Toyota Tundra. Manual — part 312

Fig. 2: Identifying Cruise Control System Components Location (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

SYSTEM DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Cruise Control - Tundra

Fig. 3: Cruise Control System Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Communication Table:

COMMUNICATION TABLE

Sender

Receiver

Signal

Line

ECM

Meter ECU

CRUISE main indicator

CAN

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Cruise Control - Tundra

SYSTEM DESCRIPTION

1. CRUISE CONTROL SYSTEM

This system is controlled by the ECM, and is activated by the throttle position sensor and motor. The
ECM controls the following functions: ON-OFF, SET / COAST, RESUME /ACCEL, CANCEL, vehicle
speed operation, motor output control, and overdrive control.



The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle
speed set through the cruise control main switch. The ECM controls the throttle valve motor of the
throttle position sensor and motor to close the valve when the driving speed is less than the stored
speed.



The ECM receives signals such as ON-OFF, SET / COAST, RESUME / ACCEL, and CANCEL
from the cruise control main switch and executes them.



The ECM illuminates the combination meter's CRUISE main indicator light when it receives the
cruise control main switch ON signal.



The ECM cancels the cruise control system when the brake pedal is depressed and the ECM
receives the stop light switch signal.



for 3UR-FE, 3UR-FBE:

The ECM cancels the cruise control system when the shift lever is moved from D (6th, 5th, 4th,
3rd, 2nd or 1st gear) to N, and the ECM receives the PNP switch signal.



for 1GR-FE, 2UZ-FE:

The ECM cancels the cruise control system when the shift lever is moved from D (5th, 4th, 3rd,
2nd or 1st gear) to N, and the ECM receives the PNP switch signal.

2. LIMIT CONTROL

a. Low speed limit

The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The
cruise control system cannot be set when the driving vehicle speed is below the low speed limit.
Cruise control operation will be automatically canceled and the stored vehicle speed will be erased
when the vehicle speed decreases below the low speed limit 40 km/h (25 mph) while the cruise
control is in operation.

b. High speed limit

The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph).
The cruise control system cannot be set when the driving vehicle speed is over the high speed limit.
Also, RESUME / ACCEL cannot be used to increase speed beyond the high speed limit.

3. OPERATION OF CRUISE CONTROL

operation signal

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Cruise Control - Tundra

The cruise control main switch operates 7 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL,
TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and
ACCEL functions are operated with the same switch. The cruise control main switch is an automatic
return type switch which turns on only while operating it in each arrow direction and turns off after
releasing it.

a. SET CONTROL

Vehicle speed is stored and constant speed control is maintained when pushing the switch to SET /
COAST while driving with the cruise control main switch ON (the CRUISE main indicator light is
on), and the vehicle speed is within the set speed range (between the low and high speed limits).

b. COAST CONTROL

When the cruise control main switch is set to SET / COAST and held in that position while the
cruise control system is operating, the ECM sends a "throttle valve opening angle 0°" demand
signal to the cruise control system. Then the vehicle speed, when the cruise control main switch is
released, is stored and maintained.

HINT:

An actual throttle valve opening angle of 0° is not possible due to the idle speed control, etc.

c. TAP-DOWN CONTROL

When tapping down the cruise control main switch to SET / COAST (for approximately 0.6
seconds) while the cruise control system is in operation, the stored vehicle speed decreases each
time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and
stored vehicle speed is more than approximately 5 km/h (3.1 mph), the stored vehicle speed is set to
the actual vehicle speed at the moment the cruise control main switch is released from
SET/COAST and constant speed control is maintained.

d. ACCELERATION CONTROL

The throttle valve motor of the throttle position sensor and motor is instructed by the ECM to open
the throttle valve when RESUME / ACCEL on the cruise control main switch is pressed and held
while the cruise control system is in operation. When the cruise control main switch is released
from RESUME / ACCEL, the vehicle speed is stored and the vehicle is controlled at a constant
speed.

e. TAP-UP CONTROL

When tapping up the cruise control main switch to RESUME / ACCEL (for approximately 0.6
seconds) while the cruise control system is in operation, the stored vehicle speed increases each
time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and
the stored vehicle speed is more than approximately 5 km/h (3.1 mph), the stored vehicle speed will
not be changed.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Cruise Control - Tundra