B2797

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2797: Communication Malfunction No. 1

DTC B2797 - Communication Malfunction No. 1

DESCRIPTION

This DTC is output when an error occurs in communication between the transponder key amplifier and the transponder key ECU assembly.
HINT: Some noise is found in the communication line.





WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the transponder key ECU assembly is replaced, register the key and ECU communication ID Engine Immobiliser System (W/O Smart Key System).

PROCEDURE

1. CHECK KEY




(a) 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:






A -- REPLACE TRANSPONDER KEY AMPLIFIER
B -- Continue to next step.
2. CHECK DTC OUTPUT
(a) Separate the keys from each other, or remove the key ring.
(b) Clear the DTCs Engine Immobiliser System (w/o Smart Key System).
(c) Insert a key into the ignition key cylinder and remove the key. Repeat for all the other keys of the vehicle.
OK:
No code is output.
NG -- REPLACE TRANSPONDER KEY AMPLIFIER
OK -- END (KEYS ARE POSITIONED TOO CLOSE TO EACH OTHER)
3. REPLACE TRANSPONDER KEY AMPLIFIER
(a) Replace the transponder key amplifier Removal.
NEXT -- Continue to next step.
4. CHECK ENGINE START
(a) Check that the engine starts.
OK:
The engine starts.
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)