Dtc B2797 Communication Malfunction No. 1

Securities. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Engine Immobiliser. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK KEY

CHECK FOR DTC

CHECK TRANSPONDER KEY ECU (NOISE)

CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

CHECK TRANSPONDER KEY AMPLIFIER (OPERATION)

DTC B2797 Communication Malfunction No. 1


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 Code
DTC Detection Condition
Trouble Area
B2797
Keys are positioned too close to each other, or noise occurred in communication line
  1. Key
  2. Wire harness
  3. Transponder key amplifier
  4. Transponder key ECU

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2797 Communication Malfunction No. 1


INSPECTION PROCEDURE

1.CHECK KEY
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. 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


B
Go to step 3
A


2.CHECK FOR DTC

  1. Separate the keys from each other and/or remove the key ring.

  1. Clear the DTC (RAV4_ACA30 RM000001TCQ00EX.html).

  1. Insert a key into the ignition key cylinder. Remove it. Repeat for all other keys.

  1. Check that no DTC is output.

    OK:
    No DTC is output.


OK
END
NG


3.CHECK TRANSPONDER KEY ECU (NOISE)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2797 Communication Malfunction No. 1

  1. Using an oscilloscope or the intelligent tester, check for noise in the waveform between the terminals of the E8 amplifier connector and E50 ECU connector.

    OK:
    No noise is present (see illustration).
    Tester Connection
    		Tool Setting
    		Tool Setting
    		Specified Condition
    E50-15 (CODE) - E8-4 (CODE)
    		5 V/DIV., 20 msec./DIV.
    		Key inserted
    		No noise is present


NG
FIND CAUSE OF NOISE AND REMOVE IT
OK


4.CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2797 Communication Malfunction No. 1

  1. Disconnect the E50 ECU connector.

  1. Disconnect the E8 amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard Resistance:
    Tester Connection
    		Specified Condition
    E50-15 (CODE) - E8-4 (CODE)
    		Below 1 Ω
    E50-15 (CODE) or E8-4 (CODE) - Body ground
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK TRANSPONDER KEY AMPLIFIER (OPERATION)

  1. Temporarily replace the transponder key amplifier with a new or normally functioning one.

  1. Check that the engine starts normally.

    OK:
    Engine starts normally.


NG
REPLACE TRANSPONDER KEY ECU
OK

END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)