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ENTRY AND START SYSTEM (for Start Function), Diagnostic DTC:B2271

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DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction
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DESCRIPTION

This DTC is stored when the IG output circuits inside the main body ECU are open or shorted.

DTC Code Detection Condition Trouble Area
B2271 The IG1 No. 3 relay actuation circuit or integration relay (IG2 relay) actuation circuit inside the main body ECU is abnormal.

  • Main body ECU


  • AM2 fuse


  • Harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs (Click here).

    2. Check whether DTC B2271 is output.

      Table 1. Result
      Result Proceed to
      DTC B2271 output A
      No DTC output B

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    INSPECT FUSE (AM2)


    1. Remove the AM2 fuse from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AM2 fuse Always Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)


    1. Disconnect the E1, E2 and 2D main body ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E1-6 (AM1) - Body ground Always 11 to 14 V
      E2-1 (AM2) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-62 (GND2) - Body ground Always Below 1 Ω

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    REPLACE MAIN BODY ECU

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    USE SIMULATION METHOD TO CHECKClick here

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    REPLACE FUSE

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    REPAIR OR REPLACE HARNESS OR CONNECTOR