TOYOTA LAND CRUISER 1998 Factory Repair Manual

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
A43 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
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-609
802 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1336 / 39 Zero Point Calibration of Deceleration
Sensor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1236 / 39
When either of the following 1. or 2. is detected:
1. In TEST mode, the shift lever is shifted to other than P
position within 2 sec. after ECU terminal IG1 is turned
ON for the first time.
2. When the deceleration sensor zero point recorded in
ECU is deleted.

Deceleration sensor

Deceleration sensor circuit

PNP switch circuit (R position)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check whether zero point calibration of yaw rate (deceleration) sensor has been
done or not.
PREPARATION:
Shift the shift lever in the P position and turn the ignition switch ON. Repeat connecting and releasing Ts
and E
1 terminals of the DLC1 4 times or more for 8 sec. After this, turn the ignition switch OFF and after
connecting terminals Ts and E
1, turn it ON again.
DICA1-01

DI-610- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
803 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Carry out yaw rate (deceleration) sensor zero point calibration and confirm it by
VSC TRAC warning light.
OK:
VSC TRAC warning light blinks
OK No problem.
NG
3 Check DTC for the VSC (See page DI-505).
*1 :Other than DTC C1336 / 39 is output.
*
2 :DTC C1336 / 39 only is output.
*
1Repair ABS control system according to the
code output.
*
2
4 Check for open and short circuit in harness and connector between PNP switch
(P position) and skid control ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
5 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

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-61 1
804 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Check yaw rate (deceleration) sensor (See page DI-505).
NG Replace yaw rate sensor.
OK
Check and replace skid control ECU.

F17776
ABS & BA & TRAC
& VSC ECU
Cowl Side J/B RH
Combination Meter
Cowl Side J/B RH
Cowl Side J/B LHI18
Ignition SW
Engine Room J/B
FL Block BatteryEXI
A433
P-B
3B3 3Q56SB 2
IX1
2 1 W-B
C1210
C1314
SB
W-B
EC
MAIN
F152
B-G1C1 AM2
1B9
W-R 2A 10
2E41
W-R
7AM2IG2
6A
AJ4
J/C
SB
3E4 MET
3Q73Q 28
SB P-B
B-R Center
Diff. LockD4
Detection SW
(Center Diff. Lock) DI-612
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
805 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1340 / 47 Center Differential Lock Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1240 / 47Open or short in center differential lock circuit.
Center differential lock system

Center differential lock circuit
WIRING DIAGRAM
DICA2-01

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-613
806 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check that the center differential is free and center diff. lock switch is OFF.
NG Repair the center differential lock system.
OK
2 Is DTC output?
Check the DTC on page DI-505.
NO END
YES
3 Check that bulb for center diff. lock indicator light is not burnt out.
NG Replace indicator light.
OK
4 Check for open circuit in harness and connector between battery and center diff.
lock indicator light, center diff. lock indicator light and skid control ECU (See
page IN-36).
NG Repair or replace harness or connector.
OK

F17614
EXI
(-)
(+) ON
DI-614- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
807 Author
: Date
:
2004 LAND CRUISER (RM1071U)
5 Check voltage between terminal EXI of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminal EXI of the skid control
ECU and body ground when the transfer is in the L4 posi-
tion.
OK:
Voltage: 10 to 14 V
NG Repair or replace harness or connector.
OK
6 Check transfer indicator switch (See page TR-49).
NG Replace transfer indicator switch.
OK
Check and replace skid control ECU.

F09992
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-655
848 Author
: Date
:
2004 LAND CRUISER (RM1071U)
Check for Fluid Leakage
Check for fluid leakage from the actuator or hydraulic lines.
DICAE-01

DIC94-02
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
-VHigh Speed
Low Speed
CoilNS
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-615
808 Author
: Date
:
2004 LAND CRUISER (RM1071U)
CIRCUIT INSPECTION
DTC
C0200 / 31 - C1239 / 39Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used for control
of the ABS & BA & TRAC & VSC control system. The front and
rear rotors each have 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates AC voltage. Since
the frequency of this AC voltage changes in direct proportion to
the speed of the rotor, the frequency is used by the ECU to de-
tect the speed of each wheel.

