Engine Immobiliser System (from 12/2010)

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

DESCRIPTION

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK KEYS

(a) Check if the ignition key being used is near other ignition keys, as shown in the illustration. Also, check if the key ring is in contact with the key grip.





Result:





B -- CHECK TRANSPONDER KEY ECU ASSEMBLY
A -- Continue to next step.

2. CHECK DTC OUTPUT

(a) Separate the keys from each other. Or, remove the key ring.

(b) Delete the DTC DTC Check / Clear (from 12/2010).

(c) Insert a key into the ignition cylinder. Remove it. Repeat for all the other keys.

(d) Check that no code output.

NG -- CHECK TRANSPONDER KEY ECU ASSEMBLY

OK -- END

3. CHECK TRANSPONDER KEY ECU ASSEMBLY

(a) Using an oscilloscope or Techstream, check the waveform between the terminals of D32 amplifier connector and D33 ECU connector. The waveform should be similar to the illustration on the left.





Result:









NG -- FIND CAUSE OF NOISE AND REMOVE IT
OK -- Continue to next step.

4. CHECK HARNESS OR CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)

(a) Disconnect the D33 ECU and D32 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. CHECK TRANSPONDER KEY AMPLIFIER

(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the engine starts.

OK:

Engine starts.

NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY

OK -- END