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Guest Message by DevFuse

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Won't run in EV mode, ICE kicks in immediately.

EV Mode ICE MPG

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27 replies to this topic

#21 OFFLINE   ErlandsonR

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Posted 18 January 2019 - 12:33 PM

I've noticed the same problem on my 2010 Fusion Hyb. (owned since June '09) It came on rather suddenly, starting in Oct. '18. Local dealer can't find any fault codes related to the EV function. I notice that high voltage battery takes and holds charge but can't supply enough power to drive the electric motor in EV mode. I also note it can assist the ICE mode. I wish there would be an high voltage battery health test roughly equivalent to ten one for the 12 V battery. Ford doesn't seem to have one as far as I can tell. Anyone have suggestions?


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#22 OFFLINE   Automate

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Posted 18 January 2019 - 12:42 PM

Anyone have suggestions?

 

http://forscan.org it can read the status of all the car's modules including the high voltage battery


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#23 OFFLINE   murphy

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Posted 18 January 2019 - 12:43 PM

It can't be too bad or the engine wouldn't start at all.  The engine is started by the HVB powering one of the electric motors to bring the engine up to the proper rpm and then the fuel injectors are turned on.  The car does not have a traditional starter motor or an alternator.



#24 OFFLINE   Automate

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Posted 18 January 2019 - 04:54 PM

 

Yes, but the power needed to start the ICE is tiny compared to power needed to accelerate the whole car.

 

Look how little is available to move the car

BatteryPower


Edited by Automate, 18 January 2019 - 04:56 PM.


#25 OFFLINE   lolder

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Posted 18 January 2019 - 07:26 PM

That's where it is when the car's stopped. That being said, it appears that cells are shorting out with age reducing the voltage. The voltage determines how fast the car can be driven in EV as it has to be greater than the voltage produced by the motor when it's turning called "back EMF" ( electro-motive force, ie. voltage. )  I think once cells short, the battery doesn't recondition or balance the cells anymore making the problem worse. I had three events in 2017-18 where the HVB was very much lower in the morning than when left the night before eventually allowing only one division of EV power available instead of three.


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#26 OFFLINE   Rob

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Posted 18 January 2019 - 07:34 PM

I've noticed the same problem on my 2010 Fusion Hyb. (owned since June '09) It came on rather suddenly, starting in Oct. '18. Local dealer can't find any fault codes related to the EV function. I notice that high voltage battery takes and holds charge but can't supply enough power to drive the electric motor in EV mode. I also note it can assist the ICE mode. 

 

May I ask how many miles you have on your FFH?

 

Rob


2010 Silver Fusion Hybrid

#27 OFFLINE   Automate

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Posted 18 January 2019 - 08:50 PM

That's where it is when the car's stopped.

 

Hardly matters.  Here it is 100% battery and 20 mph.

 

BatteryMoving


#28 OFFLINE   lolder

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Posted 18 January 2019 - 11:33 PM

Yeah that's 1/2 a division about what mine was doing before it went to my grandson last year. I could coax it up to about 35 mph tops. Maybe 2-21/2 divisions when new. I forget. This is symptomatic of shorted cells/lower voltage. The system still tends to keep the HVB at about 1/2 charged on the gauge. As long as the car runs you can still use it. The mpg will degrade somewhat mostly at lower speeds where it won't cycle between ICE and EV much.


Edited by lolder, 18 January 2019 - 11:36 PM.

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