significantly higher rollover rate than other
types of vehicles. This vehicle will handle and maneuver
differently from an ordinary passenger car because it is
designed for off- road use also. In addition, this vehicle
has a higher ground clearance and center of gravity than
that of an ordinary passenger car. This vehicle design fea-
ture causes this type of vehicle to be more likely to rol-
lover. Failure to operate this vehicle correctly may result in
loss of control, accidents or vehicle rollover causing death
or serious injury. Be sure to read Off- road vehicle precau-
tionsº on page 290 in Section 2 and Off- road driving pre-
cautionsº on page 320 in Section 3.
Leak detection pump
(2AZ- FE engine)
This pump performs fuel evaporation leakage check. This
check is done approximately five hours after the engine is
turned off. So you may hear sound coming from under-
neath the luggage compartment for several minutes. It
does not indicate a malfunction.
Page 2187 of 2572
'05 HIGHLANDER_U (L/O 0409)
x
2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
Page 2188 of 2572
2005 HIGHLANDER (EWD592U)
1
2005 HIGHLANDER
ELECTRICAL WIRING DIAGRAM
Section Code Page
INTRODUCTION A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
HOW TO USE THIS MANUAL B. . . . . . . . . . . . . . . . . .
3
TROUBLESHOOTING C. . . . . . . . . . . . . . . . . . . . . . . . .
12
ABBREVIATIONS D. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
GLOSSARY OF TERMS AND SYMBOLS E. . . . . . . .
18
RELAY LOCATIONS F. . . . . . . . . . . . . . . . . . . . . . . . . . .
20
ELECTRICAL WIRING ROUTING G. . . . . . . . . . . . . . .
38
SYSTEM CIRCUITS H. . . . . . . . . . . . . . . . . . . . . . . . . . .
60
GROUND POINT I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
314
POWER SOURCE (Current Flow Chart) J. . . . . . . . .
322
CONNECTOR LIST K. . . . . . . . . . . . . . . . . . . . . . . . . . . .
330
PART NUMBER OF CONNECTORS L. . . . . . . . . . . . .
342
OVERALL ELECTRICAL WIRING DIAGRAM M. . . . .
346
Page 2189 of 2572

100FT-04
321 4 5
-20
020 40 60
80100 0.1 0.2 0.3 0.51 235 1020 30
Temperature C (F)
Resistance kW
(-4) (32) (68) (140)(104) (212)(176)
Air
E2
THAVG
E2G+B
A93068
12
Valve
A50377
- ENGINE CONTROL SYSTEMSFI SYSTEM (3MZ-FE)
10-13
2371 Author: Date:
INSPECTION
1. INSPECT MASS AIR FLOW METER
(a) Check the output voltage.
(1) Apply battery voltage across terminals 1 (+B) and 2
(E2G).
(2) Connect the positive (+) tester probe to terminal
VG, and negative (-) tester probe to terminal E2G.
(3) Blow air into the Mass Air Flow (MAF) meter, and
check that the voltage fluctuates.
(b) Measure the resistance between terminals 4 (THA) and
5 (E2).
Standard:
ConditionSpecified Condition
-20C (-4F)13.6 to 18.4 kW
20C (68F)2.21 to 2.69 kW
60C (140F)0.493 to 0.667 kW
If the result is not as specified, replace the MAF meter.
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
ASSY
(a) Measure the resistance between the terminals.
Standard: 6.9 to 7.9 W at 20C (68F)
If the result is not as specified, replace the OCV assy.
(b) Connect the battery's positive (+) lead to terminal 1 and
negative (-) lead to terminal 2, and check the movement
of the valve.
NOTICE:
Confirm that the valve moves freely and does not become
stuck in any position.
If necessary, replace the OCV assy.
HINT:
If the valve cannot return properly because of foreign matter, a
small pressure leak in the advanced direction may occur and a
DTC will be output.
Page 2190 of 2572

