Dtc C1203 Ecm Communication Circuit Malfunction


DESCRIPTION

INSPECTION PROCEDURE

CHECK ENGINE TYPE

CHECK DTC (ENGINE CONTROL SYSTEM)

CHECK DTC (ENGINE CONTROL SYSTEM)

CHECK DTC (ENGINE CONTROL SYSTEM)

DTC C1203 ECM Communication Circuit Malfunction


DESCRIPTION

The circuit is used to send control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU via the CAN communication system.

DTC Code
DTC Detection Condition
Trouble Area
C1203
The engine/drivetrain specification and/or destination information from the ECM does not match the skid control ECU data.
ECM

INSPECTION PROCEDURE

1.CHECK ENGINE TYPE
  1. Check the engine type.

    Result
    Result
    Proceed to
    1GR-FE
    A
    1KD-FTV
    B
    1GD-FTV
    C



B
Go to step 3

C
Go to step 4
A


2.CHECK DTC (ENGINE CONTROL SYSTEM)
  1. Check if an engine control system DTC is output (LandCruiser RM000000PDK1DIX.html).

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



B
GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (LandCruiser RM000002ZSO015X.html)
A

REPLACE ECM (LandCruiser RM00000329203TX.html)

3.CHECK DTC (ENGINE CONTROL SYSTEM)
  1. Check if an engine control system DTC is output (LandCruiser RM000000PDK1DJX.html).

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



B
GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (LandCruiser RM0000031HW07LX.html)
A

REPLACE ECM (LandCruiser RM0000013Z002CX.html)

4.CHECK DTC (ENGINE CONTROL SYSTEM)
  1. Check if an engine control system DTC is output (for 1GD-FTV (w/ Urea SCR System): LandCruiser RM000000PDK1E5X.html, for 1GD-FTV: LandCruiser RM000000PDK1ENX.html).

    Result
    Result
    Proceed to
    DTC is not output
    A
    DTC is output (for 1GD-FTV (w/ Urea SCR System))
    B
    DTC is output (for 1GD-FTV)
    C



B
GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (LandCruiser RM0000031HW07OX.html)

C
GO TO ENGINE CONTROL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART) (LandCruiser RM0000031HW07PX.html)
A

REPLACE ECM (LandCruiser RM0000013Z002DX.html)