jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

2014 RAV4 EV won't charge

I removed the on-board charger to replace the two 50A fuses. After reassembly, I am getting a "Cntctr State" error message. Could it be that one or both charging contactor switches failed as well and that is why the fuses blew? Or could it be a kill switch that did not get reassembled correctly so the power is cut by the system? Being a newbie (learning as I go), I now realize I should have spent more time checking the critical components before reassembly. Does anyone have any suggestions about what to look for before I disassemble to get the on-board charger out again? I used the Toyota diagnostic software and here is what I believe to be the relevant diagnostic information.

Trouble Code: P312F
Contactor Cut OFF Relay Connect Request: ON
Contactor Cut OFF Relay Status: ON
Cause of READY ON Failure: Shift Oper
Cause of Forced Charge Cancel: Cntctr State

Here are some pic's of the unit and diag data.
Trouble Code: https://1drv.ms/u/s!AtSKKmN-5msBg_YuSbT ... A?e=CJ4A4r
Diag Data: https://1drv.ms/x/s!AtSKKmN-5msBg_Y8Taq ... g?e=fAl4el
Pic1: https://1drv.ms/u/s!AtSKKmN-5msBg_Y6naC ... A?e=CYKw3d
Pic2: https://1drv.ms/u/s!AtSKKmN-5msBg_Y3heM ... Q?e=CCCp82
Pic3: https://1drv.ms/u/s!AtSKKmN-5msBg_YyxAk ... w?e=yX81aI
hokiematt
Posts: 69
Joined: Thu Nov 02, 2017 8:57 pm
Location: Salisbury, NC

Re: 2014 RAV4 EV won't charge

Were the charger fuses indeed bad?

Unfortunately diagnostics from the Toyota side of things yield almost nothing of use: the P312F code simply means that the Tesla side of things has a problem, and the gateway is requesting the malfunction indicator lamp (MIL).

One thing that has bitten me before: there's a high voltage interlock loop that includes the charger, and any interruption of this closed loop will keep the contactors from turning on. On the charger, there's a jumper between two terminals that completes this loop, that is located between the AC input and the DC output connector. Leaving this jumper off will cause a problem. It's also possible that while you had the unit apart for service that you may have disturbed an internal connection that is part of this circuit. Unplug the connector on the driver's side and check for continuity between pins 3 & 9 on the charger.
miimura
Posts: 1915
Joined: Thu Jan 17, 2013 11:13 pm
Location: Los Altos, CA

Re: 2014 RAV4 EV won't charge

I assume that you also pulled the HV Service Plug under the front passenger seat before pulling the charger from the car. Make sure that it is properly re-installed. There is also a fuse inside that plug. You should also check its resistance.
2012 Shoreline Blue #1462 w/JdeMO | 2018 Tesla Model 3 LR | 4.32kW Motech/Enphase PV Solar + 2x Powerwall 2 AC| Leviton EVB40 40A & Jesla Home Charging | 2015 e-Golf LE (returned)
alflash
Posts: 171
Joined: Sun Sep 03, 2017 3:46 pm
Location: Ukraine
Contact: Website

Re: 2014 RAV4 EV won't charge

jfletter wrote:I removed the on-board charger to replace the two 50A fuses. After reassembly, I am getting a "Cntctr State" error message. Could it be that one or both charging contactor switches failed as well and that is why the fuses blew? Or could it be a kill switch that did not get reassembled correctly so the power is cut by the system? Being a newbie (learning as I go), I now realize I should have spent more time checking the critical components before reassembly. Does anyone have any suggestions about what to look for before I disassemble to get the on-board charger out again? I used the Toyota diagnostic software and here is what I believe to be the relevant diagnostic information.
Trouble Code: P312F...
"Guessing" is not the best way to "treat"/repair...
First, you need to make a diagnosis of Tesla systems * (read codes, collect and analyze live data with IGN ON, Ready and Charge), state all the external signs of a malfunction.
And after analyzing the results, make a final diagnosis.

