On-Vehicle Inspection

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the power supply circuit for the intermediate sensor.
1. Set the battery and battery tray out of the way.
2. Disconnect the intermediate sensor connector
3. Switch the ignition to ON (engine off)
  
  Fig 1: Identifying Intermediate Sensor
  Courtesy of MAZDA MOTORS CORP.
4. Measure the voltage at intermediate sensor connector terminal A (harness-side).
  - If there is any malfunction, repair wiring harness between intermediate sensor and TCM.
    Intermediate sensor specification 4.5-5.5 V
    
    Fig 2: Identifying Input/Turbine Speed Sensor Connector
    Courtesy of MAZDA MOTORS CORP.
5. Switch the ignition to off.
6. Connect the intermediate sensor connector.
Inspect the GND circuit for the intermediate sensor.
1. Switch the ignition to off.
2. Measure the voltage at intermediate sensor connector terminal C (harness-side).
  - If there is any malfunction, repair wiring harness between intermediate sensor and TCM.
    Intermediate sensor specification Below 1.0 V
    
    Fig 3: Identifying Input/Turbine Speed Sensor Connector
    Courtesy of MAZDA MOTORS CORP.
Inspect the signal circuit for the intermediate sensor.
1. Connect the oscilloscope to the following TCM connector terminals and set it as below
  - (+) lead: TCM terminal 2L
  - (-) 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}.
  - If there is any malfunction, replace the intermediate sensor. (See INTERMEDIATE SENSOR REMOVAL/INSTALLATION [FS5A-EL] .)
    
    Fig 4: View Of Waveform Graph
    Courtesy of MAZDA MOTORS CORP.