1998 TOYOTA LAND CRUISER Factory Repair Manual

child lock handbrake maintenance schedule child restraint coolant temperature start stop button

Page 2241 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
234VSC
1. ABS Operation
If the brake pedal is depressed suddenly, the ABS controls the hydraulic pressure of the wheel cylinders for all the four
wheels to automatically av

2004 LAND CRUISER (EWD548U)
234VSC
1. ABS Operation
If the brake pedal is depressed suddenly, the ABS controls the hydraulic pressure of the wheel cylinders for all the four
wheels to automatically avoid wheel locking and ensure the directional and steering stability of the vehicle. If the brake pedal
is depressed suddenly, the ABS & BA & TRAC & VSC ECU controls the solenoids in the actuators using the signals from the
sensors to move the brake fluid to the reservoir in order to release the braking pressure applied to the wheel cylinder. If the
ABS & BA & TRAC & VSC ECU detects that the fluid pressure in the wheel cylinder is insufficient, the ECU controls the
solenoids in the actuators to increase the braking pressure.
2. Traction Control Operation
The traction control system controls the engine torque, the hydraulic pressure of the driving wheel cylinders, slipping of the
wheels which may occur at start or acceleration of the vehicle, to ensure an optimal driving power and vehicle stability
corresponding to the road conditions.
3. VSC Operation
Unexpected road conditions, vehicle speed, emergency situation, and any other external factors may cause large under- or
over-steering of the vehicle. If this occurs, the VSC system automatically controls the engine power and wheel brakes to
reduce the under- or over-steering.
To reduce large over-steering :
If the VSC system determines that the over-steering is large, it activates the brakes for the outer turning wheels depending
on the degree of the over-steering to produce the moment toward the outside of the vehicle and reduce the over-steering.
To reduce large under-steering :
If the VSC system determines that the under-steering is large, it controls the engine power and activates the rear wheel
brakes to reduce the under-steering.
VSC indicator light
If an error occurs in the VSC system, the VSC indicator lights up to warn the driver.
4. Traction Mode and VSC Function
When the center differential of the transfer is locked, the VSC function is turned off. At this time, the VSC OFF indicator light
in the combination meter will come on, and informs the driver that the VSC function is OFF.
5. Mutual System Control
To efficiently operate the VSC system at its optimal level, the VSC system and other control systems are mutually controlled
while the VSC system is being operated.
Engine throttle control
The engine power does not interfere with the VSC brake control by controlling the opening of the throttle and reducing the
engine output.
Engine control and electronically controlled transmission control
The strong braking force does not interfere with the braking force control of the VSC system by turning off the accel. and
reducing changes in the driving torque at shift-down.
VSC system operation indication
The slip indicator light flashes and the buzzer sounds intermittently to warn the driver that the current road is slippery, while
the VSC system is being operated.
6. Fail Safe Function
If an error occurs in the ABS & BA & TRAC & VSC ECU, sensor signals, and/or actuators, the ABS & BA & TRAC & VSC
ECU inhibits the brake actuator control and inputs the error signal to the engine control module. According to the error signal,
the brake actuator turns off the solenoid and the engine control module rejects any electronically controlled throttle open
request from the VSC system. As a result, the vehicle functions without the ABS, BA, TRAC, and VSC systems.
System Outline

Page 2242 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
235
A41 (A), A42 (B), A44 (D) ABS & BA & TRAC & VSC ECU
(D)15-Ground : Always approx. 12 volts
(B) 6-Ground : Approx. 12 volts with ignition SW at ON or ST position
(D)22-

Page 2243 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
236VSC
:Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IA278Engine Room No.2 Wire and Floor No.1 Wir

Page 2244 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
237 SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in

2004 LAND CRUISER (EWD548U)
237 SRS
NOTICE: When inspecting or repairing the SRS, perform the operation in accordance with the following precautionary
instructions and the procedure and precautions in the Repair Manual for the applicable 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 after 90 seconds from when the ignition switch 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 be deployed.)
When the negative (-) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
canceled. So before starting work, make a record of the contents memorized in the audio memory system. When work is
finished, reset the audio systems as they were before and adjust the clock. This vehicle has power tilt and 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 the memory contents. So when the work is finished, it will be necessary
to explain this fact tot the customer, and ask the customer to adjust the features and reset the memory. To avoid erasing
the memory in each memory system, never use a back-up power supply from outside the vehicle.
Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during repairs.
Do not expose the 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 or side airbag sensor
assembly directly to hot air or flames.
Even in cases of a minor collision where the SRS does not deploy, the 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 and side airbag sensor assembly should be inspected.
Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
Never disassemble and repair the 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 or side
airbag sensor assembly in order to reuse it.
If the 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 or side airbag sensor assembly has
been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new
ones.
Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting the system's electrical circuits.
Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
After work on the SRS is completed, perform the SRS warning light check.
If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.

Page 2245 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
238SRS
RSCA OFFSRS
A 10
C 4B19 7. 5A
MET
3Q 7
C12(
A)
, C13(
B)
, C14(
C)SB
B 25
3F 2
3Q 69B 3
3F 8
3Q 11 3E11B 12
3F 1
3E 12B 19
3F 10
3E 14
J157B 7
7B 87B 4
7B 5
713 11
D

Page 2246 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
239
C 10
C 6C 9
C 5
21
P22A 4
A 3A 3(
*1)
A 8(
*2)
21
S17BM2 1BM22 B 14 B13 B16 B17 1243 A28
II4 1 II42II44II43
B 10 B11 B8B7 1234 A27
A 11 A 122 1 S18
C 16 C13 C15 C17
321

Page 2247 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
240SRS
S11
3
A 1
164 2
A 20 18 17 A AC 6 C 52 1 S19
18 4 C
320 C CC19
214C 8C7
12
Y
Y
3D 30
4E 19
143F 5
4C 4
SB G- WB B
IU1 8
IF IF1 34 3
C
2Q 43 C
(
*1) (
*1)
E 9F/ PS
S1

Page 2248 of 3115

TOYOTA LAND CRUISER 1998 Factory Repair Manual 2004 LAND CRUISER (EWD548U)
241
BM2 3
A 11
W- BG
W- BG
W- B GG G
C25(
A)
, C26(
B)
, C27(
C)
10 2G2K 18BU1 3 5BM2
BJ B11
BM BU1 1 4BM23
E 21
E
J22B 5
W- B W- B
W- BG
LBE+A 19(
*1)
(
*2)* 1 : w/ Side

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