Which statements are true regarding the ECU’s interpretation of sensor signals?

Which statements are true regarding the ECU’s interpretation of sensor signals?

• A. The Transmission ECU Converts the Voltage Signal from the VSS into Counts
• B. A TPS Produces an AC Voltage Signal That Rises in Frequency and Amplitude as Speed Increases
• C. Both Statements Are Correct
• D. Neither Statement Is Correct

Answer: (D)

The key idea is how the ECU reads sensors: speed is determined from the timing and frequency of pulses from the VSS, while the TPS provides a steady DC voltage that represents throttle opening, not an AC signal tied to speed. The Transmission ECU doesn’t convert the VSS voltage into discrete counts by interpreting amplitude; it tracks how often pulses occur in a given time to compute speed. The throttle position sensor is a potentiometer that outputs a 0–5V DC signal that changes with throttle position, not an AC signal whose frequency or amplitude increases with speed. So neither statement fits how these sensors are actually used, making “Neither statement is correct” the best choice.

The key idea is how the ECU reads sensors: speed is determined from the timing and frequency of pulses from the VSS, while the TPS provides a steady DC voltage that represents throttle opening, not an AC signal tied to speed. The Transmission ECU doesn’t convert the VSS voltage into discrete counts by interpreting amplitude; it tracks how often pulses occur in a given time to compute speed. The throttle position sensor is a potentiometer that outputs a 0–5V DC signal that changes with throttle position, not an AC signal whose frequency or amplitude increases with speed. So neither statement fits how these sensors are actually used, making “Neither statement is correct” the best choice.