VEHICLE SPEED SENSOR (VSS) INSPECTION [FS5A-EL]

On-Vehicle Inspection

1. Inspect the power supply circuit for the VSS.
a. Remove the under cover.

b. Disconnect the VSS connector.

c. Turn the ignition switch to the ON position.

d. Measure the voltage at VSS connector terminal A (harness-side).

- If there is any malfunction, repair wiring harness between VSS and TCM.

VSS specification
- 4.5-5.5 V

e. Turn the ignition switch off.

f. Connect the VSS connector.

2. Inspect the GND circuit for the VSS.
a. Turn the ignition switch off.

b. Measure the voltage at VSS sensor connector terminal C (harness-side).

- If there is any malfunction, repair wiring harness between VSS sensor and TCM.

VSS sensor specification
- Below 1.0 V

3. Inspect the signal circuit for the VSS.
a. Connect the oscilloscope to the following TCM connector terminals and set it as below.

- (+) lead: TCM terminal 2P
- (-) lead: battery negative terminal
- Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), DC range

b. Start the engine.

c. Measure the wave form when vehicle speed at 30 km/h {19 mph}.

- If there is any malfunction, replace the VSS. Service and Repair

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.

Safety Warning

Vehicle Speed Sensor: Testing and Inspection

Use the Manual With the Right Hardware

When to See a Mechanic

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