2001 TOYOTA AVALON Service Repair Manual

F09805
ABS Actuator and ECU
DLC2LG-R
LG-RLG-RTc 12
A7 7
1H 3B 4
Tc 4
EB5
1I 4
133A 3G
22 II2
W-BLG-R
DLC1 LG-R
LG-R6
4H 6
4A
Tc
E13J/B No. 4
Driver Side J/B J/B No. 3
11
F10163
DLC2
Tc E1
DLC1
Tc ON
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-245
401 Author
: Date
:
2001 AVALON (RM808U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting between terminals Tc and E1 of the DLC1 causes the ECU to display the DTC by flashing the
ABS warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Tc and E
1 of
DLC1 or terminal Tc of DLC2 and body ground.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Tc
and E
1 are connected, the ECU may be defec-
tive.
NG
DI6NN-01

DI-246- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
402 Author
: Date
:
2001 AVALON (RM808U)
2 Check for open and short circuit in harness and connector between ABS ECU
and DLC2 or DLC1, DLC2 or DLC1 and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.

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

AB0119S08096
F00446
Ts
DLC1Ts
DLC1Ts
DLC1Ts
DLC1Ts
DLC1Ts
DLC1 E
1
ON
DI-248- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
404 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Ts and E
1 of
DLC1.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, the ECU may be defec-
tive.
NG
2 Check for open and short circuit in harness and connector between ABS ECU
and DLC1, DLC1 and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS ECU.

DI6N6-01
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)
Remains ONDoes not Light Up
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
ABS does not operate.
ABS Warning Light
AbnormalABS does not operate intermittently.
ABS Check Sheet
BRAKE Warning
Light AbnormalRemains ONDoes not Light Up
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-21 1
367 Author
: Date
:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK

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 circuit
ABS solenoid relay

ABS solenoid relay circuit
13
(DI-221)Open or short circuit in ABS pump motor circuit
ABS motor relay

ABS motor relay circuit
21
(DI-223)Open or short circuit in brake actuator
Brake actuator

SFRR or SFRH circuit
22
(DI-223)Open or short circuit in brake actuator
Brake actuator

SFLR or SFLH circuit
23
(DI-223)Open or short circuit in brake actuator
Brake actuator

SRRR or SRRH circuit
24
(DI-223)Open or short circuit in brake actuator
Brake actuator

SRLR or SRLH circuit
31*
(DI-225)Right front wheel speed sensor signal malfunction
32*
(DI-225)Left front wheel speed sensor signal malfunction
Right 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 circuit
Right 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
wheels
Speed sensor

Sensor rotor
38*
(DI-225)Open circuit in right rear wheel speed sensor circuit
Right 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 circuit
Stop light switch

Stop light switch circuit
62
(DI-236)Malfunction in ABS ECUABS ECU
Always ON
(DI-238)Malfunction in ABS ECU
Charging 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.

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.

DI6N9-01
F07882
Brake Actuator
(w/ ECU, Relay)Front Speed Sensor DLC1
DLC2
Sensor RotorRear Speed Sensor
ABS Warning Light
BRAKE Warning LightSensor Rotor
Front Speed Sensor
Rear Speed Sensor
Stop Light Switch
Sensor RotorActive
Lamp Relay
DI-216- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
372 Author
: Date
:
2001 AVALON (RM808U)
PARTS LOCATION