Page 553 of 3115
I24672
TOYOTA Hand-held Tester
BR-44
- BRAKEHYDRAULIC BRAKE BOOSTER
2180 Author: Date:
2004 LAND CRUISER (RM1071U)
When rotating the wheel fast, the fail-safe function is acti-
vated and judgement cannot be made properly. So rotate
the wheel as slowly as possible.
(j) Lower the vehicle.
(k) Disconnect the TOYOTA hand-held tester.
3. w/ ABS & TRAC & VSC only,
In case of using TOYOTA hand-held tester:
INSPECT HYDRAULIC BRAKE BOOSTER OPERA-
TION
(a) Inspect the battery positive voltage.
Battery positive voltage: 10 - 14 V
(b) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes light and stroke becomes longer.
(c) Check that the brake pedal becomes light to depress.
If the pedal does not become to be light to depress, check and
replace the brake line and hydraulic brake booster.
(d) Turn the ignition switch ON, check the pump motor opera-
tion noise.
If the pump motor does not operate, check and replace the wire
harness and pump motor (See page BR-64).
(e) Connect the TOYOTA hand-held tester.
(1) Connect the TOYOTA hand- held tester to the
DLC3.
(2) Turn the ignition switch ON.
(3) Select the ºACTIVE TESTº mode on the TOYOTA
hand-held tester.
HINT:
Please refer to the TOYOTA hand-held tester operator's
manual for further details.
To protect the solenoids, TOYOTA hand-held tester turns
OFF automatically 2 sec. after every solenoid has been
turned ON.
(f) Inspect the front TRAC & VSC solenoid operation.
(1) Select ºSA1º and ºSA2º on the TOYOTA hand-held
tester.
(2) With ºSA1º and ºSA2º turned ON simultaneously
with the TOYOTA hand-held tester, depress the
brake pedal with stable force and check that the
pedal cannot be depressed.
Page 558 of 3115
F04706
F02828
- BRAKEHYDRAULIC BRAKE BOOSTER
BR-49
2185 Author: Date:
2004 LAND CRUISER (RM1071U)
(e) Place ºSHEET Gº (SST) of ºFRONTº on actuator checker.
SST 09990-00240
(f) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes light and stroke becomes longer.
(g) Turn the ignition switch ON, check the pump motor opera-
tion noise.
If the pump motor does not operate, check and replace the wire
harness and pump motor (See page BR-64).
(h) Inspect the front switching solenoid operation.
(1) Push in and hold the ºSA1º and ºSA2º switches si-
multaneously, depress strongly and hold the brake
pedal with stable force.
NOTICE:
Do not keep the ºSA1º and ºSA2º pushed down for more
than 10 sec. When operating it continuously, set the inter-
val of more than 20 sec.
(2) Check that the brake pedal cannot be depressed.
If the pedal can be depressed, replace the hydraulic brake
booster.
(3) Release the ºSA1º switch and check that the brake
pedal can be depressed.
If the pedal can not be depressed, replace the hydraulic brake
booster.
(4) Release the ºSA2º switch and check that the brake
pedal can be depressed.
If the pedal can not be depressed, replace the hydraulic brake
booster.
(i) Inspect the right front solenoid operation.
(1) Turn the selector switch to ºRHº position.
(2) Push and hold in the MAIN push switch and ºSA2º
switch simultaneously depress and hold the brake
pedal with stable force.
NOTICE:
Do not keep the MAIN push switch and ºSA2º switch
pushed down for more than 10 sec. When operating it con-
tinuously, set the interval of more than 20 sec.
Page 562 of 3115
F04706
F02828
- BRAKEHYDRAULIC BRAKE BOOSTER
BR-53
2189 Author: Date:
2004 LAND CRUISER (RM1071U)
(e) Place ºSHEET Gº (SST) of ºFRONTº on actuator checker.
SST 09990-00240
(f) Turn the ignition switch OFF, depress the brake pedal
more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes light and stroke becomes longer.
(g) Check that the brake pedal becomes light to depress.
If the pedal does not become to be light to depress, check and
replace the brake line and hydraulic brake booster.
(h) Turn the ignition switch ON, check the pump motor opera-
tion noise.
If the pump motor does not operate, check and replace the wire
harness and pump motor (See page BR-64).
(i) Inspect the front TRAC & VSC solenoid operation.
(1) Push in and hold the ºSA1º and ºSA2º switches si-
multaneously, depress strongly and hold the brake
pedal with stable force.
NOTICE:
Do not keep the ºSA1º and ºSA2º pushed down for more
than 10 sec. When operating it continuously, set the inter-
val of more than 20 sec.
(2) Check that the brake pedal cannot be depressed.
If the pedal can be depressed, replace the hydraulic brake
booster.
(3) Release the ºSA1º switch and check that the brake
pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake
booster.
(4) Release the ºSA2º switch and check that the brake
pedal can be depressed.
If the pedal cannot be depressed, replace the hydraulic brake
booster.
(j) Inspect the right front ABS solenoid operation.
(1) Turn the selector switch to ºRHº position.
