TOYOTA AVALON 2001 Service Repair Manual
Page 711 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-341
497 Author: Date:
2001 AVALON (RM808U)
4 Check for open and short circuit in harness and connector between ABS & BA &
TRAC & VSC ECU and VSC buzzer (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 712 of 1897
F09820
ABS & BA &
TRAC & VSC ECU
A20
A20CSW
69
J6
J/CWT V8
VSC OFF
Switch
44
Y-RW-L
W-B14 J/B No. 4
4A
4D
4F 4H4F
4D21 8
4 16
16
13 Y-R W-B
Multi Display
M6 M747
R-B
B
BR-B
Driver Side J/B
1G1
1D10
1B3
1C4
34 12 IG1 RelayGAUGE
No. 1
W-R 2
IG1 AM1
4 Ignition Switch
W-L W
IF1 7
W-L
5
5 1 2AM1 Engine Room R/B No. 5
B
2G 2H1
1
B-LW-B
IG II W-B
Battery
FL MAIN
B
F61 F10F81 1
ALT
FL
Block
VSC OFF
Engine Room J/B DI-336
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
492 Author: Date:
2001 AVALON (RM808U)
VSC OFF Indicator Light, VSC OFF Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC & VSC control main switch. When the VSC OFF switch is pressed, TRAC & VSC control
is deactivated and the VSC OFF indicator light lights up. By turning off the ignition switch, TRAC & VSC con-
trol is surely activated when the ignition switch turns ON next time. Also, the VSC OFF indicator light truns
ºONº when the ECU prohibit TRAC & VSC controls.
WIRING DIAGRAM
DI6OM-03
Page 713 of 1897
F00052
(+) (-) 41
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-337
493 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in case
of not using the TOYOTA hand-held tester.
1 Check operation of the VSC OFF indicator light.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC OFF indicator light can be shown on the combination meter with the
TOYOTA hand-held tester.
NG Go to step 4.
OK
2 Check VSC OFF switch.
PREPARATION:
(a) Remove the VSC OFF switch.
(b) Disconnect the VSC OFF switch connector.
CHECK:
Measure the resistance between terminals 1 and 4 of the VSC
OFF switch when the VSC OFF switch is ON and OFF.
OK:
VSC OFF switchResistance
PressedContinuity
Released1MW or higher
NG Replace VSC OFF switch.
OK
Page 714 of 1897
DI-338
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
494 Author: Date:
2001 AVALON (RM808U)
3 Check for open and short circuit in harness and connector between terminal
CSW of ABS & BA & TRAC & VSC ECU and VSC OFF switch and body ground
(See page IN-30).
NG Repair or replace harness or connector.
OK
4 Check VSC OFF indicator light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
5 Check for open and short circuit in harness and connector between terminal WT
of ABS & BA & TRAC & VSC ECU and VSC OFF indicator light (See page
IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 715 of 1897
F09818
ABS & BA &
TRAC & VSC ECU
VSCW A2070
P-B
R-B 15
4D
4F 134 4F15
4C P-BJ/B No. 4
M6 M6
R-B4
10 Multi Display
Driver Side J/B
1G1
1D 10
1B3
1C4
3
4 12 IG1 RelayGAUGE
No. 1
W-R 2
IG1 AM1
4 Ignition Switch
W-L W
IF1
7
W-L
5
5 1 2AM1 Engine Room R/B No. 5
B2G 2H11W-B
IG B-L
Battery
FL MAIN
B
F61 F10 F81 1
ALT
FL BlockVSC
Engine Room J/B
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-327
483 Author: Date:
2001 AVALON (RM808U)
VSC Warning Light Circuit
CIRCUIT DESCRIPTION
If the ECU stores DTC to be necessary to shut down VSC operation, the VSC warning light lights on the
combination meter.
WIRING DIAGRAM
DI6OJ-03
Page 716 of 1897
DI-328
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
484 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in case
of not using the TOYOTA hand-held tester.
1 Check operation of the VSC warning light.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC warning light can be shown on the combination meter with the TOYO-
TA hand-held tester.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
2 Is DTC output?
YES Repair circuit indicated by the output code.
NO
3 Check for open and short circuit in harness and connector between ABS & BA &
TRAC & VSC ECU and VSC warning light (See page IN-30).
NG Repair or replace harness or connector.
OK
Page 717 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-329
485 Author: Date:
2001 AVALON (RM808U)
4 Check VSC warning light.
See the combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 718 of 1897
DI6NR-01
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration DataRegistration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
Remains ONDoes not Light Up
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
Check ItemNormal
ABS does not operate.
ABS does not operate efficiently.
Does not Light Up
ABS & BA & VSC Check Sheet
BA does not operate. VSC does not operate. (Wheels spin when starting rapidly.)
ABS Warning Light
Abnormal
Remains ON
Does not Light Up
Remains ONDoes not Light Up
Remains ONDoes not Light Up
Remains ONDoes not Light Up
VSC OFF Indicator
Light Abnormal
SLIP Indicator
Light AbnormalVSC Warning
Light Abnormal
BRAKE Warning
Light Abnormal
Malfunction
Indicator Light
TRAC does not operate.
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-251
407 Author: Date:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK
Page 719 of 1897
DI6NT-03
DI-258
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
414 Author: Date:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
NOTICE:
When removing the part, turn the ignition switch OFF.
