PUSH-BUTTON START, Diagnostic DTC:B2271

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the IG circuit and IG hold circuit in the power management control ECU is detected.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2271 Ignition Hold Monitor Malfunction

When either of the following conditions is met (1-trip detection logic*1):


  • The IG circuit in the power management control ECU is malfunctioning.*2

  • The IG hold circuit in the power management control ECU is malfunctioning.*3

  • AM2 fuse

  • Power management control ECU

  • Wire harness or connector

    DTC Output Confirmation Operation:

  • Turn the power switch on (IG).

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The power switch cannot be turned on (IG) (the hybrid control system cannot be started). The power source mode cannot be changed to on (IG).
Related Data List and Active Test Items
DTC No. Data List and Active Test
B2271

    Power Source Control

  • IG Relay Monitor (Inside)

  • Latch Circuit

WIRING DIAGRAM

A01MS8HE02

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The push-button start uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the push-button start after confirming that the communication systems are functioning properly.

    Click here

  • Before replacing the power management control ECU, refer to push-button start Precaution.

    Click here

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

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

Tech Tips

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. A01MSOUC16
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the K32 and K33 power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K32-1 (AM22) - Body ground Power switch off 11 to 14 V
      K33-7 (AM21) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)


    1. Disconnect the K32 and K33 power management control ECU connectors.

    2. A01MSOUC17
      *a

      Front 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
      K32-5 (E01) - Body ground Always Below 1 Ω
      K32-6 (E1) - Body ground Always Below 1 Ω
      K33-4 (E12) - Body ground Always Below 1 Ω
      K33-5 (E02) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK POWER MANAGEMENT CONTROL ECU


    1. A01MSE5C44
      *a

      Component with harness connected

      (Power Management Control ECU)

      Reconnect the K32 and K33 power management control ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K33-2 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      Result
      Proceed to
      OK
      NG

    OK

    END (TEMPORARY CONNECTION FAILURE IS SUSPECTED) Click here

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here