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Contributor

Re: Cat C15 dont start on battery but start on Air

Thanks Dave,

This engine is on board our ship crane at Thailand, I explained our engineer on board to check this unswitched power, he will check and revert.  during my conversation, i understand that even though the engine is cranking good but voltage dip on 24V is happening due to starting moter load, possibly this dip in voltage not sufficient un-switched power to ECM?? if this could be the one of the cause, I can install another power supply from ship power to provide power to this terminal.  This is just a thought at this point of time and I am sharing with you.  now vessel will check and inform me.

 

thanks and best regards
K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

Unswitched battery to pins 1, 31, and 32 at the customer connector.
Contributor

Re: Cat C15 dont start on battery but start on Air

Thanks Dave

Serial number MCW02801  trus this what needed

 

thanks and best regard,

K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

Post engine serial number.
Contributor

Re: Cat C15 dont start on battery but start on Air

Thanks a Lot Dave,

Now I understand your point, I will get this checked.  this may be the problem.  I will get back after checks.

thanks for your time and attention

 

thanks and  best regards

K.Parimalam

Super Contributor

Re: Cat C15 dont start on battery but start on Air

Sorry, I should have clarified. The engine ECM requires both switched and unswitched battery power. If unswitched battery power is not present at specific terminals of the engine ECM, the engine may not start.
Contributor

Re: Cat C15 dont start on battery but start on Air

Hi Dave,
Very good morning. Thanks for your help. Battery polarity is correct, it start first time but not during 2nd stry. If we leave charge and after one day it start firsr time but second time it cannot. Battery is good, good cranking of engine is happening but not starting. On air start it start all the time.
Super Contributor

Re: Cat C15 dont start on battery but start on Air

Are you sure the unswitched battery positive connections have been made?
Contributor

Cat C15 dont start on battery but start on Air

Hi,

Cat C15 engine installed on crane at offshore start one time on battery after full charge, but dont start during 2nd start even battery is good and cranking is good.  But start all the time without fail when we use air start.  

 

starting motor o'hauled, to make sure the motor is okay

if we add additional battery it may start 2nd time but dont start after 2nd time even cranking is good

 

I feel by lowering some of ECM setting this problem could be resolved.  need opinion and suggestion

 

thanks and best regards

K.Parimalam