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 IG1 drive circuit, IG2 drive circuit or IG hold circuit in the certification ECU (smart key ECU assembly) is detected.

Tech Tips

When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2271

Either condition is met (1-trip detection logic*1):


  • The IG1 or IG2 drive circuit in the certification ECU (smart key ECU assembly) is malfunctioning.

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

  • AM2 No. 2 fuse

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

Turn the engine switch on (IG).

Tech Tips

To turn the engine switch on (IG), carry the key and press the engine switch twice with the shift lever in P or N*2 and the brake pedal*2 or clutch pedal*3 released.

Tech Tips


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

  • After the IG1 and IG2 drive circuits turn on, even if the certification ECU (smart key ECU assembly) operates incorrectly, the IG hold circuit maintains the engine switch on (IG) state.

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The power source mode is not allowed to change to on (IG) (the engine cannot be started). The power source mode cannot be changed to on (IG).
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


    Engine

  • Ignition Status

 -

WIRING DIAGRAM

A004HGHE03

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the GTS and vehicle begins.

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.

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

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

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A004IP3E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the D48 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
      D48-2 (+B) - Body ground Always 9.5 to 16 V

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (GROUND)

    A004KBGE01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Reconnect the D48 certification ECU (smart key ECU assembly) connector.

      A004KH7E01
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D41-6 (IG1D) - Body ground Engine switch on (ACC) → Engine switch on (IG) Below 1 V → 9 V or higher
      D48-9 (IG2D) - Body ground Engine switch on (ACC) → Engine switch on (IG) Below 1 V → 9 V or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)