Page 888 of 3115
F17765
ABS & BA & TRAC
& VSC ECU
Engine Room J/B Combination Meter
Cowl Side J/B RH
Cowl Side J/B LH
I18
Ignition SW
Cowl Side J/B RHVSCW 4
A43 18
3B 27
3Q
16
C13
41
2E10
2A1B9
1
1C AM2
W-R B-R
C12
C15
ECSB
BR8
IX1 3Q SB7MET
4
3EB-R
B-G
FL Block SB L-W
W-R
76 AM2 IG2
J4
J/C
AA
2
F15Battery 1 10 VSC TRAC
MAIN
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-631
824 Author: Date:
2004 LAND CRUISER (RM1071U)
VSC TRAC Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU stores DTC, the VSC TRAC warning light illuminates the combination meter.
WIRING DIAGRAM
DICA6-02
Page 889 of 3115
DI-632- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
825 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the table below for each trouble symptom.
VSC TRAC warning light does not light up*1
VSC TRAC warning light remains on*2
*1: Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using the hand-held tester.
*
2: After inspection with step 4, start the inspection from step 5 in case of using the hand-held tester and
start from step 6 in case of not using hand-held tester.
1 Check operation of the VSC TRAC warning light.
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.
OK Check and replace skid control ECU.
NG
2 Does the warning lights other than VSC TRAC warning light come on?
YES Repair VSC TRAC warning light bulb or com-
bination meter assembly.
NO
Page 891 of 3115
DI-634- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
827 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
5 Check operation of the VSC TRAC warning light (See step 1).
OK Check and replace skid control ECU.
NG
6 Is DTC output?
Check the DTC on page DI-505.
YES Repair circuit indicated by the output code.
NO
7Check for short circuit in harness and connector between VSC TRAC warning light and
skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and repair skid control ECU.
Page 892 of 3115
DIC8P-01
ABS & EBD & BA Check SheetInspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration DateRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuouslyIntermittently ( times a day)
ABS does not operate.
ABS does not operate efficiently.
ABS Warning Light
AbnormalRemains ONDoes not light up
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
Brake Warning
Light Abnormal
(PKB released)Remains ONDoes not light up
BA does not operate.
EBD does not operate.
STOP LIGHT SW
SYSTEM
Freeze Frame Data
#IG ON
VEHICLE SPDON
OFF
NO SYS
ABS
BA
FAIL SF
km/h
MPH
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-503
696 Author: Date:
2004 LAND CRUISER (RM1071U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 893 of 3115
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration DateRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
TRAC does not operate. (Wheels spin when starting rapidly.)
DisplaysDoes not display
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
Light Abnormal TRAC OFF Indicator
Light Abnormal SLIP Indicator
Remains ONDoes not light up
Check Item
NormalMalfunction Code (Code )
NormalMalfunction Code (Code )
ABS Warning Light
Malfunction
Indicator Light TRAC & VSC Check Sheet
Remains ONDoes not light up
VSC does not operate. (Wheels sideslip at the time of sharp turning.)
