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

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a problem such as an open in the AM2 NO. 2 fuse, an open or short in the wire harness between the fuse and main body ECU, a short in the IG output circuit inside the main body ECU, a short between the main body ECU and relay, or a short in the relay is detected.

Tech Tips

When the main body ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No. DTC Detection Condition Trouble Area
B2271 The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside the main body ECU is open or shorted

  • AM2 NO. 2 fuse

  • Main body ECU

  • Wire harness or connector

WIRING DIAGRAM

A01CEA2E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. After 6 seconds have elapsed, recheck for DTCs and check if the same DTC is output.

      OK
      DTC B2271 is not output.

    NG

    INSPECT FUSE (AM2 NO. 2 FUSE) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT FUSE (AM2 NO. 2 FUSE)


    1. Remove the AM2 NO. 2 fuse from the No. 1 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 NO. 2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE (AM2 NO. 2 FUSE)

    OK

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


    1. Disconnect the G48 and G49 connectors from the main body ECU.

      A01CG0SE04

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G49-1 (AM2) - Body ground Always 11 to 14 V
      G48-6 (AM1) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - MAIN BODY ECU)

    OK

    REPLACE MAIN BODY ECU Click here