1998 TOYOTA LAND CRUISER steering

- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-521
714 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC chart of VSC:
DTC No.
(See Page)Detection ItemTrouble Area
C1231 / 31
(DI-546)Malfunction in steering angle sensor
Steering angle sensor

Steering angle sensor circuit
C1232 / 32
(DI-551)Malfunction in deceleration sensor
Deceleration sensor

Deceleration sensor circuit
C1233 / 33
(DI-553)Open or short in yaw rate sensor circuit
Yaw rate sensor

Yaw rate sensor circuit
C1234 / 34
(DI-553)Malfunction in yaw rate sensor
Yaw rate sensor

Yaw rate sensor circuit
C1335 / 35
(DI-546)Open circuit in steering angle sensor
Steering angle sensor

Steering angle sensor circuit
C1210 / 36
(DI-538)Zero point calibration of yaw rate sensor undone

Yaw rate sensor

Yaw rate sensor circuit

PNP switch circuit (P position)
C1336 / 39
(DI-609)Zero point calibration of deceleration sensor undone

Deceleration sensor

Deceleration sensor circuit

PNP switch (P position) circuit
C1223 / 43
(DI-540)Malfunction in ABS control systemABS control system
C1224 / 44
(DI-541)Open or short in NE signal circuit

NEO circuit

ECM

Skid control ECU
C1290 / 66
(DI-608)Zero point calibration of steering sensor undone
Steering angle sensor zero point calibration

Yaw rate sensor zero point calibration
C1340 / 47
(DI-612)Open circuit in center differential lock signal
Center differential lock system

Center differential lock circuit
C1201 / 51
(DI-535)ECM system malfunctionEngine control system
C1203 / 53
(DI-536)ECM communication circuit malfunction

TRC+ or TRC- circuit

ENG+ or ENG- circuit

ECM
Always ON
(DI-627)Malfunction in skid control ECU
Open in VSC TRAC warning light circuit
Power source circuit

VSC TRAC warning light circuit
HINT:
There is a case that TOYOTA hand-held tester cannot be used when the VSC TRAC warning light is always
on.

DIC8X-01
F17606
ABS Motor 1
Relay
ABS Motor 2
RelayABS Solenoid
Relay
Master Cylinder Pressure Sensor
Hydraulic Brake Booster
Check
Connector
Front Speed
Sensor Rotor
Front Speed Sensor
Engine Room J/BNeutral Start SwitchRear Speed Sensor
RotorRear Speed
Sensor
Steering Angle Sensor
Engine and ECT
ECU
Yaw Rate Sensor and
Deceleration Sensor DLC3
Stop Light Switch Skid Control ECU with
Warning Buzzer Combination Meter

ABS Warning Light

VSC TRC Warning Light

BRAKE Warning Light

VSC OFF Indicator Light

SLIP Indicator Light

ACTIVE TRC
Indicator Light
DI-522- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
715 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PARTS LOCATION

DI-508- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
701 Author
: Date
:
2004 LAND CRUISER (RM1071U)WHEEL SPD FL
Front Left wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
WHEEL SPD RRRear Right wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
WHEEL SPD RLRear Left wheel speed/
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer
DECELERAT SENSG sensor (GL1 filter)/
Min.: -1.869 G, Max.: 1.869Approximately 0 ± 0.13 G at still
conditionReading changes when vehicle is
bounced
DECELERAT SENS2G sensor (GL2 filter)/
Min.: -1.869 G, Max.: 1.869Approximately 0 ± 0.13 G at still
conditionReading changes when vehicle is
bounced
IG VOLTAGEECU IG power voltage/
UNDER or NORMAL or OVER--
SFRRSFRR/ ON or OFF--
SFRHSFRH/ ON or OFF--
SFLRSFLR/ ON or OFF--
SFLHSFLH/ ON or OFF--
SRRR (SRR)SRRR (SRR)/ ON or OFF--
SRRH (SRH)SRRH (SRH)/ ON or OFF--
SRLRSRLR/ ON or OFF--
SRLHSRLH/ ON or OFF--
SRCF (SA1)SRCF (SA1)/ ON or OFF--
SRCR (SA2)SRCR (SA2)/ ON or OFF--
SRMF (SMCF, SA3)SRMF (SMCF, SA3)/ ON or OFF--
SRMR (SMCR, STR)SRMR (SMCR, STR)/ ON or OFF--
THROTTLEThrottle position sensor/
Min.: 0 deg, Max.: 125 deg--
ENGINE SPDEngine Speed/
Min.: 0 rpm, Max.: 6000 rpmActual engine speed-
YAW R AT EYaw rate sensor/
Min.: -128 deg/s, Max.: 128 deg/s--
YAW ZERO VALUEMemorized zero value/
Min.: -128 deg/s, Max.: 128 deg/s--
STEERING ANG
Steering sensor/
Min.: -1682 deg,
Max.: 1877 deg
-1682 to 1877 deg
Turning the steering wheel
changes the value
Left : Becomes grater
Right : Becomes smaller
MAS CYL PRS 1Master cylinder pressure 1/
Min.: 0 V, Max.: 5 VWhen brake pedal is released:
0.3 - 0.9 VReading increases when brake
pedal is depressed
AIR BLD SUPPORTAir bleed support/
NOT SUP or SUPPORTw/ BA: Supported
w/ VSC: Not supported-
TEST MODETest mode operation/
NORMAL or TESTNORMAL: Normal mode
TEST: During test mode-
#CODESNumber of Trouble Code/
Min.: 0, Max.: 255MIn.: 0, Max.: 45-

