Shortdawg67 Posted July 19, 2023 Share Posted July 19, 2023 2007 Mack vision cxn613 ASET C 380 engine Flash code 9-2 power reset without key switch My truck has no power as I turn the key in the ignition. Anybody know how to troubleshoot and solution to this?? Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/ Share on other sites More sharing options...
Joey Mack Posted July 20, 2023 Share Posted July 20, 2023 You need to clean ALL the grounds, starting at the batteries. I bet the ground bolt on the block in front of the starter is loose.. the svc. Bulletin for 9-2 has the steps. Or you can look it up in my posts and find the book I wrote on it.. :). 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535221 Share on other sites More sharing options...
Mackpro Posted July 20, 2023 Share Posted July 20, 2023 What Joey said and also here’s the service bulletin on it . https://f01.justanswer.com/HeavyEquipmentTech/08b3b0a9-699e-422a-b834-ba684bc06d37_Mack_fault_9-2.pdf 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535226 Share on other sites More sharing options...
JoeH Posted July 20, 2023 Share Posted July 20, 2023 You need to open your fuse box and check the EECU fuse for looseness. That's why my '03 wouldn't start for a few days. Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535237 Share on other sites More sharing options...
Joey Mack Posted July 20, 2023 Share Posted July 20, 2023 Fuse #40 Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535239 Share on other sites More sharing options...
JoeH Posted July 20, 2023 Share Posted July 20, 2023 My mr688 would crank but not start. I'm guessing yours is the same because you are getting enough power to the key to give you the 9-2 code. If yours won't crank then you may have a power fault somewhere else, maybe the ignition itself. Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535244 Share on other sites More sharing options...
Shortdawg67 Posted July 20, 2023 Author Share Posted July 20, 2023 The truck eventually stopped the one crank it gave before it stopped and showed no power. The power never came back. I’ve turned it in to the shop and they have said my ECM has no power. They put a test module/ one of their own and my truck started right up. They told me let’s go ahead and rebuild the ECM and I agreed.mind you I bought this ECM July 2021 I’m appalled that what I feel like is still a new ECM(to me) has gone bad and needs to be rebuilt… Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535280 Share on other sites More sharing options...
Joey Mack Posted July 20, 2023 Share Posted July 20, 2023 I agree about the newer ECM.. Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535283 Share on other sites More sharing options...
JoeH Posted July 20, 2023 Share Posted July 20, 2023 Bad batteries?... EECU won't turn on with low voltage, I forget what the minimum voltage requirement is. If your batteries are toast or alternator died then I could see you lose EECU power and also lose crank... But I've only got experience with the one computer truck. Our other trucks are mechanical. Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535301 Share on other sites More sharing options...
Joey Mack Posted July 20, 2023 Share Posted July 20, 2023 10.5v ish... I have used a seperate battery grounded to the truck and a lead from the positive to fuse #40 in the EPDM and got a Mack to start and run.. This was to diagnose a similar ''will crank, but wont startup'' complaint... It turned out that the starter was pulling too much power and it was starving the EECU.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535302 Share on other sites More sharing options...
Shortdawg67 Posted July 20, 2023 Author Share Posted July 20, 2023 Yesterday I checked each of my batteries (3 only) worth a battery tester and they all showed about 13ish volts separately so the batteries were good. I myself and a couple of my owner operating buddies checked the fuses in that little box on the driver side hood, also in front of the passenger seat that compartment and by the passenger sides feet. It did seem like no power was happening from or around the ECM. Then I got todays news, which was what I shared with you guys today a few hours ago. The ECM is currently being rebuilt I should have my semi back by tomorrow. Just hoping THAT really was the issue and not the alternator or starter or something. You know when you go to the doctor and show symptoms and you figure out the solution? Problem solved hopefully 🥲🥲 Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535305 Share on other sites More sharing options...
Joey Mack Posted July 20, 2023 Share Posted July 20, 2023 Good Luck to you !!! Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535307 Share on other sites More sharing options...
JoeH Posted July 21, 2023 Share Posted July 21, 2023 Hope ecm solves it. Any time I check batteries I check resting voltage, then have a helper try cranking it while I'm watching the test voltmeter. My car battery started being unreliable the past couple months. Voltage always tested good, but it was losing cranking amps for some reason. Left me stranded a couple times before I ponied up for a new one. Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535322 Share on other sites More sharing options...
doubleclutchinweasel Posted July 21, 2023 Share Posted July 21, 2023 15 hours ago, JoeH said: Hope ecm solves it. Any time I check batteries I check resting voltage, then have a helper try cranking it while I'm watching the test voltmeter. My car battery started being unreliable the past couple months. Voltage always tested good, but it was losing cranking amps for some reason. Left me stranded a couple times before I ponied up for a new one. That "load test" will frequently show you a bad battery that the static test won't. Great tip, Joe! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535352 Share on other sites More sharing options...
Shortdawg67 Posted July 21, 2023 Author Share Posted July 21, 2023 I will definetly be changing out my batteries before the winter comes. The ECM has been rebuilt and my truck has started right up. I’m still flabbergasted about this ECM only being 2 years old and already needing a rebuild. Could a short cause this to damaging the ECMs power?? Quote Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535355 Share on other sites More sharing options...
doubleclutchinweasel Posted July 21, 2023 Share Posted July 21, 2023 That's not much life, considering the cost, for sure. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/73064-vmac-iii-9-2-lightning-flash-code/#findComment-535361 Share on other sites More sharing options...
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