DTC P0510 - Closed Throttle Position Switch Malfunction: Condition

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.

DTC is set when ECM has not received closed throttle position switch on/off signal while vehicle is operating. Condition must occur at least 10 consecutive times. Possible causes are:

Closed throttle position switch malfunction.
Open or short circuit between terminal "C" on Throttle Position (TP) sensor and terminal No. 3X on Engine Control Module (ECM).
Open or short circuit between terminal "D" on Throttle Position (TP) sensor and terminal No. 3AB on Engine Control Module (ECM).
Throttle position sensor.