DTC No.DTC Detecting ConditionTrouble Area
C0200 / 31
C0205 / 32
C0210 / 33
C0215 / 34
Detection of any of the conditions 1. through 4.:
1. At a vehicle speed of 6 mph (10 km/h) or more, pulses
are not input for 15 sec.
2. Momentary interruption of the speed sensor signal oc-
curs at least 7 times in the time between switching the
ignition switch ON and switching it OFF.
3. Continuous noise occurs into the speed sensor signals
with a vehicle speed at 12 mph (20 km/h) or more.
4. The condition that the speed sensor signal circuit is
open continues for 0.12 sec. or more.

ABS does not function

Brake pedal is not depressed

Parking brake is not set

Rear differential does not lock
Under the above conditions, when the difference in velocity
between the highest rotating and the second highest rotat-
ing wheels is within 1 mph (2 km/h), the slowest wheel ro-
tates at 0 mph (0 km/h), and the second slowest wheel
rotates at 7 mph (12 km/h) for 1 second or more.

Right front, left front, right rear and left rear speed sensor

Each speed sensor circuit

Sensor rotor
C1235 / 35
C1236 / 36
C1238 / 38
C1239 / 39Continuous noise occurs into the speed sensor
signals with a vehicle speed at 12 mph (20 km/h)
or more continues for 5 sec or more.
Right front, left front, right rear, left rear speed sensor

Speed sensor rotor
HINT:

DTC No. C0200 / 31 and C1235 / 35 are for the right front speed sensor.

DTC No. C0205 / 32 and C1236 / 36 are for the left front speed sensor.

DTC No. C0210 / 33 and C1238 / 38 are for the right rear speed sensor.

DTC No. C0215 / 34 and C1239 / 39 are for the left rear speed sensor.

F17757
FSS
FL+
FL-
FR+
FR-
RL+
RL-
RR+
RR-
RSS A41
A41
A41
A41
A41
A42
A42
A42
A42
A42 B
BB
R
G
L
P A12
ABS Speed
Sensor Front LH
IA2
BD3 BF2A13
ABS Speed
Sensor Front RH(Shielded)
A35
ABS Speed
Sensor
Rear LHJ2
J/C
W-R
42
21
R56
15
14 7
6
1
96
5
10
2
11
7
816A
A
A
W-L9 J2
J/C2120 191813 1415 16 25
R
G
B
WB
WB
W R
G R
G
A36
ABS Speed
Sensor
Rear RH 1
21
2ABS & BA & TRAC
& VSC ECU
(Shielded)
(Shielded)
(Shielded)(Shielded)
(Shielded)
(Shielded)(Shielded) G
B
WIA2
IA2
IA2
IA2
IA2 BF2
BF2
BF2BD3
BD3
BD3
BD3
BD3 DI-616
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
809 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

F04508
LOCK
12
12RH Side LH Side
2
4
4 2
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-617
810 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 speed 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 there is no difference between the speed value output from the speed sensor displayed on the
hand-held tester and the speed value displayed on the speedometer when driving the vehicle.
OK:
There is almost no difference from the displayed speed value.
HINT:
There is tolerance of ± 10 % in the speedometer indication.
OK Go to step 4.
NG
2 Check speed sensor.
Front:
PREPARATION:
(a) Make sure that there is no looseness at the connector's
locking part and connecting part of the connector.
(b) Disconnect the speed sensor connector.
CHECK:

LH side:
Measure resistance between terminals 2 and 4 of the
speed sensor connector.

RH side:
Measure resistance between terminals 1 and 2 of the
speed sensor connector.
OK:
Resistance: 0.92 to 1.22 kW
CHECK:

LH side:
Measure resistance between terminals 2 and 4 of the
speed sensor connector and body ground.

RH side:
Measure resistance between terminals 1 and 2 of the
speed sensor connector and body ground.