TOYOTA AVALON 2001 Service Repair Manual

F07895
ON
(+) (-) 128
29
F07896
(+)
(-) LOCK
2928
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-299
455 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminals IG1 (1) and GND (28, 29) of ABS & BA & TRAC
& VSC ECU.
PREPARATION:
Disconnect the connector from the ABS & BA & TRAC & VSC
ECU.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals 1 and 28, 29 of
ABS & BA & TRAC & VSC ECU harness side connector.
OK:
Voltage: 10 - 14 V
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
4 Check continuity between terminals GND (28, 29) of ABS & BA & TRAC & VSC
ECU and body ground.
CHECK:
Measure the resistance between terminal 28, 29 of ABS & BA
& TRAC & VSC ECU 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 ABS & BA & TRAC & VSC ECU and
ECU-IG fuse (See page IN-30).

F09812
M2 Master Cylinder
Pressure SensorABS & BA &
TRAC & VSC ECU
VCM
E2 PMC
123
VCM
PMC
E2IF3
A20 A20A2065
66
67 IF3 IF3
29 8
P-L
R-L
BR-YP-L
R-L
BR-Y DI-300
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
456 Author
: Date
:
2001 AVALON (RM808U)
DTCC1246 / 53Master Cylinder Pressure Sensor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1246 / 53
When any of the following 1. through 3. is detected:
1. The voltage of sensor signal is out of range (less than
0.25 V, more than 4.75 V).
2. The sensor supply voltage is out of range (above 5.6 V,
below 4.4 V).
3. The sensor signal offset value is out of range.

Master cylinder pressure sensor

Master cylinder pressure sensor circuit
WIRING DIAGRAM
DI6O7-02

F07902
PMCE2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-301
457 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 master cylinder pressure 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 brake fluid pressure value of the master cylinder pressure sensor displayed on the TOYOTA
hand-held tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
Install LSPV gauge to the front caliper bleeder plug portion, and
bleed the air from LSPV gauge.
SST 09709-29018
CHECK:
Start the engine and depress the brake pedal, then check the
relation between the fluid pressure and voltage of PMC and E2
terminals of the master cylinder pressure sensor with connector
still connected.
OK:
Front brake caliper fluid pressureVoltage
0 kPa (0 Kgf/cm2, 0 psi)0.44 - 0.76 V
5,883 kPa (60 kgf/cm2, 853 psi)1.34 - 1.66 V
11,768 kPa (120 kgf/cm2, 1,706 psi)2.24 - 2.56 V
HINT:
Voltage between terminals VCM and E2: 4.7 - 5.3 V
NG Replace master cylinder pressure sensor.
OK

DI-302
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
458 Author
: Date
:
2001 AVALON (RM808U)
3 Check for open and short circuit in harness and connector between master cyl-
inder pressure sensor and ABS & BA & TRAC & VSC ECU (See page IN-30).
NG Repair or replace harness or connector.
OK
4 Check whether or not the ECU terminal STP input voltage is changed when the
stop light switch is turned on and off.
NO Check the stop light switch circuit (See page
BE-36).
YES
Check and replace ABS & BA & TRAC & VSC
ECU.

F09817
ABS & BA & TRAC
& VSC ECU
48
A20
STP
ALTJ/B No. 3
FL Block
FL MAIN
Battery Driver Side J/B
S4
Stop Light SwitchG-W
STOP
L5
Light Failure SensorR8
Rear Combination
Light RH
G-R
J12
J/C J/B No. 4
16
4D 16
4F 3
3F 3
3C 5
1B 3
1D
4 1E
5IK1
7 12R
Driver Side J/B
11
1D 1
1G W
1
F101
F6B2
G-R W-B BB
B3
6
C Stop R7
Rear Combination
Light LH
3
6 Stop
1 R-W
W-B H11
High Mounted
Stop Light
21
C
C
W-B
BM G-R W-B G-W G-W
G-W
G-W
G-W
J12
J/C
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-303
459 Author
: Date
:
2001 AVALON (RM808U)
DTC C1249 / 58 Stop Light Switch Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1249 / 58
After the ignition switch is turned ON, the condition that the
STP terminal voltage of ECU is 55 % to 75 % of supplied
voltage, continues for 1 sec. or more.
Stop light switch

