Dtc B2797 Communication Malfunction No. 1

Vehicle Interior. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Theft Deterrent Keyless Entry. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK KEY

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

CHECK TRANSPONDER KEY ECU ASSEMBLY

REPLACE TRANSPONDER KEY AMPLIFIER (OPERATION)

CHECK WHETHER ENGINE STARTS

DTC B2797 Communication Malfunction No. 1


DESCRIPTION

This DTC is stored 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 together, or 2) noise is occurring in the communication line.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2797
A key with a BCC malfunction is inserted into the ignition key cylinder (1 trip detection logic*).
  1. Key
  2. Harness or connector
  3. Transponder key amplifier
  4. Transponder key ECU assembly
Insert the key into the ignition key cylinder
  1. *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Operation when Malfunction Detected
Engine cannot be started.
-

Related Data List and Active Test
DTC Code
Data List and Active Test
B2797
BCC Malfunction

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Theft Deterrent Keyless Entry.Engine Immobiliser System. Dtc B2797 Communication Malfunction No. 1


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the transponder key ECU assembly, refer to the Service Bulletin.
  2. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CHECK KEY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

  1. Check whether the ignition key being used is near other ignition keys, as shown in the illustration. Also, check whether a 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 (HILUX_TGN26 RM000000Z3I00TX.html).

  1. Insert a key into the ignition key cylinder, and then remove it. Repeat this for all the other keys.

  1. Check that no code is output.

    OK:
    DTC B2797 is not output.


NG
Go to step 3
OK

END

3.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

  1. Disconnect the G26 transponder key ECU assembly connector.

  1. Disconnect the G28 transponder key amplifier connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G26-15 (CODE) - G28-4 (CODE)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK TRANSPONDER KEY ECU ASSEMBLY


  1. Using an oscilloscope or the intelligent tester, check for noise in the waveform between the terminals of the G28 transponder key amplifier connector and G26 transponder key ECU assembly connector.


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Theft Deterrent Keyless Entry.Engine Immobiliser System. Dtc B2797 Communication Malfunction No. 1


    Text in Illustration
    *a
    		Component with harness connected
    (Transponder Key Amplifier)
    		*b
    		Component with harness connected
    (Transponder Key ECU Assembly)
    *c
    		Noise should not appear
    		-
    		-
    Measurement Condition
    Item
    		Content
    Tester Connection
    		G26-15 (CODE) - G28-4 (CODE)
    Tool Setting
    		5 V/DIV., 20 msec./DIV.
    Condition
    		Key inserted in ignition key cylinder
    OK:
    No noise is present (see illustration).


NG
FIND CAUSE OF NOISE AND REMOVE IT
OK


5.REPLACE TRANSPONDER KEY AMPLIFIER (OPERATION)

  1. Temporally replace the transponder key amplifier with a new or normally functioning one (HILUX_TGN26 RM0000037YH011X.html).


NEXT


6.CHECK WHETHER ENGINE STARTS

  1. Check that the engine starts normally.

    OK:
    Engine starts.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)