Toyota Tundra 2005 Service - Repair - Maintenance page 4103

Cruise Control (Double Cab)
System Outline
The cruise control system is a constant vehicle speed controller which controls the opening angle of the engine throttle valve
by the SW, and allows driving at a constant speed without depressing the accelerator pedal.
1. Set Control
When the - SET SW is operated while traveling with the ON-OFF SW on, the speed when the - SET SW is operated to off
is memorized, and the vehicle speed is controlled at that speed.
2. Coast Control
When the - SET SW is operated to on, the cruise control opening angle requirement is turned to 0 to decrease the vehicle
speed, and the speed when the - SET SW is operated to off is memorized, and the vehicle speed is controlled at that speed.
Furthermore, every time the - SET SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehicle speed is
decreased by approx. 1.6 km/h (1.0 mph).
3. Accel Control
When the + RES SW is operated to on, the throttle motor rotates the throttle valve to open direction to increase the vehicle
speed, and the speed when the + RES SW is operated to off is memorized, and the vehicle speed is controlled at that
speed.
Furthermore, every time the + RES SW is operated momentarily (Approx. 0.5 sec.) to on, the memorized vehicle speed is
increased by approx. 1.6 km/h (1.0 mph).
4. Manual Cancel Mechanism
If any of the following signals are input during cruise control traveling, the current to the motor flows in the direction to close
the throttle valve, and cancel the cruise control.
(1) Stop lamp SW is on (Brake pedal is depressed)
(2) The CANCEL SW of the control SW is on
(3) ON-OFF SW is off
(4) Gear is shifted from D position to other positions than D.
5. Resume Control
After canceling the cruise control (Except when the ON-OFF SW is off) if the vehicle speed is above the minimum speed
limit (Approx. 40km/h, 25mph), operating the + RES SW to on from off will cause the system to accelerate and resume to the
vehicle speed before manual cancellation.
6. Overdrive Function
The overdrive may be cut on an uphill grade, while traveling with the cruise control.
After the overdrive is cut, when the throttle opening information indicates the hill climbing is finished after the overdrive is
canceled, the vehicle returns to overdrive mode again as the overdrive return timer is completed, and if the system
determines that the uphill grade has finished, the overdrive will resume after the overdrive timer operation.
7. Auto Cancel Operation
If any of the following conditions are detected, the control is canceled.
(1) Disconnection and/or short in the stop light SW
(2) Malfunction in the vehicle speed signal
(3) Malfunction in the electronic throttle parts
(4) Malfunction in the stop light SW input circuit
(5) Malfunction in the cancel circuit
(6) When the vehicle speed gets slower than the low speed limit.
(7) The actual vehicle speed becomes -16 km/h (10 mph) slower than the set speed
Service Hints
E3 (A), E4 (B), E5 (C), E7 (E) Engine Control Module
IGSW-E1 : 9.0-14.0 volts with ignition SW at ON or ST position
BATT-E1 : Always 9.0-14.0 volts
STP-E1 : 9.0-14.0 volts with brake pedal depressed
: Below 1.5 volts with brake pedal released
C16 Combination SW
5-4 : Approx. 1540Ω with CANCEL SW on
Approx. 240Ω with + RES SW on
Approx. 630Ω with - SET SW on
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2005 TOYOTA TUNDRA (EWD611U)