DTC    B279A    Theft Deterrent System Communication Line High Fixation

for Preparation Click here


DESCRIPTION

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

DTC No.
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 or connector
  2. Transponder key ECU
  3. ECM

WIRING DIAGRAM


B215602E03


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.
  2. When the ECM is replaced, reregister the ECU - ECM communication ID.

1.CHECK FOR DTC

  1. Check for DTCs (Click here).
    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 (Click here)
A


2.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)


  1. Disconnect the D29 transponder key ECU connector.


    B215601E05


    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Transponder Key ECU)
    		*2
    		Front view of wire harness connector
    (to ECM)
    *3
    		for 1KR-FE and 1NR-FE
    		*4
    		for 1ND-TV

  1. Disconnect the A18 or A19 ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D29-13 (EFIO) - A19*1-77 (IMI)
    		Always
    		Below 1 Ω
    D29-13 (EFIO) - A18*2-11 (IMI)
    		Always
    		Below 1 Ω
    D29-13 (EFIO) or A19*1-77 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    D29-13 (EFIO) or A18*2-11 (IMI) - Body ground
    		Always
    		10 kΩ or higher

    1. *1: for 1ND-TV
    2. *2: for 1KR-FE and 1NR-FE

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    D29-13 (EFIO) - Body ground
    		Always
    		Below 1 V
    A19*1-77 (IMI) - Body ground
    		Always
    		Below 1 V
    A18*2-11 (IMI) - Body ground
    		Always
    		Below 1 V

    1. *1: for 1ND-TV
    2. *2: for 1KR-FE and 1NR-FE

  1. Reconnect the ECU and ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT TRANSPONDER KEY ECU (OUTPUT)


    B169769E08

  1. Measure the waveform.
    Waveform 
    Terminal No. (Symbol)
    		Tool Setting
    		Switch Condition
    D29-13 (EFIO) - D29-16 (GND)
    		10 V/DIV., 500 msec./DIV.
    		Ignition switch ON
    Result 
    Result
    		Proceed to
    Waveform is not output normally
    		A
    Waveform is output normally (for 1ND-TV)
    		B
    Waveform is output normally (for 1KR-FE)
    		C
    Waveform is output normally (for 1NR-FE)
    		D
    Text in Illustration 
    *1
    		Component with harness connected
    (Transponder Key ECU)



B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)
A


4.INSPECT TRANSPONDER KEY ECU (POWER SOURCE AND BODY GROUND)
B128338E57

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D29-1 (+B) - D29-16 (GND)
    		Ignition switch ON
    		11 to 14 V

    Text in Illustration 
    *1
    		Component with harness connected
    (Transponder Key ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TRANSPONDER KEY ECU