2001 TOYOTA AVALON Service Repair Manual

F00042
1 34
6 Open
(+)(-)1 2 3
4
4 5 6
1 2
3
2 5 6
5 Continuity
ContinuityContinuity
Open
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-283
439 Author
: Date
:
2001 AVALON (RM808U)
2 Check ABS solenoid relay.
CHECK:
Check continuity between following terminals of ABS solenoid
relay.
OK:
Terminals 4 and 6Continuity
(Reference value 80 W)
Terminals 2 and 3Continuity
Terminals 1 and 3Open
CHECK:
(a) Apply battery positive voltage between terminals 4 and 6.
(b) Check continuity between following terminals of ABS so-
lenoid relay.
OK:
Terminals 2 and 3Open
Terminals 1 and 3Continuity
NG Replace ABS solenoid relay.
OK

F07892
ECU ABS
Solenoid
Relay
Brake
Actuator3 Engine Room R/B No. 8
5 25
49 52
6 2650 533 4
54
55
DI-284
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
440 Author
: Date
:
2001 AVALON (RM808U)
3 Check continuity between terminal 3 of engine room R/B No. 8 (for ABS solenoid
relay) and each solenoid terminal of ABS & BA & TRAC & VSC ECU.
PREPARATION:
Disconnect the connector from the ABS & BA & TRAC & VSC
ECU.
CHECK:
Check continuity between terminal 3 of engine room R/B No. 8
and each terminal, 3, 4, 5, 6, 25, 26, 49, 50, 52, 53, 54 and 55
of ECU harness side connector.
OK:
Continuity
HINT:
Resistance of each solenoid coil.
SFLH (5), SRRH (6), SFRH (26), SMC1 (49), SMC2 (50), SRLH
(53): 8 - 9.1 W
SFLR (3), SRRR (4), SRLR (25), SRC2 (52), SRC1 (54), SFRR
(55): 4.0 - 4.6 W
NG Repair or replace harness or brake actuator.
OK
4 Check for open and short circuit in harness and connector between ABS sole-
noid relay and ABS & BA & TRAC & VSC ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection. If the connections are normal, the ECU may be defective.

F09813
Deceleration Sensor
IGA
GNDA
GL1(Shielded)
34
18YGNA
GL1 YIGA
A2078 13
AR
A20
A20ABS & BA & TRAC
& VSC ECU
(Shielded)
W
G ID1
14
ID1
16
ID1
15
ID1 BRBR-W
BR
BR3
Y1
6
Y1
5
Y1
IG
J4
J/CAR
W
G
BR-W
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-285
441 Author
: Date
:
2001 AVALON (RM808U)
DTC C0365 / 43 Deceleration Sensor Circuit
CIRCUIT DESCRIPTION
Deceleration sensor is combined with yaw rate sensor.
DTC No.DTC Detecting ConditionTrouble Area
C0365 / 43
Detection of any of conditions from 1. through 4.:
1. The sensor signal is out of range, less than 0.25 V or
more than 4.75 V.
2. Deceleration difference between sensor signal and refer-
ence value is large.
3. Offset value of sensor signal is higher than the standard
value.
4. sensor signal change rapidly higher than the value at the
normal condition.

Deceleration sensor

Deceleration sensor circuit
WIRING DIAGRAM
DI6O1-03

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.

F09813
Yaw Rate Sensor
YD
GYW2
YAW 2(Shielded)
75
77GYAW
YAWYD
A2076 1
ABR
A20
A20ABS & BA & TRAC
& VSC ECU
(Shielded)
Y
L BR
Y
LID1
2
ID1
12
ID1
15
ID1 BR
BR-W
BR
BR2
Y1
1
Y1
4
Y1
IGJ4
J/C
ABR-W
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-287
443 Author
: Date
:
2001 AVALON (RM808U)
DTC C0371 / 55 Yaw Rate Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C0371 / 55
Detection of any of conditions from 1. through 4.:
1. The voltage of sensor signal is out of range.
2. The offset value of sensor signal is outside the plausible
range.
3. Sensor signal change rapidly under normal driving.
4. Sensor is more or worse sensitivity than reference yaw
rate during cornering.

Yaw rate sensor

Yaw rate sensor circuit
WIRING DIAGRAM
DI6O2-03

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.

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.

F09814
J/B No. 3
15
3B 15
3AABS & BA & TRAC
& VSC ECU
40
A20
LBL Driver Side J/B
Engine Room J/B
M6
Multi
DisplayIC1 Translate
ECU
L-B 25
T5 11
T5
16
T5R-W
7
R-W
3
4
R-B LVL2LBL
BRL R-W
R-W
Level
Warning Switch12
1I 8
1H
R-W
12
BB J1
J/B
W-B
EDDriver Side J/B
GAUGE No. 1
W-B
W-B
J/B No. 4
10
1DR-B4
4D13
4F 4
2D4
2F
BRAKE
DI-290
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
446 Author
: Date
:
2001 AVALON (RM808U)
DTC C1202 / 44 Brake Fluid Level Warning Switch Cir-
cuit
CIRCUIT DESCRIPTION
The brake fluid level warning switch sends appropriate signals to the ECU when the brake fluid level is low-
ered.
HINT:
Depressing the parking brake pedal turns on the brake warning light, but this DTC No. C1202/44 is not out-
put.
DTC No.DTC Detecting ConditionTrouble Area
C1202 / 44
Fluid level in the brake master cylinder reservoir tank re-
mains low for 60 sec. or more. This means brake fluid
warning switch likes on.
Brake fluid level

Brake fluid level warning switch

Brake fluid level warning switch circuit
WIRING DIAGRAM
DI6O3-01