SMART KEY SYSTEM (for Start Function), Diagnostic DTC:B2271

DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction

DESCRIPTION

This DTC is stored when a malfunction in the IG1 circuit, IG2 circuit or IG hold circuit in the power management control ECU is detected.

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.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2271

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


  • The IG1 or IG2 circuit in the power management control ECU is malfunctioning.

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

  • AM2 fuse

  • Power management control ECU

  • Wire harness or connector

Turn the power switch on (IG).

Tech Tips

To turn the power switch on (IG), carry the electrical key transmitter sub-assembly and press the power switch twice with the shift lever in P and the brake pedal released.

Tech Tips


  • The IG1 and IG2 circuits activate the IG1 and IG2 relays.

  • After the IG1 and IG2 circuits turn on, even if the CPU operates incorrectly, the IG hold circuit maintains the power source mode in 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).

WIRING DIAGRAM

A01HTG2E01

INSPECTION PROCEDURE

Note


  • When using the Techstream with the power switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus:

    for Power Source Control: Body Electrical / Power Source Control / DTC.

    for Smart Key: Body Electrical / Smart Key / DTC.

  • The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

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

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Tech Tips

Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2271

    Power Source Control

  • IG1 Relay Monitor (Inside)

  • IG2 Relay Monitor (Inside)

  • Latch Circuit

 -

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A01HSXQE07
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

    1. Disconnect the I3 and I4 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
      I3-1 (AM22) - Body ground Power switch off 11 to 14 V
      I4-7 (AM21) - Body ground Power switch off 11 to 14 V

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    A01HSXQE08
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I3-5 (E01) - Body ground Always Below 1 Ω
      I3-6 (E1) - Body ground Always Below 1 Ω
      I4-4 (E12) - Body ground Always Below 1 Ω
      I4-5 (E02) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK POWER MANAGEMENT CONTROL ECU


    1. A01HVBIE14
      Text in Illustration
      *a

      Component with harness connected

      (to Power Management Control ECU)

      Reconnect the I3 and I4 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
      A39-2 (IG2D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      I4-2 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END (USE SIMULATION METHOD TO CHECK) Click here