ENGINE IMMOBILISER SYSTEM (w/o 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 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*). |
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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 Code | Data List and Active Test |
|---|---|
| B2793 | Abnormal Status |
| B2794 | Different Encrypt Code |
| B2797 | Bcc Malfunction |
| B2798 | Frame Error |
INSPECTION PROCEDURE
Note
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When replacing the key and transponder key ECU assembly, refer to the Service Bulletin.
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After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
PROCEDURE
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CLEAR DTC
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Clear the DTCs Click here.
NEXT 
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CHECK FOR DTC
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Insert and remove each registered key one at a time, and check for DTCs each time Click here.
Tech Tips
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Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
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If a DTC is output, clear the DTCs before checking the next key.
OK DTCs B2793, B2974, B2797 and B2798 are not output. Result Result Proceed to OK A NG (all keys) B NG (any key) C -
B 
CHECK CONNECTION OF CONNECTOR Click here
C 
REPLACE KEY THAT CANNOT START ENGINE
A 
USE SIMULATION METHOD TO CHECK Click here
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CHECK CONNECTION OF CONNECTOR
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Check that the connectors are properly connected to the transponder key amplifier.
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Check that the engine starts with the key.
OK Engine starts.
NG
REPLACE TRANSPONDER KEY AMPLIFIER Click here
OK
END (CONNECTOR WAS NOT CONNECTED PROPERLY)
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REPLACE TRANSPONDER KEY AMPLIFIER
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Clear the DTCs. Click here.
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Replace the transponder key amplifier Click here.
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Check that the engine starts with the key.
OK Engine starts.
NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK
END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)
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