Which device prevents the vehicle from being started if the transmission is in any drive gear?

Which device prevents the vehicle from being started if the transmission is in any drive gear?

• A. Valve Adjusting Cam
• B. Modulator Valve
• C. Neutral Safety Switch
• D. Transmission Manual Valve

Answer: (C)

The starting interlock idea is that the engine should only crank when the transmission is in a safe gear. The neutral safety switch sits in the starter circuit and completes it only when the shift lever is in Park or Neutral. When the transmission is in any drive gear, that switch opens the circuit, so the starter can’t engage and the vehicle won’t start. The other components—modulator valve, transmission manual valve, and a valve adjusting cam—are related to hydraulic control and valve timing or engine valve operation, not to the starting circuit, so they don’t prevent starting in drive.

The starting interlock idea is that the engine should only crank when the transmission is in a safe gear. The neutral safety switch sits in the starter circuit and completes it only when the shift lever is in Park or Neutral. When the transmission is in any drive gear, that switch opens the circuit, so the starter can’t engage and the vehicle won’t start. The other components—modulator valve, transmission manual valve, and a valve adjusting cam—are related to hydraulic control and valve timing or engine valve operation, not to the starting circuit, so they don’t prevent starting in drive.