Do you ever having experience on Check Hybrid System? Trying to get your nearest Service Center to fix and they just will get you to replace the whole Traction Battery. The costs of it will be as high as RM10k including labour charges. What had happened to me was the Toyota Service Center at Puchong claims that my warranty is already expired and also there are two missed service schedules. In order to replace the battery, I will need to pay my own rather warranty getting from Toyota. What they did not tell us is the battery actually NO ISSUE at all!
Thanks to Toyota, I finally dismentled the whole traction battery and what I found out was astonishing. Why? See the below images:
Try to notice the busbars. Almost every busbars are rusty.
These busbars are on another side on the battery.
Do you want to see more what is look like in between the nuts? Well, It is the residue of the reaction caused by our tropical climate. This is the front on the busbars that all the residue builts up causing the electrical charges are not efficient enough and making the battery weak.
This is the behind of the busbars. So, this explains why our traction battery getting weak and making the Check Hybrid System message on the screen.
What I had done to the busbars was cleaning them up with some solutions and soaking it. At the same time doing the battery balancing. Due to series of battery linking up forming 201.6v, over time the center of the cells weaken. What we need to do is try to charge up the batteries and equalized them. Due to lack of equipments, I had linked all the batteries terminals (-) to (-) and (+) to (+) and let them equalized themself for about 6 hours. Below image using MacGyver way to link the batteries up. Becareful when performing this. DO NOT short the batteries.
Below is the output from what I had measured from the traction batteries voltage. It indicates the center cells are very weak and both ends are having high voltage.
Next, after finish cleaning up the busbars, time to assemble back to the busbars rails. Not 100% clean but at least no more residue causing high resistance for the batteries.
The back of the busbars also bright and clean.
The busbars in macro view. Clean and shiny.
Time to put back all the covers. I didn’t lift up everything from the car during this process. What I had done was trying to disconnect as little connection as possible. This will give me less error.
I was using a cheap multimeter to measure the voltages of the batteries after finishing the balancing. This is what it should be 🙂
Want to see the real results after the assembly? I am using Torque Pro (From Google PlayStore) and a OBDII ELM327 plug into the Prius. It shows all the voltages are almost the same. The maximum differences is just about 0.1 volt. Before that, the voltage differences can up to 1.5 volts which is ridiculous.
After 30 days of driving, the message (Check Hybrid System) no longer appear and I am having back the feel of driving this Prius. The battery is like new and is the same original traction battery.
From this post, I hope can help others to save your penny and do not waste on getting new battery first. My car is about 8 years old. This battery should be able to last upto 15 years or more. Read this as I was doing the research before fixing this battery.
#prius #tractionbattery #priusbattery #hybrid #hybridsystemerror #hybridissue #toyota #obd #diyrepairprius #checkhybridsystem