TOYOTA LAND CRUISER 1998 Factory Repair Manual
Page 771 of 3115
F17750F18532
ABS & BA & TRAC
& VSC ECU Cowl Side J/B RH Combination Meter
Cowl Side J/B RH
Engine Room J/B
Cowl Side J/B LH
Cowl Side J/B LH
I18
Ignition SW
FL Block
Cowl Side J/B LHWA
IG2 A42
A44 R-L
3A4
3Q5
SB
C1212
ABS
10
C12
C15 1
SB
IX1 8
BR
EC
IFIF EEW-B
3
2A
2B 13
A416 A4131 A428 A4217 A426
GND4
GND3
GND1
GND2 3Q7
3B 22MET
IGN
3E4
B-R
A
A J4
J/C
B-R
6
4 7
2AM2 IG2
AM1IG1
B-W B-RL-B
2E37
2B 18
2E39 ECU-IG1 2
3
5 1IG1 No.2 Relay
2C1
B-G
F161
B-G
F152J/B No.2ALT
MAIN
BatteryW-R
2A10
2E 41 1C1AM2
1B9B-R
SB
AM11
22
IG1
W-B
W-B
W-B
W-B
W-B
W-R
W-B
W-B
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-621
814 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC Always ON Malfunction in ECU
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Always ON
Either of the following 1. or 2. is detected:
1. The ECU connectors are disconnected from the ECU.
2. There is a malfunction in the ECU internal circuit.Battery
IC regulator
Power source circuit
Skid control ECU
HINT:
The hand-held tester may not be used when the ECU is abnormal.
WIRING DIAGRAM
DICA3-01
Page 772 of 3115
DI-622- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
815 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
2 Is DTC output?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code .
NO
3 Does ABS warning light go off?
YES Check for open or short circuit in harness and
connector between ECU-IG fuse and ECU (See
page IN-36).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
Page 773 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-623
816 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check operation of the ABS warning light.
In case of using the hand-held tester:
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 that ºONº and ºOFFº of the ABS warning light can be shown on the combination meter by the hand-
held tester.
In case of not using the hand-held tester:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Using a service wire, connect terminal WA of the skid control ECU harness side connector and body
ground.
(d) Turn the ignition switch ON.
CHECK:
Check that the ABS warning goes off.
OK Check and replace combination meter (See
page BE-2).
NG
6 Check for short circuit in harness and connector between combination meter
and skid control ECU, combination meter and DLC1 (See page
IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 774 of 3115
F09989
ABS & BA & TRAC
& VSC ECU
V8
VSC Warmning Buzzer Cowl Side J/B LH
ECU-IG1
BZ A422
L B-W
21 2B 18
Buzzer
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-649
842 Author: Date:
2004 LAND CRUISER (RM1071U)
Brake Warning and VSC Buzzer Circuit
CIRCUIT DESCRIPTION
The brake warning and VSC buzzer sounds while the accumulator pressure is abnormally low or an ab-
normality casing low fluid pressure occurs VSC is activated.
WIRING DIAGRAM
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 operation of the brake warning and VSC buzzer.
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 that brake warning and VSC buzzer sounds ºONº and ºOFFº with the hand-held tester.
OK Check and replace skid control ECU.
NG
DICAB-01
Page 775 of 3115
F02192
1
2 (+) (-)
DI-650- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
843 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check brake warning and VSC buzzer.
PREPARATION:
Disconnect the brake warning and VSC buzzer connector.
CHECK:
Apply battery positive voltage to terminals 1 and 2 of the brake
warning and VSC buzzer connector. Check that the brake warn-
ing light comes on and the VSC buzzer sounds.
NG Replace brake warning and VSC buzzer.
OK
3 Check for open and short circuit in harness and connector between skid control
ECU and brake warning and VSC buzzer (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
Page 776 of 3115
F16083
Cowl Side J/B RH
I18
Ignition SW ABS & BA
& TRAC
& VSC Actuator
Cowl Side J/B LH
Engine Room J/B
F15
FL Block
AM2
P8
Parking
Brake
SW Battery BrakeBRL A435
Y-G
3A 11
3Q6
SB
3E4 MET
3Q7
SB C1419
C1210
C151
C1420
2B20IX1
A A
A4213 2Q36
A40
LBL2
Y-G
2KR-W 27AM2 2A10
1B9
EC 2
MAIN6
IG2J4
J/CB-R Combination Meter
1 W-R
B-G
BR 8
SBSB
2E
2B41
4SB
7
PKB
R-W
1C1W-R
B-RABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-635
828 Author: Date:
2004 LAND CRUISER (RM1071U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
The BRAKE warning light lights up while the brake fluid is insufficient and EBD is abnormal.
WIRING DIAGRAM
DICA7-02
Page 777 of 3115
DI-636- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
829 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-63).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-63).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS?
YES Repair circuit indicated by the output code.
NO
4 Do the warning lights other than BRAKE warning light come on?
YES Go to step 6.
NO
Page 778 of 3115
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-637
830 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check IG1 No. 1 relay.
PREPARATION:
Remove the IG1 No. 1 relay from the engine room J/B.
CHECK:
Check continuity between the IG1 No. 1 relay terminals listed
in the table below.
OK:
Terminals 3 and 4Continuity
Terminals 1 and 2Open
CHECK:
(a) Apply battery positive voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2Continuity
NG Replace IG1 No. 1 relay.
OK
Check for open circuit in harness and connector between IG1 No. 1 relay and combination meter
(See page IN-36).
6 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
Page 779 of 3115
DI-638- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
831 Author: Date:
2004 LAND CRUISER (RM1071U)
7 Check BRAKE warning light.
Check if that the open circuit in the combination meter circuit (See page BE-58).
NG Repair brake warning light bulb or combination
meter assembly.
OK
8Check for short circuit in harness and connector between brake warning light and skid
control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and repair skid control ECU.
Page 780 of 3115
DI-528- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
721 Author: Date:
2004 LAND CRUISER (RM1071U)
DTCC0226 / 21 - C0256 / 24ABS Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
C0226 / 21Open or short in SFRH or SFRR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SFRH or SFRR circuit
C0236 / 22Open or short in SFLH or SFLR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SFLH or SFLR circuit
C0246 / 23Open or short in SRRH or SRRR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SRRH or SRRR circuit
C0256 / 24Open or short in SRLH or SRLR circuit continues for 0.015
sec. or more.Hydraulic brake booster
SRLH or SRLR circuit
DIC95-01