Kubota WG1605-E3, Руководство по диагностике

Страница: 155 / 241

ECM SYSTEM
WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
1-145
The Engine Coolant Temperature sensor is a thermistor (temperature sensitive resistor) located in the engine
coolant. The ECT is used for engine fuel calculation (cold engine), ignition timing control, to enable certain features,
and for engine protection (overheats). The ECM provides a voltage divider circuit so when the sensor reading is cool
the sensor reads higher voltage, and lower when warm.
The fault of DTC 116 and DTC 217 will help protect the engine in the event of over temperature.
The ECM will use a default value for the ECT sensor in the event of the faults of DTC 117 or DTC 118.
DTC 116-ECT Higher Than Expected Stage 1
Diagnostic Aids
• If the "ECT High Voltage" fault is also present, follow the troubleshooting procedures for that fault as it may have
caused "ECT Higher Than Expected 1".
• If the cooling system utilizes an air-to-water heat exchanger (radiator) and fan:
– Check that the radiator has a proper amount of ethylene glycol/water and that the radiator is not leaking
– Ensure that there is no trapped air in the cooling path
– Inspect the cooling system (radiator and hoses) for cracks and ensure connections are leak free
– Check that the fan is operating properly
– Check that the thermostat is not stuck closed
• If the cooling system utilizes a water-to-water heat exchanger:
– Check that the heat exchanger has a proper amount of ethylene glycol/water and that the heat exchanger is
not leaking
– Ensure that there is no trapped air in the cooling path
– Inspect the cooling system (radiator and hoses) for cracks and ensure connections are leak free
– Check that the raw water pickup is not blocked/restricted by debris and that the hose is tightly connected
– Check that the thermostat is not stuck closed
– Check that the raw water pump/impeller is tact and that it is not restricted
KiSC issued 12, 2016 A