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Check coolant tank level and refill if low. Verify coolant pump is running and pressure gauge shows normal operating pressure (typically 200-300 PSI for TSC systems).

Inspect coolant lines, rotary union, and filters for blockages or kinks. Clean or replace coolant filters if clogged.

Manually activate TSC function (M08 or M88 depending on machine) and verify coolant flows freely from spindle nose. Check for weak or intermittent flow.

Ensure no tool is in spindle and position spindle over coolant tray or suitable container.

Check rotary union seals for wear or damage causing pressure loss. Inspect drawbar area for coolant leaks that would reduce flow to the switch.

Locate the TSC flow switch (typically mounted on spindle head or near rotary union). Check electrical connections for corrosion, looseness, or damage.

With coolant pump running and TSC activated, measure voltage or continuity across flow switch terminals per machine electrical schematic to verify switch operation.

Follow lockout/tagout procedures before accessing electrical connections.

Remove and inspect flow switch for internal debris, corrosion, or mechanical failure. Clean or replace as necessary with OEM-specified part.

Relieve coolant pressure before disconnecting flow switch to prevent coolant spray.

Verify flow switch input signal at spindle drive CN (connector per parameter manual) and check parameter settings for flow monitoring enable/disable and delay times.

Check ladder diagram or I/O display for flow switch input status (typically X address). Verify input state changes when flow switch is manually activated.

Perform continuity test on wiring between flow switch and spindle drive input terminal. Check for opens, shorts to ground, or shorts between wires.

Disconnect power and discharge capacitors before testing. Follow electrical safety procedures.

Inspect cable routing for damage from metal chips, coolant exposure, or mechanical wear. Replace damaged cables with shielded cable to OEM specifications.

If wiring is intact, suspect spindle drive input circuit failure. Contact Fanuc or qualified service provider for drive diagnostics and possible board replacement.