Page 798 of 3115
DI-546- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
739 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC1231 / 31, C1335 / 35Steering Angle Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1231 / 31
Detection of any of the conditions 1. through 3.:
1. When the condition that ECU terminal IG1 voltage is 9.5
V or more, and does not receive data from steering
angle sensor continues for 1 sec. or more.
2. When the steering angle sensor value changes by 360°
or more with SSC signal from steering angle sensor
remaining ON or OFF.
3. When the condition that difference between the steering
angle value at edge occurring in SSC signal and the
value at edge occurring in SSC signal after turning the
steering wheel one-turn is out of the range from 355.5°
- 364.5° occurs 10 times or more.
Steering angle sensor
Steering angle sensor circuit
C1335 / 35
When the ECU IG1 terminal voltage is 9.5 V or more, data
transmission from the steering angle sensor is impossible
for 1 sec. or more.Steering angle sensor
Steering angle sensor circuit
DIC9J-02
Page 800 of 3115
F17609
ESS (-)
IG (+)
BAT (+)
DI-548- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
741 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 output value of the steering angle 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 steering wheel turning angle value of the steering angle position sensor displayed on the
hand-held tester is changing when turning the steering wheel.
HINT:
After certifying ºZeroº point calibration of the steering angle sensor (Speed: 21 mph (35 km/h), driving straight
ahead for 10 sec. or more), the value will change.
OK:
Steering wheel turning angle value must be changing.
OK Go to step 5.
NG
2 Check input voltage of the steering angle sensor.
PREPARATION:
Remove the column lower cover.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals 1 and 2, 2 and 9 of
the combination switch wire harness side connector.
OK:
Voltage: 10 to 14 V
NG Check and replace harness and connector.
OK
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
