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 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 power management control ECU is open or shorted.

  • AM2 NO. 2 fuse

  • IG2 NO. 2 fuse

  • Instrument panel junction block assembly (IG1 relay)

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A01ISWDE03

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. A01IUFQE04
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the H71 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
      H71-2 (AM21) - Body ground Always 9.5 to 16 V
      H71-1 (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 H71 power management control ECU connector.

    2. A01IUFQE05
      Text in Illustration
      *1

      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
      H71-6 (GND) - Body ground Always Below 1 Ω
      H71-5 (GND2) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY)


    1. A01INT1E01
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Disconnect the DE and DF instrument panel junction block assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DF-3 - DE-28 (relay coil side circuit) 20°C (68°F) 152 to 203 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

  4. INSPECT IG1 RELAY


    1. A01IUBFE51

      Remove the IG1 relay from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      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

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

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


    1. Disconnect the H71 and H70 power management control ECU connectors.

      A01IPYFE02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H70-8 (IG2D) - Body ground 20°C (68°F) 255 to 387 Ω
      H71-20 (IG1D) - Body ground 20°C (68°F) 152 to 203 Ω
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 - -

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY) Click here

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connectors.

      A01IUO1E09

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H70-8 (IG2D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      H71-20 (IG1D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      		 - -
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  7. REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 RELAY)


    1. Replace the instrument panel junction block (IG1 relay) with a new or normally functioning part, or repair or replace any damaged wire harness or connector.


    NEXT

  8. CHECK POWER MANAGEMENT CONTROL ECU


    1. Connect the power management control ECU connectors.

      A01IUO1E10

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H70-8 (IG2D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      H71-20 (IG1D) - Body ground Engine switch off Below 1.0 V
      Engine switch on (IG) ((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher
      Text in Illustration
      *1

      Component with harness connected

      (Power Management Control ECU)

      		 - -
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

    END