Spool Valve Operation Inspection

Verify that the spool valve in the OCV is in the maximum valve timing advance position as indicated in the figure.
- If there is any malfunction, replace the OCV.
NOTE:
- When applying battery positive voltage between the OCV terminals, the connection can be either of the following:
  - Positive battery cable to terminal A, negative battery cable to terminal B
  - Positive battery cable to terminal B, negative battery cable to terminal A
Fig 1: Identifying Spool Valve (Maximum Valve Timing Advance Position)
Courtesy of MAZDA MOTORS CORP.
Apply battery positive voltage between the OCV terminals and verify that the spool valve operates and moves to the maximum valve timing retard position.

Fig 2: Identifying Oil Control Valve Terminals A And B
Courtesy of MAZDA MOTORS CORP.
- If there is any malfunction, replace the OCV.
Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing advance position.
- If there is any malfunction, replace the OCV.
  
  Fig 3: Identifying Spool Valve Returns To Maximum Valve Timing Advance Position
  Courtesy of MAZDA MOTORS CORP.