ENGINE IMMOBILISER SYSTEM (w/ Entry and Start System), Diagnostic DTC:B279A

DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box (immobiliser code ECU) is stuck on HI output, the ECM outputs this DTC.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CLEAR DTC

   
   

   1. Clear the DTCs (Click here).

   
   
   • NEXTClick here
2. Click here

   CHECK FOR DTC

   
   

   1. Check for DTCs (Click here).

      Tip:

      If DTCs other than DTC B279A are output, troubleshoot those DTCs first.

      Table 1. Result

      Result	Proceed to
      DTC B279A is output	A
      DTC B279A and other DTCs are output	B

   
   
   • AClick here
   • BClick here
3. Click here

   CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)

   
   
   1. 

      Disconnect the E28 ID code box connector.

   2. 

      Disconnect the A38*1 or A52*2 ECU connector.

      Tip:
      

      • *1: for LHD

      • *2: for RHD

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

      
      

      1. for 1UR-FE

         Standard Resistance
         Tester Connection Condition Specified Condition E28-6 (EFIO) - A38*1-40 (IMI) Always Below 1 Ω E28-6 (EFIO) or A38*1-40 (IMI) - Body ground Always 10 kΩ or higher E28-6 (EFIO) - A52*2-40 (IMI) Always Below 1 Ω E28-6 (EFIO) or A52*2-40 (IMI) - Body ground Always 10 kΩ or higher

         Tip:
         

         • *1: for LHD

         • *2: for RHD

         Standard Voltage
         Tester Connection Condition Specified Condition E28-6 (EFIO) - Body ground Always Below 1 V A38*1-40 (IMI) - Body ground A52*2-40 (IMI) - Body ground

         Tip:
         

         • *1: for LHD

         • *2: for RHD

      2. for 1GR-FE, 1VD-FTV

         Standard Resistance
         Tester Connection Condition Specified Condition E28-6 (EFIO) - A38*1-11 (IMI) Always Below 1 Ω E28-6 (EFIO) or A38*1-11 (IMI) - Body ground Always 10 kΩ or higher E28-6 (EFIO) - A52*2-11 (IMI) Always Below 1 Ω E28-6 (EFIO) or A52*2-11 (IMI) - Body ground Always 10 kΩ or higher

         Tip:
         

         • *1: for LHD

         • *2: for RHD

         Standard Voltage
         Tester Connection Condition Specified Condition E28-6 (EFIO) - Body ground Always Below 1 V A38*1-11 (IMI) - Body ground A52*2-11 (IMI) - Body ground

         Tip:
         

         • *1: for LHD

         • *2: for RHD

      3. for 3UR-FE

         Standard Resistance
         Tester Connection Condition Specified Condition E28-6 (EFIO) - A38-40 (IMI) Always Below 1 Ω E28-6 (EFIO) or A38-40 (IMI) - Body ground Always 10 kΩ or higher

         Standard Voltage
         Tester Connection Condition Specified Condition E28-6 (EFIO) - Body ground Always Below 1 V A38-40 (IMI) - Body ground

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK ID CODE BOX (IMMOBILISER CODE ECU) (OUTPUT)

   
   

   1. Using an oscilloscope, check the waveform.

      Table 2. Measurement Condition

      Item	Content
      Tester Connection	E28-6 (EFIO) - E28-8 (GND)
      Tool Setting	10 V/DIV., 100 msec./DIV.
      Condition	Engine switch on (IG)

      OK
      Waveform is output normally (see illustration).

      Table 3. Result

      Result	Proceed to
      NG	A
      OK (for 1GR-FE)	B
      OK (for 1UR-FE)	C
      OK (for 1VD-FTV)	D
      OK (for 3UR-FE)	E

   
   
   • AClick here
   • BClick here
   • CClick here
   • DClick here
   • EClick here
5. Click here

   CHECK ID CODE BOX (IMMOBILISER CODE ECU) (POWER SOURCE AND BODY GROUND)

   
   

   1. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connector Condition Specified Condition E28-1 (+B) - E28-8 (GND) Always 11 to 14 V

   
   
   • OKClick here
   • NGClick here
6. Click here

   Go to DIAGNOSTIC TROUBLE CODE CHARTClick here

7. Click here

   REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

8. Click here

   REPLACE ECMClick here

9. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

10. Click here

    REPLACE ECMClick here

11. Click here

    REPLACE ECMClick here

12. Click here

    REPLACE ECMClick here