TOYOTA AVENSIS 2005 Service Repair Manual

±
DIAGNOSTICS ABS WITH EBD & BA & TRC & VSC SYSTEM
05±837
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 if you are using the hand±held tester and\
start from step 2 if you are not using
the hand±held tester.
1PERFORM ACTIVE TEST BY HAND±HELD TESTER(ABS WARNING LIGHT)
(a)Check that ºONº and ºOFFº of the ABS warning light is shown on th\
e combination meter by the hand±
held tester.
OKREPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)
NG
2 INSPECT ABS WARNING LIGHT
(a)See combination meter troubleshooting on page 71±1. NG REPAIR OR REPLACE COMBINATION METERASSEMBLY
OK
3 CHECK HARNESS AND CONNECTOR(SKID CONTORL ECU ± CMBINATION METER)
(a) Check for an open or short circuit in harness and connector between the skid \
control ECU and com-
bination meter (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
REPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)

05±844
± DIAGNOSTICSABS WITH EBD & BA & TRC & VSC SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
TRC OFF INDICATOR, TRC CUT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
This is the TRC control main switch. When the TRC OFF switch is pressed, TRC control goes off and the
TRC OFF indicator illuminates. Also, turn the TRC OFF indicator light to ºONº when the VSC system is at
the fail safe control. If the ignition switch is turned off, TRC control surely comes on the next time the ignition
switch is turned ON.
0543I±04

F45146
Center J/BCombination MeterSkid Control ECU
With Actuator
76
CA CDR±W21
C11
TRC OFFC1117
7
IE1
B±GLG±B LG±B2
S1
WT
Driver Side J/B
7
DB
1
DN
5
DHIG1 Relay
GAUGE1
1 253
9
DA
1
DH AM1W±B
I13
Ignition SW
G±R
G±YAM1
IG11 3
Engine Room J/B No.4
(*1)
(*1)B±G
Engine Room R/B No.3
(*2)
B±L1
ED1(*2)
W 1
4D1
4B ALT
ALT 12
33
1 2
FL MAIN
BatteryJ16
J/CT9
TRC Off SW
(*4)
W±B(*4)
W±B
AAG±Y G±Y
6914 42
IE1 S1 CSW
Center J/B
10 6
C1 CA
(*3) W±B(*3)
W±B
IP
IJIL(*2)
B
*1: 1AZ±FSE
*2: 1CD±FTV*3: LHD
*4: RHD R±W
± DIAGNOSTICSABS WITH EBD & BA & TRC & VSC SYSTEM
05±845
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

C94394
2
3
4
5
6
7
8
9
10
+
E
05±846
±
DIAGNOSTICS ABS WITH EBD & BA & TRC & VSC SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 if you are using the hand±held tester and\
start from step 2 if you are not using
the hand±held tester.
1PERFORM ACTIVE TEST BY HAND±HELD TESTER(TRC OFF INDICATOR LIGHT)
(a)Check that ºONº and ºOFFº of the TRC OFF indicator light is shown on the combinati\
on meter by the hand±held tester.
OKREPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)
NG
2INSPECT TRC OFF INDICATOR LIGHT
(a)See combination meter troubleshooting on page 71±1. NGREPAIR OR REPLACE COMBINATION METERASSEMBLY
OK
3INSPECT TRACTION CONTROL SWITCH
(a)Remove the TRC OFF switch.
(b)Disconnect the TRC OFF switch connector.
(c)Measure resistance between terminals + and E of the TRC OFF switch when the TRC OFF switch is ON and
OFF.
OK:
TRC OFF switchResistance
Pushed inContinuity
Released1M
or higher
NGREPLACE TRACTION CONTROL SWITCH
OK
4CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU ± TRC OFF SWITCH)
(a)Check for an open or short circuit in harness and connector between terminal \
CSW of the skid control ECU and TRC OFF switch (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK

±
DIAGNOSTICS ABS WITH EBD & BA & TRC & VSC SYSTEM
05±847
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU ± COMBINATION
METER)
(a)Check for an open or short circuit in harness and connector between the skid \
control ECU and com-
bination meter (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
REPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)

F45144
Combination MeterSkid Control ECU
With Actuator
Engine Room J/B No.4 Engine Room R/B No.1 & Engine Room J/B No.1
Engine Room R/B No.3Driver Side J/BI13
Ignition SW
IG2 AM2
B±R B±RB±R B±W22
C1115
C11
SlipLG8
IE1LG4
S1
CACA
J8 J26 J8 J26
(*3) (*4)
(*3) (*4)B±W18
DA2
DH
1
1A 1
12AM2
1
4A1
4B
3 3 B±G (*1) B±G (*1)FL MAIN
B (*2) B (*2)Battery 1
IE4
(*3)1
IP1
(*4)64 IGN J/CIND
*1: 1AZ±FSE
*2: 1CD±FTV*3: LHD
*4: RHD 05±848
± DIAGNOSTICSABS WITH EBD & BA & TRC & VSC SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
SLIP INDICATOR LIGHT CIRCUIT
CIRCUIT DESCRIPTION
The SLIP indicator blinks during TRC & VSC operation.
WIRING DIAGRAM
0543J±04

