Toyota Yaris: Smart Key System (for Start Function) / Vehicle Speed Signal Circuit Open (B228231,B228262)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Vehicle Speed Signal Circuit Open (B228231,B228262)

DESCRIPTION

DTC B228231 is stored when the vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match.

DTC B228262 is stored when a malfunction in the vehicle speed sensor is detected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B228231

Vehicle Speed Signal Circuit Open

The vehicle speed signal sent by the combination meter assembly via direct line and the vehicle speed signal sent via CAN communication do not match. (1-trip detection logic*)
  • Meter/gauge system
  • Vehicle stability control system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
  • Drive the vehicle at a vehicle speed of 25 km/h (16 mph) or more for 20 seconds, and then drive the vehicle at a vehicle speed of less than 5 km/h (3 mph) for 20 seconds.

B228262

Vehicle Speed Signal Compare Failure

Vehicle speed signal malfunction is detected (excessive deceleration is detected). (1-trip detection logic*)
  • Meter/gauge system
  • Vehicle stability control system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
  • Drive the vehicle at a vehicle speed of 50 km/h (31 mph) or more for 10 seconds, and then drive the vehicle at a vehicle speed of less than 50 km/h (31 mph).
  • *: Only detected while a malfunction is present and the ignition switch is ON.
Vehicle Condition and Fail-safe Function when Malfunction Detected

DTC Code

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

B228231
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle speed is 0 km/h (0 mph), there is no effect on vehicle behavior.
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle is moving, the ignition switch cannot be turned from ON to off.

-

B228262
  • The power source mode is changed to off (the engine is stopped) by pressing the engine switch while the vehicle is being driven.
  • With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine will not start.

Steering lock motor operation is prohibited.
Related Data List and Active Test Items

DTC No.

Data List and Active Test

B228231

B228262
Power Source Control
  • Vehicle Running Condition (Line)
  • Power Supply Condition
Combination Meter
  • Vehicle Speed Meter

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the GTS with the ignition 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 vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. 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 key system (for Start Function) 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) 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.

READ VALUE USING GTS (VEHICLE SPEED METER)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Speed Meter

Vehicle speed

Min.: 0, Max.: 255

Almost same as actual vehicle speed (Speedometer tester)

-
Body Electrical > Combination Meter > Data List

Tester Display

Vehicle Speed Meter

HINT:

Using a speedometer tester, check the actual vehicle speed and the vehicle speed displayed on the GTS.

OK:

Vehicle speed displayed on the GTS is almost the same as the actual vehicle speed measured using a speedometer tester.

NG

GO TO METER / GAUGE SYSTEM (Speedometer Malfunction)

OK

2.

READ VALUE USING GTS (VEHICLE RUNNING CONDITION (LINE))

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Running Condition (Line)

Vehicle being driven or stopped

Stop or Driving

Stop: Vehicle stopped

-
Body Electrical > Power Source Control > Data List

Tester Display

Vehicle Running Condition (Line)

OK:

The GTS display changes correctly in response to the vehicle condition.

Result

Proceed to

The value of Vehicle Running Condition (Line) is Stop

A

The value of Vehicle Running Condition (Line) is not Stop

B
B

GO TO STEP 4

A

3.

READ VALUE USING GTS (VEHICLE RUNNING CONDITION (LINE))

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Source Control > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Vehicle Running Condition (Line)

Vehicle being driven or stopped

Stop or Driving

Driving: Vehicle being driven at 5 km/h (3 mph) or more

-
Body Electrical > Power Source Control > Data List

Tester Display

Vehicle Running Condition (Line)

OK:

The GTS display changes correctly in response to the vehicle condition.

Result

Proceed to

The value of Vehicle Running Condition (Line) is Driving

A

The value of Vehicle Running Condition (Line) is not Driving

B
A

GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

B

4.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY))

(a) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

(b) Disconnect the H45 certification ECU (smart key ECU assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H45-13 (SPD) - A108-14 (SP1)

Always

Below 1 Ω

H45-13 (SPD) or A108-14 (SP1) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Connect the H45 certification ECU (smart key ECU assembly) connector.

(b) Connect the A108 skid control ECU (brake actuator assembly) connector.

(c) Using an oscilloscope, check the waveform.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

*b

Waveform

OK:

Tester Connection

Condition

Tool Setting

Specified Condition

H45-13 (SPD) - H46-29 (E)

Ignition switch ON, vehicle being driven at approx. 5 km/h (3 mph)

5 V/DIV., 20 ms./DIV.

Pulse generation

(See waveform)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO VEHICLE STABILITY CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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    Categories

    Break-In Period

    No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.

    Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.

    read more

     
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