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Inspection Procedure

  1. CHECK WHETHER DTC OUTPUT RECURS 
    1. Clear the DTCs (see DTC CHECK/CLEAR  ).
    2. Check whether DTC B2276 recurs 50 seconds or more after the engine switch is turned on (IG).

      Result 

      RESULT REFERENCE

      Display (DTC output) Proceed to
      B2276 A
      No DTC output B

      B: END (SYSTEM IS OK) 

      A: Go to next step. 

  2. CHECK MAIN BODY ECU (ACCR VOLTAGE) 
    1. Disconnect the L12 main body ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      L12-3 (ACCR) - Body ground When operating the engine switch to crank the engine. 11 to 14 V
      Fig 1: Identifying L12 Main Body ECU Connector Terminal
      G04943841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK:  Go to step  4

      NG: Go to next step. 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) 
    Fig 2: Identifying Main Body ECU Connector Terminal And ECM Connector Terminal
    G04943842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L12 main body ECU connector.
    2. Disconnect the A13 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      L12-3 (ACCR) - A13-19 (ACCR) Always Below 1 Ω
      L12-3 (ACCR) or A13-19 (ACCR) - Body ground Always 10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to next step. 

  4. CHECK MAIN BODY ECU (OPERATION) 
    1. Temporarily replace the main body ECU with a new or normally functioning one.
    2. Check whether DTC B2276 recurs by repeating the "CHECK WHETHER DTC OUTPUT RECURS" procedures above.

      OK: No DTC is output. 

      NG: GO TO SFI SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

      OK: END (MAIN BODY ECU IS FAULTY) 

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