huggabean Posted May 15, 2014 Share Posted May 15, 2014 (edited) I'm getting an emergency shutdown warning light and subsequent engine shutdown. This problem has been intermittent, but now it is continuous and I can't get anywhere. Within seconds of startup the emergency shutdown light comes on and shortly after, the engine stops. It will restart immediately, but the same thing happens again. What should I be looking for? As mentioned in the heading, this is a 1995 Mack CL 700.ThanksEd Edited May 15, 2014 by huggabean Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/ Share on other sites More sharing options...
wheeler73 Posted May 15, 2014 Share Posted May 15, 2014 Low coolant sensor, oil pressure sensor, coolant level sensor. What code are you getting. You can pull the flash code using the set resume button with the cruise switch off. Count the flashes. There will be a slight pause between the first and second part of the code. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245519 Share on other sites More sharing options...
huggabean Posted May 15, 2014 Author Share Posted May 15, 2014 Hi Wheeler73Where should I be looking to see the code? I tried selecting both the resume/accel and set/ decal buttons with the speed control switch set to off. Should I be trying with the engine running, the switch on, or the switch off? There is an shutdown override switch, but it has never had any noticeable effect on anything.ThanksEd (huggabean) Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245563 Share on other sites More sharing options...
j_martell Posted May 15, 2014 Share Posted May 15, 2014 Key on, motor off, speed control (cruise control) switch off, push and hold the set/resume until the CEL starts to flash. Count the flashes. There will be a pause is the flash sequence, that's the break in the code. Ex: x-X where the "x" 's are the numbers of flashes. Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245608 Share on other sites More sharing options...
rolloffron Posted May 16, 2014 Share Posted May 16, 2014 i have a 95 cl 700 too,and it does the same darn thing,only if it's damp or rainy weather it's a 427 coolant is full,and oil full too, i don't get it. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245616 Share on other sites More sharing options...
wheeler73 Posted May 16, 2014 Share Posted May 16, 2014 The truck can be running also. The only time it will flash the codes is when the codes are active. The older harness are sometimes sensitive to moisture. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245653 Share on other sites More sharing options...
wheeler73 Posted May 16, 2014 Share Posted May 16, 2014 The shutdown override switch allows you an extra 30 seconds or so to pull the truck over before 7t shuts down. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245654 Share on other sites More sharing options...
jnr_ate Posted May 18, 2014 Share Posted May 18, 2014 oil pressure sensors are pretty common fault but can be intermittent. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245913 Share on other sites More sharing options...
huggabean Posted May 18, 2014 Author Share Posted May 18, 2014 The oil pressure sensor seems to be the answer, at least for now. After my last post, I inspected connections and checked the location of likely sensors. When I unplugged the sensor on the oil filter housing I got an electronic malfunction light, but the shutdown didn't happen. Borrowed the sensor from another engine and it has been OK since. Hope it continues. This has been an intermittent problem since before I started running this truck, so it will take time to be totally confident in this cure.Thanks to everyone who jumped in.Ed Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245958 Share on other sites More sharing options...
j_martell Posted May 18, 2014 Share Posted May 18, 2014 The truck can be running also. The only time it will flash the codes is when the codes are active. The older harness are sometimes sensitive to moisture.Good to know...Huggabean: Glad you got it fixed....maybe....for now lol Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-245962 Share on other sites More sharing options...
jnr_ate Posted May 20, 2014 Share Posted May 20, 2014 you need to constantly clear your codes and record to get an idea. good work. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-246219 Share on other sites More sharing options...
Dlake Posted March 7, 2019 Share Posted March 7, 2019 I have a 1996 ch600 that ran good brought into shop to change injectors and a few wires in the hood for shorts and now I’m not getting any power to the injector pump and can’t figure it out checked and change all I could think of.Anyone have any help I would appreciate it. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-417513 Share on other sites More sharing options...
JoeH Posted March 15, 2019 Share Posted March 15, 2019 On 3/7/2019 at 8:05 AM, Dlake said: I have a 1996 ch600 that ran good brought into shop to change injectors and a few wires in the hood for shorts and now I’m not getting any power to the injector pump and can’t figure it out checked and change all I could think of.Anyone have any help I would appreciate it. Start a new thread. No one's going to see your problem hijacked into someone elses problem. Recheck the work done in the shop. Something probably got kicked standing on the frame to change injectors. Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-418194 Share on other sites More sharing options...
JesusBiondi Posted May 7, 2021 Share Posted May 7, 2021 hello .. I have a Mack RD 2001 I changed the water pump and the shutdown sensor started to sound, a loud and annoying beep, so I walked until I got to the parking lot, the problem was that when I changed the water pump the mechanic did not filled the full coolant tank, it was 2 gallons of coolant missing, when putting what was missing ready, the shutdown sensor turned off, that is, the tank should never lack coolant because the sensor turns on, I hope this helps you thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35710-1995-mack-emergency-shutdown-problem/#findComment-473500 Share on other sites More sharing options...
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