±
DIAGNOSTICS ABS WITH EBD & BA & TRC & VSC SYSTEM
05±849
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 if you are using the hand±held tester and\
start from step 2 if you are not using
the hand±held tester.
1PERFORM ACTIVE TEST BY HAND±HELD TESTER(SLIP INDICATOR LIGHT)
(a)Check that ºONº and ºOFFº of the SLIP indicator light is shown on\
the combination meter by the hand±
held tester.
OKREPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)
NG
2 INSPECT SLIP INDICATOR LIGHT
(a)See combination meter troubleshooting on page 71±1. NG REPAIR OR REPLACE COMBINATION METERASSEMBLY
OK
3 CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU ± COMBINATION METER)
(a) Check for an open or short circuit in harness and connector between terminal IND of the skid control
ECU and combination meter (See page 01±32).
NG REPAIR OR REPLACE HARNESS ORCONNECTOR
OK
REPLACE ABS & TRACTION ACTUATOR ASSY(See page 32±57)

± DIAGNOSTICSABS WITH EBD & BA & TRC & VSC SYSTEM
05±831
AVENSIS REPAIR MANUAL (RM1018E)
DTC AlwaysON MALFUNCTION IN ECU(VSC WARNING
LIGHT)
CIRCUIT DESCRIPTION
When the ECU stores DTC, the VSC warning light illuminates on the combination meter.
DTC No.DTC Detecting ConditionTrouble Area
Always ONMalfunction in skid control ECU

Battery

IC regulator

Power source circuit

Skid control ECU
0543E±04

F45147
Skid Control ECU
with Actuator
1
21
1A
1AM2
1 2 33
ALT Engine Room R/B No.3
3
W±B
S1 10
GND1GND2
S16 W±BW±B
EAB (*2)
IJB (*2)B±G (*1)
B±G (*1) FL MAIN
Battery1
ALT AM1
Engine Room J/B No.4
1
4B
1
22
4 AM2AM1
11
4A
4D1
ED11
IE41
IP1 B±RB±R B±G (*1)
B±L (*2)
W (*2)B±R DH DN
5 DB18 18
DA
1DH2
DA9
DH1 53IG1 Relay
ECU±IGIGN Driver Side J/B
G±R J/C
J8 J26 J8 J26CA CA
(*3) (*4) (*3) (*4)B±W B±WW±RR±W R±W
R±W
W±R J/C
J10 J20 J10 J20GC GC
(*3) (*4) (*3) (*4)
IE16 IE122
S1 14
S1 34
C1116
C1122
VSC Combination Meter
I13
Ignition SW
IG1
IG26 1 3IG1
VSCW
(*3) (*4)
B±G
(*1)
G±Y
Engine Room R/B No.1 &
Engine Room J/B No.1
*1: 1AZ±FSE
*2: 1CD±FTV*3: LHD
*4: RHDW±B 05±832
± DIAGNOSTICSABS WITH EBD & BA & TRC & VSC SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

C94397
GND
IG1
±
DIAGNOSTICS ABS WITH EBD & BA & TRC & VSC SYSTEM
05±833
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1CHECK DTC FOR VSC
(a)Check the DTCs are output (See page 05±756).
YESREPAIR CIRCUIT INDICATED BY OUTPUTCODE
NO
2INSPECT SKID CONTROL ECU CONNECTOR SECURELY CONNECTED
NOCONNECT CONNECTOR TO ECU
YES
3INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(IG1 TERMINAL)
WITH USING HAND±HELD TESTER:
(a)Check the voltage condition, which is output from the ECU and displayed \
on the hand±held tester. OK:
ºNormalº is displayed.
WITHOUT USING HAND±HELD TESTER:
(a)Disconnect the skid control connector.
(b)Turn the ignition switch ON.
(c)Measure the voltage between terminals IG1 and GND ofthe skid control ECU harness side connector.
OK:
Voltage: 10 to 14 V
OKREPLACE ABS & TRACTION ACTUATOR ASSY (See page 32±57)
NG
4 INSPECT BATTERY
OK:
Voltage: 10 to 14 V NG INSPECT CHARGING SYSTEM
OK