Toyota 302G8100.cuw Engine Control Calibration
Explore Toyota 302G8100.cuw, an engine control calibration associated with P0456 evaporative emissions diagnostics and Corolla and Matrix service bulletins.
302G8100.cuw is a Toyota engine control calibration associated with evaporative emissions diagnostics. Toyota service bulletins identify calibration 302G8100 as an updated calibration in connection with diagnostic trouble code P0456, which indicates a very small leak detected in the evaporative emissions system. The bulletins cover the 2010 Corolla and 2010 Matrix, though that scope does not establish fitment for every vehicle or engine configuration.
How the calibration relates to P0456
The engine control module manages engine operation and monitors emissions equipment. The evaporative emissions system contains fuel vapors rather than allowing them to escape into the atmosphere. Its leak-monitoring function checks the system for problems that could let those vapors escape.
In Toyota Service Bulletin T-SB-0213-09, 302G8100 is listed as an updated calibration for a malfunction indicator light associated with P0456. A second record, T-TCI-3218, also lists it as an updated calibration for P0456. The records connect this calibration with the bulletin remedy, but do not specify the exact monitoring logic changed.
For a driver, P0456 generally means the check-engine light may illuminate because the vehicle has detected a small evaporative-system leak. The code identifies the type of fault detected, not necessarily the component responsible. A technician still needs to diagnose the system rather than assume the calibration alone explains the warning.
Later service context
Toyota Service Bulletin T-SB-0066-10 lists 302G8100 as a previous calibration in a separate malfunction indicator light bulletin involving codes P0031, P0138 and P2195. Those codes concern air-fuel ratio or oxygen sensor monitoring and heater operation. Any change addressing that bulletin belongs to the later revision discussed there, not to 302G8100 itself.
The filename 302G8100.cuw identifies the catalog entry, while 302G8100 is the calibration ID shown in the service records. No stock or modified variant label is supplied for this entry.