Dtc B2793 Transponder Chip Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Theft Deterrent Keyless Entry. Yaris. Ncp93, 131

DESCRIPTION

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

REPLACE TRANSPONDER KEY AMPLIFIER

DTC B2793 Transponder Chip Malfunction

DTC B2794 Unmatched Encryption Code

DTC B2797 Communication Malfunction No. 1

DTC B2798 Communication Malfunction No. 2


DESCRIPTION

  1. DTC B2793 is stored when a malfunction is found in the key during key code registration or a key code is not registered normally. Replace the key if key code registration cannot be performed normally and this DTC is output.
  2. DTC B2794 is stored when a key with an incomplete key code is inserted into the ignition key cylinder.
  3. DTC B2797 is stored when a key with a Bcc malfunction is inserted into the ignition key cylinder.
  4. DTC B2798 is stored when a key is inserted into the ignition key cylinder but a communication error occurs between the key and transponder key ECU assembly.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2793
A transponder chip malfunction (1 trip detection logic*).
  1. Key
  2. Harness or connector
  3. Transponder key amplifier
  4. Transponder key ECU assembly
Insert the key into the ignition key cylinder.
B2794
A key with an incomplete key code is inserted into the ignition key cylinder (1 trip detection logic*).
B2797
A key with a Bcc malfunction is inserted into the ignition key cylinder (1 trip detection logic*).
B2798
Key code identification cannot be completed within the specified time (1 trip detection logic*).
  1. *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Operation When Malfunction Detected
Engine cannot be started
-

Related Data List and Active Test
DTC Code
Data List and Active Test
B2793
Abnormal Status
B2794
Different Encrypt Code
B2797
Bcc Malfunction
B2798
Frame Error

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the key and transponder key ECU assembly, refer to the Registration (YARIS_NCP93 RM00000120Y021X.html).
  2. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CLEAR DTC

  1. Clear the DTCs (YARIS_NCP93 RM000001TCQ01OX.html).


NEXT


2.CHECK FOR DTC

  1. Insert and remove each registered key one at a time, and check for DTCs each time (YARIS_NCP93 RM000001TCQ01OX.html).

    HINT:
    1. Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
    2. If DTC is stored, clear the DTCs before checking the next key.
    OK:
    DTC B2793, B2974, B2797 and B2798 is not output.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (all keys)
    		B
    NG (any key)
    		C


B
Go to step 3

C
REPLACE KEY THAT CANNOT START ENGINE
A

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)

3.CHECK CONNECTION OF CONNECTOR

  1. Check that the connectors are properly connected to the transponder key amplifier.

  1. Check that the engine starts with the key.

    OK:
    Engine starts.


NG
Go to step 4
OK

END (CONNECTOR WAS NOT CONNECTED PROPERLY)

4.REPLACE TRANSPONDER KEY AMPLIFIER

  1. Clear the DTC (YARIS_NCP93 RM000001TCQ01OX.html).

  1. Replace the transponder key amplifier (YARIS_NCP93 RM000003RZI00HX.html).

  1. Check that the engine starts with the key.

    OK:
    Engine starts.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY (YARIS_NCP93 RM000004E7M008X.html)
OK

END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)