P0510

DTC P0510 Closed Throttle Position Switch Malfunction





CIRCUIT DESCRIPTION
The throttle position sensor is mounted in the throttle body and detects the throttle valve opening angle. When the throttle valve is fully closed, the IDL contacts in the throttle position sensor are on, so the voltage at the terminal IDL of the ECM becomes 0 V. At this time, a voltage of approximately 0.7 V is applied to terminal VTA of the ECM. When the throttle valve is opened, the IDL contacts go off and thus the power source voltage of approximately 12 V in the ECM is applied to the terminal IDL of the ECM. The voltage applied to the terminal VTA of the ECM increases in proportion to the opening angle of the throttle valve and becomes approximately 2.7 - 5.2 V when the throttle valve is fully opened. The ECM judges the vehicle driving conditions from these signals input from terminals VTA and IDL, and uses them as one of the conditions for deciding the air-fuel ratio correction, power increase correction and fuel-cut control etc.





DETECTING CONDITION AND TROUBLE AREA





HINT: After confirming DTC P0510 use the TOYOTA hand-held tester to confirm the closed throttle position switch signal from "CURRENT DATA"





WIRING DIAGRAM

*Closed Throttle Position Switch

INSPECTION PROCEDURE

HINT: If DTC "P0110" (intake air temp. circuit malfunction), "P0115" (engine coolant temp. circuit malfunction) and "P0120" (throttle/pedal position sensor/switch "A" circuit malfunction) are out put simultaneously, E2 (sensor ground) may be open.








TOYOTA hand-held tester








OBD II scan tool