Circuit Description
HINT:
This Electronic Throttle Control System (ETCS) does not use a throttle cable.
The throttle position sensor is mounted on the throttle body and it has 2 sensors to detect the throttle opening angle and a malfunction of the throttle position sensor.
The voltage applied to the terminals VTA and VTA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the throttle valve. The VTA is a signal to indicate the actual throttle valve opening angle which is used for the engine control, and the VTA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.
The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to the driving condition.
If this DTCs is stored, the throttle valve is locked at a certain opening angle.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0121 | Difference between VTA1 and VTA2 voltage deviates from malfunction criteria (for 2 seconds) |
|