1998 TOYOTA LAND CRUISER sensor

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

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.

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-564
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
757 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTCC1243 / 43, C1245 / 45Malfunction in Deceleration Sensor
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1243 / 43
While vehicle speed becomes 0 mph (0 km/h) from 30 km/h
(18 mph), and the condition that GL1 and GL2 signals of ECU
terminals did not change 40 mV or less continued in a
sequence 16 times.
Deceleration sensor
C1245 / 45
At the vehicle speed of 18 mph (30 km/h) or more, and the
condition that the difference between acceleration and decel-
eration values of computation from deceleration sensor and
vehicle speed becomes more than 0.35 G continues for 60
sec. or more.
Deceleration sensor

Wire harness for deceleration sensor system
WIRING DIAGRAM
DIC9P-01

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-565
758 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step1 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 skid control ECU.
NG

F12707
GL1GL2
VYSGYAW
Front
Rearward
Forward
DI-566- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
759 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 skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

F17752
ABS & BA & TRAC
& VSC 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
GYAWABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-567
760 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1244 / 44 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects vehicle deceleration. The sensor signal is used in ABS & BA & TRAC & VSC control.
If the sensor functions abnormally, the ABS warning light comes on.
DTC No.DTC Detecting ConditionTrouble Area
C1244 / 44
Either of the following 1., 2., 3. or 4. is detected:
1. The condition that ECU terminals GL1 and GL2 values are
-1.5 G or less or 1.5 G or more continues for 1.2 sec. or
more.
2. The condition that the deceleration sensor terminal VGS
voltage is 4.4 V or less or 5.6 V or more continues for 1.2
sec. or more.
3. At a vehicle speed of 0 mph (0 km/h), after the difference of
output value between deceleration sensor terminals GL1
and GL2 becomes 0.6 G or more, and the condition that
does not become 0.4 G or less continues for 60 sec. or
more.
4. Deceleration sensor signal momentary open occurs for 7
times or more.

Deceleration sensor

Deceleration sensor circuit
WIRING DIAGRAM
DIC9Q-01

DI-568- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
761 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between yaw rate
(deceleration) sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK

F12707
GL1GL2
VYSGYAW
Front
Rearward
Forward
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-569
762 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
Check and replace skid control ECU.