Lexus IS250 IS220d GSE20 ALE20 - BRAKE CONTROL

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 skid control ECU, perform zero point calibration and store system information .

1.CHECK ENGINE CONTROL SYSTEM

Check if the engine control system DTC is output .

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

INSPECT ENGINE CONTROL SYSTEM

A

2.RECONFIRM DTC

Clear the DTC .

Perform a road test.

Check if the same DTC is recorded .

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

USE SIMULATION METHOD TO CHECK

A

3.REPLACE ECM

Turn the engine switch off.

Replace the ECM .

NEXT

4.RECONFIRM DTC