Stop light switch circuit
WIRING DIAGRAM
DI6O8-03

F07897
48
DI-304
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
460 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 (48) of ABS & BA & TRAC & VSC ECU and
body ground.
PREPARATION:
Disconnect the connector from the ABS & BA & TRAC & VSC
ECU.
CHECK:
Measure the voltage between terminal 48 of ABS & BA & TRAC
& VSC ECU harness side connector and body ground when the
brake pedal is depressed.
OK:
Voltage: 7.5 - 14 V
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
3 Check for open circuit in harness and connector between terminal STP of ABS &
BA & TRAC & VSC ECU 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-266).

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-305
461 Author
: Date
:
2001 AVALON (RM808U)
DTCC1300 / 62ABS & BA & TRAC & VSC ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1300 / 62ABS & BA & TRAC & VSC ECU internal malfunction is
detected.
ABS & BA & TRAC & VSC ECU
INSPECTION PROCEDURE
1 Check the DTC for the ABS and VSC (See page DI-252).
*1 Repair ABS and VSC control system according
to the code output.
*2
Check if ECU is connected to malfunction in-
dicator light.
*1: Output NG code
*2: Malfunction indicator light remains ON
DI6O9-01

F09816
ABS & BA & TRAC
& VSC ECU
Engine RoomR/B No. 3
J/B No. 3
FL Block
FL MAIN7
A20
MR
2
A20 R+
27
A20
MT GR-L
ABS Motor Relay
W
B-L
Battery6
IE1
W-B
ABS GR-L
6
3AGR-R GR-R GR-R
3
3 3
31
23 4
Engine Room J/B 21
IF3
ALTABS No. 419
3H
ABS & BA & TRAC& VSC Actuator
6
A510
A5 L
L
OOEE
IF3
3 Engine Room R/B No. 5
12
215
5 5
5
B1
F61
F81
2G1
2H B DI-306
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
462 Author
: Date
:
2001 AVALON (RM808U)
DTCC1350 / 51Brake Actuator Pump Motor Failure
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1350 / 51
When any of the following 1. through 3. is detected.
1. No motor voltage supply after actuator of the motor
relay.
2. A high level of motor voltage with no actuator of the mo-
tor relay.
3. The pump motor voltage is high level for a certain time
after the motor relay has elapsed.

Brake actuator pump motor

Brake actuator pump motor circuit
WIRING DIAGRAM
DI6OA-03

F07898
1314
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-307
463 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of brake actuator pump motor.
PREPARATION:
Disconnect the connector from the brake actuator.
CHECK:
Connect positive
lead to terminal 14 and negative  lead to
terminal 13 of the brake actuator connector, check that the
pump motor is operated.
OK:
The running sound of the pump motor should be
heard.
OK Check for open circuit in harness and connec-
tor between ABS motor relay, brake actuator
and ECU (See page IN-30).
NG
Replace brake actuator.

F09810
ABS & BA &
TRAC & VSC ECU
ML- ML+
A622
24
A20 A20
IE1 Precharge Pump
V
VW-R
W-R
IE18
9 A61
6
ML- ML+
ML- ML+ Brake Actuator
1 2 DI-308
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
464 Author
: Date
:
2001 AVALON (RM808U)
DTC C1351 / 52Precharge Pump Motor Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
C1351 / 52
When any of the following 1. or 2. is detected:
1. After the ignition switch is turned ON, an open or short
circuit continues for 0.06 sec. or more.
2. The precharge pump motor voltage is out of range when
precharge pump if off.

Precharge pump motor

Precharge pump motor circuit
WIRING DIAGRAM
DI6OB-02