ZE0 Leaf 2012 Pump 1 DIY non standard replacement P31E9

[Markokk888]

So my ZE0 pump 1 finally gave up it blowed a 10a fuse and a P31E9 00C0 EV/HEV Water Pump 1 EVC-314 DTC appeared, so i was reading on this and another forums of this problem and the solutions didn't satisfied me. I am aware of this post : Water Pump 1 failure on 2012
Its great that some people find same exact replacement pumps for cheap but there isn't any anymore.
I'm not gonna pay from 150 to 300 to 1k to replace this pump it's just not worth the money anymore in my opinion, my leaf is from 2012 and to pay 1k for a dealer to replace my pump is unreal the other options are cheaper to do it yourself but not ideal. So i will get to the point, I'm thinking of replacing the old pump with a cheap 12v pump from any hybrid or ev that is same spec liters per minute pump, its plenty to choose from 20-30-50 euros as long as the liquid will flow it will do the job. Lets get back to the DTC, the original pump have a 4 pin connector i assume the car measures the rpm or have some PWM control's, the cheap pumps have non of that and have only 2 pins + - 12v and it will do the job without any questions. The leaf still gonna be wondering what the heck is going on and will still probably throw at you same DTC code, any suggestions how to get rid the DTC?. And trick the leaf in to thinking everything is fine ? Any info or schematic of how the original pump works or what the 4 pins do ?

 

[Cameron]

Here's the results for 12V water pump search in Ali Express.
https://www.aliexpress.com/w/wholes...2g0o.categorymp.auto_suggest.7.3896ZriZZriZ3x
If you have the original part, get the part number from it and enter it into Ali Express search bar.

 

[Markokk888]

Here's the results for 12V water pump search in Ali Express.
https://www.aliexpress.com/w/wholes...2g0o.categorymp.auto_suggest.7.3896ZriZZriZ3x
If you have the original part, get the part number from it and enter it into Ali Express search bar.

There is only generic ones nothing specific even with the part number. So im trying to get the generic one to work. The original have 4 pins and generic ones only + and - so the car still gonna throw a DTC.

 

[FinnishCoffee]

Looking at the EVC part of the service manual, the VCM has two wires going to each pump, with one being PWM control to the pump and the other being a tach signal back from the pump. Looking at the diagnosis information connecting those two together should make the VCM happy. To be sure, I’d put about a 100 ohm resistor between the wires to protect the VCM.

 

[sadsk]

I used this process to replace the pump in my 2011 Nissan Leaf without draining or replacing the coolant, and without losing much coolant: in my Leaf, the reservoir is much smaller and located differently than in this video, so it was possible for me to drain the reservoir and raise the pump above the level of the reservoir. After draining the coolant, remove the 2 bolts holding the coolant tank in place. Then unbolt the pump and pull the A/C line out of the clip attached to the pump bracket (if your car has A/C). To unbolt, use a ratchet & 10mm socket with a long extension or two or three. Also use a telescoping magnetic pickup tool to insure you don't loose the bolts after they are loose.






Tutuapp 9Apps

 

[Markokk888]

Well i found out in a process that no need to replace the pump the pump is not the problem, transistor inside the pump was failed, replaced the broken transistor from an old gpu and it works fine now. So thank you all for your help.

 

[EVPowers]

Congratulations on your repair.
In the picture can you point to or describe which resistor was the bad one?

Is it the one with BE6B43 in it in the first pic?

 

[Markokk888]

Congratulations on your repair.
In the picture can you point to or describe which resistor was the bad one?

Is it the one with BE6B43 in it in the first pic?

It's QN0404. But sad news it works on a bench but when installed same DTC and seems it still doesn't work, maybe the same part failed instantly idk. Fuse is fine. Tired of this crap, ordered used pump replacement for 50€ from Estonia. Seems legit price for crap like this. Maybe i will follow up on this, or if anyone wants to continue to troubleshoot this or make a guide how to install cheap non nissan part then your welcome to do so i will support that, because eventually the old parts will faill again.