LEMON Manuals: Even more car manuals for everyone
Home >> Scion >> 2012 >> tC Automatic Trans >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Engine Immobiliser System (W/O Smart Key) (Diagnostic Codes & Symptom Tests) >> ENGINE IMMOBILIZER SYSTEM (w/o Smart Key System) >> DTC B2793: Transponder Chip Malfunction; DTC B2794: Unmatched Encryption Code; DTC B2797: Communication Malfunction No. 1; DTC B2798: Communication Malfunction No. 2 >> Procedure

DTC B2793: Transponder Chip Malfunction; DTC B2794: Unmatched Encryption Code; DTC B2797: Communication Malfunction No. 1; DTC B2798: Communication Malfunction No. 2: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .

    NEXT: Go to next step 

  2. CHECK FOR DTC 
    1. Check for DTCs using all registered keys. Refer to DTC CHECK / CLEAR .

      HINT: 

      If a DTC is stored, check for DTCs with the next key after clearing the DTCs.

      OK

      DTC B2793, B2974, B2797 or B2798 is not output.

      RESULT

      Result Proceed to
      OK A
      NG (all keys) B
      NG (any key) C

    B → See step   4 

    C → REPLACE KEY THAT CANNOT START ENGINE 

    A → See step   3 

  3. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  4. REPLACE TRANSPONDER KEY ECU ASSEMBLY. Refer to  REMOVAL