Spool valve operation inspection
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
- Remove the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
- Verify that the spool valve in the OCV for hydraulic variable valve timing system is in the maximum valve timing advance position as indicated in the illustration.
- If not as specified, replace the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
- Verify that the battery is fully charged. (See BATTERY INSPECTION (US)
.)
- If not as specified, recharge the battery. (See BATTERY RECHARGING (US)
.)NOTE:
- When applying battery positive voltage between the OCV for hydraulic variable valve timing system 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
- When applying battery positive voltage between the OCV for hydraulic variable valve timing system terminals, the connection can be either of the following:
- If not as specified, recharge the battery. (See BATTERY RECHARGING (US)
.)
- Apply battery positive voltage between the OCV for hydraulic variable valve timing system terminals and verify that the spool valve operates and moves to the maximum valve timing retard position.
- If not as specified, replace the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
- Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing advance position.
- If not as specified, replace the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
- Install the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)