DoubleFrame Posted March 9, 2023 Share Posted March 9, 2023 Hey guys I hope to find some help here. I have a 2006 CV713 that is not starting. I have found that when I push down on the top harness plug on the ECM the truck starts right up. I’m trying to figure out which cable is bad, does anyone have a pin diagram for the ECM? The harness is on national back order! Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/ Share on other sites More sharing options...
Joey Mack Posted March 10, 2023 Share Posted March 10, 2023 before you spend money... you can unplug them and inspect for defects. If no defects are found, you can use a sewing needle, ( if you dont have a probe kit) to tighten the female terminals in the EECU plug.. Do not try to bend the male pins in the EECU. This will also give you the oportunity to see if any of the terminals in the plug have loosened up and pushed back out of the way.. A magnifying glass and some patience are good tools to have for this.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-526870 Share on other sites More sharing options...
DoubleFrame Posted March 10, 2023 Author Share Posted March 10, 2023 Thanks Jojo just tried that but in my trouble shooting I have discovered that when I touch the ECM to the intake manifold I am able to start up the truck. It seems to be a ground cable that hours to the ecm. Not sure which one is it yet. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-526874 Share on other sites More sharing options...
Joey Mack Posted March 10, 2023 Share Posted March 10, 2023 OK,, well one thing we used to do while ghost hunting was to make up a ground wire with a #12 or #10 wire and 2 eyelets and put one end under an EECU mounting nut, and ground it to the engine.. is the EECU mounted securely or is it loose and able to bounce or bang around? if so, tighten it up.. I respect the fact that you want to find the bad ground. You should check all the engine and cab grounds too. do you know where they are? jojo 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-526875 Share on other sites More sharing options...
Solution DoubleFrame Posted March 10, 2023 Author Solution Share Posted March 10, 2023 I ran a ground cable from the top of the ECM mounting bolt to the frame and she starts right up. I believe I found the broken cable on the engine ground below the starter. I’m getting ready to fix that now and just need to buy a bigger connector because there are like 5 cables to that ground connection. Thank you for your help. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-526905 Share on other sites More sharing options...
fjh Posted March 10, 2023 Share Posted March 10, 2023 33 minutes ago, DoubleFrame said: I ran a ground cable from the top of the ECM mounting bolt to the frame and she starts right up. I believe I found the broken cable on the engine ground below the starter. I’m getting ready to fix that now and just need to buy a bigger connector because there are like 5 cables to that ground connection. Thank you for your help. I recommend you Take all the grounds off the block and polish up the eyelets through away the star washers and cinch it down tight! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-526906 Share on other sites More sharing options...
R.E.D Posted March 14, 2023 Share Posted March 14, 2023 While you have the plugs off, check for signs of coolant or oil seepage. The coolant or oil sensors go bad and allow the wiring lining to be used as a hose. The coolant especially will react with the electricity and create kind of a electrolysis and corrode your male connector pins. Had this happened to me once. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72587-ecm-harness-issue/#findComment-527221 Share on other sites More sharing options...
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