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 fuse, an open or short in the wire harness between the fuse and power management control ECU, a short in the IG output circuit inside the power management control ECU, a short between the power management control ECU and relay, or a short in the relay, is detected.

Tech Tips

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code DTC Detection Condition Trouble Area
B2271 The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside the power management control ECU is open or shorted.

  • AM2 fuse

  • Main body ECU (Driver side junction block assembly) (IG1 relays)

  • No. 1 integration relay (IG2 relay)

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A0095OQE02

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)


    1. A009C2XE06
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the G51 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G51-2 (AM21) - Body ground Always 9.5 to 14 V
      G51-1 (AM22) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)


    1. Disconnect the G51 power management control ECU connector.

    2. A009C2XE07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-6 (GND) - Body ground Always Below 1 Ω
      G51-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)


    1. A009AVEE12
      Text in Illustration
      *a

      Component without harness connected

      (No. 1 Integration Relay)

      Remove the No. 1 integration relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-1 - 1A-3 20°C (68°F) 255 to 387 Ω

    NG

    REPLACE NO. 1 INTEGRATION RELAY

    OK

  4. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)


    1. A009528E05
      Text in Illustration
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      Remove the driver side junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2A-52 - 2D-4 20°C (68°F) 101.25 to 123.75 Ω

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the G51 power management control ECU connector.

    2. Disconnect the 2A driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-20 (IG1D) - 2A-52 Always Below 1 Ω
      G51-20 (IG1D) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)


    1. Disconnect the 2D driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-4 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)


    1. Disconnect the G50 power management control ECU connector.

    2. Disconnect the 1A No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G50-8 (IG2D) - 1A-1 Always Below 1 Ω
      G50-8 (IG2D) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)


    1. Disconnect the 1A No. 1 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-3 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK POWER MANAGEMENT CONTROL ECU


    1. Install the No. 1 integration relay.

    2. Install the driver side junction block assembly.

    3. Connect the power management control ECU connectors.

      A0097B5E15
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G50-8 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      G51-20 (IG1D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here