2001 TOYOTA AVALON cruise control

Input SignalIndicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to posi-
tions except D )LightON
OFFSW ON
SW OFF
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-585
741 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting.
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI-551.
CHECK:
Check the indicator light when shifting into positions except D.
OK:
The indicator light goes off when shifting into posi-
tions except D.
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG

AB0119
I00139
I00175
ON
D
(-) (+)
DI-586
- DIAGNOSTICSCRUISE CONTROL SYSTEM
742 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D position and other positions.
OK:
Shift PositionVoltage
D position10 - 14 V
Other positionsBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
4 Check harness and connector between cruise control ECU and park/neutral
position switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

I13608
Cruise Control ECU
2
STP
G-W
R3
3C 1B
1
4Stop Light Switch
2
95
FL BlockC15
C15 3
II1
BatterySTOP
W
B 1D33
3D
P-B
W-B
IJ AJ9 J/C W-BP-BG-B8
L F61
F101
ALT
FL MAIN1D11
1G1
II1 13
43
C4
Cruise Control Actuator
S4 Stop Light Switch
S4J/B No. 3
Driver Side J/B Driver Side J/B
G-W
G-W DI-578
- DIAGNOSTICSCRUISE CONTROL SYSTEM
734 Author
: Date
:
2001 AVALON (RM808U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail-safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP-
When the brake is ON, battery positive voltage normally is applied through the STOP fuse and stop light
switch to terminal STP- of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP- has an open circuit, terminal STP- will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF. (See page DI-563 for operation of the magnetic clutch)
WIRING DIAGRAM
DI08T-17

Input SignalIndicator Light
Blinking Pattern
Stop Light
switch ON
LightOFF
ONSW OFF
SW ON
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-579
735 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light comes ON when brake pedal is depressed, and turns OFF when brake pedal is re-
leased.
NG Check stop light system (See page BE-2).
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI-551.
(b) Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes OFF when the brake pedal is
depressed.
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG

AB0119
I00142
I00173
ON
STP-
(-) (+)
DI-580
- DIAGNOSTICSCRUISE CONTROL SYSTEM
736 Author
: Date
:
2001 AVALON (RM808U)
3 Check voltage between terminal STP- of cruise control ECU connector and
body ground.
PREPARATION:
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal STP- of cruise control ECU
connector and body ground, when the brake pedal is de-
pressed and released.
OK:
Depressed10 - 14 V
ReleasedBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
4 Check for open in harness and connectors between terminal STP- of cruise con-
trol ECU and stop light switch (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

DI08G-10
CRUISE CONTROL SYSTEM Check Sheet
Inspector 's name:
Customer 's Name
Date VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading / /km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occurs
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
Mile Brought in
Auto cancel
occurs
Driving condition
 City driving  Freeway  Up hill  Down hill

After cancel occurred, did the driver activate cruise control
again?
 Yes  No
 Cancel does not
occur With brake ON
 Except D position shift  At 40 km/h (25 mph) or less
 When control SW turns to CANCEL position
 Cruise control
malfunction Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut off does not occur
 O/D does not return
 Switch
malfunction SET  ACCEL  COAST  RESUME  CANCEL
 Cruise MAIN
indicator light Remains ON  Does not light up  Blinking Symptoms
DTC Check1st Time2nd Time
 Normal Code  Malfunction Code (Code )
 Normal Code  Malfunction Code (Code ) DI-550
- DIAGNOSTICSCRUISE CONTROL SYSTEM
706 Author
: Date
:
2001 AVALON (RM808U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI0EJ-09
DI-556
- DIAGNOSTICSCRUISE CONTROL SYSTEM
712 Author
: Date
:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Circuit InspectionTrouble Area
11, 15
(DI-561)Actuator Motor Circuit

Actuator motor

Harness or connector between cruise control ECU and
actuator motor

Cruise control ECU
12
(DI-563)Actuator Magnetic Clutch Circuit

STOP Fuse

Stop light switch

Actuator magnetic clutch

Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground

Cruise control ECU
14
(DI-566)Actuator Mechanical Malfunction
Actuator motor (actuator lock: motor, arm)

Cruise control ECU
21
(DI-568)Open in Vehicle Speed Sensor Circuit

Combination meter

Harness or connector between cruise control ECU and com-
bination meter, combination meter and vehicle speed sensor

Vehicle speed sensor

Cruise control ECU
23
(DI-571)Vehicle Speed Signal Abnormal
Vehicle speed sensor

Cruise control ECU
32
(DI-572)Control Switch Circuit

Cruise control switch

Harness or connector between cruise control ECU and cruise
control switch, cruise control switch and body ground

Cruise control ECU
41Cruise control ECU
Cruise control ECU
42Source voltage drop
Power source
51
(DI-575)Idle Signal Circuit

Throttle position sensor

Harness or connector between ECM and throttle position
sensor

Harness or connector between cruise control ECU and ECM

Cruise control ECU

DI08F-13
Customer Problem Analysis
Check and Clear DTC (Precheck)
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not occur
DTC CheckNormal code
DTC Chart
Problem Symptom Table
Circuit InspectionInput Signal Check
Parts Inspection
Identification of Problem
Repair
Confirmation Test
EndItems inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations. 1
2
34
5
6
7
89
10
Step 2, 5: Diagnostic steps permitting the use
of the hand-held tester or break-
out-box. P. DI-550
P. DI-551
P. DI-556
P. DI-556
P. IN-20
P. DI-560
P. DI-561 - DI-594
OKNG
Symptom occurs
Malfunction code
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-549
705 Author
: Date
:
2001 AVALON (RM808U)
CRUISE CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following page.