B1207 TOYOTA - Multiplex Communication System
- Faulty Certification ECU
- Certification ECU harness is open or shorted
- Certification ECU circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
B1207 Toyota DescriptionThe Certification ECU communicates with the Transponder Key to verified that the Key has been registered to the vehicle. The Engine Control Module (ECM) sets the ODBII code when communication between the Certification ECU and gateway ECU stops for more than 10 seconds.
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