B2797

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2797: Communication Malfunction No. 1

DTC B2797 - Communication Malfunction No. 1

DESCRIPTION

This DTC is output when an error occurs in normal communication.
HINT: Some noise found in the communication line.





WIRING DIAGRAM





INSPECTION PROCEDURE

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 -- CHECK TRANSPONDER KEY AMPLIFIER
A -- Continue to next step.
2. CHECK DTC OUTPUT
(a) Delete the DTC .
(b) Insert the key into the ignition key cylinder.
(c) Check that no code is output.
OK:
No DTC is output.
OK -- END
NG -- Continue to next step.
3. CHECK TRANSPONDER KEY AMPLIFIER





(a) Using an oscilloscope or Techstream, check the waveform between the terminals of the I14 amplifier and T6 ECU connector.
Check that no noise is included in the waveform (an example of noise is shown on the left).
(b) Check that no noise is included in the waveform (an example of noise is shown on the left).
Result:










NG -- FIND CAUSE OF NOISE AND REMOVE IT
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)





(a) Disconnect the T6 ECU and I14 amplifier connectors.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. REPLACE TRANSPONDER KEY AMPLIFIER
(a) After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the engine starts.
OK:
The engine starts
NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)