Description
The throttle actuator is operated by the ecm and opens and closes the throttle valve using gears.
The opening angle of the throttle valve is detected by the throttle position (tp) sensor, which is mounted on the throttle body. The tp sensor provides feedback to the ecm. This feedback allows the ecm to appropriately control the throttle actuator and monitor the throttle opening angle as the ecm responds to driver inputs.
Hint:
This etcs (electronic throttle control system) does not use a throttle cable.
Monitor description
The ecm monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ecm determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ecm determines that there is a malfunction. The ecm then illuminates the mil and sets a dtc.
Example: when the electrical current is less than 0.5 A and the throttle actuator duty ratio exceeds 80 %, the ecm interprets this as the current being outside the standard range, and illuminates the mil and sets a dtc.
If the malfunction is not repaired successfully, a dtc is set when the engine is quickly revved to a high rpm several times after the engine has idled for 5 seconds after engine start.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Fail-safe
When either of these dtcs, or other dtcs relating to etcs (electronic throttle control system) malfunctions, are set, the ecm enters fail-safe mode. During fail-safe mode, the ecm cuts the current to the throttle actuator off, and the throttle valve is returned to a 6° throttle angle by the return spring. The ecm then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal opening angle, to allow the vehicle to continue at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.
Fail-safe mode continues until a pass condition is detected, and the ignition switch is then turned off.
Wiring diagram
Inspection procedure
Hint
Standard resistance
Standard resistance (check for open)
Standard resistance (check for short)
Ok: no foreign objects between throttle valve and housing.
Ok: throttle valve opens and closes smoothly.
Cooling system
On-vehicle inspection
Check cooling system for leaks
Remove the radiator reservoir cap.
Caution:
To avoid the danger of being burned, do not
remove the radiator reservoir cap while the
engine and radiator are still hot. Thermal
expansion will cause hot engine coolant and
steam to b ...
System description
General
The air conditioning system has the following
features:
In accordance with the temperature set using the
temperature control switch, the air conditioning
amplifier determines the outlet temperature
based on the input signals from various sensors.
In addition, corre ...
Trailer towing
Your vehicle is designed primarily as a passenger-and-load-carrying
vehicle. Towing a trailer can have an adverse impact on
handling, performance, braking, durability, and fuel consumption.
For your safety and the safety of others, you must not overload
your vehicle or trailer. You must also e ...