Click here

SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2271

Click here
Click here
DTC Code DTC Name
B2271 Ignition Hold Monitor Malfunction
Click here

DESCRIPTION

This DTC is stored when a malfunction in the IG1 circuit, IG2 circuit or IG hold circuit in the certification ECU (Smart key ECU assembly) is detected.

Tip:

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 Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2271

When either of the following conditions is met (1-trip detection logic*):


  • The IG1 or IG2 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

  • Certification ECU (Smart key ECU assembly)

  • Wire harness or connector

Turn the power switch on (IG).

Tip:

To turn the power switch on (IG), carry the electrical key transmitter sub-assembly and press the power switch twice with the shift lever in P and the brake pedal released.

Tip:

  • 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).

Table 1. 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).
A0004YDE04
Click here

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle power switch off, connect the GTS to the vehicle 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.

  • 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.

Tip:
Table 2. Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2271
  • Power Source Control

  • IG1 Relay Monitor (Inside)

  • IG2 Relay Monitor (Inside)

  • Latch Circuit

 -
Click here

PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE)


    1. Disconnect the A72 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
      A72-2 (+B) - Body ground Power switch off 11 to 14 V
      Table 3. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

    • OKClick here
    • NG

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

  2. Click here

    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
      A72-11 (E) - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *a

      Rear view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. A0008S8E01

      Reconnect the H194 and A72 certification ECU (Smart key ECU assembly) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A72-9 (IG2D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      H194-6 (IG1D) - Body ground Power switch on (ACC) → Power switch on (IG) 1 V or less → 9 V or higher
      Table 5. Text in Illustration
      *a

      Component with harness connected

      (to Certification ECU (Smart Key ECU Assembly))

    • OK

      END (USE SIMULATION METHOD TO CHECK) (Click here)

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (Click here)