Spool Valve Operation
- Remove the Oil Control Valve (OCV). See OIL CONTROL VALVE
under VARIABLE VALVE TIMING SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.
- Ensure spool valve (in OCV) is in maximum valve timing retard position. See Fig 1
. If not as specified, replace OCV.
Courtesy of MAZDA MOTORS CORP.
- Ensure battery is fully charged.
- Using fused jumper wires, apply battery voltage between OCV terminals and ensure spool valve moves to maximum valve timing advance position. See Fig 1
. If OCV operation is not as specified, replace OCV.
NOTE:
When applying battery voltage between OCV terminals, connection can be either of 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".
- Disconnect fused jumper wires and verify spool valve returns to maximum valve timing retard position. See Fig 1
. If OCV does not operate as specified, replace OCV.