2001 TOYOTA AVALON cruise control

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).

I13613
Cruise Control ECU
14
OD
6
ECT
G-Y
S2ECT No.2 SolenoidII221
B
6 ECM
GR OD1
S2E7
E6 24
1
G-Y G-YB
B
E1
C15
J8
J/C
G-Y
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-581
737 Author
: Date
:
2001 AVALON (RM808U)
Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under the cruise control, in order to reduce shifting due to ON-OFF overdrive operation
and to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a sig-
nal to prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically
controlled transmission.
Terminal ECT of the cruise control ECU detects the shift change signal (output to electronically controlled
transmission No. 2 solenoid) from the ECM.
If the vehicle speeds down, also when terminal ECT of the cruise control ECU receives down shifting signal,
it sends a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the gear shifts
are reduced and gear shift points in the electronically controlled transmission are changed.
WIRING DIAGRAM
DI08U-13

AB0119
I00143
I00174
ON
O/D
(-) (+)
DI-582
- DIAGNOSTICSCRUISE CONTROL SYSTEM
738 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of overdrive.
PREPARATION:
Test drive after engine warms up.
CHECK:
Check that overdrive ON e OFF occurs by operation of OD switch ON-OFF.
NG Check and repair electronically controlled
transmission (See page DI-158).
OK
2 Check voltage between terminal OD of harness side connector of cruise control
ECU and body ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
(c) Disconnect the ECU connector.
CHECK:
Measure voltage between terminal OD of harness side connec-
tor of ECU and body ground.
OK:
Voltage: 10 - 14 V
NG Go to step 5.
OK

I00141
ECT
(-) (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-583
739 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect the ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:
OD switch positionVoltage
ON8 - 14 V
OFFBelow 0.5 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
4 Check harness and connector between terminal ECT of cruise control ECU and
electronically controlled transmission solenoid (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5 Check harness and connector between terminal OD of cruise control ECU and
terminal OD1 of ECM (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

I17550
Cruise Control ECU
D 3
W-B 2
Ignition Switch1 II1
1G
3
4 4
2 1C
1
F10
1
ALT FL Block
1
FL MAINBattery IG1AM1CCS
F6 F8W-L26
1 20
AM1 Y-RY-R
R-L
R-LR-L
R-Y23
3D20
3C20
3C7
R-LY-R 4C6
4C19
II14
10 DL 2
W-R W
4
27
IF15
5 2
1
1 1
2H
2G
B-L1C1
1B3
IG B IG1 Relay
GAUGE NO. 2 A/T Indicator Light
Translate ECU
*1: w/ Traction Control
*2: w/o Tranction Control*1*2
T5
P1C15
I15
W-L
D6
DiodeY-R
*3: Floor Shift
*4: Column ShiftJ/B No. 4
J/B No. 3
*4
*3
Driver Side J/B
Engine Room R/B No. 5
BEngine Room J/B DI-584
- DIAGNOSTICSCRUISE CONTROL SYSTEM
740 Author
: Date
:
2001 AVALON (RM808U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is except D, a signal is sent from the park/neutral position switch to the ECU. When
this signal is input during cruise control driving, the ECU cancels the cruise control.
WIRING DIAGRAM
DI08V-15