TOYOTA LAND CRUISER 1998 Factory Repair Manual

F17705
SFLH
SFLR
SFRH
SFRR
SRLH
SRLR
SRRH
SRRR
AST
BS
BatterFL Block
MAINABS No.1 ABS
SOL Relay Engine Room R/B ABS & BA & TRAC
& VSC ActuatorABS & BA & TRAC
& VSC ECU
SFLH
SFLR
SFRH
SFRR
SRLH
SRLR
SRRH
SRRR
AST A398
A4121
A44 16 A39
A39
A39
A39
A39
A39
A39
A38
A37A41
A41
A41
A41
A41 7
10
9
4
3
2
1
1
47
8
7
1
9 8
6
19
1 A44
A44
A44
A44 Y
B-Y
LG
B-W
R-W
R-Y
G-Y
P
B-R L-BB-O R-G
W
1
11
1 1
1
1 1 3
6
4
2 Engine Room J/B and
Engine Room R/B
1C B-R
F152SR
R1+
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-529
722 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

F02855
LOCK
A43A45
4
1 2
3
4
10
9
87
DI-530- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
723 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check hydraulic brake booster solenoid.
PREPARATION:
Disconnect the 2 connectors from the hydraulic brake booster.
CHECK:
Check continuity between terminals A43 - 4 and A45 - 1, 2, 3,
4, 7, 8, 9 and 10 of the hydraulic brake booster connector.
OK:
Continuity
HINT:
Resistance of each solenoid at 20 °C (68 °F):
SFRH, SFLH, SRRH, SRLH: 6.95 to 7.45 W
SFRR, SFLR, SRRR, SRLR: 2.00 to 2.40 W
NG Replace hydraulic brake booster.
OK
2 Check for open and short circuit in harness and connector between skid control
ECU and actuator (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.

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-531
724 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTCC0278 / 11, C0279 / 12ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11
Conditions 1. and 2. continue for 0.2 sec. or more:
1. ECU terminal IG1 voltage is 9.5 V to 17.0 V and the
solenoid relay is ON, however, the contact point of the
solenoid relay is OFF.
2. With solenoid relay ON, ECU terminal IG1 voltage be-
comes 9.5 V or less and the contact point of the sole-
noid relay does not become ON.

ABS solenoid relay

ABS solenoid relay circuit
C0279 / 12
Immediately after ECU terminal IG1 becomes ON, and
solenoid relay is OFF, however, when the condition that
the solenoid relay due to the contact point is ON continues
for 0.2 sec. or more.
WIRING DIAGRAM
Refer to DTC C0226/21 on page DI-528.
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 ABS solenoid relay operation.
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 ACTIVE TEST mode on the hand-held tester.
CHECK:
Check the operation sound of the ABS solenoid relay when operating it with the hand-held tester.
OK:
The operation sound of the ABS solenoid relay should be heard.
OK Go to step 6.
NG
DIC98-02

F04447
(-) (+) 1
2
Engine Room J/B
F00042
1 34
6 Open
(+)(-)1 2 3
4
4 5 6
1 2
3
2 5 6
5 Continuity
ContinuityContinuity
Open
DI-532- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
725 Author
: Date
:
2004 LAND CRUISER (RM1071U)
2 Check voltage between terminals 1 and 2 of engine room J/B (for ABS solenoid
relay).
PREPARATION:
Remove the ABS solenoid relay from the engine room J/B.
CHECK:
Measure the voltage between terminals 1 and 2 of the engine
room J/B (for ABS solenoid relay).
OK:
Voltage: 10 to 14 V
NG Check and repair harness or connector.
OK
3 Check ABS solenoid relay.
CHECK:
Check continuity between each terminal of the ABS solenoid
relay.
OK:
Terminals 4 and 6Continuity
(Reference value 80 W)
Terminals 2 and 3Continuity
Terminals 1 and 3Open
CHECK:
(a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between each terminal of the ABS sole-
noid relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
NG Replace ABS solenoid relay.
OK

F02839
ECU ABS Solenoid
Relay
Brake
Booster
3
4
AST
A43
A44
1
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-533
726 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check continuity between terminals 3 of ABS solenoid relay and terminal AST of
skid control ECU.
CHECK:
Check continuity between terminal 3 of the ABS solenoid relay
and terminal AST of the skid control ECU.
OK:
Continuity
HINT:
There is resistance of 33 ± 3 W between terminals 4 of connec-
tor A43 and terminal 1 of connector A44.
NG Repair or replace harness, connector or hy-
draulic brake booster.
OK
5 Check for open and short circuit in harness and connector between ABS sole-
noid relay and skid control ECU (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-534- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
727 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Check for open circuit in harness and connector between AST of hydraulic brake
booster and AST of skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace hydraulic brake booster or skid con-
trol ECU.

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-535
728 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1201 / 51 Engine Control System Malfunction
CIRCUIT DESCRIPTION
If trouble occurs in the engine control system, the ECU prohibits TRAC and VSC control.
DTC No.DTC Detecting ConditionTrouble Area
C1201 / 51
Conditions 1. and 2. continue for 5 sec.:
1. Engine speed: 500 rpm or more.
2. A trouble signal in the engine control system is input.
Engine control system
INSPECTION PROCEDURE
1 Check the DTC for the engine (See page DI-3).
*1Repair engine control system according to the
output code.
*
2
Check for ECM connected to malfunction in-
dicator light.
*
1: Output NG code
*
2: Malfunction indicator light remains ON
DIC99-01

F13732
ENG- ENG+
TRC+
TRC-24
22 14
16 A42 ECM
ENG+
ENG-
TRC+
TRC- ABS & BA & TRAC
& VSC ECU
E9
A42
A4224
A42 R
G
Y
L IG4
IG4
IG4
IG412
13
1
2 R
G
Y
L 30
25
31E9
E9
E9 DI-536
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
729 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1203 / 53 ECM Communication Circuit Malfunc-
tion
CIRCUIT DESCRIPTION
The circuit is used to send TRAC & VSC control information from the skid control ECU to the ECM (TRC+,
TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).
DTC No.DTC Detecting ConditionTrouble Area
C1203 / 53
Either of the following 1. or 2. continues for 5 sec.:
1. ECU IG1 terminal voltage is 9.5 V to 17.0 V and data
transmission to the ECM is impossible.
2. ECU IG1 terminal voltage is 9.5 V to 17.0 V, engine
speed is 500 rpm or more or vehicle speed is 60 km/h
(36 mph) or more and data receiving from the ECM is
impossible.

TRC+ or TRC- circuit

ENG+ or ENG- circuit

ECM
WIRING DIAGRAM
DIC9A-01

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