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

    DATA LIST: ABS/VSC/TR(A)C 
    Item
    		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 (engine control system) (Click here for 3GR-FE or Click here for 3GR-FSE).

  1. Check the DTC (engine control system) (Click here for 3GR-FE or Click here for 3GR-FSE).

    Result:

    Condition
    		Proceed To
    DTC (engine control system) is not output
    		A
    DTC (engine control system) is output
    		B (Click here for 3GR-FE or Click here for 3GR-FSE)



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 that 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