DESCRIPTION This DTC is
stored when a malfunction in the IG circuit or IG hold circuit of 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 of the certification ECU (smart key ECU assembly) is malfunctioning.*2
- The IG hold circuit of the certification ECU (smart key ECU assembly) is malfunctioning.*3
|
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
|
- Turn the engine switch on (IG).
|
- *1: Only detected while a malfunction is present and the engine switch is on (IG).
- *2: The IG circuit and IG hold circuit 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 will maintain the
power source mode in on (IG).
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 and Active Test | |
B2271 | Power Source Control
- IG Relay Monitor (Inside)
- Latch Circuit
Starting Control
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the engine switch off, connect the
Techstream to the DLC3 and turn a courtesy light switch on and off at
intervals of 1.5 seconds or less until communication between the
Techstream and the vehicle begins. Then select the vehicle type under
manual mode and enter the following menus: Body Electrical / Smart Key.
While using the Techstream, periodically turn a courtesy light switch on
and off at intervals of 1.5 seconds or less to maintain communication
between the Techstream and the vehicle.
- The smart key system (for Start Function, Gasoline Model) uses the LIN
communication system and CAN communication system. Inspect the
communication function by following How to Proceed with Troubleshooting.
Troubleshoot the smart key system (for Start Function, Gasoline Model)
after confirming that the communication systems are functioning
properly.
Click here 
- Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
- After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE |
1. | CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| (a) Measure the voltage according to the value(s) in the table below.
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
G40-17 (IG1D) - Body ground |
Engine switch on (ACC) → Engine switch on (IG) |
1 V or less → 9 V or higher | |
 |
|
*a | Component with harness connected (Certification ECU (Smart Key ECU Assembly)) | | |
| OK |
 | END (TEMPORARY CONNECTION FAILURE IS SUSPECTED) |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | |
