2001 TOYOTA AVALON cruise control

I00292
Vehicle Speed Sensor
ECUCombination Meter
Cruise Control ECU
4 pulses/
1 rotation
of rotor shaft4 pulses/
1 rotation
of rotor shaft
I13616
Cruise Control ECU
12 Combination Meter
3C10
V-W V-W
Y-R BR
to
ABS ECU3F1
M322
M3 M37
BR IJ1 11
EBM3
to ECU-IG Fuse 18
SPD
C15
J/B No. 3
1 DI-568
- DIAGNOSTICSCRUISE CONTROL SYSTEM
724 Author
: Date
:
2001 AVALON (RM808U)
DTC 21 Open in Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The signal from the vehicle speed sensor circuit is sent to cruise control ECU as vehicle speed signal.
The rotor shaft is driven by the gear of the transmission.
For each rotation of the shaft, the vehicle speed sensor sends a 4-pulse signal through the combination
meter to the cruise control ECU (See the following installation).
This signal is converted inside the combination meter and sent as a 4-pulse signal to the cruise control ECU.
The ECU calculates the vehicle speed from this pulse frequency.
DTC No.Detection ItemTrouble Area
21Speed signal is not input to the cruise control ECU while cruise
control is set.

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
WIRING DIAGRAM
DI08P-18

Input SignalIndicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higherLightON
OFF
LightON
OFF
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-569
725 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Input signal check.
CHECK:
(a) See input signal check on page DI-551.
(b) Check indicator light operation when driving with vehicle
speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).
OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays on
OK Check and replace cruise control ECU (See
page IN-30).
NG
2 Check speedometer circuit (See Combination meter troubleshooting on page
BE-2).
NG Repair or replace harness, connector or com-
bination meter assembly.
OK
3 Check harness and connector between cruise control ECU and combination me-
ter, combination meter and vehicle speed sensor (See page IN-30).
NG Repair or replace harness or connector.
OK

DI-570
- DIAGNOSTICSCRUISE CONTROL SYSTEM
726 Author
: Date
:
2001 AVALON (RM808U)
4 Check vehicle speed sensor (See page BE-53).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN-30).

- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-571
727 Author
: Date
:
2001 AVALON (RM808U)
DTC 23 Vehicle Speed Signal Abnormal
CIRCUIT DESCRIPTION
See page DI-568.
DTC No.Detection ItemTrouble Area
23Vehicle speed sensor pulse is abnormal.
Vehicle speed sensor

Cruise control ECU
WIRING DIAGRAM
See page DI-568.
INSPECTION PROCEDURE
1 Check vehicle speed sensor (See page BE-53).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN-30).
DI08Q-13

I13615
Cruise Control ECU
W-L
W-BW-B
MAINCANCEL
COAST/
SETRES/
ACC 41
10 3A
53
W
IG
J5
J/C 20
73A
A
A
W-BCAN
CCS Cruise Control Switch
C12
C15
J/B
No. 3 DI-572
- DIAGNOSTICSCRUISE CONTROL SYSTEM
728 Author
: Date
:
2001 AVALON (RM808U)
DTC 32 Control Switch Circuit (Cruise Control
Switch)
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signals (each voltage) to the ECU.
DTC No.Detection ItemTrouble Area
32Short in 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
WIRING DIAGRAM
DI08R-16

Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF3 Pulses
ON
OFFSW OFF
SW ON
AB0119
I00168
I00171
ON
CCS
(-) (+)
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-573
729 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI-551.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.
OK Wait and see.
NG
2 Check voltage between terminals CCS of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals 18 of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL is turned ON.
Switch positionResistance (V)
Neutral10 - 16 V
MAINBelow 1V
REST/ACC4.7 - 7.7 V
SET/COAST2.6 - 4.2 V
NG Proceed to next circuit inspection shown in
problem symptom table (See page DI-560)
OK

I11618
32
DI-574
- DIAGNOSTICSCRUISE CONTROL SYSTEM
730 Author
: Date
:
2001 AVALON (RM808U)
3 Check control switch.
PREPARATION:
(a) Remove steering wheel center pad.
(b) Disconnect the control switch connector.
CHECK:
Measure resistance between terminals 2 and 3 of control switch
connector when control switch is operated.
Switch positionResistance (W)
Neutral8 (No continuity)
MAIN0 W (Continuity)
RES/ACC240
SET/COAST630
NG Replace control switch.
OK
4Check harness and connector between cruise control ECU and cruise control switch,
cruise control switch and body ground (See page IN-30).
NG Repair or replace harness or connector.
OK
5 Input signal check (See step 1).
OK Wait and see.
NG
Check and replace cruise control ECU (See
page IN-30).

I13614
IDL 13
IDLOE725 ECMCruise Control ECU
Y
C15
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-575
731 Author
: Date
:
2001 AVALON (RM808U)
DTC 51 Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch is turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor value to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-
gine, so also inspect the engine.
DTC No.Detection ItemTrouble Area
51Short in idle signal circuit.

Harness or connector between ECM and throttle position
sensor

Throttle position sensor

Harness or connector between cruise control ECU and ECM

Cruise control ECU
WIRING DIAGRAM
DI6L6-01