DTC    C1201/51    Engine Control System Malfunction

for Preparation Click here


DESCRIPTION

If a malfunction in the engine control system is detected, the operations of VSC and TR(A)C 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.
INF Code
DTC Detection Condition
Trouble Area
C1201/51
-
The engine malfunction signal continues to be received for 5 seconds or more.
Engine control system

INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)

  1. Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (Click here).

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    EFI Communication Open
    		EFI communication open detection / ERROR or NORMAL
    		ERROR: Momentary interruption
    NORMAL: Normal

    OK:
    There are no momentary interruptions.

    HINT:
    Perform the above inspection before removing the sensor and connector.



NG
Go to step 3
OK


2.CHECK DTC FOR ENGINE CONTROL SYSTEM

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result:

    Condition
    		Proceed To
    DTC (engine control system) is not output
    		A
    DTC (engine control system) is output
    		B (Click here)



B
REPAIR ENGINE CONTROL SYSTEM ACCORDING TO DTC OUTPUT
A

REPLACE ECM 

3.REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM TO SKID CONTROL ECU)

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 not output
    		A
    DTC (C1201/51) is output
    		B



B
Go to step 2
A

END