Page 851 of 3115
F06042
LOCKON
PLG
PL
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-599
792 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check for open circuit in harness and connector between pressure switch (PH)
and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace hydraulic brake booster assembly.
5 Check pressure switch (PL) operation.
PREPARATION:
(a) Turn the motor switch OFF, and depress the brake pedal
40 times or more.
HINT:
When pressure in the power supply system is released, reac-
tion force becomes light and stroke becomes longer.
(b) Install the LSPV gauge (SST) to the rear brake caliper
and bleed air.
SST 09709 -29018
(c) Disconnect the connector (8P) from the hydraulic brake
booster.
CHECK:
While checking the resistance between terminals PL and PLG
of the hydraulic brake booster, depress the brake pedal with a
force of more than 294 N (30 kgf, 66 lbf) and turn the ignition
switch ON, then check the rear wheel cylinder pressure when
the resistance changes from 5.7 kW to 1.0 kW.
OK:
9,022 to 15,102 kpa (92 to 154 kgf´cm2, 1,308 to 2,190
psi)
PREPARATION:
Turn the ignition switch OFF and disconnect the connector (8P)
from the hydraulic brake booster.
CHECK:
While checking the resistance between terminals PL and PLG
of the hydraulic brake booster, depress the brake pedal chang-
ing the force in a range of 197 N (20 kgf, 44 lbf) to 294 N (30 kgf,
66 lbf) and check the rear wheel cylinder pressure when resis-
tance changes from 1.0 kW to 5.7 kW.
OK:
8,532 to 13,337 kpa (87 to 136 kgf´cm2, 1,237 to 1,934
psi)
Page 862 of 3115
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
Page 865 of 3115
- 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
Page 874 of 3115
F17775
ABS & BA & TRAC
& VSC ECU
IND A43 IG1 12
L-B L-B
IU412
SB
C13 Combination Meter
15
Slip
2E 41
2A 10 Cowl Side J/B LH Engine Room J/B
1B9AM2
1C1
I18
Ignition SW
AM2 IG2 W-RB-R
6
7
C1210
SB
3Q7MET
3E4 Cowl Side J/B RH
B-RJ4
J/C
AA
C151
SB
IX18
BR
EC
F152
MAIN FL Block
Battery6
W-R
B-G
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-639
832 Author: Date:
2004 LAND CRUISER (RM1071U)
SLIP Indicator Light Circuit
CIRCUIT DESCRIPTION
The SLIP indicator blinks during VSC operation.
WIRING DIAGRAM
DICA8-02
Page 875 of 3115
F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
DI-640- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
833 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Do the warning lights other than SLIP indicator light come on?
YES Go to step 3.
NO
2 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).
Page 876 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-641
834 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check SLIP indicator light.
Check if that the open circuit in the combination meter circuit (See page BE-58).
NG Repair SLIP indicator light bulb or combination
meter assembly.
OK
4Check for short circuit in harness and connector between SLIP indicator light and skid
control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and repair skid control ECU.
Page 877 of 3115
F17760
J/B No. 7 D1
DLC1
Cowl Side J/B LH Cowl Side
J/B RHTC TC
E1
TC
CGA42 7D
7B 7D
IF
2D II EB3BP-B
W-BP-B P-B
W-B
W-B
W-B
1D7
DLC3
18
4 114
5
311
3
13ABS & BA & TRAC
& VSC ECU
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-651
844 Author: Date:
2004 LAND CRUISER (RM1071U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 or Tc and CG of the DLC3 causes the ECU to display the DTC
by flashing the ABS warning light and VSC TRAC warning light.
WIRING DIAGRAM
DICAC-01
Page 878 of 3115
F05490
E1
Tc (-) (+) DLC1 ONON
DLC3
(-) (+)
Tc
CG
DI-652- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
845 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1 or Tc and CG of DLC3.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals Tc and E1 of the
DLC1 or Tc and CG of the DLC3.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Tc
and E
1 are connected, the ECU may be defec-
tive.
NG
2 IG switch OFF, and check for open and short circuit in harness and connector
between skid control ECU and DLC1 or DLC3, DLC1 or DLC3 and body ground
(See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.
