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DI-331
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6OH-02
DTC Always ON Malfunction in ECU
VSC Warning Light Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
Either of the following 1. or 2. is detected:
S Charging system
Always ON 1. There is a malfunction in the ECU internal circuit.
S VSC warning light circuit
2. There is a malfunction in VSC warning light circuit.
HINT:
TOYOTA hand-held tester may not be able to be used when ECU is defective.
WIRING DIAGRAM
Skid Control ECU
W GR
A
Engine
2 2D Room J17
4 J/B No. 2 J/C
A
100A 2 1D
INP
GR
Driver D
Fusible
Link 2 2L Side J18
140A
Block J/B No. 1 J/C
ALT
W 10A D
GAUGE
GR
1 1B
1 1 1K 9 C10
B-L 1 Driver
Combination VSC
Side
40A Meter Warning
J/B No. 1
AM1 Light
FL Main B-Y 4
2 4 C9
I12
Ignition
2 1K Switch GR-R
2 12
Battery
V14 VSCW
W-L
F13458
2001 SIENNA (RM787U)
Author : Date : 485
DI-332
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI-259 .
YES Repair circuit indicated by the output code .
NO
2 Check that the ECU connectors are securely connected to the ECU.
NO Connect the connector to the ECU.
YES
3 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair the charging system (See
page CH-2 ).
OK
4 Check the Tc terminal circuit (See page DI-351 ).
NG Repair or replace the Tc terminal circuit.
OK
2001 SIENNA (RM787U)
Author : Date : 486
DI-333
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
5 Check operation of the VSC warning light.
In case of using the TOYOTA hand-held tester:
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 that "ON" and "OFF" of the VSC warning light can be shown on the combination meter by the TOYOTA
hand-held tester.
In case of not using the TOYOTA hand-held tester:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Turn the ignition switch ON.
CHECK:
Check the VSC warning light goes off.
OK Check and replace skid control ECU.
NG
6 Check for short circuit in harness and connector between combination meter
and skid control ECU (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Check and replace combination meter.
2001 SIENNA (RM787U)
Author : Date : 487
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