B2797

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: B2797: Communication Malfunction No. 1

DTC B2797 - Communication Malfunction No. 1

DTC B2798 - Communication Malfunction No. 2

DESCRIPTION

This DTC is output when a communication error occurs between the transponder key amplifier and transponder key ECU. Some possible reasons for the communication error are: 1) 2 or more ignition keys are positioned too close together, or 2) noise is occurring in the communication line.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT: When the transponder key ECU is replaced, reregister the ECU - ECM communication ID Engine Immobiliser 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





B -- REPLACE TRANSPONDER KEY AMPLIFIER
A -- Continue to next step.

2. CLEAR DTC
(a) Separate the keys from each other, or remove the key ring.
(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.

3. CHECK FOR DTC
(a) Check that no DTC is output Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPLACE TRANSPONDER KEY AMPLIFIER
OK -- END
4. REPLACE TRANSPONDER KEY AMPLIFIER
(a) Temporarily replace the transponder key amplifier with a new or normally functioning one Removal.
NEXT -- Continue to next step.

5. CLEAR DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
NEXT -- Continue to next step.

6. CHECK DTC
(a) Check for DTC is output Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPLACE TRANSPONDER KEY ECU
OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)