Toyota 30CM1201.cuw Engine Control Firmware
Explore Toyota Tundra calibration 30CM1201 and its service bulletin context for P2440, P2442 and P2610.
30CM1201.cuw is a Toyota Tundra engine control calibration associated with updated software for malfunction indicator light conditions. Its documented service applications involve secondary air injection fault codes P2440 and P2442, as well as engine control module timer code P2610.
Secondary air injection and the check-engine light
The engine control module (ECM) manages engine operation and monitors emissions-related systems. One of those systems is secondary air injection, which introduces fresh air into the exhaust during cold starts to help reduce emissions while the catalysts warm up. The ECM controls and checks the system’s operation.
Toyota service bulletins T-SB-0079-16 and T-TCI-4465 list 30CM1201 as an updated calibration in connection with the malfunction indicator light and codes P2440 and P2442. These codes concern secondary air injection switching valve performance. In practical terms, they can appear when the ECM detects a problem with the way a switching valve operates.
The bulletins cover 2014–2016 Tundra models and 2014–2015 Tundra models respectively. Those ranges describe the bulletins’ scope and do not establish that every vehicle in them uses this exact calibration.
Engine-off timer monitoring
T-SB-0146-16 also lists 30CM1201 as an updated calibration for a 2014 Tundra malfunction indicator light condition involving P2610. This code relates to the ECM’s internal engine-off timer performance. The timer helps the controller track time after the engine is switched off, information used in vehicle monitoring routines.
The service records establish the calibration’s connection to these reported conditions, but they do not describe every software change in the revision. A check-engine light and a stored code also call for diagnosis of the vehicle’s actual condition rather than identifying the calibration alone as the cause.