Page 614 of 1897
R14205
1
2
R14213
1
2
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-227
383 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front:
PREPARATION:
(a) Remove the front fender liner.
(b) Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 - 2.5 kW (1.6 ± 0.2 kW at 20 °C)
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
Rear:
PREPARATION:
(a) Remove the seat cushion and seatback.
(b) Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 1.2 - 2.3 kW (1.6 ± 0.1 kW at 20 °C)
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MW or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-212).
OK
Page 615 of 1897
BR3795
OK NG OK NG
OK NGOK NG
W04200
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
DI-228- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
384 Author: Date:
2001 AVALON (RM808U)
2 Check for open and short circuit in harness and connector between each speed
sensor and ABS ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
3 Check speed sensor installation.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt shall be tightened properly and
there is no clearance is allowed between the sensor
and front steering knuckle or rear axle carrier.
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-212).
OK
4 Check speed sensor and sensor rotor serrations.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Disconnect the connector from the brake actuator.
(b) Connect the oscilloscope to the terminals FR+, FL+, RR+
or RL+ and GND of the ABS ECU harness side connector.
CHECK:
Drive the vehicle at about 30 km/h (19 mph), and check the sig-
nal waveform.
OK Check and replace ABS ECU.
NG
Page 616 of 1897
R00948
R00947
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-229
385 Author: Date:
2001 AVALON (RM808U)
5 Check sensor rotor and sensor tip.
Front:
PREPARATION:
Remove the front drive shaft (See page SA-16).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the front speed sensor (See page BR-60).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear:
PREPARATION:
Remove the axle hub (See page SA-45).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
PREPARATION:
Remove the rear speed sensor (See page BR-63).
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
NG Replace sensor rotor or speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-212).
OK
Check and replace ABS ECU.
Page 617 of 1897
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
Page 621 of 1897
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
Page 627 of 1897
F09804
ABS Actuator and ECU
LG-B LG-B
Ts 11
A7 13
IE1 3
4BLG-B LG-B DLC1
Ts
W-BJ/B No. 4
E112
4A 11
II2
16
3
EB
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-247
403 Author: Date:
2001 AVALON (RM808U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalily in the speed sensor signal which cannot be detected by the
DTC check.
Connecting terminals Ts and E
1 of the DLC1 starts the check.
WIRING DIAGRAM
DI6NO-01
Page 630 of 1897
DI6N8-01
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-215
371 Author: Date:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18020, connect the terminals Tc and E1.
If any abnormality is found when inspecting parts, inspect the ECU.
If a malfunction code is displayed during the DTC check, check the circuit listed under the code. For
details of each code, refer to the page under respective ºDTC No.º in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI-219)Open or short circuit in ABS solenoid relay circuitABS solenoid relay
ABS solenoid relay circuit
13
(DI-221)Open or short circuit in ABS pump motor circuitABS motor relay
ABS motor relay circuit
21
(DI-223)Open or short circuit in brake actuatorBrake actuator
SFRR or SFRH circuit
22
(DI-223)Open or short circuit in brake actuatorBrake actuator
SFLR or SFLH circuit
23
(DI-223)Open or short circuit in brake actuatorBrake actuator
SRRR or SRRH circuit
24
(DI-223)Open or short circuit in brake actuatorBrake actuator
SRLR or SRLH circuit
31*
(DI-225)Right front wheel speed sensor signal malfunction
32*
(DI-225)Left front wheel speed sensor signal malfunctionRight front, left front, right rear and left rear speed sensor
Eh d i it33*
(DI-225)Right rear wheel speed sensor signal malfunction
Each speed sensor circuit
Sensor installation
34*
(DI-225)Left rear wheel speed sensor signal malfunction
35*
(DI-225)Open circuit in right front wheel speed sensor circuitRight front, left front speed sensor
36*
(DI-225)Open circuit in left front wheel speed sensor circuit
Right front, left front s eed sensor
Each speed sensor circuit
37
(DI-230)Speed sensor rotor has wrong number of teeth on one of the 4
wheelsSpeed sensor
Sensor rotor
38*
(DI-225)Open circuit in right rear wheel speed sensor circuitRight rear, left rear speed sensor
39*
(DI-225)Open circuit in left rear wheel speed sensor circuit
Right rear, left rear s eed sensor
Each speed sensor circuit
41
(DI-231)Low and high battery positive voltage
Battery
Charging system
Power source circuit
58
(DI-234)Open circuit in stop light switch circuitStop light switch
Stop light switch circuit
62
(DI-236)Malfunction in ABS ECUABS ECU
Always ON
(DI-238)Malfunction in ABS ECUCharging system
ABS warning light circuit
*: As the DTC cannot only be erased by replacing parts, do either of the following operations.
(1) Clear DTC (See page DI-212).
(2) At a vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
Page 631 of 1897
DI6N5-01
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI-21 1
Check and Clear DTC (Precheck)
P. DI-212Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN-20
Symptom
does not occur
Symptom
occurs
DTC Check
Sensor CheckCircuit Inspection
P. DI-219 - DI-247
DTC Chart
P. DI-215 Malfunction codeProblem Symptoms Table
P. DI-218
Check for Fluid Leakage
P. DI-249
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
P. DI-212
Fail safe function:
When a failure occurs in the ABS system, the ABS warning light is lit and the ABS operation is prohibited. In addition
to this, when the failure which disables the EBD operation occurs, the brake warning light is lit as well and EBD
operation is prohibited. DI-210
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
366 Author: Date:
2001 AVALON (RM808U)
ANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC BRAKE
FORCE DISTRIBUTION (EBD)
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following pages.
