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Re: P1A10, Another "Stop Safely Now" Thread
Originally Posted by Hippo the Hybrid
(Post 271569)
S. Keith, thanks, another great insight.
"Something to consider - you can hear when the engine is loaded and charging the battery. If you need to park the car again for an extended period, you could initiate the rmode balance function and then terminate it when the engine stops charging the battery. This should ensure the battery is at a higher state of charge." If an owner were to do this, what higher SOC range would you expect to see? Is there any negative aspect of terminating "rmode" prematurely? |
Re: P1A10, Another "Stop Safely Now" Thread
Originally Posted by S Keith
(Post 271568)
SOC is maintained around 50%. Battery efficiency is near 100% around 50%. If SOC was at 100%, you couldn't charge the battery when you hit the brakes.
The HV battery is just a energy recovery and release system. It's primary function is to capture kinetic energy via regenerative braking and release it during acceleration when the gas engine is most inefficient.
Originally Posted by S Keith
(Post 271568)
DEL_MOD_V is the single most relevant item for battery health. With batteries that appear to be healthy, I routinely see values of .19 or .25. This number represents the largest deviation between the measured cell groups. If you actually have a failed cell, this number will be over 1.0V. It's a good idea to also check it 24 hours after the car has been idle in the Key-ON Engine-OFF state.
Originally Posted by S Keith
(Post 271568)
Something to consider - you can hear when the engine is loaded and charging the battery. If you need to park the car again for an extended period, you could initiate the rmode balance function and then terminate it when the engine stops charging the battery. This should ensure the battery is at a higher state of charge.
Here is the full report run: https://cimg7.ibsrv.net/gimg/www.gre...9d4779f126.png Full BCM report |
Re: P1A10, Another "Stop Safely Now" Thread
I phrased that badly.
24 hr check process is simple: Park car. Let it sit for at least 24 hours. Key on/engine off Immediately check BCM parameters with Forscan Done The point is to get a snapshot of data after the BATTERY has sat for 24 hours without being charged. Disconnecting the 12V is what it says in the owner's manual - if 30 days or more. I don't entirely trust it. 10+ year old Cylindrical NiMH can have some pretty bad self-discharge, and yours discharged in only two weeks last time. That's not typical. Letting the balance function run for several minutes in preparation for an extended sit + 12V disconnect is your best insurance from having to repeat this exercise. |
Re: P1A10, Another "Stop Safely Now" Thread
Originally Posted by S Keith
(Post 271576)
I phrased that badly.
24 hr check process is simple: Park car. Let it sit for at least 24 hours. Key on/engine off Immediately check BCM parameters with Forscan Done The point is to get a snapshot of data after the BATTERY has sat for 24 hours without being charged. https://cimg1.ibsrv.net/gimg/www.gre...29f7b20f7a.png |
Re: P1A10, Another "Stop Safely Now" Thread
Negligible SoC/voltage drop and Delta_mod_v still .13.
Still perplexed by the discharge in 2 weeks. Maybe, if you have a habit of attempting to keep the car in EV mode as long as possible, it might have been at the bottom end of the operating range and more susceptible to discharge in a shorter period. |
Re: P1A10, Another "Stop Safely Now" Thread
Originally Posted by S Keith
(Post 271595)
Negligible SoC/voltage drop and Delta_mod_v still .13.
Still perplexed by the discharge in 2 weeks. Maybe, if you have a habit of attempting to keep the car in EV mode as long as possible, it might have been at the bottom end of the operating range and more susceptible to discharge in a shorter period. P0A1F P0A1F-20 B12A5-60- Mode Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage - I have replaced two out of three in the front of the SUV. The last one is in the passenger side dash. I don't think this is related- but I have both Ice and Heat on Passenger and Diver so I am posting it anyway. |
Re: P1A10, Another "Stop Safely Now" Thread
P0A1F by itself often means a failure of the battery computer itself, but the -20 may indicate a bigger problem.
Confirm in the BCM section as you did in post #34. |
Re: P1A10, Another "Stop Safely Now" Thread
https://cimg4.ibsrv.net/gimg/www.gre...daf1f155c6.png
After sitting for 24hours. What are the chances the air door blender for the hybrid battery is out? The one all the way in the back of the suv? |
Re: P1A10, Another "Stop Safely Now" Thread
battery blend door has a specific code... B1239 IIRC.
Hmmm... P0A1F_31 indicates Yes fault. It's worth recording during a drive to include aggressive acceleration. See if the delta mod V value spikes when you hit it with a high current. |
Re: P1A10, Another "Stop Safely Now" Thread
Cleared DTCs before doing the acceleration test. I now have these:
https://cimg3.ibsrv.net/gimg/www.gre...d844f2c358.png Here is a link to a zero- seventy video of the BCM read out. https://streamable.com/4qxw21 |
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