SMART 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.

Tech Tips

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.

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.

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

  • SMART fuse

  • Certification ECU (smart key ECU assembly)

  • Harness or connector

Turn the engine switch on (IG).

Tech Tips

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

Tech Tips


  • The IG circuit activates the No. 1 ignition relay and No. 2 ignition relay.

  • After the IG circuit turns on, even if the CPU operates incorrectly, the IG hold circuit maintains the power source mode in on (IG).

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch is on (IG) ○ ○
Malfunction Status The IG 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. - ○
Detection Time - -
Trip Count 1-trip 1-trip

Tech Tips

If the conditions match either of these patterns, a DTC will be output.

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).
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2271

    Power Source Control

  • IG Relay Monitor (Inside)

  • Latch Circuit


    Starting Control

  • Ignition

 -

WIRING DIAGRAM

B003JOPE01

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 the 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 smart entry and start 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 entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

    Click here

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

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. B003Q0QC18
      *a Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the G16 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
      G16-1 (+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. B003Q0QC19
      *a Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

      Disconnect the G16 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
      G16-10 (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. Connect the G16 certification ECU (smart key ECU assembly) connector.

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

      B003S5HC04
      *a Component with harness connected (Certification ECU (Smart Key ECU Assembly)) - -
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G16-20 (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

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)