Dtc B2059 Vehicle Speed Malfunction

Restraints. Lexus Is250, Is220D. Gse20 Ale20
Pre-Crash Safety. Lexus Is250, Is220D. Gse20 Ale20

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 Condition
Trouble Area
B2059
Difference between vehicle speed information from ECM and ABS & traction actuator assembly exceeds specified value
  1. Combination meter assembly
  2. ECM
  3. Skid control ECU
  4. Distance control ECU
  5. Seat belt control ECU

INSPECTION PROCEDURE

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

  1. Delete the DTC (Click here).

  1. 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)

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    OK:
    DTC P0500 is not output.


NG
GO TO ENGINE CONTROL SYSTEM
OK


3.CHECK DTC OUTPUT (BRAKE CONTROL SYSTEM)

  1. Delete the DTC (Click here).

  1. 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

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

    Combination Meter:
    Item
    		Measurement item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    Vehicle Speed Meter
    		Vehicle 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

  1. Replace the distance control ECU assembly (Click here).


NEXT


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

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    OK:
    DTC B2059 is not output.


NG
REPLACE SEAT BELT CONTROL ECU
OK

END