Toyota 302U1000.cuw Engine Control Calibration
Learn how Toyota calibration 302U1000.cuw relates to engine control and Corolla service bulletins for P2610 and P2820.
302U1000.cuw is a Toyota engine control module calibration associated with Corolla service bulletins for malfunction indicator light concerns. The engine control module, also called the ECM, manages engine operation and monitors related systems for faults. In vehicles with an electronically controlled transmission, it also participates in transmission control and diagnostics.
The service records identify 302U1000 as a previous calibration. They do not establish that this file contains the corrective changes described in either bulletin.
Service bulletin concerns
Toyota bulletin T-SB-0080-16 addresses an illuminated malfunction indicator light with diagnostic trouble code P2610. This code concerns the ECM’s internal engine-off timer, which tracks the time after the engine is switched off. That timing information can be relevant to diagnostic checks when the vehicle is started again. The bulletin’s revised calibration addresses the documented concern; 302U1000 is listed as a calibration that precedes it.
Toyota bulletin T-TCI-5035 covers a malfunction indicator light with code P2820, a transmission pressure-control solenoid diagnostic code. The solenoid helps regulate hydraulic pressure used in transmission operation. Here too, 302U1000 is listed as a previous calibration, not the updated software discussed by the bulletin.
Vehicle context
T-SB-0080-16 covers 2014–2016 Toyota Corolla models. T-TCI-5035 covers 2014–2017 Corolla models and the 2017 Toyota iM. These are the scope of the respective bulletins, not a guarantee that every listed vehicle uses calibration 302U1000. The calibration identifier is useful when comparing a vehicle’s existing ECM software with the applicable service record.