2001 TOYOTA AVALON Service Repair Manual

DI6N7-01
F07879
F02201
E1Tc
DLC1
F00103
Normal Code
0.25 sec.
0.25 sec. 0.5 sec.
ON
OFF
ON
OFF0.5 sec. 0.5 sec.
Code 11 and 21
4 sec.1.5 sec.
2.5 sec.
Code 11 Code 21
DI-212- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
368 Author
: Date
:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Release the parking brake pedal.
(b) Check the indicator.
When the ignition switch is turned ON, check that the ABS
warning light and BRAKE warning light goes on for
approx. 3 seconds.
HINT:

When the parking brake is applied or the level of the brake
fluid is low, the BRAKE warning light is lit.

If the indicator check result is not normal, proceed to trou-
bleshooting for the ABS warning light circuit or BRAKE
warning light circuit (See page DI-243, DI-240).
(c) Check the DTC.
(1) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON and read the DTC from
the ABS warning light on the combination meter.
HINT:

If no codes appears, inspect the diagnostic circuit or ABS
warning light circuit (See page DI-245 or DI-243).

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(3) Codes are explained in the code table on page
DI-215.
(4) After completing the check, disconnect terminals Tc
and E
1, and turn off the display.
If 2 or more malfunction codes are identified at the
same time, the lowest numbered DTC will be dis-
played 1st.

BR3890
F02201
DLC1
Ts E
1
Tc
BR3904
0.13 sec. 0.12 sec.
ON
OFF
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-213
369 Author
: Date
:
2001 AVALON (RM808U)
(d) Clear the DTC.
(1) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 times or more within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC1.
SST 09843-18020
HINT:
Cancellation cannot be done by removing the battery cable or
ECU-IG fuse.
2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
(a) Check the sensor signal.
(1) Using SST, connect terminals Ts and E
1 of DLC1.
SST 09843-18020
(2) Start the engine.
(3) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI-243).
(4) Drive vehicle straight forward.
(5) Drive vehicle at a speed faster than 45 km/h (28
mph) for several seconds.
HINT:
If the brake is applied during the check, the check routine must
be started again.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunction codes are identified at the same
time, the lowest numbered code will be displayed 1st.

BR3893
Malfunction Code (Example Code 72, 76)
7
26 7
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.
4 sec.
Repeat DI-214
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
370 Author
: Date
:
2001 AVALON (RM808U)
(9) After completing the check, disconnect the SST
from terminals Tc and E
1 of DLC1, and turn the igni-
tion switch OFF.
SST 09843-18020
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Right front speed sensor rotor
72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Left front speed sensor rotor
73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Right rear speed sensor rotor
74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Left rear speed sensor rotor
75Abnormal change in output voltage of right front speed sen-
sor
Right front speed sensor rotor
76Abnormal change in output voltage of left front speed sen-
sor
Left front speed sensor rotor
77Abnormal change in output voltage of right rear speed sen-
sor
Right rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor

DI6NB-01
DI-218- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)
374 Author
: Date
:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during DTC check but a problem still occurs, check the circuits corresponding
to each problem symptom in the order given in the table below and proceed to the relevant troubleshooting
page.
NOTICE:
When replacing ABS ECU, sensor or etc., turn the IG switch OFF.
SymptomSuspect AreaSee page
ABS does not operate
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS ECU.
5. Check the DTC reconfirming that the normal code is
output.
6. Power source circuit
7. Speed sensor circuit
8. Check the hydraulic circuit for leakage.
DI-212
DI-231
DI-225
DI-249
ABS does not operate intermittently
Only when 1. - 4. are all normal and the problem is still
occurring, replace the ABS ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the hydraulic circuit for leakage.
DI-212
DI-225
DI-234
DI-249
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI-243
BRAKE warning light abnormal1. BRAKE warning light circuit
2. ABS ECUDI-240
DTC check cannot be done
Only when 1. and 2. are all normal and the problem is still
occurring, replace the ABS ECU.
1. ABS warning light circuit
2. Tc terminal circuit
DI-243
DI-245
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS ECUDI-247