DI-510- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
703 Author
: Date
:
2004 LAND CRUISER (RM1071U)SRMF & SRMR
Turns ABS solenoid SRMF & SRMR ON / OFFOperation of solenoid (click-
ing sound) can be heard
SOL RELAYTurns ABS solenoid relay ON/OFFOperation of solenoid (click-
ing sound) can be heard
ABS MOT RELAYTurns ABS motor relay ON/OFFOperation of motor (clicking
sound) can be heard
TRAC MOT RELAYTurns TRC motor relay ON/OFFOperation of motor (clicking
sound) can be heard
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination meter
VSC WARN LIGHTTurns VSC warning light ON / OFFObserve combination meter
VSC/ TRC OFF INDTurns VSC / TRC OFF indicator ON / OFFObserve combination meter
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination meter
BRAKE WRN LIGHTTurns BRAKE warning light ON / OFFObserve combination meter
VSC/BR WARN BUZTurns VSC / BRAKE warning buzzer ON / OFFBuzzer can be heard
4. FREEZE FRAME DATA
(a) The vehicle (sensor) status memorized during ABS and/or VSC operation or at the time of error code
detection can be displayed by the hand-held tester.
(b) Only one record of freeze frame data is stored and the freeze frame data generated during ABS and/or
VSC operation are constantly updated. Also, the number of the ignition switch's ºONº after the freeze
frame data is stored can be memorized up to 31 and it can be displayed.
HINT:
If the ignition switch ºONº operation exceeds 31 times, º31º appears on the display.
(c) If the diagnosis code abnormality occurs, the freeze frame data at the occurrence of the abnormality
is stored but the ABS actuation data is deleted.
Hand-held tester displayMeasurement ItemReference Value*
VEHICLE SPDWheel speed sensor readingSpeed indicated on speedometer
STOP LIGHT SWStop light switch signalStop light switch ON: ON, OFF: OFF
# IG ONNumber of operations of ignition switch ON after
memorizing freeze frame data0 - 31
MAS CYL PRESSMaster cylinder pressure sensor readingBrake pedal release : 0.3 to 0.9 V
Brake pedal depress: 0.8 to 4.5 V
MASS PRESS GRADEMaster cylinder pressure sensor change-30 to 200 MPa/s
SYSTEMSystem status
ABS activated: ABS
VSC/TRC activated: VSC/TRC
BA activated: BA
Fail safe mode activated: FAIL SF
No system activated: NO SYS
YAW R AT EYaw rate angle sensor reading-100 to 100
STEERING ANGSteering sensor readingLeft turn: Increase
Right turn: Drop
THROTTLEThrottle position sensor readingRelease accelerator pedal: Approx. 0 deg.THROTTLEThrottle position sensor readingRelease accelerator edal: A rox. 0 deg.
Depress accelerator pedal: Approx. 90 deg.
G (RIGHT & LEFT)Right and left G-1.869 to 1.869
G (BACK & FORTH)Back and forth G-1.869 to 1.869
VSC (TRC) OFF SWVSC OFF switch signalTRAC OFF SW ON: ON
OFF: OFF

