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Home >> Toyota >> 2022 >> Corolla XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 444 (Can Communication System (Except HEV) (Early 2023, Except TMC) - Circuit Tests (1 Of 2) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for Gasoline Model except TMC Made) >> Certification ECU Communication Stop Mode [09/2022 - 11/2022] >> Description

Certification ECU Communication Stop Mode [09/2022 - 11/2022]: Description

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
Detection Item Symptom Trouble Area
Certification ECU Communication Stop Mode Any of the following conditions are met:
  • Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the Techstream.

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

  • Communication stop history for "Certification (Smart)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Certification (Smart)" is 6 or more.)

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - 11/2022]

  • Communication system DTCs (DTCs that start with U) that correspond to "Certification ECU Communication Stop Mode" in "DTC Combination Table" are output.

    Refer to DTC COMBINATION TABLE [09/2022 - 11/2022]
  • Certification ECU (smart key ECU assembly) branch line or connector
  • Power source circuit of certification ECU (smart key ECU assembly)
  • Certification ECU (smart key ECU assembly) ground circuit
  • Certification ECU (smart key ECU assembly)
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