Throttle Position Circuit Malfunction

FAULT ID
P0120

TITLE
Throttle Position Circuit Malfunction

BACKGROUND
- The throttle position sensor outputs a voltage which corresponds to the throttle valve opening angle.
- The engine control module checks whether the voltage is within a specified range. In addition, it checks that the voltage output does not become too large while the engine is idling.

RANGE OF CHECK
- Ignition switch: ON
- Excluding 60 seconds after the ignition switch is turned to ON or immediately after the engine starts.

SET CONDITIONS
- When the closed throttle position switch is ON, the sensor output voltage is 2 V or more for 4 seconds.

or

- The sensor output voltage is 0.2 V or less for 4 seconds.

EFFECT
Limp-in
- No increase in fuel injection amount during acceleration due to the unreliable throttle position sensor signal.

PROBABLE CAUSES
- Throttle position sensor failed or maladjusted.
- Open or shorted throttle position sensor circuit, or loose connector.
- Closed throttle position switch ON malfunction.
- Closed throttle position switch signal wire shorted.
- Engine control module failed.