VSC TRC Warning
Indicator Abnormal
Skid Control
Buzzer AbnormalDoes not soundSounds
VSC/TRC OFF SW
SYSTEMFreeze Frame Data
SHIFT POSITION
YAW RATON
OFF
VSC/TRC
P, NR
D
deg/s
VFAIL
23
4L
MAS CYL PRESS
THROTTLE
MAS PRESS GRADE
G (RIGHT&LEFT)
G (BACK&FORTH)
STEERING ANG
deg
deg
MPa/s
G
G DI-504
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
697 Author: Date:
2004 LAND CRUISER (RM1071U)
Page 895 of 3115
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-519
712 Author: Date:
2004 LAND CRUISER (RM1071U)C1238 / 38
(DI-615)
Foreign matter is attached on the tip of the right rear sensorRight front, left front, right rear, left rear speed sensor
C1239 / 39
(DI-615)Foreign matter is attached on the tip of the left rear sensor
Right front, left front, right rear, left rear s eed sensor
Sensor rotor
C1241 / 41
(DI-558)Low battery positive voltage or abnormally high battery
positive voltageBattery
IC regulator
Power source circuit
C1242 / 42*2
(DI-561)Open in IG2 circuit
Battery
IC regulator
Power source circuit
C1243 / 43
(DI-564)Malfunction in deceleration sensor (constant output)Deceleration sensor
Wire harness for deceleration sensor system
C1244 / 44
(DI-567)Open or short in deceleration sensor circuitDeceleration sensor
Deceleration sensor circuit
C1245 / 45
(DI-564)Malfunction in deceleration sensorDeceleration sensor
Wire harness for deceleration sensor system
C1246 / 46
(DI-570)Malfunction in master cylinder pressure sensorMaster cylinder pressure sensor
Master cylinder pressure sensor circuit
C1249 / 49
(DI-573)Open in stop light switch circuitStop light bulb
Stop light switch circuit
C1251 / 51*2
(DI-577)
Pump motor is locked
Open circuit in pump motor groundHydraulic brake booster pump motor
C1252 / 52*2
(DI-580)Hydraulic brake booster pump motor malfunction
Hydraulic brake booster pump motor
Hydraulic brake booster pump motor circuit
Pressure switch (PH or PL)
C1253 / 53*2
(DI-586)Hydraulic brake booster pump motor relay malfunction
ABS motor1 or ABS motor 2 relay
ABS motor1 or ABS motor 2 relay circuit
Hydraulic brake booster pump motor circuit
C1254 / 54*2
(DI-592)Pressure switch malfunctionPressure switch (PH or PL)
Pressure switch circuit
C1256 / 56*2
(DI-595)Accumulator low pressure malfunction
Accumulator
Pressure switch (PH or PL)
Hydraulic brake booster pump motor
C1257 / 57*2
(DI-602)Power supply drive circuit malfunction
Battery
Power source circuit
Skid control ECU
C1203 / 59
(DI-536)ECM communication circuit malfunction
TRC+ or TRC- circuit
ENG+ or ENG- circuit
ECM
C1268 / 68
(DI-605)Transfer L4 position signal transmission failureTransfer L4 position switch
Transfer L4 position switch circuit
Always ON
(DI-621)Malfunction in skid control ECU
Battery
IC regulator
Power source circuit
Skid control ECU
*1: As the DTC cannot be erased by replacing parts alone do either of the following operations.
(1) Clear the DTC (See page DI-505).
(2) At a speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
*
2: Using the following table, troubled parts can be specified.
Page 896 of 3115
ECU
Power source* Hydraulic brake booster Motor relay circuit Accumulator malfunction
Pump motor circuit Pressure switchPH
PL
Pump motor
MTT wire harness
MT+ wire harness
MT- wire harness
MR1 open circuit
MR2 open circuit
MR1 welded contact
MR2 welded contact
Pressure leaks
IG2 open circuit
Power supply circuit
Light Buzzer Light Light Light Light Light LightBuzzer Buzzer Buzzer Buzzer Buzzer Buzzer
DTC
BRAKE warning light and buzzerC1242/42 C1251/51 C1252/52 C1253/53 C1254/54 C1256/56 C1257/57
*: When IG1 circuit is open, the ABS warning light and BRAKE warning light come on.
DI-520
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
713 Author: Date:
2004 LAND CRUISER (RM1071U)
Table of Trouble Part and DTC:
Page 897 of 3115
- 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 sensorSteering angle sensor
Steering angle sensor circuit
C1232 / 32
(DI-551)Malfunction in deceleration sensorDeceleration sensor
Deceleration sensor circuit
C1233 / 33
(DI-553)Open or short in yaw rate sensor circuitYaw rate sensor
Yaw rate sensor circuit
C1234 / 34
(DI-553)Malfunction in yaw rate sensorYaw rate sensor
Yaw rate sensor circuit
C1335 / 35
(DI-546)Open circuit in steering angle sensorSteering 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 undoneSteering angle sensor zero point calibration
Yaw rate sensor zero point calibration
C1340 / 47
(DI-612)Open circuit in center differential lock signalCenter 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 circuitPower 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.
