Page 885 of 3115
DI-646- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
839 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
1 Check operation of the VSC OFF indicator light.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC OFF indicator light can be shown on the combination meter with the
hand-held tester.
NG Go to step 3.
OK
2 Is DTC output for VSC?
YES Repair circuit indicated by the output code.
NO
3 Does the warning lights other than VSC OFF indicator light come on?
YES Go to step 5.
NO
Page 889 of 3115
DI-632- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
825 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the table below for each trouble symptom.
VSC TRAC warning light does not light up*1
VSC TRAC warning light remains on*2
*1: Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
*
2: After inspection with step 4, start the inspection from step 5 in case of using the hand-held tester and
start from step 6 in case of not using hand-held tester.
1 Check operation of the VSC TRAC warning light.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC TRAC warning light can be shown on the combination meter on the
hand-held tester.
OK Check and replace skid control ECU.
NG
2 Does the warning lights other than VSC TRAC warning light come on?
YES Repair VSC TRAC warning light bulb or com-
bination meter assembly.
NO
Page 893 of 3115
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration DateRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
TRAC does not operate. (Wheels spin when starting rapidly.)
DisplaysDoes not display
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
Light Abnormal TRAC OFF Indicator
Light Abnormal SLIP Indicator
Remains ONDoes not light up
Check Item
NormalMalfunction Code (Code )
NormalMalfunction Code (Code )
ABS Warning Light
Malfunction
Indicator Light TRAC & VSC Check Sheet
Remains ONDoes not light up
VSC does not operate. (Wheels sideslip at the time of sharp turning.)
VSC TRC Warning
Indicator Abnormal
Skid Control
Buzzer AbnormalDoes not soundSounds
VSC/TRC OFF SW
SYSTEMFreeze Frame Data
SHIFT POSITION
YAW RATON
OFF
VSC/TRC
P, NR
D
deg/s
VFAIL
23
4L
MAS CYL PRESS
THROTTLE
MAS PRESS GRADE
G (RIGHT&LEFT)
G (BACK&FORTH)
STEERING ANG
deg
deg
MPa/s
G
G DI-504
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
697 Author: Date:
2004 LAND CRUISER (RM1071U)
Page 899 of 3115
DIC8X-01
F17606
ABS Motor 1
Relay
ABS Motor 2
RelayABS Solenoid
Relay
Master Cylinder Pressure Sensor
Hydraulic Brake Booster
Check
Connector
Front Speed
Sensor Rotor
Front Speed Sensor
Engine Room J/BNeutral Start SwitchRear Speed Sensor
RotorRear Speed
Sensor
Steering Angle Sensor
Engine and ECT
ECU
Yaw Rate Sensor and
Deceleration Sensor DLC3
Stop Light Switch Skid Control ECU with
Warning Buzzer Combination Meter
ABS Warning Light
VSC TRC Warning Light
BRAKE Warning Light
VSC OFF Indicator Light
SLIP Indicator Light
ACTIVE TRC
Indicator Light
DI-522- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
715 Author: Date:
2004 LAND CRUISER (RM1071U)
PARTS LOCATION
Page 906 of 3115
F02201
DLC1 E1
TcTs
BR3904
0.13 sec. 0.13 sec.
ON
OFF
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-51 1
704 Author: Date:
2004 LAND CRUISER (RM1071U)Hand-held tester displayReference Value* Measurement Item
SHIFT POSITIONShift lever position
FAIL
P, N
R
D
4
3
2
L
THROTTLEThrottle sensor reading0 to 125 deg.
*: If no conditions are specifically stated for ºIdlingº, it means the shift lever is in the N or P position, the A/C
switch is OFF and all accessory switches are OFF.
5. SPEED SENSOR SIGNAL CHECK (TEST MODE)
HINT:
When replacing the yaw rate sensor or ECU, make sure
to perform a yaw rate sensor zero point calibration.
If the ignition switch is turned from the ON to the ACC or
LOCK position during test mode, DTC will be erased.
(a) In case of not using hand-held tester:
Check the speed sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit and Ts circuit (See page DI-627 and DI-653).
(5) Keep the vehicle in the stationary condition on the
flat place for 6 sec. or more.
(6) Shift the transfer lever in the L4 position and turn the
center diff. lock switch ON.
(7) Shift the transfer lever back.
Page 909 of 3115
F02201
DLC1 E1
TcTs
BR3904
0.13 sec. 0.13 sec.
ON
OFF
F02135
Start Position
End PositionWithin ± 5° DI-514
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
707 Author: Date:
2004 LAND CRUISER (RM1071U)
(a) Procedures for test mode:
(1) Turn the ignition switch OFF.
(2) Check that the shift lever is in the P position, and
turn the steering wheel to the neutral position.
(3) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843-18020
(4) Start the engine.
(5) Check that the VSC TRAC warning light blinks.
