TOYOTA LAND CRUISER 1998 Factory Repair Manual

F02833
2121 LOCK
DI-618- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
811 Author
: Date
:
2004 LAND CRUISER (RM1071U)
OK:
Resistance: 1 MW or higher
Rear:
PREPARATION:
(a) Make sure that there is no looseness at the connector's
locking part and connecting part of the connector.
(b) Disconnect the speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 1.0 to 1.4 kW
CHECK:
Measure resistance between terminal 1 or 2 of the speed sen-
sor connector and body ground.
OK:
Resistance: 1 MW or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-505).
OK
3 Check for open and short circuit in harness and connector between each speed
sensor and ECU (See page IN-36).
NG Repair or replace harness or connector.
OK

BR3795
OK NG
W04200
Normal Signal Waveform
1 V / Division2 m/s / DivisionGND
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-619
812 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check sensor installation.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and front steering
knuckle or rear axle carrier.
Torque: 8.0 N´m (82 kgf´cm, 71 in.´lbf)
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-505).
OK
5 Check speed sensor and sensor rotor serrations.
(REFERENCE) INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the skid control ECU with connectors still con-
nected.
(b) Connect the oscilloscope to each of terminals FR+ - FR-,
FL+ - FL-, RR+ - RR- or RL+ - RL- of the skid control
ECU.
CHECK:
Drive the vehicle at about 12 mph (20 km/h), and check the sig-
nal waveform.
HINT:

As vehicle speed (rpm of the wheels) increase, a cycle of
the waveform narrows and the fluctuation in the output
voltage becomes greater.

When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor's scratches, looseness or foreign matter depos-
ited on it.
OK Check and replace skid control ECU.
NG

R07880
F04443
DI-620- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
813 Author
: Date
:
2004 LAND CRUISER (RM1071U)
6 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the front axle hub (See page SA-12).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign matter.
PREPARATION:
Remove the front speed sensor (See page BR-69).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
HINT:
If foreign matter (including that on the sensor rotor side) is iden-
tified, remove it and after reassembling, check the output ware-
form.
Rear:
PREPARATION:
Remove the rear axle shaft (See page SA-84).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign matter.
PREPARATION:
Remove the rear speed sensor (See page BR-72).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
HINT:
If foreign matter (including that on the sensor rotor side) is iden-
tified, remove it and after reassembling, check the output ware-
form.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI-505).
OK
Check and replace skid control ECU.

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

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).

- 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.

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

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.

F17759
INFR Combination Meter
Cowl Side J/B RH
Engine Room J/B
Cowl Side J/B LHI18
Ignition SW
FL Block
MAIN TRAC15
A43 IG1 IU4
C13 C12
MET
AM2
9 1
F15 3E 3Q
1C1B
2A2E IG2AM2
Battery SB
B-R B-R
B-R B-R SB
W-R
21041 6
7 A AJ4
J/C
B-GABS & BA & TRAC
& VSC ECU
W-R 13 13 18 10
74 DI-642
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
835 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TRAC Indicator Light Circuit
CIRCUIT DESCRIPTION
The TRAC indicator light blinks during TRAC operation.
WIRING DIAGRAM
DICA9-02

F00044
1
2
3 4
(+) (-) Continuity1 2
3 4
1
2
3 4 Open
Continuity
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-643
836 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Do the warning lights other than TRAC 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).