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 malfunction in the IG circuit or IG hold circuit in the certification ECU (smart key ECU assembly) 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 certification ECU (smart key ECU assembly) is malfunctioning.*2

  • The IG hold circuit in the certification ECU (smart key ECU assembly) is malfunctioning.*3

  • AM2 NO. 3 fuse

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

  • DTC Output Confirmation Operation:

  • Turn the engine switch on (IG).

  • *1: Only detected while a malfunction is present and the engine switch is on (IG).

  • *2: The IG circuits activate the IG relay.

  • *3: After the IG circuit turns on, even if the certification ECU (smart key ECU assembly) malfunctions, the IG hold circuit maintains the power source mode in on (IG).

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

The engine switch cannot be turned on (IG) (the engine cannot be started).

  • The power source mode cannot be changed to on (IG).

  • The engine switch automatically turns off after turning it on (IG).

  • The engine switch remains on (IG) even when turned off.
Table 2. Related Data List and Active Test Items

DTC No.

Data List and Active Test

B2271

  • Power Source Control

  • IG Relay Monitor (Inside)

  • Latch Circuit

  • Starting Control

  • Ignition

WIRING DIAGRAM

B367012E02

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the engine 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 entry and start system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

    Click hereClick here

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

  • Before replacing the certification ECU (smart key ECU assembly), refer to entry and start system (for Start Function) Precaution.

    Click here

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

Tip:

When the cable is disconnected and reconnected to the negative (-) 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. B342622C11

      *a

      Front view of wire harness connector

      (to Certification ECU (smart key ECU assembly))

      Disconnect the E49 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E49-1 (+B) - Body ground

      Always

      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. B342622C12

      *a

      Front view of wire harness connector

      (to Certification ECU (smart key ECU assembly))

      Disconnect the E49 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E49-10 (E) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    1. B368778C07

      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the E49 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E49-20 (IG1D) - Body ground

      Engine switch on (ACC) → Engine switch on (IG)

      1 V or less → 9 V or higher

    Result

    Proceed to

    OK

    NG
    OK

    END (TEMPORARY CONNECTION FAILURE IS SUSPECTED)

    Click hereClick hereClick here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)