Dtc B279A Theft Deterrent System Communication Line High Fixation

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

CHECK TRANSPONDER KEY ECU (OUTPUT)

CHECK TRANSPONDER KEY ECU (POWER SOURCE AND BODY GROUND)

REPLACE TRANSPONDER KEY ECU

REGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK DTC

DTC B279A Theft Deterrent System Communication Line High Fixation


DESCRIPTION

If the communication line (EFIO-IMI) to the transponder key ECU is stuck on HI output, the ECM outputs this DTC.

DTC Code
DTC Detection Condition
Trouble Area
B279A
When communication line (EFIO-IMI) between ECM and transponder key ECU is stuck on HI output for 6 seconds or more
  1. Wire harness
  2. Transponder key ECU
  3. ECM

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B279A Theft Deterrent System Communication Line High Fixation


INSPECTION PROCEDURE

1.CLEAR DTC

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


NEXT


2.CHECK FOR DTC

  1. Check for DTC (RAV4_ACA30 RM000001TCQ00EX.html).

    Result
    Result
    		Proceed to
    DTC B279A is output
    		A
    DTC B279A and other DTCs are output
    		B
    HINT:
    If any DTCs other than B279A are output, troubleshoot those DTCs first.


B
GO TO DIAGNOSTIC TROUBLE CODE CHART (RAV4_ACA30 RM000001TCA00EX.html)
A


3.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Disconnect the E50 ECU connector.

  1. Disconnect the A12 ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E50-13 (EFIO) - A12-11 (IMI)
    		Always
    		Below 1 Ω
    E50-13 (EFIO) or A12-11 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E50-13 (EFIO) - Body ground
    		Always
    		Below 1 V
    A12-11 (IMI) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK TRANSPONDER KEY ECU (OUTPUT)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B279A Theft Deterrent System Communication Line High Fixation

  1. Measure waveform.

    Waveform 1 (Reference)
    Tester Connection
    		Tool Setting
    		Switch Condition
    E50-13 (EFIO) - E50-16 (GND)
    		10 V/DIV., 500 msec./DIV.
    		Ignition switch ON
    OK:
    Waveform is output normally (see illustration).
    Result
    Result
    		Proceed to
    OK (for 1AZ-FE)
    		A
    OK (for 2AZ-FE)
    		B
    OK (for 2GR-FE)
    		C
    OK (for 3ZR-FAE)
    		D
    NG
    		E


B
REPLACE ECM (RAV4_ACA30 RM0000017UO01HX.html)

C
REPLACE ECM (RAV4_ACA30 RM0000017UO01GX.html)

D
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)

E
Go to step 5
A

REPLACE ECM (RAV4_ACA30 RM0000017UO01FX.html)

5.CHECK TRANSPONDER KEY ECU (POWER SOURCE AND BODY GROUND)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B279A Theft Deterrent System Communication Line High Fixation

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E50-1 (+B) - E50-16 (GND)
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE TRANSPONDER KEY ECU

  1. Replace the transponder key ECU.


NEXT


7.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID.


NEXT


8.CLEAR DTC

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


NEXT


9.CHECK DTC

  1. Check for DTC (RAV4_ACA30 RM000001TCQ00EX.html).

    Result
    Result
    		Proceed to
    DTC B279A is not output
    		A
    DTC B279A is output (for 1AZ-FE)
    		B
    DTC B279A is output (for 2AZ-FE)
    		C
    DTC B279A is output (for 2GR-FE)
    		D
    DTC B279A is output (for 3ZR-FAE)
    		E


B
REPLACE ECM (RAV4_ACA30 RM0000017UO01FX.html)

C
REPLACE ECM (RAV4_ACA30 RM0000017UO01HX.html)

D
REPLACE ECM (RAV4_ACA30 RM0000017UO01GX.html)

E
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)
A

END (TRANSPONDER KEY ECU IS DEFECTIVE)