BR3893
Malfunction Code (Example Code 72, 76)
72 6
7
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec. 4 sec.
Repeat DI-512
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
705 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(8) Leaving the vehicle in the stationary condition and
the brake pedal in a free condition for 1 sec. or
more, continue to depress the brake pedal with a
force of 98 N (10 kgf, 22 lbf) or more for 1 sec. or
more.
(9) Leaving the vehicle in the stationary condition, de-
press the brake pedal with a force of 980 N (100 kgf,
221 lbf) or more quickly.
HINT:
At this time, the ABS warning light comes on for 3 sec.
(10) Drive the vehicle straight forward.
When driving the vehicle with a speed faster than 28
mph (45 km/h) for several seconds, check that the
ABS warning light goes off.
HINT:
There is a case that the sensor check is not completed if the ve-
hicle has its wheels spun or its steering wheel turned during this
check.
(11) Stop the vehicle.
(12) Using SST, connect terminals Tc and E
1 of the
DLC1 or Tc and CG of the DLC3.
SST 09843-18020 or 09843-18040
(13) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(14) After doing the check, disconnect the SST from ter-
minals of the DLC1 or terminals of the DLC1 and
DLC3, and turn the ignition switch OFF.
SST 09843-18020 or 09843-18040

F02201
DLC1 E1
TcTs
BR3904
0.13 sec. 0.13 sec.
ON
OFF
F02135
Start Position
End PositionWithin ± 5° DI-514
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
707 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(a) Procedures for test mode:
(1) Turn the ignition switch OFF.
(2) Check that the shift lever is in the P position, and
turn the steering wheel to the neutral position.
(3) Using SST, connect terminals Ts and E
1 of the
DLC1.
SST 09843-18020
(4) Start the engine.
(5) Check that the VSC TRAC warning light blinks.
HINT:
If the VSC TRAC warning light does not blink, inspect the VSC
TRAC warning light circuit and Ts terminal circuit (See page
DI-631 and DI-653).
Turn the steering wheel either to the left or right 450° or
more from the vehicle stationary condition, and turn back
the steering wheel to the straight ahead position.
(b) Keep the vehicle stationary on a level place for 1 sec. or
more.
(c) Check the yaw rate sensor.
Shift the shift lever to the D position and drive the vehicle
at a vehicle speed of approx. 5 km/h (3 mph), turn the
steering wheel either to the left or right 90° or more, and
maintain this angle until the vehicle has turned 180°.
Stop the vehicle and shift the shift lever to the P
position. Check that the VSC buzzer sounds for 3
sec.
If the VSC buzzer sounds, the sensor check is in normal
completion.
If the VSC buzzer does not sound, do the sensor check again.
If the VSC buzzer still does not sound, check the VSC buzzer
circuit, then do the sensor check again.
Trouble AreaSee page
VSC buzzer circuitDI-649
HINT:

Make a 180° turn. At the end of the turn, the direction of
the vehicle should be within 180°± 5° of its start position.

Do not spin the wheels.
(d) Read the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1 or Tc and CG of the DLC3.
SST 09843-18020 or 09843-18040
(2) Read the number of times the VSC TRAC warning
light blinks.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output. (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated.)

DIC91-01
DI-526- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
719 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing the skid control ECU, sensor, etc., turn the ignition switch OFF.
SymptomSuspected AreaSee page
ABS does not operate
BA does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Reconfirm the DTC and check that the normal code is
output.
2. IG power source circuit
3. Speed sensor circuit
4. Check the hydraulic brake booster with a checker or
hand-held tester.
If abnormal, check the hydraulic circuit for leakage (See
page DI-655).
DI-505
DI-558
DI-615
BR-40
ABS does not operate efficiently
BA does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Reconfirm the DTC and check that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic brake booster with a checker or
hand-held tester.
If abnormal, check the hydraulic circuit for leakage (See
page DI-655).
DI-505
DI-615
DI-573
BR-40
ABS warning light abnormal1. ABS warning light circuit
2. Skid control ECUDI-627
IN-36
DTC check cannot be done
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. ABS warning light circuit
2. VSC OFF indicator light, center diff. lock indicator switch
circuit
3. Center diff. lock indicator switch circuit
4. Tc terminal circuit
DI-627
DI-645
DI-612
DI-651
Speed sensor signal check cannot be done1. Ts terminal circuit
2. Skid control ECUDI-653
IN-36
TRAC does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
DI-505
DI-558
DI-655
DI-615
VSC does not operate
Only when 1. to 7. are all normal and the problem is still
occurring, replace the skid control ECU.
1. Check the DTC, reconfirming that the normal code is
output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
5. Deceleration sensor circuit
6. Yaw rate sensor circuit
7. Steering angle sensor circuit
DI-505
DI-558
DI-655
DI-615
DI-570
DI-553
DI-605

