DTC B2797 Communication Malfunction No. 1 |
for Preparation Click here
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.DTC No. | DTC Detection Condition | Trouble Area |
B2797 | Keys are positioned too close to each other, or noise occurred in communication line |
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WIRING DIAGRAM
INSPECTION PROCEDURE
1.CHECK KEY |
Check if the ignition key being used is near other ignition keys. Also, check if 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/or key ring is not in contact with key grip B
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A | |
2.CHECK FOR DTC |
Separate the keys from each other and/or remove the key ring.
Delete the DTC (Click here).
Insert a key into the ignition key cylinder. Then remove it. Repeat for all the other keys.
Check that no code is output.
- OK:
- No code is output.
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NG | |
3.CHECK TRANSPONDER KEY ECU |
Using an oscilloscope or the intelligent tester, check for noise in the waveform between the terminals of the T20 amplifier connector and T21 ECU connector.
- OK:
- No noise is present (see illustration).
Tester Connection Tool Setting Condition Specified Condition T21-15 (CODE) - T20-4 (CODE) 5 V/DIV., 20 msec./DIV. Key inserted No noise is present
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OK | |
4.CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) |
Disconnect the T21 ECU connector.
Disconnect the T20 amplifier connector.
Measure the resistance of the wire harness side connectors.
- Standard resistance:
Tester Connection Specified Condition T21-15 (CODE) - T20-4 (CODE) Below 1 Ω
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OK | |
5.CHECK TRANSPONDER KEY AMPLIFIER (OPERATION) |
After replacing the transponder key amplifier with a normally functioning amplifier, check that the engine starts.
- OK:
- Engine starts.
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OK | ||
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