5010162BXW | Genuine Paccar® Electronic Throttle Control Assembly

1. Control Fuel Injection

When you press the gas pedal:

• The throttle opens.

• The sensor reports the throttle position.

• The Engine Control Module (ECM) adjusts how much fuel to inject.

This keeps the air-fuel mixture correct.

2. Regulate Engine Power

The sensor helps the ECM:

• Increase RPM when accelerating

• Maintain idle speed

• Reduce power when needed

Without it, the engine wouldn’t know how much power you’re requesting.

3. Support Transmission Shifting

In automatic vehicles, the TPS signal helps determine:

• Shift timing

• Downshifting during acceleration

4. Enable Electronic Throttle (Drive-by-Wire)

In modern vehicles from manufacturers like Toyota, Ford, and BMW:

• The accelerator pedal has a position sensor.

• The throttle body has position sensors.

• The computer compares signals for safety and accuracy.

This allows:

• Traction control

• Cruise control

• Stability control

• Better fuel efficiency

1. Check Engine Light

Very common.
Typical codes:

• P0120

• P0121

• P0122

• P0123

2. Hesitation or Jerking When Accelerating

• Press gas → delay in response

• Sudden surge of power

• Jerky acceleration

This happens when the sensor sends inconsistent voltage signals.

3. Rough or Unstable Idle

• RPM goes up and down

• Engine feels like it might stall

4. Stalling

• May stall when coming to a stop

• May stall when shifting into gear

5. Reduced Engine Power / Limp Mode

Modern electronic throttle systems may limit power for safety.

6. Poor Fuel Economy

Incorrect throttle readings = wrong fuel delivery.

7. Hard Shifting (Automatic Transmission)

The transmission relies on throttle position data to determine shift timing.