Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL

DESCRIPTION

INSPECTION PROCEDURE

CHECK ENGINE CONTROL SYSTEM

RECONFIRM DTC

REPLACE ECM

RECONFIRM DTC

DTC C1201/51 Engine Control System Malfunction

DESCRIPTION

If a malfunction in the engine control system is detected, the operations of VSC and TRC are prohibited by the fail safe function. When the signals from the engine are input normally, the fail safe is cancelled and the DTC is not stored.

DTC No.DTC Detection ConditionTrouble Area
C1201/51Engine control system malfunction signal continues for 5 seconds.Engine control system

INSPECTION PROCEDURE

  • NOTICE:
  • When replacing the brake actuator assembly, perform zero point calibration .
1.CHECK ENGINE CONTROL SYSTEM

Check if the engine control system DTC is output ( for gasoline, or for diesel).

  • Result:
  • ConditionProceed to
    DTC is not outputA
    DTC is outputB
B
INSPECT ENGINE CONTROL SYSTEM
A
2.RECONFIRM DTC

Clear the DTC .

Perform a road test.

Check if the same DTC is recorded .

  • Result:
  • ConditionProceed to
    DTC (C1201/51) is outputA
    DTC (C1201/51) is not outputB
B
USE SIMULATION METHOD TO CHECK
A
3.REPLACE ECM

Turn the engine switch off.

Replace the ECM ( for gasoline, or for diesel).

NEXT
4.RECONFIRM DTC

Clear the DTC .

Perform a road test.

Check if the same DTC is recorded .

  • Result:
  • ConditionProceed to
    DTC (C1201/51) is outputA
    DTC (C1201/51) is not outputB
B
END
A
REPLACE BRAKE ACTUATOR ASSEMBLY
LEXUS IS250, IS220d / GSE20 ALE20
BRAKE CONTROL
Lexus IS250 IS220d GSE20 ALE20
VEHICLE STABILITY CONTROL SYSTEM w/o VDIM