Wave Profile Inspection

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove the TCM. (See TCM REMOVAL/INSTALLATION .)
Connect WDS or equivalent to DLC connector.
Connect oscilloscope test leads to the following TCM connector terminals.
- (+) lead: TCM terminal 2P
- (-) lead: TCM terminal 1O
Start the engine.
Monitor VSS PID.
Inspect wave profile.
- TCM terminal: 2P (+)-1O (-)
- Oscilloscope setting: 1 V/DIV (Y), 2.5 ms/DIV (X), DC range
- Vehicle condition: drive the vehicle with 32 km/h {20 mph}
  - If wave profile or voltage are out of specifications, carry out the "Open Circuit Inspection" or "Short Circuit Inspection"
    
    Fig 1: Identifying Wave Pattern
    Courtesy of MAZDA MOTORS CORP.