ENGINE IMMOBILISER SYSTEM (w/o Smart Entry and Start System), Diagnostic DTC:B2793, B2794, B2797, B2798
| DTC Code | DTC Name |
|---|---|
| B2793 | Transponder Chip Malfunction |
| B2794 | Unmatched Encryption Code |
| B2797 | Communication Malfunction No. 1 |
| B2798 | Communication Malfunction No. 2 |
DESCRIPTION
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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.
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DTC B2794 is stored when a key with an incomplete key code is inserted into the ignition key cylinder.
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DTC B2797 is stored when a key with a BCC malfunction is inserted into the ignition key cylinder.
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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*). |
|
Insert the door control transmitter assembly into the ignition key cylinder, turn the ignition switch from off to ON and wait at least 20 seconds. |
| B2794 | A door control transmitter assembly with an incomplete key ID code is used to turn the ignition switch to ON (1 trip detection logic*). | ||
| B2797 | A door control transmitter assembly with a BCC malfunction is used to turn the ignition switch to ON (1 trip detection logic*). | ||
| B2798 | Key ID code identification cannot be completed within the specified time (1 trip detection logic*). |
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*: Only output while a malfunction is present.
| Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
|---|---|
| Engine cannot be started | - |
| DTC No. | Data List and Active Test |
|---|---|
| B2793 | - |
| B2794 | - |
| B2797 | - |
| B2798 | - |
INSPECTION PROCEDURE
Note
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If the transponder key ECU assembly or key is replaced, refer to Service Bulletin.
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After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
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CLEAR DTC
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Clear the DTCs Click here.
NEXT 
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CHECK DTC OUTPUT
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Perform "DTC Output Confirmation Operation" procedure.
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Check for DTCs Click here.
Tech Tips
If DTC B2793, B2794, B2797, or B2798 is stored, clear the DTCs before checking the next door control transmitter assembly.
OK DTC B2793, B2974, B2797 and B2798 are not output. Result Result Proceed to DTCs are output for all of the door control transmitter assemblies A DTCs are output for any of the door control transmitter assemblies B DTCs are not output C
B 
REPLACE DOOR CONTROL TRANSMITTER ASSEMBLY THAT DTC IS OUTPUT
C
USE SIMULATION METHOD TO CHECK Click here
A
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CHECK CONNECTION OF CONNECTOR
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Check that the connector is properly connected to the transponder key coil.
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Check that the engine starts with the door control transmitter assembly.
OK Engine starts normally.
NG 
REPLACE TRANSPONDER KEY COIL Click here
OK 
END (CONNECTOR WAS NOT CONNECTED PROPERLY)
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REPLACE TRANSPONDER KEY COIL
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Clear the DTCs Click here.
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Replace the transponder key coil Click here.
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Check that the engine starts with the door control transmitter assembly.
OK Engine starts normally.
NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK
END (TRANSPONDER KEY COIL WAS DEFECTIVE)
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