Isuzu 4hl1 Engine Wiring Diagram Zip !LINK!
if there is no voltage from the ect sensor circuit, check for voltage and ground at the fuel pressure regulator. if there is no ground, check for voltage and ground at the fuel pressure regulator. if there is no ground, test power supply relays and fuses following the wiring diagram derived from the vehicle information source. if there is no voltage, check for open fuses, one at the fuel pump connector and one at the ect sensor connector. if there is a ground, check for open fuses, one at the fuel pump connector and one at the ect sensor connector.
isuzu 4hl1 engine wiring diagram zip
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if engine coolant temp sensor is giving you error code p0118, the problem could be: the engine coolant temperature sensor has failed. this is an expensive and difficult repair because the sensor itself is expensive and difficult to get at. if you have a volkswagen engine, the coolant temp sensor is located in the radiator hose under the left front fender. if you have an audi engine, the coolant temp sensor is located on the left side of the engine block behind the water pump. the coolant temperature sensor on a vw engine looks like an arrow with a long stem. the coolant temperature sensor on an audi engine looks like a plus sign with a stem.
the engine coolant temperature sensor cable is broken. the coolant temperature sensor cable is a small thin wire and is located inside the engine coolant lines. this is an inexpensive repair.
the engine coolant temperature sensor is dirty. dirt or water can block the sensor so the engine computer thinks the engine is overheating even though the engine is not.
the engine coolant temperature sensor is disconnected. the engine coolant temperature sensor is located in the engine block and has a cable going to the radiator hose. to check if the sensor is disconnected, turn the engine on and observe if the engine coolant temperature is increasing. if the engine coolant temperature is increasing, then the engine coolant temperature sensor is disconnected.