ACG Posted March 24, 2016 Share Posted March 24, 2016 Please can I get some help? 2007 Mack cxn613 reading code 88. Truck won't crank. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted March 24, 2016 Share Posted March 24, 2016 None of my books have a 8-8 code, it jumps from 8-6 to 8-9. An 8-9 is a shorted EUP or EUP harness shorted. I usually start by removing all 3 Engine ECM connectors and cheking for oil or antifreeze in harness and bad or missing pins . If all ok there I then remove all the wires from the EUP's and check OHM's reading across the 2 EUP post , all 6 EUP's should read the same. Replace any that are way off. Quote Link to comment Share on other sites More sharing options...
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