ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2784

DESCRIPTION

The transponder key coil receives key code signals from the key's transponder chip. The coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER (TRANSPONDER KEY COIL)

   
   

   1. Check the Data List for proper functioning of the transponder key coil.

      Transponder key ECU assembly:

      Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
      Antenna Coil Status	Transponder key coil condition / NORMAL or FAIL	NORMAL: Transponder key coil is normal FAIL: Transponder key coil is malfunctioning	-

      OK
      NORMAL (transponder key coil is normal) appears on screen.

   
   

   OK

   REPLACE TRANSPONDER KEY ECU

   NG

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

   
   

   1. 

      Disconnect the H44 transponder key ECU connector.

   2. Disconnect the H43 transponder key amplifier connector.

   3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition H44-14 (VC5) - H43-1 (VC5) Below 1 Ω H44-15 (CODE) - H43-4 (CODE) H44-4 (TXCT) - H43-5 (TXCT) H44-5 (AGND) - H43-7 (AGND)

      Standard resistance (Check for short)
      Tester Connection Specified Condition H44-14 (VC5) or H43-1 (VC5) - Body ground 10 kΩ or higher H44-15 (CODE) or H43-4 (CODE) - Body ground H44-4 (TXCT) or H43-5 (TXCT) - Body ground

   4. Reconnect the transponder key amplifier connector.

   5. Reconnect the transponder key ECU connector.

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE TRANSPONDER KEY AMPLIFIER