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Description
The idling speed is controlled by the etcs (electronic throttle control system). The etcs is comprised of: 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position (tp) sensor, which detects the opening angle of the throttle valve; 4) the accelerator pedal position (app) sensor, which detects the accelerator pedal position; and 5) the ecm, which controls the etcs. Based on the target idling speed, the ecm controls the throttle actuator to provide the proper throttle valve opening angle.

Monitor description
The ecm monitors the idling speed and idling air flow volume to conduct idle speed control (isc). The ecm determines that the isc system is malfunctioning if the following conditions apply:
Example: if the actual idling speed varies from the target idling speed by more than 200 rpm* 5 times during a drive cycle, the ecm illuminates the mil and sets the dtc.
Hint:
*: Threshold idling speed varies with engine load.

Monitor strategy

Typical enabling conditions
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Typical malfunction thresholds

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Inspection procedure
Hint:

Hint:
If any dtcs other than p0505 are output, troubleshoot those dtcs first.

Ok: pcv hose is connected correctly and is not damaged.

Ok:
no leakage from air induction system.

Ok: throttle valve is not contamainated with foreign objects and moves smoothly.

Brake switch "A" / "B" correlation
Cold startSteering angle sensor zero point malfunction
Description
The skid control ecu learns the steering sensor zero point every time the
ignition switch is turned on and
the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds.
The ecu also stores the
previous zero point.
If front wheel alignment or the steering wh ...
Pressure control solenoid "d" electrical (shift solenoid valve slt)
Description
Refer to dtc p2714 (see page ax-91).
Monitor description
When an open or short in the shift solenoid valve slt circuit is detected,
the ecm interprets this as a fault.
The ecm will illuminate the mil and store the dtc.
Monitor strategy
Typical enabling conditions
...
If a warning light turns on or
a warning buzzer sounds
Calmly perform the following actions if any of the warning
lights comes on or flashes. If a light comes on or flashes, but
then goes off, this does not necessarily indicate a malfunction
in the system. However, if this continues to occur, have
the vehicle inspected by your Toyota dealer.
Actions to ...