DTC    B2797    Communication Malfunction No. 1

DTC    B2798    Communication Malfunction No. 2

for Preparation Click here


DESCRIPTION

This DTC is stored when an error occurs in communication between the transponder key amplifier and the transponder key ECU.

HINT:
Some noise is found in the communication line.


DTC No.
DTC Detection Condition
Trouble Area
B2797
B2798
A communication error occurs for about 20 seconds after insertion of a key.
  1. Key
  2. Transponder key amplifier
  3. Transponder key ECU

WIRING DIAGRAM


B164251E13


INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.

1.CHECK KEYS


    B072873E02

  1. Check whether the ignition key being used is near other ignition keys, as shown in the illustration. Also, check whether the key ring is in contact with the key grip.
    Result 
    Result
    		Proceed to
    Key is near other keys and/or key ring is in contact with key grip.
    		A
    Key is not near other keys and key ring is not in contact with key grip.
    		B

    HINT:
    If 2 or more ignition keys are positioned close together or if something that interferes with radio waves, such as a metal object, is on the key ring, then communication noise may occur.



B
Go to step 5
A


2.REMOVE NOISE SOURCE

  1. Separate the keys from each other, or remove the key ring.


NEXT


3.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


4.CHECK FOR DTC

  1. Insert a key into the ignition key cylinder and remove the key.

  1. Check for DTC (Click here).

    OK:
    DTC is not output.



NG
Go to step 5
OK

END 

5.CHECK WHETHER ENGINE STARTS WITH OTHER KEYS

  1. Check if the engine starts with an already registered vehicle key.

    OK:
    Engine starts.



NG
Go to step 6
OK

REPLACE KEY THAT CANNOT START ENGINE 

6.REPLACE TRANSPONDER KEY AMPLIFIER

  1. Replace the transponder key amplifier (Click here).


NEXT


7.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


8.CHECK FOR DTC

  1. Insert a key into the ignition key cylinder and remove the key. Repeat for all the other keys of the vehicle.

  1. Check for DTCs (Click here).

    OK:
    DTC is not output.



NG
REPLACE TRANSPONDER KEY ECU
OK

END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)