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

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Wave Profile Inspection

1.  Inspect the power supply circuit for the VSS.

(1)  Remove the aerodynamic under cover NO.2. (SeeAERODYNAMIC UNDER COVER NO.2 REMOVAL/INSTALLATION.)

(2)  Disconnect the VSS connector.

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(3)  Switch the ignition to ON.

(4)  Measure the voltage at VSS connector terminal A (wiring harness side).

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

Vehicle speed sensor (VSS) voltage

B+

(5)  Switch the ignition to OFF.

(6)  Connect the VSS connector.

2.  Inspect the GND circuit for the VSS.

(1)  Switch the ignition to OFF.

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

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

Vehicle speed sensor (VSS) voltage

Below 1.0 V

3.  Inspect the signal circuit for the VSS.

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

•  (+) lead: TCM terminal 2P

•  (-) lead: TCM terminal 1P

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

(2)  Start the engine.

(3)  Inspect wave profile when vehicle speed at 30 km/h {20mph}.

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•  If there is any malfunction, perform the Visual Inspection. (SeeVisual Inspection.)

Visual Inspection

1.  Shift the selector lever to N position.

2.  Remove the VSS.

(1)  Disconnect the negative battery cable.

(2)  Remove the aerodynamic under cover NO.2. (SeeAERODYNAMIC UNDER COVER NO.2 REMOVAL/INSTALLATION.)

(3)  Disconnect the VSS connector.

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(4)  Remove the VSS from the transaxle case.

3.  Verify that the sensor is free of any metallic shavings or particles.

•  If there is any malfunction, clean them off.

4.  Inspect sensor rotor surface via VSS installation hole while rotating the front tire manually.

(1)  Is sensor rotor free of damage and cracks?

(2)  Is sensor rotor free of any metallic shavings or particles?

•  If sensor rotor is normal, replace the VSS. (SeeVEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION [FS5A-EL].)

•  If there is any malfunction, clean or replace the sensor rotor.