DI6NA-01
F10161
A7
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM WITH ELECTRONIC
BRAKE FORCE DISTRIBUTION (EBD)DI-217
373 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
RR+ (A7 - 2) - RR- (A7 - 1)G e YIG switch ON
Slowly turn right rear wheelAC generation
FR+ (A7 - 5) - FR- (A7 - 4)B-W e LIG switch ON
Slowly turn right front wheelAC generation
FL+ (A7 - 7) - FL- (A7 - 6)BR e B-RIG switch ON
Slowly turn left front wheelAC generation
RL+ (A7 - 9) - RL- (A7 - 8)LG e VIG switch ON
Slowly turn left rear wheelAC generation
Ts (A7 - 11) - GND (A7 - 16,
19)LG-B e W-BIG switch ON5.7 - 8.1
Tc (A7 - 12) - GND (A7 - 16,
19)LG-R e W-BIG switch ON5.7 - 8.1
STP (A7 - 14) - GND (A7 - 16,GWWBStop light switch pushed inBelow 1.5STP (A7 14) GND (A7 16,
19)G-W e W-BStop light switch released5 - 14
IG1(A7 - 15) - GND (A7 - 16,
19)Y-R e W-BIG switch ON10 - 14
+B (A7 - 17) - GND (A7 - 16,
19)L e W-BAlways10 - 14
BAT (A7 - 18) - GND (A7 - 16,
19)L e W-BAlways10 - 14
WA (A7 - 20) - GND (A7 - 16,BWBIG switch ON, ABS warning light ONBelow 2.6WA (A7 20) GND (A7 16,
19)B e W-BIG switch ON, ABS warning light OFF10 - 14
EBDW (A7 - 21) - GND (A7 -RYWBIG switch ON, BRAKE warning light ONBelow 2.6EBDW (A7 21) GND (A7
16, 19)R-Y e W-BIG switch ON, BRAKE warning light OFF10 - 14
PN (A7 - 23) - GND (A7 - 16,LWWBIG switch ON, Shift lever is Por N range10 - 14PN (A7 23) GND (A7 16,
19)L-W e W-BIG switch ON, Shift lever is not Por N rangeBelow 2.0

F09823
ABS & BA &
TRAC & VSC ECU
WA A2081
47 1
B
W-B
B
BJ4
J/C
W-B W-B
IG Battery FL MAINA21
Active
Light
Relay
F10F8 F61 1
1ALT
W W
W-B
B-L
2G
2H 11
5512 AM1
B
W-LIF17 W-L 22
Y-R
IG1 AM1 4
Ignition Switch W-R 1B 1C1G1B1D
4
3 4 3 1
1
213 10 GAUGE No. 1
ECU-IG
No. 2
Y-R3C
3D 2
11 R-B
R-B 4D
4FM6M6
4
Multi
Display 13 45 R-LR-L
4A4B
4H15
15 15
R-L 14
E1
ABS D2
DLC2
ABS
J/B No. 4
J/B No. 3 Driver Side J/B
Engine Room J/B
Engine Room R/B No. 5J/B No. 4
FL Block IG1
Relay
B
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-325
481 Author
: Date
:
2001 AVALON (RM808U)
ABS Warning Light Circuit
WIRING DIAGRAM
DI6OI-03

DI-326
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
482 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
Troubleshoot in accordance with the chart below for each trouble symptom.
ABS warning light does not light up*
ABS warning light remains onGo to step 2
*: Start the inspection from step 1 in case of using a TOYOTA hand-held tester and start from step 2 in case
of not using the TOYOTA hand-held tester.
1 Check operation of the ABS 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 ABS warning light can be shown on the combination meter on the TOYOTA
hand-held tester.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
2 Check ABS warning light.
See combination meter troubleshooting on page BE-2.
NG Replace bulb or repair combination meter as-
sembly.
OK
3 Check active lamp relay.
NG Replace active lamp relay.
OK
Repair or replace and check for open or short circuit in harness and connector.