Vehicle Speed Sensor: Testing and Inspection

NOTE: Two types of Vehicle Speed Sensors are used for the Stealth.
Non-turbo model vehicles use a mechanical VSS which is mounted in the rear of the instrument cluster.
Turbo equipped vehicles mount the Electrical VSS on the transmission.

MECHANICAL VSS

1. The Vehicle Speed Sensor (VSS) is mounted on the rear of the instrument panel. Refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES/VSS for procedures in removing the instrument panel.

Mechanical Speedometer Reed Switch Test:

2. Connect an ohmmeter between the reed switch and the reed switch ground.

3. Turn the speedometer shaft using a small screwdriver.
Continuity should exist/not exist several times while the shaft is being rotated.

ELECTRICAL VSS - TURBO

Vehicle Speed Sensor (Electrical Type):

1. Remove the Vehicle Speed Sensor.

Electrical Speed Sensor Test:

2. Connect a voltmeter to terminals # 2 and # 3 of the VSS.

3. Connect the negative lead from the battery to terminal # 2 of the VSS.

4. Connect the positive lead from the battery to a 3-10k ohm resistor and a lead wire from the resistor to terminal # 3 of the VSS.

5. Connect a second lead wire from the positive terminal of the battery to terminal # 1 of the VSS.
As the pulse generator shaft is rotated, voltage should be indicated on the voltmeter 4 times per shaft revolution.

6. If the test results deviate from above, replace the VSS Sensor.