Wave Profile Inspection

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Remove the PCM. (See PCM REMOVAL/INSTALLATION .)
Connect WDS or equivalent to DLC-2.
Connect oscilloscope test leads to the following PCM connector terminals.
- (+) lead: PCM terminal 1J
- (-) lead: PCM terminal 1BD
Start the engine.
Monitor VSS PID.
Inspect wave profile.
- PCM terminal: 1J (+)-1BD (-)
- Oscilloscope setting: 1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Vehicle condition: drive the vehicle at 32 km/h {20 mph}
  - -If there is any malfunction, perform the "Open Circuit Inspection" or "Short Circuit Inspection".
Fig 1: Wave Profile Inspection Of Vehicle Speed Sensor
Courtesy of MAZDA MOTORS CORP.