Just like other person said. Plug for sensor . Some place the wire is rubbed through ot plug is bad.
Low coolant warning light and bell...
Discussion in 'Kenworth Forum' started by nomad3d, Apr 16, 2016.
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Last edited: Apr 19, 2016
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At this point I think the only way to fix our demon Pete 579 is introducing it to Mr. Sledgehammer. This brain numbing dinging is just the latest electrical malfunction to grace us. 5 replaced SmartNav screens, countless faulty sensors, and a GPS that has never worked - causing weeks of shop time - that even Rush can't figure out... Nothing puts you into a financial hole quicker than an ecm lemon.
GoBucks43228 and Oldironfan Thank this. -
If low coolant light is on and sensor/wiring has been checked, your problem is the surge tank itself. There is a "floating" metal slug that the sensor reads. That gets stuck. Only fix is to replace tank. Bad Paccar design. I have done many.
D.Tibbitt, 98 star car and Oldironfan Thank this. -
Did you ever get this problem fixed? On mine, it turned out to be the new sensor I bought was bad as well. I replaced it with another new one and it's fine now. Thankfully, cause the constant dinging was driving me mad...
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Just had this issue fixed by peterbilt. If sensor is bad, so is surge tank.
Happens around 300,000. And again at 600,000 miles about.
Modern technology is useless. -
Unplug the sensor. Should be three wires in the plug. One will have 5 volts, one is ground(usually the white wire), and the other sends 1.5 volts or so to the ecm. Take a 200K ohm resistor and jump it from the 5 volt source to the return source wire and it should be a constant 1.6 volts going to the ecm. Don’t plug the sensor up because if it’s shorted it will up the voltage from the jumper and still shut the engine down. If this doesn’t work then you have a break in the wire somewhere between the plug and the ecm.
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I've had the same issue on two different ISX. Both times ended up replacing the surge tank
D.Tibbitt Thanks this. -
I bough a new sensor off the net. No more dinging.
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