Dtc B2059 Vehicle Speed Malfunction

Lexus IS250 IS220d GSE20 ALE20 - PRE-CRASH SAFETY

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)

CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM)

READ VALUE OF INTELLIGENT TESTER

REPLACE DISTANCE CONTROL ECU ASSEMBLY

CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

DTC B2059 Vehicle Speed Malfunction

DESCRIPTION

The distance control ECU uses the combination meter to send vehicle speed information to the ECM. The ECM and the skid control ECU use CAN communication to send vehicle speed information to the distance control ECU. This DTC is output when the difference between the vehicle speed information from the ECM and the skid control ECU exceeds the specified value.

DTC No.DTC Detection ConditionTrouble Area
B2059Difference between vehicle speed information from ECM and ABS & traction actuator assembly exceeds specified value
Combination meter assembly
ECM
Skid control ECU
Distance control ECU
Seat belt control ECU

INSPECTION PROCEDURE

  • NOTICE:
  • When the distance control ECU is replaced with a new one, initialization must be performed .
1.CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)

Delete the DTC .

Recheck for DTC.

  • OK:
  • DTC U0100, U0122 or U1101 is not output.
NG
GO TO CAN COMMUNICATION SYSTEM
OK
2.CHECK DTC OUTPUT (ENGINE CONTROL SYSTEM)

Delete the DTC .

Recheck for DTC.

  • OK:
  • DTC P0500 is not output.
NG
GO TO ENGINE CONTROL SYSTEM
OK
3.CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM)

Delete the DTC .

Recheck for DTC.

  • OK:
  • DTC C0200, C0205, C0210, C0215, C1235, C1236, C1238 or C1239 is not output.
NG
GO TO BRAKE CONTROL SYSTEM
OK
4.READ VALUE OF INTELLIGENT TESTER

Operate the intelligent tester according to the steps on the display and select the "Data List".

Combination Meter:
ItemMeasurement item / Range (Display)Normal ConditionDiagnostic Note
Vehicle Speed MeterVehicle speed / Min : 0 km/h (0 mph), Max: 255 km/h (158 mph)Almost same as actual vehicle speed (When driving)-
  • OK:
  • Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
NG
GO TO COMBINATION METER SYSTEM
OK
5.REPLACE DISTANCE CONTROL ECU ASSEMBLY

Replace the distance control ECU assembly .

NEXT
6.CHECK DTC OUTPUT (PRE-CRASH SAFETY SYSTEM)

Delete the DTC .

Recheck for DTC.

  • OK:
  • DTC B2059 is not output.
NG
REPLACE SEAT BELT CONTROL ECU
OK
END