DESCRIPTION This DTC is
stored when a malfunction in the ACC output circuit is detected. The ACC
output circuit is the circuit between terminal ACCD of the
certification ECU (smart key ECU assembly) and the ACC relay. |
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Note | | B2274 |
ACC Monitor Malfunction |
The ACC relay circuit of the certification ECU (smart key ECU assembly) is malfunctioning. (1-trip detection logic*)
HINT: When the voltage at terminal ACCD is not at the standard, the system is determined to be malfunctioning. |
- Instrument panel junction block assembly
- Certification ECU (smart key ECU assembly)
- Wire harness or connector
|
- Wait 10 seconds after turning the power switch on (ACC) or on (IG), and
then wait another 10 seconds after turning the power switch off.
|
- *: Only detected while a malfunction is present.
Vehicle Condition and Fail-safe Function when Malfunction Detected |
Vehicle Condition when Malfunction Detected |
Fail-safe Function when Malfunction Detected |
- If there is a malfunction due to the ACC relay being stuck on, the ACC
relay does not turn off even though the power switch is off.
- If there is a malfunction due to the ACC relay being stuck off, the ACC
relay does not turn on even though the power switch is on (ACC).
HINT: The power switch can be turned on (IG) and the hybrid control system can be started. |
- | Related Data List and Active Test Items |
DTC No. | Data List and Active Test | |
B2274 | Power Source Control
| WIRING DIAGRAM
 CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the power 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, HV 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, HV Model) after
confirming that the communication systems are functioning properly.
Click here 
- Inspect the fuses of circuits related to this system before performing the following procedure.
- 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
HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY -
CERTIFICATION ECU (SMART KEY ECU ASSEMBLY), AUXILIARY BATTERY AND BODY
GROUND) | (a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the 4A, 4D and 4K instrument panel junction block assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G40-16 (ACCD) - 4A-30 |
Always | Below 1 Ω | |
4D-3 - Body ground | Always |
Below 1 Ω | |
G40-16 (ACCD) or 4A-30 - Other terminals and body ground |
Always | 10 kΩ or higher |
(d) Measure the voltage according to the value(s) in the table below. Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
4K-1 - Body ground | Power switch off |
11 to 14 V |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK |
 | |
| 2. |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) |
(a) Remove the instrument panel junction block assembly. Click here
(b) Connect all of the instrument panel junction block assembly connectors.
(c) Connect the G40 certification ECU (smart key ECU assembly) connector.
(d) Measure the voltage according to the value(s) in the table below.
|
*a | Component with harness connected
(Instrument Panel Junction Block Assembly) |
- | - |
Standard Voltage: |
Tester Connection | Condition |
Specified Condition | |
4H-26 - Body ground | Power switch on (ACC) |
11 to 14 V |
| NG |
| REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
OK | |
| |
| 3. |
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 | |
G40-16 (ACCD) - Body ground |
Power switch off → Power switch on (ACC) |
1 V or less → 8.5 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) | |
