2001 TOYOTA AVALON Service Repair Manual

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

AB0119
I00167
I00172
ON
IDL
(-) (+)
DI-576
- DIAGNOSTICSCRUISE CONTROL SYSTEM
732 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check voltage between terminal IDL of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Disconnect the ECM connector.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL of ECU connector and
body ground when the throttle valve is fully closed and fully
opened.
OK:
Throttle valve positionVoltage
Fully opened10 - 14 V
Fully closedBelow 2 V
OK Proceed to next circuit inspection shown in
problem symptom table (See page DI-560).
NG
2 Check harness and connector between ECM and throttle position sensor (See
page IN-30).
NG Repair or replace harness or connector.
OK
3 Check throttle position sensor circuit (See page DI-38).
NG Replace throttle position sensor.
OK

- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-577
733 Author
: Date
:
2001 AVALON (RM808U)
4 Check throttle position sensor.
NG Replace throttle position sensor.
OK
5 Check for open and short in harness and connector between cruise control ECU
and ECM (See page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN-30).

DI-596
- DIAGNOSTICSCRUISE CONTROL SYSTEM
752 Author
: Date
:
2001 AVALON (RM808U)
Actuator Control Cable
INSPECTION PROCEDURE
1 Actuator control cable inspection
OK:
(a) Check that the actuator and control cable throttle link are properly installed and that the cable and link
are connected correctly.
(b) Check that the actuator and bell crank operate smoothly.
(c) Check that the cable is not loose or too tight.
OK:
Freeplay: less than 10 mm
HINT:

If the control cable is very loose, the vehicle's loss of speed going uphill will be large.

If the control cable is too tight, the idle RPM will become high.
DI6L9-01

AB0119
I00145
I00177
ON
CAN
(-) (+)
DI-590
- DIAGNOSTICSCRUISE CONTROL SYSTEM
746 Author
: Date
:
2001 AVALON (RM808U)
Cancel Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control cancel switch is turned ON, the cruise control does not operate.
WIRING DIAGRAM
See page DI-572.
INSPECTION PROCEDURE
1 Check voltage between terminal CAN 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 terminal CAN of cruise control ECU
connector when main switch is held ON and OFF.
OK:
Main switchVoltage
OFF10 - 14 V
ONBelow 0.5 V
OK Proceed to next circuit inspection shown on
problem symptom table (See page DI-560).
NG
DI6L8-01