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DI-347
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
DI6CO-03
DTC Always ON Malfunction in ECU
VSC TRAC Warning Light Circuit
CIRCUIT DESCRIPTION
DTC No. DTC Detecting Condition Trouble Area
S Power source circuit
Always ON There is a malfunction in the ECU internal circuit. S VSC TRAC warning light circuit
S Skid control ECU
HINT:
If fail safe function is activated in VSC system, the "VSC OFF" indicator light lights up.
WIRING DIAGRAM
Skid Control ECU
Driver Side J/B Combination Meter
GAUGE 8 12 VSC TRAC 10 4
B-Y V-W
1F C29 C25 V18 VSCW
2 ECU-IG 3 7
B-Y Y
1I 1G V19 IG1
I14 Engine Room R/B
Ignition Switch
AM1 ALT
W
2 2
4 IG1 AM1 2 2 1 2 1
W
6
W-B
V16 GND2
31
W-B
V16 GND1
J9
8
W-B
V19 GND3
A
J/C J4
16
W-B
V19 GND4
A
Battery J/C
EA IF IE
F14352
2002 4RUNNER (RM887U)
Author : Date : 523
DI-348
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
INSPECTION PROCEDURE
1 Check that ECU connectors are securely connected to ECU.
NO Connect the connector to ECU.
YES
2 Is DTC output for VSC?
Check DTC on page DI-224 .
YES Repair circuit indicated by the output code.
NO
3 Does VSC TRAC warning light go off?
YES Check for open and short circuit in harness and
connector between ECU-IG fuse and ECU (See
page IN-28 ).
NO
2002 4RUNNER (RM887U)
Author : Date : 524
DI-349
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
4 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair the charging system.
OK
5 Check operation of VSC TRAC warning light.
In case of using the hand-held tester:
PREPARATION:
(a) Connect the hand-held tester to DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check that "ON" and "OFF" of the VSC TRAC warning light can be shown on the combination meter on the
hand-held tester.
In case of not using the 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 that the VSC TRC warning light goes off.
NG Check and replace combination meter
( See page BE-40 ).
OK
2002 4RUNNER (RM887U)
Author : Date : 525
DI-350
DIAGNOSTICS - ABS WITH EBD & BA & TRAC & VSC SYSTEM
6 Check for short circuit in harness and connector between combination meter
and skid control ECU, combination meter and DLC1 (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU
2002 4RUNNER (RM887U)
Author : Date : 526
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