engine TOYOTA AVALON 2001 Service Repair Manual

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.

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

F09821
ABS & BA &
TRAC & VSC ECU
1
A20
IG1
IJ Engine Room R/B No. 5J/B No. 3
J9
J/C
FL MAIN
BatteryEngine Room J/B
Y-R
J/B No. 4
18
4A 18
4H
Y-R Y-R11
3F 2
3C Driver Side J/B
Ignition Switch
ALTGND2 IG1 RelayECU-IG
No. 2
W-R13
1B
3
1B 1
1G
4
1C1
2
4 3
4
IG1
AM1AM1
B-L 2 W-L7
IF1W-L
55 21
B
1
2H 1
2G
F8 F101 1
F61GND1 29
A20
28
A20 W-B
W-B
W-B A
J5
J/C
J4
J/C A
AB
B W-B
W-B
W-B
IG W-B
W-B
FL Block W
B
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-297
453 Author
: Date
:
2001 AVALON (RM808U)
DTC C1241 / 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the brake actuators.
DTC No.DTC Detecting ConditionTrouble Area
C1241 / 41
At a vehicle speed of 6 km/h (4 mph) or more, the condition
that low battery voltage is 9.8 V or less (during non-opera-
tion of ABS control) or 9.4 V or less (during operation of
ABS control) and high battery voltage is more than 17.4 V,
continues for 0.5 sec. or more.

Battery

Charging system

Power source circuit
WIRING DIAGRAM
DI6O6-03

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

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

F09809
59
W
A20
SS1 ABS & BA & TRAC
& VSC ECU
61
A20
SS2
60
A20
FSS BR
(Shielded) Translate ECU
O 4
T5
17
T5 VSC+
VSC-
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-31 1
467 Author
: Date
:
2001 AVALON (RM808U)
DTC 42 ECU Communication System Malfunction
CIRCUIT DESCRIPTION
The circuit is used to send TRAC & VSC control information from ABS & BA & TRAC & VSC ECU to the
translate ECU (VSC+, VSC-), engine control information and steering angle information from translate ECU
to ABS & BA & TRAC & VSC ECU
DTC No.DTC Detecting ConditionTrouble Area
42IG1 voltage is 9.5 V or more, and the condition that data
from ECU can not be received continues for 5 sec. or more.
VSC+ or VSC- circuit

Translate ECU

ABS & BA & TRAC & VSC ECU
WIRING DIAGRAM
DI6OC-03

F10171
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
DI-312
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
468 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check DTC of translate ECU.
Check DTC on page DI-252.
*1 Repair circuit indicated by the output code.
*2
2 Check transrate ECU communication.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the translate ECU.
(b) Connect the oscilloscope to the terminal VSC+ (4) and
GND (14) of the translate ECU harness side connector.
CHECK:
Start the engine, and check the signal waveform.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
3 Check for open and short circuit in harness and connector between each of ter-
minals VSC+ and VSC- of translate ECU 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.
*1: Output NG code
*2: Output nomal code

F09807
Translate ECU
13
T5 ECM
NEO
NEO16
E7Y-B
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-313
469 Author
: Date
:
2001 AVALON (RM808U)
DTC 44 NEO Signal Circuit
CIRCUIT DESCRIPTION
The ABS & BA & TRAC & VSC ECU receives engine revolution speed signals (NEO signal) from the ECM.
DTC No.DTC Detecting ConditionTrouble Area
44
When either of the following 1. or 2. is detected:
1. The vehicle speed is 30 km/h (19 mph) or more, and
open or short condition of the engine revolution signal
under the normal communication condition with ECU
continues for 10 secs. or more.
2. While cancel of cruise control is instructed from VSC
ECU, open or short condition of the engine revolution
signal continues for 0.24 sec. or more.

NEO circuit

ECM

Translate ECU
WIRING DIAGRAM
DI6OD-03

F09477
ON
NEO
13
F03007
(Reference)
3 - 6 V
Below 1 V
DI-314
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
470 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between terminal
NEO of translate ECU and terminal NEO of ECM (See page IN-30).
NG Repair or replace harness and connector.
OK
2 Check voltage between terminal NEO (13) of translate ECU and body ground.
PREPARATION:
Remove the translate ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminal 13 of the translate
ECU and body ground under the engine conditions below.
OK:
Engine conditionVoltage
OFF (IG ON)3 - 6 V or below 1 V
ON (Idling)3 - 6 V e below 1 V (Pulse)
NG Check and replace ECM.
OK
Check and replace transrate ECU.
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.

F09815
ECM
TRC- G-W
BRTranslate ECU
7
T5
TRC+ 20
T5
ENG- 9
T5
ENG+ 22
T5 GR
V TRC-
TRC+
ENG-
ENG+20
E8
13
E8
21
E8
14
E8
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-315
471 Author
: Date
:
2001 AVALON (RM808U)
DTC 53 ECM Communication Circuit Malfunction
CIRCUIT DESCRIPTION
The circuit is used to send TRAC & VSC control information from the translate ECU to the ECM (TRC+,
TRC-), and engine control information from the ECM to the translate ECU (ENG+, ENG-).
DTC No.DTC Detecting ConditionTrouble Area
53
When any of the following 1. through 3. is detected :
1. IG1 voltage is 8.5 V or more, and the condition that data
can not be sent to ECM continues for 5 sec. or more.
2. IG1 voltage is 8.5 V or more, engine speed is 500 r.p.m
or more, and the condition that data can not be received
from ECM continues for 5 sec. or more.
3. The condition that data can not be transmitted between
the translate ECU and ECM occurs at least once within
5 sec. continues 10 consecutive times.

TRC+ or TRC- circuit

ENG+ or ENG- circuit

ECM

Translate ECU
WIRING DIAGRAM
DI6OE-03