How is the VSS sensor used in the PCM?
OPERATION The Vehicle Speed (VSS) Sensor input is used by the PCM to determine vehicle speed. The VSS generates a signal that increases in frequency proportionate to vehicle speed. The PCM has a base frequency stored in memory for a distance of one mile.
What can change the speed of a VSS sensor?
Modified drivetrain components such as final gear sets and/or tires can alter VSS input values to the PCM. Improper signals can alter Torque Converter Clutch (TCC) application, shift points, cruise control operation as well as many other systems relying on vehicle speed input.
What are the different types of speed sensors?
VSS types include: photo-optic, permanent magnet generators(The Vehicle Speed Sensor (VSS) is a magnetic pick-up that sends a signal to the Powertrain Control Module (PCM).) or hall effect technology. The PCM may use other sensors on the vehicle (ABS Wheel Speed) to validate VSS operation.
Where is the speed sensor on a car?
VSS gives the onboard computer information about the vehicle speed. The sensor operates on the principle of the Hall Effect and is usually mounted on the tachometer or in the gearbox. Fig. 1 shows typical speed sensors.
How does the vehicle speed sensor ( VSS ) work?
The Vehicle Speed Sensor (VSS) is a magnetic pick-up that sends a signal to the Powertrain Control Module (PCM). VSS – Vehicle Speed Sensor Vehicle Speed Sensor (VSS) OPERATION The Vehicle Speed (VSS) Sensor input is used by the PCM to determine vehicle speed. The VSS generates a signal that increases in frequency proportionate to vehicle speed.
OPERATION The Vehicle Speed (VSS) Sensor input is used by the PCM to determine vehicle speed. The VSS generates a signal that increases in frequency proportionate to vehicle speed. The PCM has a base frequency stored in memory for a distance of one mile.
How to test the resistance of the VSS sensor?
1 Turn the ignition switch to the OFF position. 2 Disengage the wiring harness connector from the VSS. 3 Using a Digital Volt-Ohmmeter (DVOM), measure the resistance (ohmmeter function) between the sensor terminals. If the resistance is 190–250 ohms, the sensor is okay.
What are the symptoms of a speed sensor?
Vehicle Speed Sensor Symptoms Overheated transmission Increased emissions Poor fuel economy Stalling on deceleration Improper shift points Cruise control inoperative Vehicle Speed Sensor Testing Turn the ignition switch to theOFFposition. Disengage the wiring harness connector from the VSS.