TOYOTA AVALON 2001 Service Repair Manual
Page 691 of 1897
F07901
2 1
(-)(+)
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-309
465 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 TOYOTA hand-held tester.
1 Check precharge pump motor operation.
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 the operation sound of the precharge pump motor when operating it with the TOYOTA hand-held
tester.
OK:
The operation sound of the precharge pump motor should be heard.
NG Go to step 3.
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.
2 Check precharge pump motor operation.
PREPARATION:
Disconnect the connector from the precharge pump motor.
CHECK:
Connect ML+ (2) terminal to the battery positive (+) and ML- (1)
terminal to the battery negative (-).
OK:
The operation sound of the pump motor should be
heard.
NG Check and replace precharge pump.
OK
Page 692 of 1897
DI-310
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
466 Author: Date:
2001 AVALON (RM808U)
3 Check for open and short circuit in harness and connector between precharge
pump 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.
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 694 of 1897
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
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 696 of 1897
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.
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 698 of 1897
F10171
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
DI-316
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
472 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check translate ECU communication.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the translate ECU.
(b) Connect the oscilloscope to each of the terminals ENG+
or TRC+ and GND of the translate ECU harness side con-
nector.
CHECK:
Start the engine, and check the signal waveform.
OK Check and replace translate ECU.
NG
2 Check for open and short circuit in harness and connector between each of ter-
minals ENG+, ENG-, TRC+ and TRC- of translate ECU and ECM (See page
IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
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 700 of 1897
DI-318
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
474 Author: Date:
2001 AVALON (RM808U)
DTC Non Code Translate ECU Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
Non CodeTranslate ECU internal malfunction is detected.
Tc terminal circuit
Brake warning light circuit
Translate ECU
INSPECTION PROCEDURE
1 Check the BRAKE warning light circuit (See page DI-330).
NG Repair or replace the BRAKE warning light cir-
cuit.
OK
2 Check the Tc terminal circuit (See page DI-342).
NG Repair or replace the Tc terminal circuit.
OK
Check and replace Translate ECU.
DI6OF-04