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 (ID CODE BOX - ECM)

CHECK ID CODE BOX (OUTPUT)

CHECK ID CODE BOX (POWER SOURCE AND BODY GROUND)

REPLACE ID CODE BOX

ECU CODE REGISTRATION

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 ID code box is stuck on HI output, the ECM outputs this DTC.

DTC Code
DTC Detection Condition
Trouble Area
B279A
The communication line (EFIO-IMI) between the ECM and the ID code box is stuck on HI output.
  1. Wire harness
  2. ID code box
  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 DTCs (RAV4_ACA30 RM000001RM1004X.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (RAV4_ACA30 RM000001RM1004X.html).

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


B
Go to DIAGNOSTIC TROUBLE CODE CHART (RAV4_ACA30 RM000001RLU004X.html)
A


3.CHECK HARNESS AND CONNECTOR (ID CODE BOX - 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 E51 box 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
    E51-6 (EFIO) - A12-11 (IMI)
    		Always
    		Below 1 Ω
    E51-6 (EFIO) or A12-11 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E51-6 (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 ID CODE BOX (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. Using an oscilloscope, check the waveform.

    Measurement Condition
    Item
    		Content
    Tester Connection
    		E51-6 (EFIO) - E51-8 (GND)
    Tool Setting
    		10 V/DIV., 100 msec./DIV.
    Condition
    		Engine switch on (IG)
    OK:
    Waveform is output normally (see illustration).
    Result
    Result
    		Proceed to
    OK (for 1AZ-FE)
    		A
    OK (for 2AZ-FE)
    		B
    OK (for 3ZR-FAE)
    		C
    NG
    		D


B
REPLACE ECM (RAV4_ACA30 RM0000017UO01HX.html)

C
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)

D
Go to step 5
A

REPLACE ECM (RAV4_ACA30 RM0000017UO01FX.html)

5.CHECK ID CODE BOX (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. Turn the engine switch on (IG).

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

    Standard Voltage:
    Tester Connector
    		Condition
    		Specified Condition
    E51-1 (+B) - E51-8 (GND)
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE ID CODE BOX

  1. Replace the ID code box.


NEXT


7.ECU CODE REGISTRATION

  1. Register the ECU code.


NEXT


8.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID.


NEXT


9.CLEAR DTC

  1. Clear the DTCs (RAV4_ACA30 RM000001RM1004X.html).


NEXT


10.CHECK DTC

  1. Check for DTCs (RAV4_ACA30 RM000001RM1004X.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 3ZR-FAE)
    		D


B
REPLACE ECM (RAV4_ACA30 RM0000017UO01FX.html)

C
REPLACE ECM (RAV4_ACA30 RM0000017UO01HX.html)

D
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)
A

END (ID CODE BOX IS DEFECTIVE)