Toyota alphard 2010 engine stalled and cannot exceed 40km/h

[celiagy]

Hey Guys, I have a toyota alphard 2010 right hand module. At the beginning of june, this car occurred a constant battery drain problem. Since I replaced the car head unit (replaced with a generic Android car unit on aliexpress) and the rear entertainment sunroof TV, I first suspected that the cause was the loss of power in these added electrical components. However, after inspection, it seems that this is not the cause. In addition, in mid-June (around June 14), the car suddenly could not exceed 40km/h when driving at high speed. No matter how you stepped on the accelerator, the problem still existed until it slid to the side of the road and stalled (happened 5 times per day  ). I will share with you my troubleshooting ideas and repair process in the next few weeks (hopefully it can be fixed as soon as possible). Since there are no dealers or repairmen who can repair JDM models in my area, I have to repair it myself. If you have encountered a similar situation or have any good ideas, please reply to this post to help me troubleshoot the problem. Thank you in advance for your help!

 

[celiagy]

Today I replaced the new costco kirkland 24F battery and the fault codes changed from engine fault codes + 4wd fault codes + vsf off fault codes to the following fault codes (ABS, anti-roll and vsf off fault codes + handbrake fault codes (even though I had released the brake, the light stayed on so I considered it a fault code)). I also polished and cleaned the battery connector and it seems that the engine stalling problem no longer occurs.

[Alphard Club]

The reason the car is not exceeding 40kms is because it is in limp home mode. The check engine light (CEL) would make that happen. By utting on a new battery probably reset the CEL. 

 

The battery may of been the issue in this case. To preserve the connections on the battery, add a dab of Vaseline on the connections. 

[Rojie]

AND check the connections at both ends of the battery leads !

[Gamith]

The terminals on my battery connections were not tight so i ended up getting some lead terminal covers and cutting them down to fit.

 

[celiagy]

Hey Steve, Roger and Paul. Thanks for your guys' replies. I used sandpaper and WD-40 to clean the electric contacts connecting the car to the battery, but the problem seems to still exist. Here is the photo:

[Rojie]

2 hours ago, celiagy said:

Hey Steve, Roger and Paul. Thanks for your guys' replies. I used sandpaper and WD-40 to clean the electric contacts connecting the car to the battery, but the problem seems to still exist. Here is the photo:

 

Even new batteries benefit from a full charging.

 

I would not be buying batteries from Costco, but you already have.

A smart charger is well worth the investment, especially in winter, especially where you live.

I have a Ctek (Scandanavian brand) which also can test the alternator.

 

So check the leads to the alternator also.

 

Yours is a much younger model than mine; but I did find the mood lights where very easy to leave on a low setting without even noticing. Check.

 

Parasitic current drain is difficult to find, so exploring other options is worthwhile.

There are battery isolator switches available but they are obviously only of temporary help.