ENTRY AND START SYSTEM, Diagnostic DTC:B2271

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

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

DTC Code Detection Condition Trouble Area
B2271 D-IG1-1 relay actuation circuit or IG2 relay actuation circuit inside main body ECU is abnormal

  • Main body ECU

  • AM2 fuse

  • Harness or connector

WIRING DIAGRAM

A001COIE05
*a from Battery
*b Main Body ECU

PROCEDURE


  1. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs Click here.

    2. Start the engine.

    3. Allow the engine to idle for 1 minute or more.

    4. Read DTCs.

      Result
      Display (DTC output) Proceed to
      B2271 A
      No DTC output B

    B

    END (SYSTEM IS OK)

    A

  2. INSPECT FUSE (AM2)


    1. Remove the AM2 fuse from the passenger side junction block.

    2. Measure the resistance of the fuse.

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

    NG

    REPLACE FUSE

    OK

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

    A001FGHE01
    *1 Front view of wire harness connector: (to Main Body ECU)

    1. Disconnect the L12, L13 and DA 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
      L13-6 (AM1) - Body ground Always 11 to 14 V
      L12-1 (AM2) - Body ground Always 11 to 14 V
      Standard resistance
      Tester Connection Condition Specified Condition
      DA-40 (GND1) - Body ground Always Below 1 Ω

    OK

    REPLACE MAIN BODY ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR