Where is the Throttle Position Sensor located in a 1999 24 valve cummins turbo diesel?

The Throttle Position Sensor (TPS) on a 1999 24-valve Cummins turbo diesel is not directly on the throttle body. Unlike gasoline engines, these engines use an electronic governor system and don't have a traditional throttle body in the same sense.

Instead, the equivalent sensor is integrated into the Electronic Control Module (ECM)'s input system. Information about engine speed and fuel demand comes from various sensors, including the Accelerator Pedal Position Sensor (APPS) which is typically found on the accelerator pedal assembly itself. The ECM then controls fuel delivery based on this and other sensor data. There isn't a single component directly analogous to the TPS found on gasoline engines.