ABS TOYOTA LAND CRUISER 1998 Factory Manual PDF

F17613
Normal Signal Waveform
1 V /
Division
2 m/s / DivisionGND
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-537
730 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check skid control ECU communication.
(REFERENCE) INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the skid control ECU.
(b) Connect the oscilloscope to each of terminal ENG+ or
TRC+ and GND of the skid control ECU.
CHECK:
Start the engine, and check the signal waveform.
NG Check and replace skid control ECU.
OK
2 Check for open and short circuit in harness and connector between each of ter-
minals ENG+, ENG-, TRC+, TRC- of skid control ECU and ECM (See page
IN-36).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

F17752
ABS & BA & TRAC
& VSC ECU
Yaw Rate Sensor
ShieldedGL1
GL2
YD
VYS
YAW
GYAW
YSS A43
1827 289 191022
G
Y
L
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
GYAWB DI-538
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
731 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1210 / 36 Zero Point Calibration of Yaw Rate
Sensor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1210 / 36
When either of the following 1. or 2. is detected:
1. After battery terminal was connected, when the shift
lever was moved to other than P position within 15 sec.
soon after ECU terminal IG1 becomes ON for the first
time.
2. When the yaw rate sensor zero point recorded in ECU is
deleted.

Yaw rate sensor

Yaw rate sensor circuit

PNP switch circuit (P position)
WIRING DIAGRAM
DIC9C-01

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-539
732 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check whether zero point calibration of yaw rate 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 that do not move the vehicle for 15 sec. or more.
CHECK:
Check that theºVSC TRACº warning light and ºVSC OFFº indicator light light up for 15 sec.
OK No problem.
NG
2 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
3 Check for open and short circuit in harness and connector between yaw rate
sensor and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
4 Check yaw rate sensor (See page DI-553).
NG Replace yaw rate sensor.
OK
Check and replace skid control ECU.

DI-540- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
733 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1223 / 43 ABS Control System Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1223 / 43ABS control system is abnormal.ABS control system
INSPECTION PROCEDURE
1 Check the DTC for the ABS (See page DI-505).
*1Repair ABS control system according to the
code output.
*
2
Check for ECU connected to malfunction in-
dicator light.
*
1: Output NG code
*
2: Malfunction indicator light remains ON
DIC9E-01

F17754
ABS & BA & TRAC
& VSC ECU
ECM
J/B No.5
NEO A427
W
5D 12
5
5C E9W
NEO17
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-541
734 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1224 / 44 NE Signal Circuit
CIRCUIT DESCRIPTION
The skid control ECU receives engine revolution speed signals (NE signals) from the ECM.
DTC No.DTC Detecting ConditionTrouble Area
C1224 / 44
When either of the following 1. or 2. is detected:
1. At vehicle speed of 19 mph (30 km/h) or more, and
when data received from the ECM is in normal condition,
and open or short circuit for engine revolution signal
circuit continues for 10 sec. or more.
2. While TRAC is operating, the conditions that open or
short circuit in engine revolution signal circuit is de-
tected, main throttle opening degree is 0 and IDL switch
is OFF continue for 0.24 sec. or more.

NEO circuit

ECM

Skid control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between terminal
NEO of skid control ECU and terminal NEO of ECM (See page
IN-36).
NG Repair or replace harness and connector.
OK
DIC9G-01

F02807
ON
NEO
(+)
(-)
F03007
(Reference)
10 to 14 V
Below 1 V
DI-542- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
735 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminal NEO 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 NEO of the skid con-
trol ECU and body ground for the engine conditions be-
low.
OK:
Engine conditionVoltage
OFF (IG ON)10 to 14 V or below 1 V
ON (Idling)10 to 14 V e below 1 V (Pulse)
NG Check and replace skid control ECU or ECM.
OK
If the same codes are still output after the DTC is deleted, check the contact condition of each
connection.

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-543
736 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTCC1225 / 25 to C1228 / 28TRAC & VSC Solenoid Circuit
CIRCUIT DESCRIPTION
The TRAC & VSC solenoid operates in accordance with signals from the ECU and raises the fluid pressure
in and releases it from the brake cylinders.
DTC No.DTC Detecting ConditionTrouble Area
C1225 / 25Open or short in SA1 circuit continues for 0.015 sec. or
more.
Hydraulic brake booster

SA1 circuit
C1226 / 26Open or short in SA2 circuit continues for 0.015 sec. or
more.
Hydraulic brake booster

SA2 circuit
C1227 / 27Open or short in SA3 circuit continues for 0.015 sec. or
more.
Hydraulic brake booster

SA3 circuit
C1228 / 28Open or short in STR circuit continues for 0.015 sec. or
more.
Hydraulic brake booster

STR circuit
DIC9H-02

F17708
ABS & BA & TRAC
& VSC ECU ABS & BA & TRAC
& VSC Actuator
Engine Room R/B
Engine Room J/B and
Engine Room R/B
FL Block
BatterySTR
SA3
SA2
SA1
SR A41
A41
A41
A41
A41
R1+
A411192 3 4 5
G-Y
G-W
B
G A396
5
A39
11
A39
12
A39
A374 STR
SA3
SA2
SA1
BSL-B
1 ABS SOL Relay
1
1131
4 6
1
1 1C1 ABS No.1
F15 MAINB-GB-RP G-Y
2
2 B-G DI-544
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
737 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

F02857
LOCK
45
6
11 12
A43
A45
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-545
738 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check TRAC & VSC solenoid.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
Check continuity between terminals A43 - 4 and A45 - 5, 6, 11
and 12 of the hydraulic brake booster.
OK:
Continuity
HINT:
Resistance of each solenoid at 20 °C (68 °F):
SA1, SA2, STR: 4.05 to 4.55 W
SA3: 6.95 to 7.45 W
NG Replace hydraulic brake booster.
OK
2 Check for open and short circuit in harness and connector between skid control
ECU and hydraulic brake booster (See page IN-36).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connections are normal, the ECU may be defective.

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