TOYOTA LAND CRUISER 1998 Factory Repair Manual

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)

DI-600- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
793 Author
: Date
:
2004 LAND CRUISER (RM1071U)
HINT:
After inspection, connect the connector, fill brake reservoir with
brake fluid and clear the DTC (See page DI-505).
NG Replace hydraulic brake booster assembly.
OK
6 Check pressure switch (PH) and pressure switch (PL)
CHECK:
Compare the pressure value of the rear wheel cylinder measured in check pressure switch (PL) operation
with the one measured in check pressure switch (PH) operation.
OK:

Pressure when the voltage between PH and PHG becomes 6 to 0 V > pressure when the resis-
tance between PL and PLG becomes 5.7 kW to 1.0 kW.

Pressure when the resistance between PH and PHG becomes 0 kW to 1 kW > pressure when
the resistance between PL and PLG becomes 1.0 kW to 5.7 kW.
NG Replace hydraulic brake booster assembly.
OK
Check and replace skid control ECU.
7 Check for open or short circuit in harness and connector between hydraulic
brake booster pump motor and hydraulic brake booster (See page IN-36).
NG Replace wire harness.
OK

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-601
794 Author
: Date
:
2004 LAND CRUISER (RM1071U)
8 Check hydraulic brake booster pump motor (See page BR-64).
NG Replace hydraulic brake booster pump motor.
OK
Replace
hydraulic brake booster.

F17758
Cowl Side J/B LH BatteryEngine Room J/B
Cowl Side J/B LH
Cowl Side J/B RH J4
J/C
Cowl Side J/B LH
IG1 No. 2 Relay
ECU-IG1
AM1
ALT
MAINFL Block
EE IFIG2
IG1
GND4
GND3
GND1
GND2 A44
A42
A42 A42
A41
A41 2A
2B3
13 J/B No. 2
IFF15 F16
2 12C1
2E 2E
2B
3918 37
12
533B 3E22 4IGN2A
2E41 10 1
1C 1B9 AM2
W-R
B-R B-R
B-R B-G
W-R
L-B
B-R
AA
B-G
W-B B-W
W-B
W-B 4
62
7 IG1
AM1
AM2 IG2
W-B
22
6
17
8
31
6 ABS & BA & TRAC
& VSC ECU
W-B
W-B
W-B
W-B
W-B I18
Ignition SW
DI-602- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
795 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1257 / 57 Power Supply Drive Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1257 / 57When a malfunction inside ECU is detected.

Battery

Power source circuit

Skid control ECU
WIRING DIAGRAM
DIC9Y-01

F09165
GND1GND2
IG1 GND3
GND4
(-)(+) ON
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-603
796 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system.
OK
2 Check voltage of the ECU IG power source.
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 DATA LIST mode on the hand-held tester.
CHECK:
Check the voltage condition output from the ECU displayed on the hand-held tester.
OK:
ºNormalº is displayed.
In case of not using the hand-held tester:
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of the
skid control ECU connector.
OK:
Voltage: 10 to 14 V
OK Turn ignition switch OFF, check and replace
skid control ECU.
NG

F02836
GND1
GND2GND3
GND4
F04448
Driver Side J/B
ECU-IG
DI-604- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
797 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3 Check continuity between terminal GND of skid control ECU connector and body
ground.
CHECK:
Measure resistance between terminal GND of the skid control
ECU connector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
4 Check ECU-IG fuse.
PREPARATION:
Remove the ECU-IG fuse from the driver side J/B.
CHECK:
Check continuity of the ECU-IG fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ECU-IG fuse (See at-
tached wiring diagram).
OK
Check for open circuit in harness and connector between skid control ECU and battery (See page
IN-36).

F17749
ABS & BA & TRAC
& VSC ECU
EXI2 A432
B-L
3B 20
3Q54Cowl Side J/B RH
SB
IX15
B-L
32
B-L
EB13
B-LD5
Detection SW
1
2R-L
EB111
R-L
IN214
R-L
Ib26
R-L
3E3 GAUGE2
3 5
21 IG1 No.3 Relay
3C1
3Q 39
2E 39AM1
2C
II F161B-G
J/B No.2
ALT
J/B No.3 B-G
SB
B-R 2Q77
2E 37Cowl Side J/B LH
L-B
I18
Ignition SW
42IG1 AM16D J/B No.6
6D31
1 Cowl Side J/B RH
FL Block
F171
Battery Cowl Side J/B LH
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-605
798 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1268 / 68 Transfer L4 Position Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1268 / 68Open or short circuit in transfer L4 position switch.
Transfer L4 position switch

Transfer L4 position switch circuit
WIRING DIAGRAM
DIC9Z-01

F17610
EXI2
(-)
(+) ON
DI-606- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
799 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
1 Check voltage between terminal EXI2 of skid control ECU and body ground.
PREPARATION:
Remove the skid control ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure voltage between terminal EXI2 of the skid con-
trol ECU and body ground when the transfer is in the L4
position.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms chart (See page DI-526).
NG
2 Check transfer L4 position switch ( See page TR-49).
NG Replace transfer L4 position switch.
OK
3 Check for open or short circuit in harness and connector between transfer L4
position switch and skid control ECU ( See page IN-36).
NG Repair or replace harness or connector.
OK

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-607
800 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Check for open or short circuit in harness and connector between skid control
ECU and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

DI-608- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
801 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC C1290 / 66 Zero Point Calibration of Steering Sen-
sor Undone
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1290 / 66
The steering sensor zero point calibration position vastly
differs from the recorded value.
(The angle becomes larger)
Yaw rate sensor zero point calibration undone

Steering angle sensor zero point calibration undone
INSPECTION PROCEDURE
1 Perform zero point calibration. (See page DI-505)
HINT:
This code is output when a problem occurs in a zero point calibration of the steering angle sensor and yaw
rate sensor.
Therefore, clear the stored zero point calibration data and correct the zero points.
(a) Clear the zero point calibration data.
(b) Perform a zero point calibration of the steering sensor and yaw rate sensor.
NEXT
2 Is DTC output?
(a) Clear the DTCs.
(b) Turn the ignition switch to the ON position.
(c) Are the same DTCs detected?
NO Proceed to next circuit inspection shown in
problem symptoms table.
YES
No problem.
HINT:
When the registered data is not equal to the input data, the DTC will be output.
DICA0-01