Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Troubleshooting; Situational Awareness; Time Pressure; Workload
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Issued Advisory / Alert; Flight Crew Executed Go Around / Missed Approach; Flight Crew Diverted
Aircraft; Weather
During the RNAV X 16L approach into RNO; we passed the KNACK approach fix at 6;900 ft.; as depicted; then set 6;200 ft. for WARAX and descended. The weather was IFR and our aircraft was not equipped with vertical guidance for this approach; so we descended quickly to see if we could get below the smoke layer. Reno Tower advised us to check altitude and said that we had a Low Altitude Warning. We double checked the approach charts and our altitude settings and found no error. We continued with the approach with no further Altitude Warning and did not need to adjust our altitude. The approach terminated with a missed approach due to low visibility and a diversion. Possibly a higher descent rate than what would have been suggested by an aircraft equipped with vertical guidance.Possibly a slower rate of descent or a navigation system with vertical guidance and would be very helpful.Upon arriving at LNAV minimums on the RNAV 16L approach into Reno; we were unable to get the runway or runway environment in sight due to smoke and low visibility. We decided to go around at the missed approach point and divert to ZZZ because it did not seem that conditions would improve for a second attempt at a landing. Low visibility; inaccurate meter report.
Air Carrier Captain reported an ATC Low Altitude Warning while on approach into RNO.