Wave profile Inspection

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.

Remove the PCM. (See POWERTRAIN CONTROL MODULE .)
Connect WDS or equivalent to DLC-2 connector.
Connect the SST (104 Pin Breakout Box) to the PCM as shown.
Connect oscilloscope test leads to the following PCM connector terminals.
- (+) lead: PCM terminal 58
- (-) lead: PCM terminal 103
Start the engine.
Monitor VSS PID.

Fig 1: Identifying PCM And Vehicle Harness
Courtesy of MAZDA MOTORS CORP.
Inspect wave profile.
- PCM terminal: 58 (+)-103(-)
- 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 2: Identifying Blinking Pattern
    Courtesy of MAZDA MOTORS CORP.