Federal Military Parts (763) 310-9340
Throttle Position Sensor (TPS) for Military HUMVEE 6.5L HMMWV 12554488
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31.900 DJF
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31.900 DJF
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For the mechanical-injection 6.5L diesel HMMWV (M998, M1025, M1038, M1097, M1123, etc.), the Throttle Position Sensor (TPS) mounted on the injector pump typically uses:
| Description | Part Number | NSN |
|---|---|---|
| Throttle Position Sensor (TPS) | 12554488 | 2990-01-426-4425 |
| Alternate manufacturer number | GEP18002829 | 2990-01-426-4425 |
The TPS is mounted on the side of the injection pump and sends a variable voltage signal (approximately 0.5V to 4.5V) to the transmission controller for shift timing and torque converter operation.
The Throttle Position Sensor (TPS) part #12554488 is an electronic rotary potentiometer used on military HMMWVs (Humvees) to convert throttle lever movement into a variable voltage signal.
What Does It Do?
On a military Humvee equipped with a mechanically injected GM/GEP 6.5L diesel engine (DB2 mechanical injection pump), engine fueling is controlled mechanically via the throttle linkage. Because the engine does not rely on a computerized engine control module (ECM) for fuel injection, the TPS is primarily used to provide engine load data to the Transmission Control Module (TCM).
Which Vehicles Use It? (Is It on Every Humvee?)
No, it is not used on every military Humvee.
- GM Part #: 12554488
- AM General Part #: 5714530
- NSN (National Stock Number): 2990-01-426-4425 [1]
How Do You Know When It Needs to Be Replaced?
Because the TPS directly governs transmission behavior, symptoms of a failing or miscalibrated sensor show up in how the vehicle shifts and drives
Harsh or Erratic Shifting: The transmission may bang into gear abruptly, shift up or down unexpectedly, or refuse to shift at the correct RPM.
Transmission Limp Mode: A failed signal will cause the TCM to default to a failsafe "limp mode," locking the transmission into 2nd gear with maximum line pressure.
