VEHICLE SPEED SENSOR (VSS) INSPECTION [FN4A-EL]

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On-Vehicle Inspection

1.  Inspect the power supply circuit for the VSS.

(1)  Disconnect the VSS connector.

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(2)  Switch the ignition to ON (engine off).

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

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•  If there is any malfunction, repair wiring harness between main relay and VSS.

VSS specification

B+

(4)  Switch the ignition to off.

(5)  Connect the VSS connector.

2.  Inspect the GND circuit for the VSS.

(1)  Switch the ignition to off.

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

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•  If there is any malfunction, repair wiring harness between VSS sensor and GND.

VSS specification

Below 1.0 V

3.  Inspect the signal circuit for the VSS.

(1)  Connect the oscilloscope to the following PCM connector terminals and set it as below.

•  (+) lead: PCM terminal 1AX

•  (-) lead: battery negative terminal

•  Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), DC range

(2)  Start the engine.

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

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•  If there is any malfunction, replace the VSS. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [FN4A-EL].)