The HV battery test was done in service in Germany about 4 years ago and the battery had 95% capacity. Now the car switches to fully electric mode without a problem in a few kilometers of ride.
They also installed new MECS in the service - under the warranty. Since then, the car has gone 12,000 miles, only urban traffic.
For the last 3 months, the car has not gone. Then, a 12V battery was replaced, oil change and routine service check. The car was tested a week after the city (about 150 miles) - without any problems. Then it collapsed the day after I got home.

Does the water pump (MECS) still run when the engine is running or is it triggered by the HV battery temperature?
I checked it first, and when the engine was started, the liquid went back to the expansion vessel, so it was running.
But a few days later (I drove the car to Ford service - of course, They didnīt find the cause of the problem within a week) - I opened the vessel with a running engine, white foam on the surface, and no liquid flowing from the overflow - the pump did not run.

The FORD service has "discovered" that the "stop park safetly" does the hybrid drive control unit - but does not know why.

EDIT:
Thank you for all advice
The error caused the dirty battery air filter.

 

Ok guys, found this thread- good reading so far. The situation in which I encountered the 'SSN' message has a couple extra twists, and I'd be grateful if any of you experts would take a look and share thoughts-

Here's the data:

2009 FEH AWD 80k miles
Lives in the desert but grew up in the cold salty streets of Montreal (some rust on chassis)
Car parked overnight
Drove ~10 miles in the morning
Stopped for 30 mins
Drove back <1 mile
Driving up a VERY steep portion of road (~30 feet of road at max angle) (road out of China Date Ranch for any of you Mojave Desert people)
Sudden, strong smell, 'overloading electrical system' smell (according to handy/car-savvy passenger)
'Stop Safely Now' message
Power loss
Stopped within a few seconds of message occurring
Looked up message in manual
Left car on foot to find cell coverage to call roadside assistance
Returned ~10 minutes later, car started, no error message
Noticed that OBDII bluetooth plugin device had 'jumped' out of the data socket- it had been there for 6 months or so
Drove home gingerly...

Some Q's for your consideration:
Why did the car produce that 'electrical overheating' smell (if that's in fact what it was)?
Did the high angle road power requirement cause the electrical system to 'overheat'?
Might I have done any permanent damage to the HE system?
What should I do next to follow up?
Is it possible that the OBDII plug jumped out of the socket because of some large power surge??

Any other thoughts?
Thank you-
Kevin

 

I wonder if the OBD device was lose causing it to short which could cause an electrical burning smell. Take out the device and sniff it and see if it has a smell. I don't know but a shorting device could cause the computer to think there was a malfunction and shutdown. If so it probably only damaged the device and hopefully not the computer. May want to replace the device.

 

Hi,

I've posted here before about my 2008 FEH and its issues related to SSN and eventual MECS pump work. Very helpful. Now I have something new:

On Sunday night, I had to drive about 150 miles round trip in very heavy rain. The following evening when I got in my car to drive home, I got the dreaded SSN indicator on my dashboard.

I pulled over, turned off the car, and sat a few moments. I started up the car again and let it run. No more SSN. I saw the green electricity flow indicator on the dash but I decided to look at the menu to check the hybrid battery. According to the graphic, it was empty (the battery symbol was 100% white).

I remembered when I had the two battery fans replaced earlier this year, the battery was similarly empty when I pulled out of the dealership, so I sat a little while longer with the engine idling. Eventually the symbol slowly "filled" with green, I put it into drive and got home with out incident or SSN.

I didn't think much of it until I got in the car this morning and decided to check the hybrid battery level. It was all white again...empty. No SSN message and the engine ran fine, but it still worried me about the battery health.

Do adverse weather conditions affect the hybrid battery's ability to hold a charge? It has been very cold and wet this past week, so I wondered if that was a possible cause. Or, it could be that the battery always had behaved that way, and I just didn't notice it until the SSN warning?

Thanks for any experiences/insights,

Tom

 

Checked this out- smells extra plasticky now, and there's something rattling around inside, which wasn't the case before. That may be it.

 

Hi all,

153k miles, 08 FEH.

Codes:

P0A27
P0A7E
P0A81

&

B2290

Here is a brief rundown of symptoms:

-Constantly sounds like a fan is running in the rear section of the vehicle, even when environmental controls are off
-Intermittent low/no electric assist power (more and more frequent as time passes)
-Fuel efficiency has plummeted, down to < 22mpg now; three years ago it was between 27-31 mpg (we're in Florida so AC is on 9-10 months out of the year)
-rare, but occasionally: environmental system shuts off, fans and A/C, while running; turning the system off and back on fixes it


-what got me interested in chasing down the problem: a few weeks back, my family and I were getting read to return from vacation, I started the car and let it run, trying to let it cool down before we piled in, it took a bit longer to finish packing and the car sat running, in the heat and sun, for nearly a half hour. The engine **** off and I got the SSN message. Turning the car completely off and letting it sit for about a half hour did the trick, we all got back in and it drove like a champ all the way home. No SSN's since.

I am hoping the hive mind can lend some ideas! Thanks!

 

P0A81 indicates one of your cooling fans is inoperative. You can confirm this by removing the black ducting at the driver's side rear of the battery. The front half of the battery vent is the intake, and the rear half is the exaust. The intake is further divided divided into halves. The front half is for the left fan, and the back half is for the right fan. You should feel suction on both front halves. I suspect your right fan is inop.

P0A7E is battery over-temp.

P0A27 Hybrid Battery Power Off Circuit is also triggered by a hot battery.

B2290 is Occupant Classification System Fault (I would ignore).

Fan failure is reasonably common.

Your symptoms are consistent with a hot battery.

Your codes are consistent with hot battery and fan failure.

There's a TSB for P0A81:

https://www.tsbsearch.com/Ford/16-0118

Replace fan(s).

 

Hey Keith, thanks for the quick response. I'll get working on it and let you know how it goes.

 

Hello,

I was able to complete the fan replacement without incident. It seemed to improve things fairly significantly immediately following. Fuel efficiency, according to the FEH reading, went from ~21-22mpg to ~26-27mpg. Power at acceleration seemed improved as well. I cleared codes and was code free for awhile.

Since then, power at acceleration after startup is intermittently poor and, at times, really bad. A couple weeks ago I pulled codes and got this:

P0316 - Engine Misfire on Startup

After a week or so I cleared that code and am now getting:

P1000 - OBD Systems Readiness Test Not Complete

From the sleuthing I have done, the P0316 code is supposedly tough to diagnose without an accompanying code. I am hoping with the context of the previous issue and everything subsequent to that, there might be a reasonable jumping off point for moving forward.

Fuel efficiency is back down to ~24mpg.

Thanks again for helping try to keep my 13 year old hybrid going as efficiently as possible.

 

P1000 always occurs after you clear codes. It's the code that prevents emissions testing before the car is ready.

P0316 suggests the ICE may be ailing. How old are the spark plugs?

At this point, it's worth going through all the "tune up" items and assessing if work is needed.

Worth determining if the mpg is ICE or hybrid related. Steady cruise at highway speeds on flat terrain means the hybrid system is essentially disabled. If you can get good mileage in this scenario, it is likely hybrid related.

Critical your A/C is operating 100% up to spec. If it's not, the battery can get warm enough to drastically cripple its performance but not throw codes - cooling fans or not.

If you notice favorable performance right before sunrise, but worse performance during the day, that's likely heat related.

With Forscan you can also monitor battery state and make an assessment.