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 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.

DTC No. 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

  • IG1 relay

  • IG2 relay

  • Power management control ECU

  • Main Body ECU (driver side junction block assembly)

  • Engine room relay block

  • Wire harness or connector

WIRING DIAGRAM

A01EJ6ME04

INSPECTION PROCEDURE

Note


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

  • 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. A01EIV4E06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D43 connector from the power management control ECU.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D43-1 (AM22) - Body ground Always 9.5 to 16 V
      D43-2 (AM21) - Body ground Always 9.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

    OK

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


    1. A01EIV4E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D43 connector from the power management control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D43-5 (GND2) - Body ground Always Below 1 Ω
      D43-6 (GND) - Body ground Always Below 1 Ω

    NG

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

    OK

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


    1. Disconnect the 2G connector from the main body ECU (driver side junction block assembly).

      A01EJCCE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D43-20 (IG1D) - 2G-29 Always Below 1 Ω
      D43-20 (IG1D) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK)

    OK

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


    1. A01EKPPE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))

      Disconnect the 2F connector from the main body ECU (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
      2F-16 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVER SIDE JUNCTION BLOCK -BODY GROUND)

    OK

  5. INSPECT IG1 RELAY


    1. A01EKXQ

      Remove the IG1 relay from the main body ECU (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
      1 - 2 Always 93.8 to 136.4 Ω
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IG1 RELAY

    OK

  6. INSPECT MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Remove the main body ECU (driver side junction block assembly).

      A01EK87E01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2G-29 - IG1 relay terminal 2 Always Below 1 Ω
      2G-29 - Body ground Always 10 kΩ or higher
      2F-16 - IG1 relay terminal 1 Always Below 1 Ω
      2F-16 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Components without harness connected

      (Main Body ECU (Driver Side Junction Block Assembly))

      		 *3

      Component without relay connected

      (IG1 relay terminal)
      *2

      Components without harness connected

      (Main Body ECU (Driver Side Junction Block Assembly))

      		 *4 -

    NG

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY)


    1. Disconnect the D42 connector from the power management control ECU.

      A01EKN1E01

    2. Remove the IG2 relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D42-8 (IG2D) - IG2 relay terminal 1 Always Below 1 Ω
      D42-8 (IG2D) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connected

      (to Power Management Control ECU)

      		 *2

      Component without relay connected

      (IG2 relay terminal)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY)

    OK

  8. CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)


    1. A01EKIYE01
      Text in Illustration
      *1

      Component without relay connected

      (IG2 Relay Terminal)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IG2 relay terminal 2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND)

    OK

  9. INSPECT IG2 RELAY


    1. A01ELIA

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 Always 93.8 to 136.4 Ω
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IG2 RELAY

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here