2001 TOYOTA AVALON Service Repair Manual

N16045
3
4
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-591
747 Author
: Date
:
2001 AVALON (RM808U)
2 Check cancel switch continuity.
PREPARATION:
(a) Remove steering wheel center pad (See page SR-12).
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 3 and 4 of control switch
connector when cancel switch is held ON and OFF.
OK:
Switch positionTester connectionSpecified condition
OFF3 - 4No continuity
Hold ON3 - 4Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and cancel switch
(See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

I13610
Cruise Control ECU
4
PI
R-B
W-B10
1D
IF17W-R
4 IG1 AM1Ignition Switch 2
W
AM1 GAUGE NO. 1
2 1
5
B-L1
ALTFL Block
1 B
FL MAIN
BatteryF8 2G1
F6 F10
1
1
2H
B 5
W-LW-L 1
43 3
1B1
1G
4
1C IG1 RERAY 4
4D13
4F4
M7 M64
4H17
4A17
GR-R
R-BGR-R Cruise Control
Indicator Light
(in Multi Display)
IG
C15
I15
2J/B No. 4 J/B No. 4
Driver Side J/B
Engine Room R/B No. 5
Engine Room J/B DI-592
- DIAGNOSTICSCRUISE CONTROL SYSTEM
748 Author
: Date
:
2001 AVALON (RM808U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator light lights up.
WIRING DIAGRAM
DI090-28

AB0119
I00144
I00178
ON
PI
(-) (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-593
749 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals PI and GND of cruise control ECU connector.
PREPARATION:
Tun ignition switch ON.
CHECK:
Measure voltage between terminals PI and GND of cruise con-
trol ECU connector when main switch is ON and OFF.
OK:
Switch positionVoltage
OFF10 - 16 V
ONBelow 1.2 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
2 Check combination meter (See page BE-2).
NG Replace combination meter.
OK
Check and replace cruise control ECU (See
page IN-30).

I13609
Cruise Control ECU
4
PI
5
TC GR-R 10
4 DLC2
22 DLC1
II23B
LG-R A/D
Tc
Tc13
LG-R3A 13
3G 4 4A17
4B17
GR-R
LG-R
4H6
4A6
LG-R LG-R11D2
D1
C15
J/B No. 4
J/B No. 3
J/B No. 4 DI-594
- DIAGNOSTICSCRUISE CONTROL SYSTEM
750 Author
: Date
:
2001 AVALON (RM808U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that outputs DTC.
WIRING DIAGRAM
DI091-15

AB0119
I00169
I00179
ON
TC E1
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-595
751 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC2.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC2.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
2 Check harness and connector between cruise control ECU and DLC2, DLC2 and
body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

I13611
Cruise Control ECU
9
B
Y-R
IG B 3 1
4IG1 RELAY
2
AM1 ECU-IG NO. 2
5 5
B-L
ALT FL Block
F6
B
FL MAIN
BatteryW-BW-B 1
2G
F8
W-B AA
J5
J/C 1 F101 1
1G
3
1B
1
2H13
1B
4
1C2
3C2
3D
7
IF1
7
3A20
3BGND
1W-B16 W-B WY-R
W-R42
I15Ignition Switch
C15
W-L
W-L
B-LIG1 AM1
2
1J/B No. 3
Driver Side J/B
Engine Room J/B
Engine Room R/B No. 5
J/B No. 3
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-587
743 Author
: Date
:
2001 AVALON (RM808U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc, when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI08X-15

I14465
ECU-IG
Fuse
AB0119
I00147
I00176
ON
GND
(-) (+)B
DI-588
- DIAGNOSTICSCRUISE CONTROL SYSTEM
744 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check ECU-IG fuse.
PREPARATION:
Remove the ECU-IG fuse from instrument panel junction block.
CHECK:
Check continuity of ECU-IG fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to ECU-IG fuse.
OK
2 Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
10 - 14 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG

I00140
GND
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-589
745 Author
: Date
:
2001 AVALON (RM808U)
3 Check resistance between terminal GND of cruise control ECU connector and
body ground.
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery (See
page DI-560).