Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA1999NSX V6-3.2L DOHC (VTEC)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSVEHICLE SPEED SENSORDESCRIPTION AND OPERATION
1999 Acura NSX V6-3.2L DOHC (VTEC)
Vehicle Speed Sensor: Description and Operation
1999 Acura NSX V6-3.2L DOHC (VTEC)SECTION Description and Operation
How the Circuit Works
With the ignition switch in ON (II) or START (III), battery voltage is supplied through fuse 5 ('97-'99 models), 02 Heater Relay ('00-'01 models), or Heated Oxygen Sensor Relay ('02-'04 models) and the YEL wire to the vehicle speed sensor (VSS). The sensor is grounded by the BLK wire to G101. The speedometer and other control units in the circuit supply about 5 volts to the ORN wire. The vehicle speed sensor (VSS) intermittently grounds the ORN wire which generates a pulsed signal in it. The number of pulses per minute increases/decreases with the speed of the car.
With the ignition switch in ON (II) or START (III), battery voltage is supplied through fuse 5 ('97-'99 models), 02 Heater Relay ('00-'01 models), or Heated Oxygen Sensor Relay ('02-'04 models) and the YEL wire to the vehicle speed sensor (VSS). The sensor is grounded by the BLK wire to G101. The speedometer and other control units in the circuit supply about 5 volts to the ORN wire. The vehicle speed sensor (VSS) intermittently grounds the ORN wire which generates a pulsed signal in it. The number of pulses per minute increases/decreases with the speed of the car.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.