On-Vehicle Inspection

Inspect the power supply circuit of the intermediate sensor.
1. Disconnect the intermediate sensor connector.
  
  Fig 1: Identifying Intermediate Sensor
  Courtesy of MAZDA MOTORS CORP.
2. Switch the ignition ON.
3. Measure the voltage at intermediate sensor harness-side connector terminal A.
  
  Fig 2: Identifying Intermediate Sensor Harness-Side Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
  - If there is any malfunction in the voltage, repair or replace the power supply circuit wiring harness.
    Voltage
  - B+
4. Switch the ignition OFF.
5. Connect the intermediate sensor connector.
Inspect the intermediate sensor GND circuit.
1. Switch the ignition OFF.
2. Measure the voltage of the intermediate sensor terminal C.
  
  Fig 3: Identifying Intermediate Sensor Harness-Side Connector Terminals
  Courtesy of MAZDA MOTORS CORP.
  - If there is any malfunction in the voltage, repair or replace the GND circuit wiring harness.
    Voltage
  - 1.0 V or less
Inspect the intermediate sensor signal circuit.
1. Connect the oscilloscope tester lead to the TCM and perform the oscilloscope setting.
  - Terminal: TCM AC (+)-GND (-)
  - Oscilloscope setting: 1 V/DIV (Y), 200 μs/DIV (X), DC range
2. Start the engine.
3. When all of the following conditions are met, measure the generated pulse.
  - Vehicle speed: 30 km/h {19 mph}
  - Gear position: 3GR
    
    Fig 4: Vehicle Speed Sensor Waveform
    Courtesy of MAZDA MOTORS CORP.
  - If there is any malfunction in the generated pulse, replace the intermediate sensor. (See INTERMEDIATE SENSOR REMOVAL/INSTALLATION .)