Pontiac 24225896 Sensor Assembly, Vehicle Speed

To remove and install the front sensor on 1990 vehicles, disconnect the negative battery cable, detach the sensor connector, and raise the vehicle to remove the wheel and tire assembly. For Eldorado and Seville, disengage the sensor cable grommet from the wheel well, remove the sensor cable from brackets, and take out the sensor mounting bolt to remove the sensor. Inspect the sensor face for contaminants and clean as necessary. For installation, coat the sensor with anti-corrosion compound where it contacts the knuckle, install the sensor with the mounting bolt, and secure the cable in retainers, ensuring it is clear of moving parts. Connect the sensor to the wiring harness, reinstall the wheel and tire assembly, and reconnect the negative battery cable. For 1991 Deville and Fleetwood, follow similar steps, ensuring to cut the strap retaining the sensor cable and tighten the mounting bolt to specified torque. For 1992-93 Deville and Fleetwood, disconnect the negative battery cable, detach the sensor connector, and remove the hub and bearing assembly, cleaning the sensor housing area. Pry the slinger from the speed sensor assembly and carefully remove the speed sensor, inspecting for rust or water intrusion. Apply sealant to the bearing hub, install the sensor using a press, and connect the wiring. For 1991 Eldorado and Seville, follow similar removal and installation steps, ensuring to coat the sensor with anti-corrosion compound and secure the cable. For 1992-98 Eldorado and Seville and 1994-98 Deville, the front wheel speed sensors are integrated with the hub and bearing assembly and must be replaced if separated. For the rear sensor on 1990 Deville and Fleetwood, disconnect the negative battery cable, remove side panel carpeting, detach the sensor connector, and raise the vehicle to disconnect the sensor cable. Remove the sensor and inspect for contaminants. For installation, coat the sensor with anti-corrosion compound, secure the cable, and connect the sensor to the harness. For 1990 Eldorado and Seville, follow similar steps, ensuring to inspect the sensor face. For 1991-93 Fleetwood and Deville, remove the hub and bearing assembly, clean the sensor housing, and inspect for wear before installation. For 1992-98 Eldorado and Seville and 1994-98 Deville, note that the rear wheel speed sensor is integral to the rear hub and bearing assembly and cannot be serviced separately.

The Vehicle Speed Sensor (VSS) informs the Powertrain Control Module (PCM) of vehicle speed and controls the Torque Converter Clutch (TCC). For 1992 and earlier models, the VSS is behind the instrument cluster; for 1993 onwards, it's on the transmission's rear extension. For the former, remove the instrument cluster and then the VSS screw. For the latter, raise the vehicle's rear, disconnect the electrical connector, and remove the retaining bolt to extract the sensor. Installation is the reverse, inspecting the O-ring seal and checking transmission fluid levels.

A toothed rotor on the transmission output shaft causes the Vehicle Speed Sensor (VSS), which is a permanent magnet generator mounted on the transmission, to produce an AC voltage. The ECM/PCM uses this signal for different engine and transmission control functions as well as driving the speedometer on the instrument panel. Driveability and transmission problems can result from a defective VSS. To check the VSS operation, raise the vehicle and locate the sensor. Check for any looseness or breaks in terminals and wires and repair if necessary. Back probe the two wire terminals of the VSS connector and connect a voltmeter set on AC volts scale. With ignition key ON, engine OFF, rotate one rear tire while monitoring voltmeter. As minimum as 0.5 volts should be produced by the sensor with increasing speed of rotation of transmission output shaft. Turn off ignition key and disconnect electrical connector from sensor. Measure resistance across two terminals using ohmmeter, which should be approximately 1,000 to 3,000 ohms at 68 degrees F.Temperature If test results are incorrect replace VSS.Replacing means raising vehicle, disconnecting electrical connector, removing mounting bolt then drawing VSS from transmission case.Replace sensor O-ring.Then reinstall VSS back following opposite steps used during removal.

The Vehicle Speed Sensor (VSS) is a permanent magnet generator mounted on the transmission. It is triggered by a toothed rotor on the transmission output shaft. As the output shaft rotates, the sensor produces an AC voltage, the frequency of which is proportional to vehicle speed. The PCM uses the sensor input signal for several different engine, transmission and radio control functions. The VSS signal also drives the speedometer on the instrument panel. A defective VSS can cause various driveability and transmission problems. To replace it, raise the vehicle and support it securely on jackstands. Disconnect the electrical connector from the VSS. Remove the mounting bolt and withdraw the VSS from the transmission case. Replace the sensor O-ring and lubricate it with clean transmission fluid. Installation is the reverse of removal.

The Vehicle Speed Sensor (VSS) informs the Powertrain Control Module (PCM) of vehicle speed and controls the Torque Converter Clutch (TCC). For 1992 and earlier models, the VSS is behind the instrument cluster; for 1993 onwards, it's on the transmission's rear extension. For the former, remove the instrument cluster and then the VSS screw. For the latter, raise the vehicle's rear, disconnect the electrical connector, and remove the retaining bolt to extract the sensor. Installation is the reverse, inspecting the O-ring seal and checking transmission fluid levels.

Clear the PCM of all trouble codes by removing the PCM-B fuse or disconnecting the cable from the negative terminal of the battery for at least 30 seconds.

Yes, the procedure for checking and replacing the output shaft speed sensor is similar to that of the VSS.

After raising the vehicle, the electrical connector should be disconnected from the VSS.

The PCM uses the VSS input signal for several different engine, transmission, and radio control functions.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

Check the level of the transmission fluid and refill it as necessary.

Disconnect the electrical connector and remove the sensor mounting bolt. Place a drain pan underneath the sensor before removing it.

A scan tool is required to access speed sensor data and trouble codes.

On 2WD models, the VSS hold-down bolt should be removed and the VSS should be taken out from the transmission.

After raising the vehicle, the electrical connector should be disconnected from the VSS.

A scan tool is required to access speed sensor data and trouble codes.

When installing the VSS, a new O-ring should be used, even if the old VSS sensor is being reused.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

Yes, the procedure for checking and replacing the output shaft speed sensor is similar to that of the VSS.

This manual covers models with various electric-shift transfer cases and different combinations of speed sensors.

The VSS is triggered by a toothed rotor on the transmission output shaft.

When installing the VSS, a new O-ring should be used, even if the old VSS sensor is being reused.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

The second speed sensor is located at the rear output shaft.

A scan tool is required to access speed sensor data and trouble codes.

To install the VSS, the removal steps should be reversed and the VSS hold-down bolt (2WD models) or the VSS (4WD models) should be tightened securely.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.