1. Install the pump (see subsection "Final engine assembly" section "Cylinder block").
2. Install the oil pan, oil pickup, oil damper and gasket.
3. (2C, 2C-T, 3S-FE, 3S-GE, 4S-FE, 5E-FE) Install the oil pump sprocket.
4. Install the dipstick and guide.
5. Install the timing belt. See section "timing belt" subsection "Timing belt installation".
6. Fill the system with oil.
7. Start the engine and check for oil leakage.
8. Check the oil level.