P0510

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 IDL1 of the Engine Control Module (ECM) becomes 0.0 volts. At this time, a voltage of 0.3 - 0.8 volts is applied to terminal VTA1 of the ECM. When the throttle valve is opened, the IDL contacts go off and thus the power source voltage of approximately 12 volts in the ECM is applied to the terminal IDL1 of the ECM. The voltage applied to the terminal VTA1 of the ECM increases in proportion to the opening angle of the throttle valve and becomes 3.2 - 4.9 volts when the throttle valve is fully opened. The ECM judges the vehicle driving conditions from these signals input from terminals VTA1 and IDL1, and uses them as one of the conditions for deciding the air-fuel ratio correction, power increase correction and fuel-cut control etc.




HINT: After confirming DTC PO51O use the LEXUS hand-held tester to confirm the closed throttle position switch signal from CURRENT DATA.





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: If DTCs PO110, PO115 and PO120 are output simultaneously, E2 (Sensor ground) may be open.

LEXUS Hand Held Tester








OBD II scan tool (excluding LEXUS hand-held tester)