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

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is output when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power source control ECU, a short in the IG output circuit inside the power source control ECU, a short between the power source control ECU and relay, and a short in the relay is detected.

Tech Tips

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the 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 Hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside power source control ECU is open or short

  • AM2 fuse

  • Power source control ECU

  • Wire harness or connector

WIRING DIAGRAM

A01611JE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC


    1. Clear the DTC Click here.

    2. Turn the engine switch on (IG).

    3. Depress the brake pedal.

    4. After 6 seconds have elapsed, check if the trouble occurs again.

    5. Check for DTCs again.

      OK
      B2271 is not output.

    NG

    INSPECT FUSE (AM2 FUSE) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT FUSE (AM2 FUSE)


    1. Remove the AM2 fuse from the main body ECU RH (cowl side junction block RH).

    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 (AM2 FUSE)

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - POWER SOURCE CONTROL ECU)


    1. A0162Y6E03

      Disconnect the J55 connector from power source control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J55-12 (AM2) - Body ground Always 11 to 14 V
      J55-33 (AM1) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CONTROL ECU - BODY GROUND)

    OK

    REPLACE POWER SOURCE CONTROL ECU