Jump to content
Sign in to follow this  
PatrickJ07

2011 CXU600 no crank no start

Recommended Posts

2011 Mack CXU600
1M1AW02YXBM015137
Eaton 8 speed

Customer states truck would intermittently not start, said driver could wiggle ECM connector and got it to start once. Pulled into shop and check all the fuses, all were ok. confirmed is would not start. wiggled on harness for a while and was unable to get truck to turn over. un plugged and checked connectors and all were ok. sometimes it would just start to engage the starter then stop. checked and confirmed I am getting power to starter, confirmed soft start works. can ground out soft start and truck will TURN right over but no start. wiring diagram shows a starter relay control driver circuit to ground out starter relay directly form ECM. it is not sending signal to ground. checked circuit for shorts to power, ground, resistance, load tested and even ran a temporary new circuit to no avail. I do now know the logic behind this starting system, un plugged and checked the oil temp sensor as I read this could cause it as well. anyone else run into this issue? customer is insisting it is the engine wiring harness but I'm hard pressed to just replace parts. checked for codes and have codes. INFORMATION DISPLAY PPID 278 Aftertreatment Reagent level FMI 9 abnormal update rate, active, 1 count. INFORMATION DISPLAY PSID 200 data link MID 128, FMI 9 abnormal update rate, active, 1 count. VECU PSID 200 data link MID 128, FMI 9 abnormal update rate, active, 5 counts.

Share this post


Link to post
Share on other sites

I only work on mechanical engines. Any time I run into a no crank situation I check the relay in the dash that sends signal power to the starter relay. They're junk lately, I only seem to get a year or so out of them before I have issues with the internal contacts. Winds up leaving my gauges not getting power, and sometimes having to bump the key a half dozen times til it'll crank.

Share this post


Link to post
Share on other sites

I did swap the relay with a known good one and no luck, we sent it to the dealer. I will update once they let us know what's going on with it. thanks guys

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...