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DI-563
DIAGNOSTICS - CRUISE CONTROL SYSTEM
DI219-03

PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
I03203
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE-2 ) for the combination meter
section.

(b) Check the DTC.
Indicator Light
HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
1.5 sec. 0.5 sec.
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
ON
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stored in memory as
OFF a diagnostic trouble code.
BE4034

DLC1 (c) Output of DTC using diagnosis check wire.
(1) Turn the ignition switch ON.
(2) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(3) Read the DTC on the CRUISE MAIN indicator light.

TC E1
I00002

2001 SIENNA (RM787U)

Author : Date : 717
DI-564
DIAGNOSTICS - CRUISE CONTROL SYSTEM

Normal Code HINT:
S If the DTC is not output, inspect the diagnosis circuit (See
0.25 sec. page DI-603 ).
0.25 sec.
S As an example, the blinking patterns for codes; normal,
11 and 21 are shown in the illustration.
ON

OFF

Malfunction codes 11 and 21
0.5 sec. 0.5 sec.

4 sec. 1.5 sec. 2.5 sec. 1.5 sec.

OFF
Code 11 Code 21
BE4032
BE4033 I00021

2. DTC CLEARANCE (ERASE MODE)
(d) 5 times
(b) HINT:
DLC1 Within 3 seconds
Under the erase mode, diag detection does not work.
(a) Drive at about 15 km/h or below.
(b) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(c) Pull the cruise control switch to CANCEL.
E1 TC (c) (d) On the above metioned condition, turn on the cruise con-
I01915 trol main switch 5 times within 3 seconds.

3. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
(a) Inspect the SET switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Pull the control switch to the SET/COAST.
(4) After releasing the switch, check that the vehicle
cruises at the desired speed.
N17520

2001 SIENNA (RM787U)

Author : Date : 718
DI-565
DIAGNOSTICS - CRUISE CONTROL SYSTEM

(b) Inspect the ACCEL switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed increases while the
control switch is turned to RES/ACC, and that the
vehicle cruises at the set speed when the switch is
released.
N17520 (4) Momentarily pull the control switch upward to RES/
ACC and then immediately release it. Check that
the vehicle speed increases by about 1.5 km/h
(Tap-up function).

(c) Inspect the COAST switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed decreases while the
control switch is turned to SET/COAST, and the ve-
hicle cruises at the set speed when the switch is re-
leased.
N17520 (4) Momentarily pull the control switch downward to
SET/COAST, and then immediately release it.
Check that the vehicle speed decreases by about
1.5 km/h (Tap-down function).

2001 SIENNA (RM787U)

Author : Date : 719
DI-566
DIAGNOSTICS - CRUISE CONTROL SYSTEM

(d) Inspect the CANCEL switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
S Depress the brake pedal
N17520 S Depress the clutch pedal (M/T)
S Shift to except D position (A/T)
S Push the main switch OFF
S Pull the cruise control switch to CANCEL

(e) Inspect the RESUME switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
S Depress the brake pedal
N17520 S Depress the clutch pedal (M/T)
S Shift to except D position (A/T)
S Push the main switch OFF
S Pull the cruise control switch to CANCEL
(4) After the control switch is turned to RES/ACC at the
driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.

2001 SIENNA (RM787U)

Author : Date : 720
DI-567
DIAGNOSTICS - CRUISE CONTROL SYSTEM

(1) 4. INPUT SIGNAL CHECK
HINT:
(1) For check No.1 No.3
S Turn ignition switch ON.
(2) For check No.4
(2)
S Jack up the vehicle.
S Start the engine.
S Shift to D position.
(1) (a) Pull the control switch to SET/COAST or RES/ACC posi-
N17520

tion and hold it down or hold it up "(1)".
(b) Push the main switch ON "(2)".
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.

CRUISE MAIN Indicator LIght Diagnosis
No. Operation Method Blinking Pattern
0.25 sec. 0.25 sec.
ON SET/COAST switch circuit
1 Turn SET/COAST switch ON Light 1sec.
is normal
OFF
ON
2 Turn RES/ACC switch ON Light RES/ACC switch circuit
OFF is normal

Turn CANCEL switch ON CANCEL switch circuit
ON Switch OFF is normal
Light Switch ON
Turn stop light switch ON OFF Stop light switch circuit
3
Depress brake pedal is normal

Turn PNP switch OFF PNP switch circuit is
(Shift to except D position) ON Switch ON normal
Light Switch OFF
Turn clutch switch OFF OFF Clutch switch circuit
(Depress clutch pedal) is normal

Drive at about 40 km/h ON
(25 mph)or higher Light
OFF Vehicle Speed Sensor is
4
ON normal
Drive at about 40 km/h Light
(25 mph) or below OFF

2001 SIENNA (RM787U)

Author : Date : 721

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