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Coolant level sensor code 1-7


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I have a 1993 Mack RD 690 S AND is is giving me a code of 1-7 which is the coolant level sensor changed it and code will not go away. Any help would be greatly appreciated. I put two sensors in thinking I got a defect but same problem occur

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On 11/21/2018 at 7:47 AM, 305Mack said:

what is the FMI  ? where is it located. Thanks for your help 

FMI means Failure Mode Identifier, it tells you the actual failure be it short to ground, open circuit, erratic response and so forth. You have to use a diagnostic device(computer or Pro-Link) to see what the FMI is. For example, if the FMI is open circuit (FMI:5) then you know that somewhere in the circuit there is a damaged wire. You would look for obvious rub points or damaged areas in the wiring. 

Take a good look at the sensor connector's terminals and make sure they making good contact and are not corroded. I've seen wires break inside the insulation at the connectors because of vibration so check for that as well. 

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