southside Posted May 25, 2017 Share Posted May 25, 2017 i have a 1996 mack ch613 with a e7, I went to a fuel station to fuel up and when I went to turn it on it wouldn't start. it cranks but wont start and when I plug in the scan tool it wont communicate as if its not getting ignition power, put a brand new ecm and still nothing. it does start with starting fluid but dies right away, all fuses are good, cant seem to find the power relay to make sure that's all good, checked all the wiring from all sensors to the computer and all of them are good. if anyone can help that would be much appreciated. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 25, 2017 Share Posted May 25, 2017 Jump across the big solinoid in the fuse box ( assuming its a pre-ETECH truck). That should power up both ECM's Quote Link to comment Share on other sites More sharing options...
southside Posted May 25, 2017 Author Share Posted May 25, 2017 its getting power on both sides with the key on. and what do u mean both ecm's? theres only one. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 25, 2017 Share Posted May 25, 2017 I forgot, being a 96 it's a VMAC-2 with 1 ECM. I have attached the VMAC-2 troubleshooting service manual but sadly there is no "Crank no start" troubleshooting info in it like the VMAC1 and 3 manuals. It does have some ECM info in there though. VMAC 2 manual.pdf Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 25, 2017 Share Posted May 25, 2017 If you ever get th ECM to power up. There is a big cap nut on the front of the fuel pump that faces the fan . . It is 1 " or bigger. Remove it and stick your finder in the hole. Turn key on and push throttle pedal to the floor, you should feel the rack push your finger . Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 25, 2017 Share Posted May 25, 2017 I have seen starter draw to high and pull voltage away from ECM and cause crank no start. Check volts at ECM durning cranking. Needs around 9.5 volts min to start. Quote Link to comment Share on other sites More sharing options...
southside Posted May 25, 2017 Author Share Posted May 25, 2017 do you have any idea why I cant connect a scan tool to it? and the blink code doesn't work Quote Link to comment Share on other sites More sharing options...
southside Posted May 25, 2017 Author Share Posted May 25, 2017 Are there any other fuses or relays somewhere else? Or any inline fuses? Quote Link to comment Share on other sites More sharing options...
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