Dtc C1201/51 Engine Control System Malfunction

Brake. Lexus Is250, Is220D. Gse20 Ale20
Brake Control. Lexus Is250, Is220D. Gse20 Ale20

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 Condition
Trouble Area
C1201/51
Engine control system malfunction signal continues for 5 seconds.
Engine control system

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here).
1.CHECK ENGINE CONTROL SYSTEM

  1. Check if the engine control system DTC is output (Click here).

    Result:

    Condition
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
INSPECT ENGINE CONTROL SYSTEM
A


2.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Condition
    		Proceed to
    DTC (C1201/51) is output
    		A
    DTC (C1201/51) is not output
    		B


B
USE SIMULATION METHOD TO CHECK
A


3.REPLACE ECM

  1. Turn the engine switch off.

  1. Replace the ECM (Click here).


NEXT


4.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Perform a road test.

  1. Check if the same DTC is recorded (Click here).

    Result:

    Condition
    		Proceed to
    DTC (C1201/51) is output
    		A
    DTC (C1201/51) is not output
    		B


B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY