Page 775 of 1897

DI-164
- DIAGNOSTICSAUTOMATIC TRANSAXLE
320 Author: Date:
2001 AVALON (RM808U)
(b) Clearance the DTC.
The following operation will erase the DTC and freeze
frame data. Operating an OBD II scan tool (complying
with SAE J1978) or TOYOTA hand-held tester to erase
the codes (See the OBD II scan tool's instruction book for
operating instructions.).
4. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 - 80 °C (122 - 176 °F).
(a) D position test
Shift into the D position and fully depress the accelerator pedal and check the following points:
(1) Check up-shift operation.
Check to see that 1 " 2, 2 " 3 and 3 " O/D up-shift takes place,and that the shift points conform
the automatic shift schedule (See page SS-24).
HINT:
O/D Gear Up-shift Prohibition Control (1. Coolant temp. is 60 °C (140 °F) or less. 2. If there is a 10
km/h (6 mph) difference between the set cruise control speed and vehicle speed.)
O/D Gear Lock-up Prohibition Control (1. Brake pedal is depressed. 2. Coolant temp. is 60 °C (140
°F) or less.)
(2) Check for shift shock and slip.
Check for shock and slip at the 1 " 2, 2 " 3 and 3 " O/D up-shifts.
(3) Check for abnormal noises and vibration.
Run at the D position lock-up or O/D gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss of balance in the differential torque converter clutch, etc.
(4) Check kick-down operation.
While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick-down
vehicle speed limits for 2 " 1, 3 " 2 and O/D " 3 kick-downs conform to those indicated in the
automatic shift schedule (See page SS-24).
(5) Check abnormal shock and slip at kick-down.
(6) Check the lock-up mechanism.
Drive in D position, O/D gear, at a steady speed (lock-up ON) of about 60 km/h (37 mph).
Lightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
If there is a big jump in engine speed, there is no lock-up.
(b) 2 position test
Shift into the 2 position and fully depress the accelerator pedal and check the following points:
(1) Check up-shift operation.
Check to see that the 1 " 2 up-shift takes place and that the shift point conforms to the automatic
shift schedule (See page SS-24).
HINT:
There is no O/D up-shift and lock-up in the 2 position.
(2) Check engine braking.
While running in the 2 position and 2nd gear, release the accelerator pedal and check the engine
braking effect.
(3) Check for abnormal noises during acceleration and deceleration, and for shock at up-shift and
down-shift.
Page 846 of 1897
DI08M-14
Duty Ratio =A + BA
x 100 (%)
ON
OFFA
B
1 cycle
I13618
Cruise Control ECU
MC MO
R-B Cruise Control Actuator
R 1
215
C4
C15
MO
MCP
P II1 15
II1 14
7
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-561
717 Author: Date:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC 11, 15 Actuator Motor Circuit
CIRCUIT DESCRIPTION
The actuator motor is operated by signals from the ECU. Acceleration and deceleration signals are trans-
mitted according to changes in the Duty Ratio (See below).
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one cycle, and B is the period of non-continuity.
DTC No.Detection ItemTrouble Area
11Short in actuator motor circuit.
Actuator motor
Harness or connector between cruise control ECU and
actuator motor
Cruise control ECU
15Open in actuator motor circuit.Actuator motor
WIRING DIAGRAM
Page 847 of 1897
I00004
I00151
2
1
DI-562
- DIAGNOSTICSCRUISE CONTROL SYSTEM
718 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check resistance between terminals MO and MC of actuator motor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 1 and 2.
HINT:
If control plate is in fully opened or fully closed positions, resis-
tance can not be measured.
OK:
Resistance: more than 4.2 W
NG Replace cruise control actuator.
OK
2 Check for open and short in harness and connectors between cruise control
ECU and actuator motor (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN-30).
Page 848 of 1897

I13617
Cruise Control ECU
4 3
3
W-B8 Stop Light Switch
4Cruise Control Actuator
13
II1
IJJ9
J/CL
9P-B P-B G-B GNDL
AC4
S4
C15
W-B II1
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-563
719 Author: Date:
2001 AVALON (RM808U)
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph), cruise control at the
set speed is resumed.
DTC No.Detection ItemTrouble Area
12Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in 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
WIRING DIAGRAM
DI08N-15
Page 849 of 1897
I14465
STOP Fuse
I00133
21
43
DI-564
- DIAGNOSTICSCRUISE CONTROL SYSTEM
720 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check STOP fuse.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block.
CHECK:
Check fuse continuity.
OK:
There is continuity.
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch positionContinuity
Switch pin free
(Brake pedal depressed)1 - 2
Switch pin pushed in
(Brake pedal released)3 - 4
NG Replace stop light switch.
OK
Page 850 of 1897
I00311
4
3
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-565
721 Author: Date:
2001 AVALON (RM808U)
3 Check resistance between terminals L and GND of actuator magnetic clutch.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 3 and 4.
OK:
Resistance: 34.65 - 42.35 W.
NG Replace cruise control actuator.
OK
4 Check for open and short in harness and connectors between cruise control
ECU and actuator magnetic clutch, actuator magnetic clutch 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).
Page 851 of 1897
I00055
4
3(+)
(-)
DI-566
- DIAGNOSTICSCRUISE CONTROL SYSTEM
722 Author: Date:
2001 AVALON (RM808U)
DTC 14 Actuator Mechanical Malfunction
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and sends a signal to the ECU.
DTC No.Detection ItemTrouble Area
14Cruise control actuator mechanical malfunction.
Actuator lock: (motor, arm)
Actuator motor
Cruise control ECU
WIRING DIAGRAM
See page DI-563.
INSPECTION PROCEDURE
1 Check cruise control actuator arm locking operation
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
(a) Connect the positive (+) lead from the battery to the termi-
nal 3 of actuator and the negative (-) lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. The cruise control actuator will be damaged.
(b) Move the control plate by hand.
OK:
Control plate doesn't move.
NG Replace cruise control actuator.
OK
DI08O-14
Page 852 of 1897
I03209
Fully open side
Fully Closed sideControl plate
Control plate(+)
(-) (+)
(-) 4
321
4
3
21
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-567
723 Author: Date:
2001 AVALON (RM808U)
2 Check cruise control actuator operation.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Connect the positive (+) lead from the battery to terminals 1 and
3 of actuator, connect the negative (-) lead to terminals 2 and
4 of actuator.
OK:
Control arm moves to fully open side
CHECK:
Connect the positive (+) lead from the battery to terminals 2 and
3 of actuator, connect the negative (-) lead to terminals 1 and
4 of actuator.
OK:
Control arm moves to fully colsed side
NG Replace cruise control actuator.
OK
3 Check harness and connector between cruise control ECU and cruise control ac-
tuator (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).