DI-524- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
717 Author
: Date
:
2004 LAND CRUISER (RM1071U) BZ (A42 - 2) - GND (A41 - 6,
31, A42 - 8, 17)
L - W-BIG switch ON, VSC buzzer sound can be heardBelow 1.5 V
D/G (A42 - 3) - GND (A41 - 6,
31, A42 - 8, 17)V-W - W-BIG switch ON10 to 14 V
P (A42 - 5) - GND (A41 - 6,
31, A42 - 8, 17)G-W - W-BIG switch ON, shift lever is in P position10 to 14 V
IG1 (A42 - 6) - GND (A41 - 6,
31, A42 - 8, 17)B-W - W-BIG switch ON10 to 14 V
NEO (A42 - 7) - GND (A41 -
6, 31, A42 - 8, 17)W - W-BEngine idlingPulse generation
STP (A42 - 10) - GND (A41 -GW WBStop light switch pushed in10 to 14 VSTP (A42 10) GND (A41
6, 31, A42 - 8, 17)G-W - W-BStop light switch released2 to 5 V
Tc (A42 - 11) - GND (A41 - 6,PB WBIG switch ON and terminals Tc-E1 of DLC1 connectedBelow 1.0 VTc (A42 11 ) GND (A41 6,
31, A42 - 8, 17)P-B - W-BIG switch ON and terminals Tc-E1 of DLC1 not connected10 to 14 V
Ts (A42 - 12) - GND (A41 - 6,WWBIG switch ON and terminals Ts-E1 of DLC1 connectedBelow 1.0 VTs (A42 12) GND (A41 6,
31, A42 - 8, 17)W - W-BIG switch ON and terminals Ts-E1 of DLC1 not connected10 to 14 V
PKB (A42 - 13) - GND (A41 -RW WBIG switch ON, parking brake switch ONBelow 1.5 VPKB (A42 13) GND (A41
6, 31, A42 - 8, 17)R-W - W-BIG switch ON, parking brake switch OFF10 to 14 V
ENG+ (A42 - 14) - ENG -
(A42 - 22)R - GIG switch ONPulse generation
RL+ (A42 - 18) - RL- (A42 -
19)R - GIG switch ON, slowly turn left rear wheelAC generation
RR+ (A42 - 20) - RR- (A42 -
21)B - WIG switch ON, slowly turn right rear wheelAC generation
TRC+ (A42 - 24) - TRC- (A42
- 16)Y - LIG switch ONPulse generation
EXI2 (A43 - 2) - GND (A41 -BL WBIG switch ON, transfer in L4 position8 to 14 VEXI2 (A43 2) GND (A41
6, 31, A42 - 8, 17)B-L - W-BIG switch ON, transfer in any position except L4Below 1.5 V
EXI (A43 - 3) - GND (A41 - 6,PB WBIG switch ON, center diff. lock switch ONBelow 2.0 VEXI (A43 3) GND (A41 6,
31, A42 - 8, 17)P-B - W-BIG switch ON, center diff. lock switch OFF10 to 14 V
VSCW (A43 - 4) - GND (A41 -LW WBIG switch ON, VSC TRAC warning light ONBelow 2.0 VVSCW (A43 4) GND (A41
6, 31, A42 - 8, 17)L-W - W-BIG switch ON, VSC TRAC warning light OFF10 to 14 V
BRL (A43 - 5) - GND (A41 - 6,YG WBIG switch ON, BRAKE warning light ON10 to 14 VBRL (A43 5) GND (A41 6,
31, A42 - 8, 17)Y-G - W-BIG switch ON, BRAKE warning light OFFBelow 2.0 V
IND (A43 - 6) - GND (A41 - 6,LB WBIG switch ON, SLIP indicator light ONBelow 2.0 VIND (A43 6) GND (A41 6,
31, A42 - 8, 17)L-B - W-BIG switch ON, SLIP indicator light OFF10 to 14 V
WT (A43 - 7) - GND (A41 - 6,LR WBIG switch ON, VSC OFF indicator light ONBelow 2.0 VWT (A43 7) GND (A41 6,
31, A42 - 8, 17)L-R - W-BIG switch ON, VSC OFF indicator light OFF10 to 14 V
VYS (A43 - 9) - GYAW (A43 -
27)B - W-RIG switch ON4.5 to 5.5 V
GL2 (A43 - 10) - GYAW (A43 -
27)Y - PIG switch ON, vehicle is placed on the horizontal surface2.0 to 3.0 V
SS1+ (A43 - 14) - SS1- (A43 -
23)W - GEngine idling, slowly turn steering wheelPulse generation
(See page DI-546)
INFR (A43 - 15) - GND (A41 -BR WBIG switch ON, ACTIVE TRAC indicator light ONBelow 1.5 VINFR (A43 15) GND (A41
6, 31, A42 - 8, 17)B-R - W-BIG switch ON, ACTIVE TRAC indicator light OFF10 to 14 V
YD (A43 - 19) - GND (A41 - 6,
31, A42 - 8, 17)L - W-BApprox. 1 sec. after IG switch ON4.5 to 5.3 V