2001 TOYOTA AVALON Service Repair Manual

DI-230- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
386 Author
: Date
:
2001 AVALON (RM808U)
DTC 37 Speed Sensor Rotor Faulty
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
37
When any of the following 1. through 3. is detected:
1. Occurrence of wheel speed difference between the front
and rear wheels of either left or right side of the vehicle
and the front left and right wheels. (Detection of mini tire
size, spinning wheel or decelerating wheel.)
2. Continuous ABS control for 60 sec. or more.
3. 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.

Speed sensor

Sensor rotor
INSPECTION PROCEDURE
1 Check sensor rotor (See page DI-225).
NG Replace sensor rotor.
OK
2 Check speed sensor (See page DI-225).
NG Replace speed sensor.
OK
3 Check for open or short circuit in harness and connector between speed sensor
and ABS ECU (See page IN-30).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI6NG-01

F09798
Battery W-B
W-BGND1ABS Actuator
and ECU
A715
EE EDY-R
IG1
W-R
ALT
AM1 Driver Side J/B
IG1 RelayECU-IG
No. 2
A719
GND2
A716 1H2
1C4 2
3 1
4 1G1
1B3
W42Ignition Switch
W-L
7IF1
W-L
5
52
1
BEngine Room R/B No. 5
FL Block Engine Room J/B
2H1
2G1
2F4
2F10 B-L
W-B F61
F81
F101
B
FL MAIN IGIG1 AM1
W-B
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-231
387 Author
: Date
:
2001 AVALON (RM808U)
DTC 41 Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
At a vehicle speed of about 6 km/h (4 mph), low battery
voltage is less than 9.4 V during non-operation of ABS
control or less than 8.8 V during operation of ABS control,
and high battery voltage is more than 17.4 V.
Battery

Charging system

Power source circuit
WIRING DIAGRAM
DI6NH-01

F07886
Driver Side J/B
ECU-IG
No. 2
DI-232- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
388 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check ECU-IG No. 2 fuse.
PREPARATION:
Remove ECU-IG No. 2 fuse from driver side J/B.
CHECK:
Check continuity of ECU-IG No. 2 fuse.
OK:
Continuity
NG Check for short circuit in all the harness and
components connected to ECU-IG No. 2 fuse
(See attached wiring diagram).
OK
2 Check battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair the charging system (See
page CH-1).
OK

F00067
(+)(-) ON
A7
151916
F00068
(+) (-) LOCK
A71916
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-233
389 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminals IG1 (A7 - 15) and GND (A7 - 16, 19) of the
brake actuator connector.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals A7 - 15 and A7
- 16, 19 of the brake actuator harness side connector.
OK:
Voltage: 10 - 14 V
OK Check and replace ABS ECU.
NG
4 Check continuity between terminals GND (A7 - 16, 19) of brake actuator connec-
tor and body ground.
CHECK:
Measure the resistance between terminal A7 - 16, 19 of brake
actuator harness side connector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK
Check for open circuit in harness and connector between terminal IG1 of brake actuator
and ECU-IG fuse (See page IN-30).

F09800
ABS Actuator
and ECU
A714
STP Driver Side J/B
BatteryJ/B No. 4
S4
Stop Light SwitchR7
Rear Combination
Light LH
G-W
14
IE1 G-W
G-W
J/B No. 3
16
4D 16
4F G-W3
3F 3
3C 5
1B 3
1D
4
1E
12R
11
1D STOP
FL Block
FL MAIN
L5
Light Failure
SensorStop
J12
J/C 1
1G W
1
F101
F6B5
IK1
7
Stop
36
G-R
B BBW-B
C
C
W-B
R8
Rear Combination
Light RH
36
G-R
G-R 2
1R-WH11
High Mounted
Stop Light
21
W-BC
C
W-B
BM ALTG-W G-W
G-W Driver Side J/B
J12
J/C DI-234
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
390 Author
: Date
:
2001 AVALON (RM808U)
DTC 58 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
58
Stop light switch circuit is open, and stop light switch volt-
age is in the level between 55 % and 75 % of the battery
voltage.
Stop light switch

Stop light switch circuit
WIRING DIAGRAM
DI6NI-02

F00069
(+) (-)
14A7
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-235
391 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that the stop light lights up when the brake pedal is depressed and turns off when the brake pedal
is released.
NG Repair stop light circuit (See page BE-36).
OK
2 Check voltage between terminal STP (A7 - 14) of brake actuator and body
ground.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
Measure the voltage between terminal A7 - 14 of brake actua-
tor harness side connector and body ground when the brake
pedal is depressed.
OK:
Voltage: 8 - 14 V
OK Check and replace ABS ECU.
NG
3 Check for open circuit in harness and connector between terminal STP of brake
actuator and stop light switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
DI-218).

DI-236- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
392 Author
: Date
:
2001 AVALON (RM808U)
DTC 62 ABS ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
62ABS ECU continuously detects the proper operation of
ABS.ABS ECU
INSPECTION PROCEDURE
1 Is DTC output?
Check the DTC on page DI-212.
YES Repair circuit indicated by the code output.
NO
2 Is normal code displayed?
YES Check for short circuit in harness and connec-
tor between DLC1 or DLC2 and ABS ECU (See
page IN-30).
NO
3 Is ABS warning light off?
YES Check open and short circuit of the harness and
connector in the Tc circuit between ABS ECU
and DLC2 or DLC1.
NO
DI6NJ-01

F00067
ON
(+) (-)
15
19
16 A7
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-237
393 Author
: Date
:
2001 AVALON (RM808U)
4 Check voltage between terminals IG1 (A7 - 15) and GND (A7 - 16, 19) of brake
actuator connector.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals A7 - 15 and A7
- 16, 19 of brake actuator harness side connector.
OK:
Voltage: 10 - 14 V
NG Check for open or short circuit in harness and
connector between ECU-IG fuse and IG1 of
brake actuator (See page IN-30).
OK
5 Check connection of brake actuator connector.
CHECK:
Check the connection of the brake actuator connector and check the ABS warning light goes off.
OK Repair or replace harness or connector.
NG
Check and replace ABS ECU.