Page 647 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-331
487 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check parking brake switch circuit (See page BE-53).
NG Repair or replace parking brake switch circuit.
OK
2 Check brake fluid level warning switch circuit (See page BE-53).
NG Repair or replace brake fluid level warning
switch circuit.
OK
3 Is DTC output for ABS ?
YES Repair circuit indicated by the output code.
No
4 Check BRAKE warning light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
Page 672 of 1897
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
Page 673 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-291
447 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check brake fluid level.
CHECK:
Check the amount of fluid in the brake reservoir.
NG Check for fluid leakage, repair brake line and
add fluid.
OK
2 Check brake fluid level warning switch (See page BE-53).
NG Replace brake fluid level warning switch.
OK
3 Check for open circuit in all the harness and components connected to brake
fluid level warning light (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
Page 683 of 1897
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
Page 699 of 1897
F07889
DI-346
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
502 Author: Date:
2001 AVALON (RM808U)
Check for Fluid Leakage
Check for fluid leakage from actuator or hydraulic lines.
DI6OQ-01
Page 701 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-317
473 Author: Date:
2001 AVALON (RM808U)
DTC Normal Code Malfunction in ECM
CIRCUIT DESCRIPTION
If any trouble occurs in the ECM control system, the ECU prohibits ABS & VSC control.
DTC No.DTC Detecting ConditionTrouble Area
Normal Code
Conditions 1., 2,. 3, or 4,continue for 5 sec. or more:
1. Engine malfunction signal is sent from ECM.
2. Shift malfunction signal is sent from ECM
3. The shift position is other than P and N range input volt-
age is 8 V or more.
4. The shift position is PN or rev and D range input voltage
is 8 V or more.ECM circuit
ECM
Brake fluid level
Brake fluid level warning switch circuit
Steering angle sensor
ABS & BA & TRAC & VSC ECU
INSPECTION PROCEDURE
1 Is DTC out put for ECM?
Check DTC on page DI-3.
YES Repair engine control system according to the
output code.
NO
2 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 and replace translate ECU.
*1: Output NG code except for DTC of VSC system C1301/42
*2: Output NG code DTC of VSC system C1301/42 only
DI6OF-03
Page 720 of 1897
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-259
415 Author: Date:
2001 AVALON (RM808U)C1300 / 62
(DI-305)
Malfunction in ABS & BA & TRAC & VSC ECUABS & BA & TRAC & VSC ECU
Always ON
(DI-319)Malfunction in ABS & BA & TRAC & VSC ECU
Open circuit in ABS warning light circuitCharging system
ABS warning light circuit
*: As the DTC cannot be erased only by replacing parts, do either of the following operations.
(1) Clear DTC (See page DI-252).
(2) At a vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.
DTC chart of VSC system:
DTC No.
(See Page)Detection ItemTrouble Area
C1225 / 25
(DI-273)Open or short circuit in brake actuator solenoid circuit (SMC1
circuit)Brake actuator
SMC1 circuit
C1226 / 26
(DI-273)Open or short circuit in brake actuator solenoid circuit (SMC2
circuit)Brake actuator
SMC2 circuit
C1227 / 27
(DI-273)Open or short circuit in brake actuator solenoid circuit (SRC1
circuit)Brake actuator
SRC1 circuit
C1228 / 28
(DI-273)Open or short circuit in brake actuator solenoid circuit (SRC2
circuit)Brake actuator
SRC2 circuit
C1301 / 42*Malfunction in communication with the translate ECU
Brake fluid level warning switch circuit
Translate ECU
Translate ECU circuit
ECM
ECM circuit
C0365 / 43
(DI-285)Malfunction in deceleration sensor (combined in yaw rate sen-
sor)Deceleration sensor
Deceleration sensor circuit
C1202 / 44
(DI-290)Brake fluid level low
Open circuit in brake fluid level warning switch circuitBrake fluid level
Brake fluid level warning switch
Brake fluid level warning switch circuit
C1350 / 51
(DI-306)Pump motor is locked
Open circuit in pump motor groundBrake actuator pump motor
Brake actuator pump motor circuit
C1351 / 52
(DI-308)VSC pump motor is locked
Open or short circuit in VSC pump motor circuitPrecharge pump motor
Precharge pump motor circuit
C1246 / 53
(DI-300)Malfunction in master cylinder pressure sensorMaster cylinder pressure sensor
Master cylinder pressure sensor circuit
C1208 / 54
(DI-292)Malfunction in steering angle sensorSteering angle sensor
Steering angle sensor circuit
C0371 / 55
(DI-287)Malfunction in yaw rate sensor circuitYaw rate sensor
Yaw rate sensor circuit
Always ON
(DI-322)Malfunction in ABS & BA & TRAC & VSC ECU
Open circuit in VSC warning light circuitCharging system
VSC warning light circuit
*: Troubleshoot according to the DTC chart of the translate ECU.
Page 721 of 1897
DI-260
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
416 Author: Date:
2001 AVALON (RM808U)
DTC chart of translate ECU(output NG code DTC of VSC system C1301/42 only):
DTC No.
(See Page)Detection ItemTrouble Area
Normal code*
(DI-317)Malfunction in ECM control system
ECM circuit
ECM
Brake fluid level
Brake fluid level warning switch circuit
Steering angle sensor
ABS & BA & TRAC & VSC ECU
42
(DI-31 1)Malfunction in communication with the ABS & BA & TRAC &
VSC ECUVSC+ or VSC- circuit
Translate ECU
ABS & BA & TRAC & VSC ECU
44
(DI-313)Open or short circuit in NEO circuit
NEO circuit
ECM
Translate ECU
53
(DI-315)Malfunction in communication with the ECM
TRC+ or TRC- circuit
ENG+ or ENG- circuit
ECM
Translate ECU
Non code
(DI-318)Malfunction in translate ECU
Tc terminal circuit
BRAKE warning light circuit
Translate ECU
*: Translate ECU is normal.
HINT:
The BRAKE warning light does not turn on due to an error in VSC.
If it is on, check that the parking brake pedal is released, the brake fluid level is normal and no malfunction
is identified in the fluid level warning switch system.
