Toyota 30CM1200.cuw Firmware: Tundra Engine Control Calibration

30CM1200.cuw is a Toyota Tundra engine control calibration associated with diagnostics for the secondary air injection system and the engine-off timer. Toyota service bulletins identify calibration 30CM1200 as an updated calibration for certain Tundra applications.

The engine control module manages engine operation and monitors emissions-related systems. During cold starting, the secondary air injection system supplies fresh air to the exhaust to help reduce emissions while the catalytic converters warm up. The controller monitors that system and can illuminate the malfunction indicator light, also called the check engine light, when it detects a fault.

Secondary air injection diagnostics

Toyota service bulletins T-SB-0079-16 and T-TCI-4465 list 30CM1200 as an updated calibration in connection with diagnostic trouble codes P2440 and P2442. These codes concern secondary air injection switching valves detected as stuck open. The bulletins address a malfunction indicator light condition, making the calibration relevant to diagnosis of that warning and the associated air injection system.

T-SB-0079-16 covers 2014 through 2016 Tundra models, while T-TCI-4465 covers 2014 and 2015 Tundra models. Those model years describe the scope of each bulletin, not confirmed fitment of 30CM1200 to every vehicle listed.

Engine-off timer monitoring

T-SB-0146-16 also identifies 30CM1200 as an updated calibration for a 2014 Tundra bulletin involving code P2610 and the malfunction indicator light. P2610 relates to the engine control module's engine-off timer performance. The timer tracks how long the engine has been off, information the controller can use when running onboard diagnostic checks.

The bulletins establish the conditions associated with the updated calibration. They do not establish that every Tundra with these codes needs this exact calibration, or that a software revision alone resolves every underlying fault.