Toyota 1 MZ–FE Manual page 546

EG2–546
DTC P0510 Closed Throttle Position Switch Malfunction
CIRCUIT DESCRIPTION
Refer to throttle Position Circuit on page EG2–463.
DTC No. Diagnostic Trouble Code Detecting Condition
The closed throttle position switch does not turn ON
even once when the vehicle is driven,
P0510
(2 trip detection logic)
HINT: After confirming DTC P0510 use the TOYOTA hand–held tester to confirm the closed throttle
position switch signal from "CURRENT DATA".
Throttle Valve
Fully Closed
Fully Open
WIRING DIAGRAM
1MZ–FE ENGINE
Closed throttle position
switch signal
OFF
– CIRCUIT INSPECTION
Trouble Area
Open in closed throttle position switch circuit.
Closed throttle position switch.
ECM
Malfunction
Open Circuit
Short Circuit