03 rincon
Jul 6, 2008 | 03:40 PM
#2
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03 rincon
Welcome to the forum.
So the overheat light comes on immediately and stays on (beyond the secod or so for bulb test), even though the engine is cold?
The coolant temp sensor is located on the back of the head, below the intake manifold if I recall correctly. Try unhooking that sensor, and turn the machinie on. If the overheat light blinks on for a minute when you first turn the key on, then goes out, that coolant sensor is probably defective.
If on the other hand the overheat light stays on, there is an oil temp sensor. If you look at where the oil fill is and follow that tube to where it runs into the crank case, the sensor is right there. Try unhooking that one and turn the machine on. If the light comes on (bulb test) then goes off, I'd suspect that sensor is bad.
If the temp light still comes on and stays on with both sensors disconnected, I'd start looking for a short or damaged area in the wiring harness... You could unhook the battery, and the plug at the ECM and check for short to ground on both sensor wires...
If unhooking the coolant sensor makes the light go out, you can test the coolant sensor to verify that was the problem. Drain the coolant and remove the sensor. Put the sensor tip in a pan of engine coolant, along with a thermometer. When temp is 176f you should have 49-55 k ohm, and at 212f it should be 27-28 ohm.
If it was unhooking the oil temp sensor that made the light go off, it can be tested in a similar way. Drain the oil, remove the sensor, and suspend it in a pan of motor oil with multi-meter leads. 3.3 to 3.7 k ohm at 77f, and 95-112 ohms at 302 f.
Good luck with it, and post back how it turns out.
So the overheat light comes on immediately and stays on (beyond the secod or so for bulb test), even though the engine is cold?
The coolant temp sensor is located on the back of the head, below the intake manifold if I recall correctly. Try unhooking that sensor, and turn the machinie on. If the overheat light blinks on for a minute when you first turn the key on, then goes out, that coolant sensor is probably defective.
If on the other hand the overheat light stays on, there is an oil temp sensor. If you look at where the oil fill is and follow that tube to where it runs into the crank case, the sensor is right there. Try unhooking that one and turn the machine on. If the light comes on (bulb test) then goes off, I'd suspect that sensor is bad.
If the temp light still comes on and stays on with both sensors disconnected, I'd start looking for a short or damaged area in the wiring harness... You could unhook the battery, and the plug at the ECM and check for short to ground on both sensor wires...
If unhooking the coolant sensor makes the light go out, you can test the coolant sensor to verify that was the problem. Drain the coolant and remove the sensor. Put the sensor tip in a pan of engine coolant, along with a thermometer. When temp is 176f you should have 49-55 k ohm, and at 212f it should be 27-28 ohm.
If it was unhooking the oil temp sensor that made the light go off, it can be tested in a similar way. Drain the oil, remove the sensor, and suspend it in a pan of motor oil with multi-meter leads. 3.3 to 3.7 k ohm at 77f, and 95-112 ohms at 302 f.
Good luck with it, and post back how it turns out.
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