1 2 3 4 5 6
A75258
M- M+ VTA VC VTA2 E2
TemperatureC (F)
Resistance kW
30
20
10
5
2
1
0.5
0.3
0.2
0.13
-20 0 20 40 60 80 100
(-4)(32) (68) (140)(104) (212)
(176)
A91320
A65174
10-14
- ENGINE CONTROL SYSTEMSFI SYSTEM (3MZ-FE)
2372 Author: Date:
3. INSPECT ACCELERATOR PEDAL ROD ASSY
(a) Check the acceletor pedal position sensor (see page 05-469).
4. INSPECT THROTTLE BODY ASSY
(a) Check the throttle position sensor (see page 05-469).
(b) Check the throttle control motor.
(1) Measure the resistance between terminals 2 (M+)
and 1 (M-).
Resistance: 0.3 to 100 W at 20C (68F).
If the result is not as specified, replace the throttle body assy.
5. INSPECT ENGINE COOLANT TEMPERATURE
SENSOR
(a) Measure the resistance between each terminal.
Standard:
ConditionSpecified Condition
20C (68F)2.32 to 2.59 kW
80C (176F)0.310 to 0.326 kW
If the result is not as specified, replace the sensor.
NOTICE:
If checking the ECT sensor in the water, keep the terminals
dry. After the check, wipe the sensor dry.
6. INSPECT KNOCK SENSOR
(a) Measure the resistance between the terminals.
Resistance: 120 to 280 kW at 20C (68F)
If the result is not as specified, replace the sensor.
Page 2191 of 2572
A93067
5 2
1
3
1
32
5
A93067
5 2
1
3
1
32
5
- ENGINE CONTROL SYSTEMSFI SYSTEM (3MZ-FE)
10-15
2373 Author: Date:
7. INSPECT RELAY (Marking: EFI, A/F)
(a) Remove the EFI relay from the engine room J/B.
(b) Remove the A/F relay from the engine room R/B No. 2.
(c) Measure the resistance of the relay.
Standard:
Tester ConnectionSpecified Condition
3 - 510 kW or higher
3 - 5Below 1W
(when battery voltage is applied to terminals 1 and 2)
If the result is not as specified, replace the relay.
8. INSPECT CIRCUIT OPENING RELAY
(a) Remove the circuit opening relay from the R/B sub-assy.
(b) Measure the resistance of the relay.
Standard:
Tester ConnectionSpecified Condition
3 - 510 kW or higher
3 - 5Below 1W
(when battery voltage is applied to terminals 1 and 2)
If the result is not as specified, replace the relay.
Page 2192 of 2572

110UO-04
Fuel Tube Connector
A50710
Fuel Tube Connector
SST
(Hose)
B12947
SST (Hose)
SST
(Clamp)
Vinyl TubeO-Ring SST (Union)
A94173
- FUELFUEL SYSTEM (3MZ-FE)
11-41
2425 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION
1. INSPECT FUEL INJECTOR ASSY
(a) Check the injector resistance.
(1) Measure the resistance between the terminals.
Standard: 13.4 to 14.2 W at 20C (68F)
If the result is not as specified, replace the injector.
(b) Check the injector injection.
CAUTION:
This test involves high-pressure fuel and electricity.
Take every precaution regarding safe handling of
both the fuel and the electricity.
Perform this test in a safe area, and avoid any sparks
or flame.
Do not smoke.
(1) Purchase a new fuel tube and disconnect fuel tube
connector from its pipe.
Fuel tube: Parts No. 23801-20180
(2) Connect SST and the fuel tube connector to the fuel
pipe.
SST 09268-41047
CAUTION:
Always read the precautions (see page 11-35) before con-
necting the fuel tube connector (quick type).
(3) Install the O-ring to the injector.
(4) Connect SST (union and hose) to the injector, and
hold the injector and union with SST (clamp).
SST 09268-41047 (09268-41110, 09268-41300)
(5) Put the injector into a graduated cylinder.
HINT:
Install a suitable vinyl tube onto the injector to contain the gaso-
line spray.
(6) Operate the fuel pump (see page 11-38).