Fuel Injection Pump Lever and Throttle Position Sensor

Description: On gasoline engines, the Throttle Position Sensor is a potentiometer mounted on the throttle body. The TPS detects the position of the throttle plate and sends this information to the processor assembly (12A650) as a varying voltage signal.

On diesel engines, the Fuel Injection Pump Lever Sensor is a potentiometer attached to the fuel injection pump. It is operated by the throttle lever and sends a varying voltage signal to the processor assembly (12B565). The processor can then determine how much fuel is being delivered to the engine.

If a malfunction occurs in the FIPL/TPS circuit, the ECA processor will recognize that the FIPL/TPS sensor signal is out of specification. The processor will then operate the E40D transmission in a high capacity mode to prevent transmission damage. This high capacity mode causes harsh upshifts and engagements, a signal or warning that transmission diagnosis is required.

The FIPL sensor is preset to a gage block specification. To check or re-adjust, see the Engine/Emission Diagnostic Shop Manual Pinpoint Test DQ.


Transmission function: Shift scheduling and TV pressure control

Symptoms: Harsh engagements, firm shift feel, abnormal shift schedule, converter clutch does not engage

Self test codes: 23, 53, 63, 73