Toyota 30CD6100.cuw Engine Control Calibration

Toyota 30CD6100.cuw is an engine control calibration associated with a service bulletin for a malfunction indicator light. The engine control module uses calibration data to manage engine operation and monitor conditions that can trigger diagnostic trouble codes.

Toyota service bulletin T-SB-0166-19 lists 30CD6100 as an updated calibration. The bulletin addresses a malfunction indicator light associated with codes P0171, P0172, P0174, P0175 or P1604. Its vehicle scope includes the 2009 Toyota Tundra and 2009–2018 Toyota Sequoia, although that list does not establish that this calibration applies to every vehicle covered by the bulletin.

What the diagnostic codes mean

P0171 and P0174 indicate that the monitored air-fuel mixture is too lean on the respective engine banks. P0172 and P0175 indicate a mixture that is too rich. The engine controller monitors fuel delivery and oxygen-sensor feedback to assess those conditions. A lean or rich code can point to a range of issues, so the code alone does not identify a failed part.

P1604 concerns an engine starting condition. In practical terms, it can give a technician a starting point when investigating a reported starting problem or an illuminated warning light. The bulletin places these codes in the context of an updated engine control calibration, but its listing does not establish that every vehicle showing one of them needs the same correction.

How to identify this entry

The complete calibration identifier is 30CD6100, and the catalog filename is 30CD6100.cuw. It is identified in the bulletin as an updated calibration rather than a previous one. The record does not describe a modified variant or assign a separate feature label to this filename.