Williams Controls 131040 electronic throttle position sensor (TPS) for Cummins ISX and pre-1998 mechanical-pedal Cummins engines. Sensor only — this is the replacement potentiometer that bolts onto the existing accelerator pedal assembly, not a complete pedal. Williams Controls has superseded this part with 131973 (improved durability and electrical interface), but the 131040 remains the correct fitment for original installations.Signs You Need a New Throttle Position Sensor Erratic idle, surging, or sudden loss of throttle response Engine ECM throwing TPS-related fault codes (open circuit, signal out of range) Pedal feels normal but the engine does not respond to pedal input Cruise control drops out unexpectedly Specifications Manufacturer Williams Controls Part Number 131040 Part Type Throttle Position Sensor (sensor only) Engine Compatibility Cummins ISX; pre-1998 mechanical-pedal Cummins (e.g. 351375, 351376, 351377 pedal assemblies) Function Potentiometric pedal-position sensor for ECM throttle input Supersession Superseded by Williams Controls 131973 Cross ReferencesThis part replaces or is equivalent to the following part numbers: Williams Controls (current supersession): 131973 Also known as: A129863 ApplicationsThis throttle position sensor fits the following accelerator pedal assemblies: Williams Controls 351375, 351376, 351377 pedal assemblies (pre-1998 Cummins) Williams Controls 340000 sensor-kit applications Cummins ISX original-equipment Williams pedal assemblies Representative vehicles using these pedal assemblies include Class 8 trucks built with Cummins ISX or pre-1998 Cummins on-highway engines (Freightliner, Kenworth, Peterbilt, International, Volvo, Mack).Sensor only — if the pedal assembly itself is worn or the harness is damaged, replace the complete pedal kit (e.g. Williams Controls 131973 / 134168) instead. Verify your existing pedal model number before ordering.
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