Page 646 of 1897
F09824
Battery
FL MAIN F10 F8
F611 1
ALT
BFL BlockB-L 2G 2H1 1 Engine Room J/B B5512 AM1 Engine Room R/B No. 5 W-LIF17
W-L
2
IG1 AM1 4Ignition Switch W-R W
1C 1G
1B 1D
4
4 3 1
1
2
3 10 GAUGE No. 1 Driver Side J/B
IG1 Relay
W-B
IG
ED CUP
BRAKE
Multi DisplayM6 M3M6R-B
3 4
74D 4F13
4 J/B No. 4
R-B
L-O L-O6
IL1
R-WR-W
R-W
R-W
7
IC13A21
Active
Light
RelayR-Y 8A20
6040 74 68
32 ABS & BA &
TRAC & VSC ECU
FSS LBL PKB EBDW SP1
T5
T5
T5
T5 T5
Y-G
L-B
BR (Shielded)15
25 16
2
11
LBL LVL2PKB2BRL
PKB
Y-G Y-G
R-W
R-WJ/B No. 3
3B 3A
3A 3B 5
15
15 14
1Driver Side J/B
B1
Brake Fluid Level
Warning Switch Translate ECU
1H
1I 12
8
R-W
1 2
W-B J1 J/C
B B
W-BEngine Room J/B
44
2D2FW-B P3
Parking
Brake
SwitchA20
A20
A20
A20 DI-330
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
486 Author: Date:
2001 AVALON (RM808U)
BRAKE Warning Light Circuit
CIRCUIT DESCRIPTION
The BRAKE warning light lights up when the brake fluid is insufficient, when the parking brake is ap-
plied or when the EBD is defective.
If the translate ECU detects trouble, it makes VSC warning light lights up while prohibiting VSC & TRAC
control. At this time, the ECU records a DTC in memory. Connect terminals Tc and E
1 of the DLC1 or
DLC2 to make BRAKE warning light blink and output the DTC.
WIRING DIAGRAM
DI6OK-02
Page 659 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-277
433 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 ABS motor relay operation.
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 the operation sound of the ABS motor relay individually when operating it with the TOYOTA hand-
held tester.
OK:
The operation sound of the ABS motor relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit in harness and connector between BM of motor relay and
brake actuator and MT of ABS & BA & TRAC & VSC ECU (See page IN-30).
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
Page 662 of 1897
DI-280
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
436 Author: Date:
2001 AVALON (RM808U)
DTC C0278 / 11 ABS Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
C0278 / 11
Detection of any conditions from 1. through 2.:
1. 3 or more solenoids are show faulty in response and
simultaneously solenoid supply voltage is detected
faulty.
2. Solenoid relay will not be switched OFF.
ABS solenoid relay
ABS solenoid relay circuit
DI6O0-03
Page 668 of 1897
DI-286
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
442 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 output value of the deceleration sensor.
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 DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check that the deceleration value of the deceleration sensor displayed on the TOYOTA hand-held tester
is changing when tilting the vehicle.
OK:
Deceleration value must be changing.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
2 Check deceleration sensor (See page DI-252).
NG Replace deceleration sensor.
OK
3 Check for open or short circuit in harness and connector between deceleration
sensor and ABS & BA & TRAC & VSC ECU (See page IN-30).
NG Repair or replace harness and connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 670 of 1897
F07893
DI-288
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
444 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 output value of the yaw rate sensor.
PREPARATION:
(a) Remove the 2 bolts and yaw rate sensor with connector
still connected.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and push the TOYOTA hand-
held tester main switch ON.
(d) Select the DATALIST mode on the TOYOTA hand-held
tester.
CHECK:
Check that the yaw rate value of the yaw rate sensor displayed
on the TOYOTA hand-held tester is changing: Place the yaw
rate sensor vertically to the ground and turn the sensor pivoted
on its center.
OK:
Yaw rate value must be changing.
OK Go to step 3.
NG
2 Check whether continuity exists between terminal YD of yaw rate sensor and ter-
minal YD of ABS & BA & TRAC & VSC ECU.
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 671 of 1897
F09478
1
3
4
1
2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-289
445 Author: Date:
2001 AVALON (RM808U)
3 Check yaw rate sensor.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals IGA (3) and
GYW2 (1), YAW2 (4) and GYW2 (1) of the yaw rate sensor
with connector still connected.
OK:
Terminals 3 and 1
(IGA - GYW2)Approx. 12 V
Terminals 4 and 1
(YAW2 - GYW2)Approx. 2.5 V
NG Replace yaw rate sensor.
OK
4 Check for open and short circuit in harness and connector between yaw rate
sensor and ABS & BA & TRAC & VSC ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 675 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-294
449 Author: Date:
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 output value of the steering angle sensor.
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 DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check that the steering wheel turning angle value of the steering angle sensor displayed on the TOYOTA
hand-held tester is appropriate when turning the steering wheel.
OK:
Steering wheel turning angle value must be appropriate.
OK Go to step 4.
NG
2 Check the installation condition of steering angle sensor and adapter.
NG Repair or replace steering angle sensor (See
page SR-12).
OK
3 Check for open and short circuit in harness and connector between steering
angle sensor, translate ECU and ABS & BA & TRAC & VSC ECU (See page
IN-30).
NG Repair or replace harness or connector.
OK
Page 677 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-295
451 Author: Date:
2001 AVALON (RM808U)
DTCC1237 / 37 Wrong Number of Teeth at 1 of 4 Wheels
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1237 / 37
Detection of any of conditions from 1. through 4.:
1. When the ignition switch is ON, the speed difference
between the rear right and rear left wheels is 5 km/h
(3mph) or more (vehicle speed: 100 km/h (62 mph) or
less).
2. When the ignition switch is ON, the slip difference be-
tween the reference wheel and any other wheels is 6 %
or more (vehicle speed: 100 km/h (62 mph) or more).
3. Continuous ABS control for 60 sec. or more.
4. Interference on 1 or more wheels for 20 sec. with the
brake pedal depressed, or for 5 sec. when the brake
pedal is not depressed.
Tire size
Speed sensor rotor
INSPECTION PROCEDURE
1 Check tire size.
NG Replace tires so that all 4 tires are the same in
size.
OK
2 Check sensor rotor (See page DI-267).
NG Replace speed sensor rotor.
OK
3 Check speed sensor (See page DI-267).
NG Replace speed sensor.
OK
DI6O5-01
