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 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 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*):


  • 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

DTC Output Confirmation Operation:


  • 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 park (P) selected 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

A01G402E01

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 Click here. Troubleshoot the push-button start after confirming that the communication systems are functioning properly.

  • Inspect the fuses and relays 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

Related Data List and Active Test Items
DTC No. 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)


    1. A01G38PC09
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the E111 and E112 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
      E111-1 (AM22) - Body ground Power switch off 11 to 14 V
      E112-7 (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. A01G38PC10
      *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
      E111-5 (E01) - Body ground Always Below 1 Ω
      E111-6 (E1) - Body ground Always Below 1 Ω
      E112-4 (E12) - Body ground Always Below 1 Ω
      E112-5 (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. A01G3LDC06
      *a

      Component with harness connected

      (to Power Management Control ECU)

      Reconnect the A130 and E112 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
      A130-2 (IG2D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      E112-2 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    A

    END (USE SIMULATION METHOD TO CHECK) Click here

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here