Page 801 of 3115

F03003
1 2
6 3 (+)(-)
(+)
(-)
(Oscilloscope) LOCK
F04441
(Reference)
3 ms
2,288 ms
104 ms 5 V
0 V
5 V
0 V
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-549
742 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check steering angle sensor.
PREPARATION:
(a) Remove the steering wheel lower No. 2 and No. 3 covers,
steering wheel pad, steering wheel column upper and
lower covers (See page SR-29).
(b) Disconnect the combination switch connector (for steer-
ing angle sensor).
(c) Connect the oscilloscope to terminals 3 and 6 of the com-
bination switch connector (for steering angle sensor).
(d) Apply battery positive voltage between terminals 1 and 2.
CHECK:
Turn the steering wheel slowly and check the signal waveform.
OK:
HINT:
The above signal waveform does not repeat ON and OFF regu-
larly and this combination changes case by case according to
the data.
NG Replace steering angle sensor.
OK
4 Check that slits of the steering sensor disc are clogged up.
NG Repair or replace steering sensor disc.
OK
Page 802 of 3115
DI-550- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
743 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check for open and short circuit in harness and connector between steering
position sensor and ABS & BA & TRAC & VSC ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 803 of 3115

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-551
744 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC C1232 / 32 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1232 / 32
Detection of either of the conditions 1. or 2.:
1. At a vehicle speed of 6 mph (10 km/h) or more, when
the condition that ECU terminal GL1 signal change
range is less than 20 mV, and ECU terminal GL2 signal
change range swings by 468 mV or more occurs for 30
sec. or more.
2. At a vehicle speed of 6 mph (10 km/h) or more, when
the condition that ECU terminal GL2 signal change
range is less than 20 mV, and ECU terminal GL1 signal
change range swings by 468 mV or more occurs for 30
sec. or more.
Deceleration sensor
Deceleration sensor circuit
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 output value of the yaw rate (deceleration) sensor.
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 DATALIST mode on the hand-held tester.
CHECK:
Check that the deceleration value of the deceleration sensor displayed on the hand-held tester is changing
when tilting the vehicle.
OK:
Deceleration value must be changing.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
DIC9K-02
Page 804 of 3115

F12707
GL1GL2
VYSGYAW
Front
Rearward
Forward
DI-552- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
745 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check yaw rate (deceleration) sensor.
PREPARATION:
(a) Connect 3 dry batteries of 1.5 V in series.
(b) Connect VYS terminal to the batteries' positive (+) termi-
nal, and GYAW terminal to the batteries' negative (-) ter-
minal. Apply about 4.5 V between VYS and GYAW termi-
nals.
NOTICE:
Do not apply voltage of 6 V or more to terminals VYS and
GYAW.
CHECK:
Check the output voltage of GL1 and GL2 terminals when the
sensor is tilted forward and rearward.
OK:
SymbolsConditionStandard Value
GL1HorizontalAbout 2.3 V
GL1Lean rearward1.0 V to about 2.3 V
GL1Lean forwardAbout 2.3 V to 3.5 V
GL2HorizontalAbout 2.3 V
GL2Lean rearwardAbout 2.3 V to 3.5 V
GL2Lean forward1.0 V to about 2.3 V
HINT:
If the sensor is tilted too much, it may show the wrong val-
ue.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be
placed upside down.
NG Replace yaw rate sensor.
OK
3 Check for open or short circuit in harness and connector between yaw rate (de-
celeration) sensor and ABS & BA & TRAC & BA & VSC ECU (See page IN-36).
NG Repair or replace harness and connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 805 of 3115

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-553
746 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC1233 / 33, C1234 / 34Yaw Rate Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1233 / 33
When any of the following 1. through 4. is detected:
1. ECU terminal IG1 voltage is 9.5 V to 17.0 V, and the
condition that yaw rate sensor voltage is out of the range
from 0.25 V to 4.75 V continues for 1 sec. or more.
2. The conditions that yaw rate sensor open detect circuit
signal is ON and the voltage of ECU terminal IG1 is 9.5
V to 17 V continue for 1 sec. or more.
3. The conditions that yaw rate sensor power source volt-
age is out of the range from 4.4 V to 5.6 V and the volt-
age of ECU terminal IG1 is 9.5 V to 17 V continue for 1
sec. or more.
4. When the condition that yaw rate sensor signal is mo-
mentarily open occurs 10 times or more and the voltage
of ECU terminal IG1 is 9.5 V to 17 V.
Yaw rate sensor
Yaw rate sensor circuit
C1234 / 34
Condition 1. or 2. is detected:
1. When the conditions that yaw rate sensor VYS terminal
voltage is 4.75 V to 5.25 V and YD malfunction signal of
yaw rate sensor is ON continue for 5 sec. or more.
2. Shift lever is in P position and output voltage of yaw rate
sensor is out of the range from 2.4 V to 2.6 V or after the
difference from zero point calibration voltage of yaw rate
sensor becomes 0.08 V or more and when the condition
that the vehicle speed exceeds more than 9 mph (15
km/h) while output condition of yaw rate sensor is re-
peated more than 3 times.
DIC9L-01
Page 806 of 3115
F17752
ABS & BA & TRAC
& VSC ECU Y1
Yaw Rate Sensor
ShieldedGL1
GL2
YD
VYS
YAW
GYAW
YSS A43
1827 289 191022
G
Y
L
B
W
R 4
2
6
8
1
5A43
A43
A43
A43
A43
A42 IG4
IG4
IG4
IG4
IG4
IG4
IG416
17
21
19
20
18
22
ShieldedG
Y
L
B
W
R GL1
GL2
YD
VYS
YAW 2
GYAW
DI-554- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
747 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Perform zero point calibration of the yaw rate sensor (See page DI-505).
2 Is DTC still output?
Check the DTC on page DI-505.
NO END.
YES
Page 807 of 3115

F12727
F13720
1
65ON
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-555
748 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check output value of the yaw rate sensor.
In case of using the hand-held tester:
PREPARATION:
(a) Remove the 2 bolts and yaw rate sensor with connectors
still connected.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(d) Select the DATALIST mode on the hand-held tester.
CHECK:
Check that the yaw rate value of the yaw rate sensor displayed
on the hand-held tester changes. Place the yaw rate sensor
vertically to the ground and turn the sensor pivoted on its center.
OK:
Yaw rate value must be changing.
In case of not using the hand-held tester:
PREPARATION:
(a) Remove the yaw rate sensor with the connector still con-
nected to it.
(b) Turn the ignition switch to ON.
CHECK:
Measure voltage between terminals YAW2 (1) - GYAW (5), and
terminals YD (6) - GYAW (5) of the yaw rate sensor.
OK:
Terminals 1 and 5
(YAW2 - GYAW)About 2.42 V to 2.58 V
Terminals 6 and 5
(YD - GYAW)About 4.5 V to 5.3 V
NG Replace yaw rate sensor.
OK
Page 808 of 3115
F02864
ON
GND1
(-)YD
(+)
DI-556- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
749 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check voltage between terminals YD and GND of ABS & BA & TRAC & VSC ECU.
PREPARATION:
Remove the ABS & BA & TRAC & VSC ECU with connectors
still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals YD and GND of the
ABS & BA & TRAC & VSC ECU.
OK:
Voltage: 4.5 to 5.3 V
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
5 Check for open and short circuit in harness and connector between yaw rate
sensor and ABS & BA & TRAC & VSC ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.