![]() ![]() Still working on the graphics for the 95 and the 96+, and hope to have them finished up after we get back from the MN meet. The technician concludes that the engine coolant temperature (ECT) sensor or connecting wires are probably defective. In 96 when OBD II arrived the system changed to a single "Engine Coolant Temperature Sensor" on the thermostat housing that combined the functions of all the previous configurations, with one signal going directly to the gauge, and the other going to the PCM, which then controls the radiator fan and AC shutoff directly. Diagram is from quickserve by engine ESN number. ![]() I can just tap into another sensor for 5v supply but just wondering why is the diagram different to what is on the truck. The resistance of the sensor between the body of the sensor and the sensor connector tag should be 140 Ohm when cold. There is coolant behind the sensor, so you may want to drain some from the radiator before you remove it. "Number of wires" or wire colors also can't be reliably used to distinguish the different components.ĩ5 was sort of a bast-d oops! I mean oddball year in whcih some locations of the components started to change. Wiring diagram shows 5v sensor supply to come from pin 21 on ecu oem connector but pin 21is empty on our ecu. Unplug the harness connector from the sensor, and verify that it has the same number of wires as the new one you bought. Then there's the Radiator Fan Thermostat switch in the thermostat housing that is the only component that was named in a way that shouldn't be confusing when it's proper name is used. General Information On New Cascadiavehicles, depending on the tension applied to the harness located at the coolant levelsensor and its mounting locations, wiring damage can occur, resulting in one or more of the below listed faultcodes. You require some materials to replace a coolant temperature sensor. You can't say "it" and "CTS" in the same sentence without clarifying which "CTS It" you are referring to, since there are three components on the 94 and earlier with the words "Engine Coolant Temperature." in the name. A trinary switch will allow your electric fan to turn on and off based on either engine temperature or AC. Three words that should never be used alone when referring to Metro components without expecting confusion. How to wire an electric fan with an AC trinary switch. Go to an online service information provider like ALLDATA or Mitchell On-Demand or equivalent and download the wiring diagram for ECT for the vehicle you are working on. ![]()
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