(2) Push and hold in the MAIN push switch and ºSA2º
switch simultaneously, depress and hold the brake
pedal with stable force.
NOTICE:
Do not keep the MAIN push switch and ºSA2º switch
pushed down for more than 10 sec. When operating it con-
tinuously, set the interval of more than 20 sec.
Page 568 of 3115
BR12C-05
F04456
F08307
BR-60
- BRAKEHYDRAULIC BRAKE BOOSTER
2196 Author: Date:
2004 LAND CRUISER (RM1071U)
REMOVAL
NOTICE:
Before starting the work, make sure that the ignition switch
is OFF and depress the brake pedal more than 40 times.
HINT:
When a pressure in power supply system is released, reaction
force becomes light and stroke becomes longer.
NOTICE:
As high pressure is applied to the brake actuator tube
No. 1, never deform it.
Until the work is over, do not turn the ignition switch
ON.
1. DRAW OUT FLUID WITH SYRINGE
NOTICE:
Do not let brake fluid remain on a painted surface. Wash it
off immediately.
2. REMOVE SCUFF PLATE, COWL SIDE TRIM, LOWER
NO. 1 PANEL, LH LOWER PANEL AND NO. 2 HEATER
TO REGISTER DUCT (See page BO-81)
3. REMOVE ABS OR ABS & TRAC & VSC ECU
Remove the 2 nuts and ABS or ABS & TRAC & VSC ECU.
Torque: 5.0 N´m (51 kgf´cm, 44 in.´lbf)
4. w/ ABS only:
DISCONNECT 4 CONNECTORS
5. w/ ABS & TRAC & VSC only:
DISCONNECT 5 CONNECTORS
Page 597 of 3115
- BRAKETROUBLESHOOTING
BR-3
2139 Author: Date:
2004 LAND CRUISER (RM1071U) Noise from brakes
1. Pad (Cracked or distorted)
2. Installation bolt (Loose)
3. Disc (Scored)
4. Pad support plate (Loose)
5. Sliding pin (Worn)
6. Pad (Dirty)
7. Pad (Glazed)
8. Tension or return spring (Faulty)
9. Anti-squeal shim (Damaged)
10.Shoe hold-down spring (Damaged)BR-15
BR-24
BR-18
BR-27
BR-21
BR-30
BR-24
BR-27
BR-15
BR-24
BR-15
BR-24
BR-33
BR-15
BR-24
BR-33
Noise from hydraulic brake booster
(Abnormal pump motor operation noise)Accumulator bracket clearance (Out of adjustment)BR-66
Brake warning light lights up*1
(Parking brake pedal released)
1. Brake fluid level
2. Hydraulic brake booster power supply system (Faulty)-
BR-40
Brake warning light lights up and brake warning buzzer sounds*2Hydraulic brake booster power supply system (Faulty)BR-40
ABS warning light lights up*31. Anti - lock brake system (Faulty)
2. Hydraulic brake booster power supply system (Faulty)-
BR-40
*1, *3: The light may stay on for about 60 seconds after the engine is started. It is normal if it goes out after
a while.
*
2, *3: Depressing the brake pedal repeatedly may turn on the warning light and buzzer. It is normal if the
light goes off and the buzzer stops sounding after a few seconds.
*
3: While ABS warning light is ON.
Page 764 of 3115
F17763
EXI
WT A43
A43 IX1
F15Cowl Side J/B RH
Cowl Side J/B RH Cowl Side J/B RH
Cowl Side J/B LHI18
Ignition SW
Engine Room J/BCombination MeterABS & BA & TRAC
& VSC ECU
SB
D4
Detection SW
(Center Diff. Lock)
2
W-B
P-B
SB
SB
SB MET1
2
47
3E3Q
56 3
3Q
3B
3Q3B J4
J/C
B-R B-R
A
AP-B
L-R
W-R AM2 IG2
76
41 10
2E 2A
1
9
1C1B
2 B-G
ECFL Block
Battery MAIN
EC BR W-R8IX1
VSC OFF
17
C13 C12 C151
103
7
14 26
AM2 DI-624
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
817 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC Always ON Malfunction in ECU
VSC TRAC Warning Light Circuit
CIRCUIT DESCRIPTION
Always ONThere is a malfunction in the ECU internal circuit.
Power source circuit
Skid control ECU
VSC TRAC warning light circuit
HINT:
If the fail safe function is activated in the VSC system, ºVSC OFFº indicator light lights up.
WIRING DIAGRAM
DICA4-01
Page 765 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-625
818 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 for VSC?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code.
NO
3 Does VSC TRAC 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 16 V
NG Check and repair the charging system.
OK
Page 766 of 3115
DI-626- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
819 Author: Date:
2004 LAND CRUISER (RM1071U)
5 Check operation of the VSC TRAC 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 VSC TRAC warning light can be shown on the combination meter on 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) Turn the ignition switch ON.
CHECK:
Check that the VSC TRAC warning light goes off.
NG Check and replace combination meter (See
page BE-2).
OK
6Check 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.
