4. Diagnosis 4-1. DTC (Diagnostic Trouble Code) Table A HINO PC tester can be used at the HINO dealership to display DTCs and perform diagnostic troubleshooting on the significantly changed items. The DTCs (to be dealt with at the HINO dealership) are shown below for reference. -13- DTC P Code _ DST-1 display Code explanation Reference 31 P0047 VNT solenoid valve 1 malfunction VNT solenoid valve 1 is abnormal. There could be a solenoid valve malfunction, harness open circuit, or ground short. 31 P0048 VNT solenoid valve 1 malfunction VNT solenoid valve 1 is abnormal. There could be a harness +B short. 39 P0049 Turbo speed overrun An abnormally high turbo speed is detected.
Detected by turbine rotation sensor 76 P0088 Abnormally high rail pressure An abnormally high fuel pressure is detected. 78 P0093 Fuel leak There could be a fuel leak. Perform a fuel leak check. Conventional pump cannot pump (fuel discharge) 88 P0096 EGR valve seizure malfunction The EGR system is abnormal Valve is detected through EGR gas temperature to have seized in the fully closed position 18 P0097 EGR gas temperature sensor malfunction (LO) Cannot detect the temperature normally. There could be a sensor malfunction or a har- ness ground short. 18 P0098 EGR gas temperature sensor malfunction (HI) Cannot detect the temperature normally.
There could be a sensor malfunction, harness open circuit or +B short. 17 P0102 Air flow sensor malfunction (LO) The air flow sensor is abnormal. There could be a sensor malfunction, harness open circuit or GND short. 17 P0103 Air flow sensor malfunction (HI) The air flow sensor is abnormal. There could be a sensor malfunction or a harness +B short. 37 P0108 Boost pressure sensor malfunc- tion (HI) Cannot detect the boost pressure normally. There could be a sensor malfunction or har- ness short. 16 P0112 Intake air temperature sensor malfunction (LO) Cannot detect the temperature normally. There could be a sensor malfunction or a har- ness ground short.
Air flow sensor inter- nal sensor 16 P0113 Intake air temperature sensor malfunction (HI) Cannot detect the temperature normally. There could be a sensor malfunction, harness open circuit or +B short. Air flow sensor inter- nal sensor 11 P0117 Coolant temperature sensor mal- function (LO) Cannot detect the temperature normally. There could be a sensor malfunction or a har- ness ground short.