Page 690 of 1897
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
Page 693 of 1897
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
Page 695 of 1897
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
Page 697 of 1897
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
Page 702 of 1897
F09822
ABS & BA &
TRAC & VSC ECU
IND A2031
V V18
IL1 M6 M69
4SLIP
R-B J/B No. 4
4D
4F 413
R-B
Driver Side J/B
1G1
1D10
1B1C 3 41 2IG1 Relay GAUGE
No. 1
W
W-R
2
IG1
AM1 4Ignition Switch
IF17
W-L
551
2 AM1 Engine Room R/B No. 5
B
2G
2H1 1 Engine Room J/B
B-L
F6 1 F10 F81
1
ALT FL Block
IG
Battery
FL MAIN
B Multi Display
4 3
W-BW-L
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-333
489 Author: Date:
2001 AVALON (RM808U)
SLIP Indicator Light Circuit
CIRCUIT DESCRIPTION
The SLIP indicator light blinks during TRAC & VSC operation.
WIRING DIAGRAM
DI6OL-03
Page 705 of 1897
F09806
ABS & BA &
TRAC & VSC ECU
A20 E1
EB
T5TC 84
LG-R
4A
4B 4H
4A6
19
196 LG-R
LG-R
LG-R 21
TC Translate ECU
W-B311LG-R D1
DLC1
TC22
II2 3A 3G4 13
LG-R D2
DLC2
E1 TC
4J/B No. 3 J/B No. 4
F10163
DLC2
Tc E
1DLC1
TcON
DI-342
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
498 Author: Date:
2001 AVALON (RM808U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting between terminals Tc and E1 of the DLC1 or the DLC2 causes the ECU to display DTC by blink-
ing the ABS warning light, VSC warning light and BRAKE warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Tc and E
1 of or
DLC1 or terminal Tc of DLC2 and body ground.
OK:
Voltage: 10 - 14 V
OK If each warning light does not blink even after Tc
and E
1 are connected, the ECU may be defec-
tive.
NG
DI6OO-01
Page 707 of 1897
F09808
ABS & BA &
TRAC & VSC ECU
A20TS 42
LG-B
4A
4B4A J/B No. 4
3
12
12 LG-B
LG-B LG-B
II2 11
16 3TS
D1
DLC1
EBW-B
T524
TS Translate ECU D3
DLC3
E1 TSLG-B LG-B
14
AB0119S08096
F00446
Ts
DLC1Ts
DLC1Ts
DLC1Ts
DLC1Ts
DLC1 ONTs
DLC1 E
1
DI-344
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
500 Author: Date:
2001 AVALON (RM808U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormality in the speed sensor signal which cannot be detected with the
DTC check.
Connecting terminals Ts and E
1 of the DLC1 starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Ts and E
1 of
DLC1.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, the ECU may be defec-
tive.
NG
DI6OP-03
Page 709 of 1897
F09811
Battery
FL MAIN
B F61 F10 F81
1
ALT
FL
BlockB-L
2G
2H1 1 5
5 1 2AM1 Engine Room R/B No. 5
Engine Room J/BB W-LW-L
IF17 W-R
2
IG1 AM1 4Ignition Switch WDriver Side J/B
1G1
1B 13
1B3
1C4
3
4 12 IG1 RelayECU-IG
No. 2
W-B
IG Y-R
L-WABS & BA &
TRAC & VSC ECU
A20 V9
VSC Warning
Buzzer
BZ 86
Buzzer1 2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-339
495 Author: Date:
2001 AVALON (RM808U)
VSC Buzzer Circuit
CIRCUIT DESCRIPTION
The VSC buzzer sounds during VSC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 3 in case
of not using the TOYOTA hand-held tester.
1 Check operation of the VSC buzzer.
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 ºON-OFFº function of the VSC buzzer with the TOYOTA hand-held tester.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
DI6ON-03
