Matt king Posted March 5, 2018 Share Posted March 5, 2018 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 Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/ Share on other sites More sharing options...
hatcity Posted March 5, 2018 Share Posted March 5, 2018 last time I had to change mine, had to get a new plug....some kind of BS Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-393491 Share on other sites More sharing options...
turckster Posted March 7, 2018 Share Posted March 7, 2018 Depends what the FMI is of that fault. It could be a short to ground, open circuit, short to power. The FMI will tell you that and from there you can begin your approach to diagnosing. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-393569 Share on other sites More sharing options...
305Mack Posted November 21, 2018 Share Posted November 21, 2018 what is the FMI ? where is it located. Thanks for your help Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-409752 Share on other sites More sharing options...
turckster Posted November 23, 2018 Share Posted November 23, 2018 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. Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-409876 Share on other sites More sharing options...
wilbur Posted December 2, 2018 Share Posted December 2, 2018 Antifreeze will seep through the sensor through the plug and into the wires. Get a new plug and splice as far away from plug as you can. Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-410535 Share on other sites More sharing options...
305Mack Posted January 9, 2019 Share Posted January 9, 2019 I’m having the same problem.. any suggestions as to what it caan be ? Or what to look for ?? Tia Quote Link to comment https://www.bigmacktrucks.com/topic/52707-coolant-level-sensor-code-1-7/#findComment-412782 Share on other sites More sharing options...
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