When replacing the steering angle sensor or ECU, make sure to perform steering angle sensor
zero point calibration.
HINT:
Using SST 09843-18020, connect the terminals Tc and E1.
If any abnormality is not found when inspecting parts, inspect the ECU.
If a malfunction code is displayed during the DTC check, check the circuit corresponding the code. For
details of each code, refer to the page under respective ºDTC No.º in the DTC chart.
DTC chart of ABS system:
DTC No.
(See Page)Detection ItemTrouble Area
C0278 / 11
(DI-280)Open or short circuit in ABS solenoid relay circuitABS solenoid relay
ABS solenoid relay circuit
C0273 / 13
(DI-276)Open or short circuit in ABS motor relay circuitABS motor relay
ABS motor relay circuit
C0226 / 21
(DI-273)Open or short circuit in brake actuatorBrake actuator
SFRR or SFRH circuit
C0236 / 22
(DI-273)Open or short circuit in brake actuatorBrake actuator
SFLR or SFLH circuit
C0246 / 23
(DI-273)Open or short circuit in brake actuatorBrake actuator
SRRR or SRRH circuit
C0256 / 24
(DI-273)Open or short circuit in brake actuatorBrake actuator
SRLR or SRLH circuit
C0200 / 31*
(DI-267)Right front wheel speed sensor signal malfunction
C0205 / 32*
(DI-267)Left front wheel speed sensor signal malfunctionRight front, left front, right rear and left rear speed sensor
Eh d i itC0210 / 33*
(DI-267)Right rear wheel speed sensor signal malfunction
Each speed sensor circuit
Speed sensor rotor
C0215 / 34*
(DI-267)Left rear wheel speed sensor signal malfunction
C1330 / 35*
(DI-267)Open circuit in right front speed sensor circuitRight front speed sensor
Right front speed sensor circuit
C1331 / 36*
(DI-267)Open circuit in left front speed sensor circuitLeft front speed sensor
Left front speed sensor circuit
C1237 / 37
(DI-295)Front tires are different from rear in size.Tire size
Speed sensor rotor
C1332 / 38*
(DI-267)Open circuit in right rear speed sensor circuitRight rear speed sensor
Right rear speed sensor circuit
C1333 / 39*
(DI-267)Open circuit in left rear speed sensor circuitLeft rear speed sensor
Left rear speed sensor circuit
C1241 / 41
(DI-297)Low battery positive voltage or abnormally high battery positive
voltageBattery
Charging system
Power source circuit
C1249 / 58
(DI-303)Open circuit in stop light switch circuitStop light switch
Stop light switch circuit
Page 720 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-259
415 Author: Date:
2001 AVALON (RM808U)C1300 / 62
(DI-305)
Malfunction in ABS & BA & TRAC & VSC ECUABS & BA & TRAC & VSC ECU
Always ON
(DI-319)Malfunction in ABS & BA & TRAC & VSC ECU
Open circuit in ABS warning light circuitCharging system
ABS warning light circuit
*: As the DTC cannot be erased only by replacing parts, do either of the following operations.
(1) Clear DTC (See page DI-252).
(2) At a vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
DTC chart of VSC system:
DTC No.
(See Page)Detection ItemTrouble Area
C1225 / 25
(DI-273)Open or short circuit in brake actuator solenoid circuit (SMC1
circuit)Brake actuator
SMC1 circuit
C1226 / 26
(DI-273)Open or short circuit in brake actuator solenoid circuit (SMC2
circuit)Brake actuator
SMC2 circuit
C1227 / 27
(DI-273)Open or short circuit in brake actuator solenoid circuit (SRC1
circuit)Brake actuator
SRC1 circuit
C1228 / 28
(DI-273)Open or short circuit in brake actuator solenoid circuit (SRC2
circuit)Brake actuator
SRC2 circuit
C1301 / 42*Malfunction in communication with the translate ECU
Brake fluid level warning switch circuit
Translate ECU
Translate ECU circuit
ECM
ECM circuit
C0365 / 43
(DI-285)Malfunction in deceleration sensor (combined in yaw rate sen-
sor)Deceleration sensor
Deceleration sensor circuit
C1202 / 44
(DI-290)Brake fluid level low
Open circuit in brake fluid level warning switch circuitBrake fluid level
Brake fluid level warning switch
Brake fluid level warning switch circuit
C1350 / 51
(DI-306)Pump motor is locked
Open circuit in pump motor groundBrake actuator pump motor
Brake actuator pump motor circuit
C1351 / 52
(DI-308)VSC pump motor is locked
Open or short circuit in VSC pump motor circuitPrecharge pump motor
Precharge pump motor circuit
C1246 / 53
(DI-300)Malfunction in master cylinder pressure sensorMaster cylinder pressure sensor
Master cylinder pressure sensor circuit
C1208 / 54
(DI-292)Malfunction in steering angle sensorSteering angle sensor
Steering angle sensor circuit
C0371 / 55
(DI-287)Malfunction in yaw rate sensor circuitYaw rate sensor
Yaw rate sensor circuit
Always ON
(DI-322)Malfunction in ABS & BA & TRAC & VSC ECU
Open circuit in VSC warning light circuitCharging system
VSC warning light circuit
*: Troubleshoot according to the DTC chart of the translate ECU.