Poodlejockey Posted February 22, 2015 Share Posted February 22, 2015 Have an 2011 Mack Chu mp8 start in morning and start to drive engine shut down light will come on but no buzzer stays on 2 to 10 seconds and goes off debates engine but does not shut off. After warms up a bit works fine all day oil pressure good coolant good temps all good . Take to dealer they say lights not on so they don't know what's wrong wtf Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/ Share on other sites More sharing options...
Macktech689 Posted February 22, 2015 Share Posted February 22, 2015 High crankcase pressure will turn the shutdown light on also, possibly the CCV canister isn't working properly at low temperatures. You may need to start driving when the oil temperature is a little higher. Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-280207 Share on other sites More sharing options...
j_martell Posted February 22, 2015 Share Posted February 22, 2015 I didn't move the Granite until at least 150* coolant and oil temp was attained.....same goes for the POS V***o i drive now....or my Jetta for that matter. Nothing likes to be cold Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-280211 Share on other sites More sharing options...
Poodlejockey Posted February 22, 2015 Author Share Posted February 22, 2015 Ha I don't move till temps are at least 150 . How do I check high crankcase pressure Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-280221 Share on other sites More sharing options...
Macktech689 Posted February 22, 2015 Share Posted February 22, 2015 Crankcase pressure cant be monitored by the driver, Tech Tool software can read it, all dealers have this software Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-280224 Share on other sites More sharing options...
Poodlejockey Posted February 22, 2015 Author Share Posted February 22, 2015 Guess it's off to the Mack dealer on Monday is there a filter or something in there that needs to be serviced Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-280228 Share on other sites More sharing options...
TRH Posted March 6, 2015 Share Posted March 6, 2015 Check the crankcase and oil pressure sensors behind the ecm for leaks. They can intermittently fault and cause it when the ecm sees no oil pressure for a sufficient amount of time.Dealer should be smart enough to check all this stuff, if you didn't get it fixed ask for a printout of all the dtcs when they hooked to it and see what they see. Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-281644 Share on other sites More sharing options...
manolumber Posted April 8, 2015 Share Posted April 8, 2015 This is ridiculous, if not a misunderstanding, for a certified Mack dealer. They should be able to hook up to the tractor and read both active (light on) and inactive (light off) trouble codes and get a clue as to what might be happening. Try again, but if you hear the same response, find a new shop. Quote Link to comment https://www.bigmacktrucks.com/topic/39031-engine-electronics/#findComment-285916 Share on other sites More sharing options...
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