Jessica Posted November 14, 2022 Share Posted November 14, 2022 This truck will not start. It can be jump-started, but will not turn over when cranked. Think it may be a combination of issues, but we took out the entire wire harness and checked all the wires, everything is fine there. Truck shows a couple fault codes, but will not let me read the fault codes for the engine for some reason. I can read the other ones. Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/ Share on other sites More sharing options...
Mackpro Posted November 15, 2022 Share Posted November 15, 2022 (edited) Using the stalk switch on the right side of the steering column. Go through the display screen till you see “Trip Info “. Enter into the Trip Info and you will see Trip1 and Trip2 and engine hours. Go into Engine Hours . If all you see is dashes then the Engine ECM is not powering up . Possibly bad engine ecm or low voltage/bad ground to the engine ecm . Edited November 16, 2022 by Mackpro 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515167 Share on other sites More sharing options...
Onyx610 Posted November 15, 2022 Share Posted November 15, 2022 Also if this is the case then the engine wouldn't crank over since the eecu provides ground for the starter relay. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515168 Share on other sites More sharing options...
Joey Mack Posted November 15, 2022 Share Posted November 15, 2022 Really????? Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515169 Share on other sites More sharing options...
Onyx610 Posted November 15, 2022 Share Posted November 15, 2022 Protects the starter from overheating. If the eecu sees excessive crank time it knocks off the ground circuit for the starter relay for about 30 seconds. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515170 Share on other sites More sharing options...
Onyx610 Posted November 15, 2022 Share Posted November 15, 2022 (edited) Batteries good? Connections good? Edited November 15, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515171 Share on other sites More sharing options...
fjh Posted November 15, 2022 Share Posted November 15, 2022 12 hours ago, Onyx610 said: Protects the starter from overheating. If the eecu sees excessive crank time it knocks off the ground circuit for the starter relay for about 30 seconds. Yup this safety feature proudly presented by Volvo to preserve the starter for after the injector cup jobs!😂 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70705-2012-mack-chu-no-start-electrical-problem/#findComment-515191 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.