HINT:
If the VSC TRAC warning light does not blink, inspect the VSC
TRAC warning light circuit and Ts terminal circuit (See page
DI-631 and DI-653).
Turn the steering wheel either to the left or right 450° or
more from the vehicle stationary condition, and turn back
the steering wheel to the straight ahead position.
(b) Keep the vehicle stationary on a level place for 1 sec. or
more.
(c) Check the yaw rate sensor.
Shift the shift lever to the D position and drive the vehicle
at a vehicle speed of approx. 5 km/h (3 mph), turn the
steering wheel either to the left or right 90° or more, and
maintain this angle until the vehicle has turned 180°.
Stop the vehicle and shift the shift lever to the P
position. Check that the VSC buzzer sounds for 3
sec.
If the VSC buzzer sounds, the sensor check is in normal
completion.
If the VSC buzzer does not sound, do the sensor check again.
If the VSC buzzer still does not sound, check the VSC buzzer
circuit, then do the sensor check again.
Trouble AreaSee page
VSC buzzer circuitDI-649
HINT:
Make a 180° turn. At the end of the turn, the direction of
the vehicle should be within 180°± 5° of its start position.
Do not spin the wheels.
(d) Read the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1 or Tc and CG of the DLC3.
SST 09843-18020 or 09843-18040
(2) Read the number of times the VSC TRAC warning
light blinks.
HINT:
See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output. (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated.)
Page 910 of 3115
Malfunction Code (Example Code 71, 72)
ON
OFF
0.5 sec.0.5 sec.
1.5 sec.2.5 sec.
4 sec.
Repeat
71
72
F06425
Hand-held
Tester
DLC3
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-515
708 Author: Date:
2004 LAND CRUISER (RM1071U)
If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(3) After doing the check, disconnect the SST from ter-
minals of the DLC1 or terminals of the DLC1 and
DLC3 and turn the ignition switch OFF.
SST 09843-18020 or 09843-18040
7. In case of using hand-held tester:
CHECK VSC SENSOR SIGNAL
NOTICE:
When having replaced the yaw rate sensor, deceleration
sensor and/or ECU, perform a zero point calibration of the
yaw rate and deceleration sensors (See step 7.). Make sure
that this operation should be done before starting the fol-
lowing.
(a) Hook up the hand-held tester to the DLC3.
(b) Do steps (a)-(2) and from (a)-(4) to (c) on the previous
page.
(c) Read the DTC by following the prompts on the tester
screen.
HINT:
Please refer to the hand-held tester operator's manual for fur-
ther details.
DTC of the VSC sensor check function:
Code No.DiagnosisTrouble Area
C0371 / 71Yaw rate sensor output signal malfunctionYaw rate sensor
Yaw rate sensor circuit
Page 911 of 3115
F02201
DLC1
E
1
Ts DI-516
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
709 Author: Date:
2004 LAND CRUISER (RM1071U)
8. IF NECESSARY, PERFORM ZERO POINT CALIBRA-
TION OF YAW RATE AND DECELERATION SENSORS
HINT:
When having replaced the yaw rate sensor, deceleration
sensor or/and the ECU, make sure to perform a yaw rate
and deceleration sensors zero point calibration.
This operation is also required when the deceleration
sensor or yaw rate sensor has been replaced since the
calibrated zero point of both sensors will be erased.
NOTICE:
While obtaining the zero point, do not vibrate the ve-
hicle by tilting, moving or shaking it and keep it in a
stationary condition. (Do not start the engine.)
Be sure to do this on a level surface (within an inclina-
tion of 1 %).
(a) Clear the zero point of the yaw rate and deceleration sen-
sors.
(1) Shift the shift lever to P range.
(2) Turn the ignition switch ON in a stationary condition.
(3) With the ignition switch ON, using SST, repeat a
cycle of short and open between terminals Ts and
E
1 of the DLC1 4 times or more within 8 sec. Check
that the VSC warning light is lit indicating the re-
corded zero point is erased.
SST 09843-18020
(4) Turn the ignition switch OFF.
(b) Obtain the zero point of the yaw rate sensor.
(1) Disconnect terminals Ts and E
1 of the DLC1.
(2) Turn the ignition switch ON.
HINT:
The vehicle should be in a stationary condition with the shift le-
ver in the P position.
(3) Check that the lighted VSC warning light goes off
about 15 sec. after the ignition switch is turned ON.
HINT:
Even if the ignition is not turned OFF in step (a)-(4) and remains
ON, a yaw rate sensor zero point calibration can be completed.
In this case, the VSC warning light is lit about 15 sec. and starts
blinking. (Normal code)
(4) After ensuring that the VSC warning light remains
OFF for 2 sec., turn the ignition switch OFF.
HINT:
If the ignition switch is not turned OFF in step (a)-(4), ensure
the blinking of the VSC warning light for 2 sec. and turn the igni-
tion switch OFF.
