1E-16 Electronic control fuel injection system (Common rail type) Data link connector (DLC) How to read DTC The data link connector is communication device with control unit. The DLC is also used to connect a scan tool. General use of scan tool is described below. How to read DTC by diagnosis lamp The diagnosis lamp blinks to indicate the current and history trouble codes (DTCs) stored in ECM by connecting the diagnosis switch. Note: The location of DLC and existence of DLC vary depending on each machine. Refer to the machine’s manual. Note: Refer to the machine’s manual for the locations of diagnosis lamp.
Identification of stored DTC Reading of serial data Turn the key switch to ON and make sure the diagnosis lamp illuminates. (Bulb check) Turn the key switch to ON, and the engine OFF. Connect the diagnosis switch (connector). Read the blinking pattern of the diagnosis lamp. Judge the contents of DTC by DTC table. If a scan tool has been connected, it can be read using the tool. About ECM OFF The power of ECM is cut off 10 seconds after the key switch is turned to OFF, and then it will be ECM OFF condition. Operation of comprehensive diagnosis for monitors of components It is necessary to comprehensively diagnose components for the proper operation of the engine.
Indication with no DTC stored The code “1”, which indicates starting of code display, is repeatedly displayed. Input components: Input components are confirmed to check if there are open circuit and the values exceed the range. Though the following does not include all input components, these sensors are included. Crankshaft position (CKP) sensor G sensor Engine coolant temperature (ECT) sensor Vehicle speed sensor Boost pressure sensor Common rail pressure sensor Accelerator position (AP) sensor Indication with DTC stored Stored trouble code is displayed three times. If more than one trouble code are stored, they are displayed in the ascending order for three times each.
After taking a round, codes are repeatedly displayed in the ascending order. This will last as long as the diagnosis connector is connected. Output components: Output components are diagnosed if their responses to commands from control units are relevant. Check whether there are open circuit and the values exceed the range. Though the following does not include all the output components to be confirmed, these circuits are included. Pressure control valve (PCV) Lamp, relay control Magnetic valve Diagnosis lamp