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 ignition relay No. 2 (IG2) actuation circuit inside main body ECU is abnormal

  • Main body ECU

  • AM2 fuse

  • Harness or connector

WIRING DIAGRAM

A01H149E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs Click here.

    2. Check whether DTC B2271 recurs.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. INSPECT FUSE (AM2)


    1. Remove the AM2 fuse from the passenger side junction 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

    NG

    REPLACE FUSE

    OK

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

    A01H1DZE01

    1. Disconnect the L13, L12 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU