The wait light stays on due to the fact that the GP card is not seeing any resistance from the sensor. When you disconnected the sensor you have created an "open" circuit. Opens are high in resistance.I know the basic operation, but don't understand what is going on when something goes bad. Why does the wait light stay on with the temp sensor removed? I have another truck that has manual glow plugs and the wait light goes off on on randomly(GP card removed) as you're driving. Things like that I don't understand. When something isn't working right, it would seem there should be a certain cause and effect (with this glow plug system it is hard for me to figure out). That is what I look for, and eventually I replace the bad part.
Either the sensor is defective or the wiring is defective.Is it a good guess that the temp sensor is bad because the temp sensor is not showing any resistance when it is plugged in and the engine is cold? I will know tomorrow because will pick up the one I ordered from Napa.
I see what you mean.antennaclimber, I think I know what you mean, but you said that no resistance = open circuit. If the circuit has no resistance as in closed circuit the wait light won't come on. High resistance the wait light will stay on.
The chart is the product of testing a new temperature sensor for the CUCV trucks. We measured the resistance of the actual sensor and plotted it to produce the graph.Is the chart for the actual glow plug temp sensor or just Representative of a thermistor function? I suspect the sensor on my truck is the cause for the glow plugs to continue to turn on after the truck should be warm enough. I can hear the relay click on/off sometimes intermitant like a bad connection.
Ok, since it was not labeled I was just making sure, I needed the resistance value to test against the one in my truck.The chart is the product of testing a new temperature sensor for the CUCV trucks. We measured the resistance of the actual sensor and plotted it to produce the graph.
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