On-Vehicle Inspection

WARNING: This page is about a different variant/trim than selected.

Inspect the power supply circuit for the VSS.
1. Remove the aerodynamic under cover NO. 2. (See AERODYNAMIC UNDER COVER NO. 2 REMOVAL/INSTALLATION .)
2. Disconnect the VSS connector.
3. Switch the ignition to ON (engine off).
  
  Fig 1: VSS Connector
  Courtesy of MAZDA MOTORS CORP.
4. Measure the voltage at VSS connector terminal A (harness-side).
  - If there is any malfunction, repair wiring harness between VSS and TCM.
  VSS specification B+
5. Switch the ignition to off (LOCK).
6. Connect the VSS connector.
  
  Fig 2: VSS Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
Inspect the GND circuit for the VSS.
1. Switch the ignition to off.
2. Measure the voltage at VSS connector terminal C (harness-side).
  - If there is any malfunction, repair wiring harness between VSS and TCM.
  VSS specification Below 1.0 V
  
  Fig 3: VSS Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
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: 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 the following conditions are met
  - Vehicle speed: 30 km/h {19 mph}
  - Gear position: 3 GR
    - If there is any malfunction, replace the VSS. (See VEHICLE SPEED SENSOR (VSS) REMOVAL/INSTALLATION .)
      
      Fig 4: VSS Oscilloscope Graph
      Courtesy of MAZDA MOTORS CORP.