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 fuse

  • MAIN fuse

  • Instrument panel junction block assembly (IG1 relay 1, 2)

  • No. 1 integration relay (IG2 MAIN relay)

  • 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*2 or N*3 and the brake pedal*2, *3 or clutch pedal*4 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).

WIRING DIAGRAM

A005J6IE02

CAUTION / NOTICE / HINT

Note


  • When using the intelligent tester with the engine 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 intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

  • 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.

  • 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 No. Data List Item Active Test Item
B2271

Power Source Control


  • IG1 Relay Monitor(Inside)

  • IG2 Relay Monitor(Inside)

  • Latch Circuit

Starting Control


  • Ignition

 -

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

    A005GV2E01
    Text in Illustration
    *a

    Rear view of harness connected

    (to Certification ECU (Smart Key ECU Assembly))

    1. Disconnect the F65 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
      F65-2 (+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)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F65-11 (E) - 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 F65 certification ECU (smart key ECU assembly) connector.

      A005HF8E01
      *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
      F63-6 (IG1D) - Body ground Engine switch on (ACC) Below 1 V
      Engine switch on (IG) 9 V or higher
      F65-9 (IG2D) - Body ground Engine switch on (ACC) Below 1 V
      Engine switch on (IG) 9 V or higher

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)