Remote diagnostics of the Tesla systems of this car (Date of First Use: 09/26/2014 Production Date: 06/22/2014) is available with this program
Image
For example,
https://alflash.com.ua/phpBB2/download/file.php?id=3349
Image
miimura wrote:I assume that you also pulled the HV Service Plug under the front passenger seat before pulling the charger from the car. Make sure that it is properly re-installed. There is also a fuse inside that plug. You should also check its resistance.
+
https://youtu.be/hZk9wLK3QI4
Russian fascists are killing the civilian population of Ukraine.
jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

Re: 2014 RAV4 EV won't charge

miimura wrote:I assume that you also pulled the HV Service Plug under the front passenger seat before pulling the charger from the car. Make sure that it is properly re-installed. There is also a fuse inside that plug. You should also check its resistance.
I did pull the HV plug prior to doing any high voltage work on the car. I will check the plug fuse and let you know if I find anything. Thank you for the info.
jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

Re: 2014 RAV4 EV won't charge

hokiematt wrote:Were the charger fuses indeed bad?

Unfortunately diagnostics from the Toyota side of things yield almost nothing of use: the P312F code simply means that the Tesla side of things has a problem, and the gateway is requesting the malfunction indicator lamp (MIL).

One thing that has bitten me before: there's a high voltage interlock loop that includes the charger, and any interruption of this closed loop will keep the contactors from turning on. On the charger, there's a jumper between two terminals that completes this loop, that is located between the AC input and the DC output connector. Leaving this jumper off will cause a problem. It's also possible that while you had the unit apart for service that you may have disturbed an internal connection that is part of this circuit. Unplug the connector on the driver's side and check for continuity between pins 3 & 9 on the charger.
I did make sure to replace the interlock loop. I will check continuity between pin 3 & 9. Thank you for the suggestion. I tried not to disturb anything inside the on-board charger except removing the screws so I could take the shroud off to replace the two blow 50A fuses. I saw what I think is a magnetic cut off switch to cut power when the lid is removed and made sure I replaced the lid in the same orientation. I am not sure what other internal connection I may have disturbed.
jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

Re: 2014 RAV4 EV won't charge

alflash wrote:
jfletter wrote:I removed the on-board charger to replace the two 50A fuses. After reassembly, I am getting a "Cntctr State" error message. Could it be that one or both charging contactor switches failed as well and that is why the fuses blew? Or could it be a kill switch that did not get reassembled correctly so the power is cut by the system? Being a newbie (learning as I go), I now realize I should have spent more time checking the critical components before reassembly. Does anyone have any suggestions about what to look for before I disassemble to get the on-board charger out again? I used the Toyota diagnostic software and here is what I believe to be the relevant diagnostic information.
Trouble Code: P312F...
"Guessing" is not the best way to "treat"/repair...
First, you need to make a diagnosis of Tesla systems * (read codes, collect and analyze live data with IGN ON, Ready and Charge), state all the external signs of a malfunction.
And after analyzing the results, make a final diagnosis.

Remote diagnostics of the Tesla systems of this car (Date of First Use: 09/26/2014 Production Date: 06/22/2014) is available with this program
Image
For example,
https://alflash.com.ua/phpBB2/download/file.php?id=3349
Image
miimura wrote:I assume that you also pulled the HV Service Plug under the front passenger seat before pulling the charger from the car. Make sure that it is properly re-installed. There is also a fuse inside that plug. You should also check its resistance.
+
https://youtu.be/hZk9wLK3QI4
Thank you. I am having trouble locating the Tesla Diagnostic software. Or are you saying that RAV4EV can communicate with Tesla's remote diagnostic system? I did pull the HV service plug and will double check that I in cleaning inserted and also check the plug's fuse. Thank you for the advice.
alflash
Posts: 171
Joined: Sun Sep 03, 2017 3:46 pm
Location: Ukraine
Contact: Website

Re: 2014 RAV4 EV won't charge

jfletter wrote: ... I am having trouble locating the Tesla Diagnostic software. Or are you saying that RAV4EV can communicate with Tesla's remote diagnostic system? ...
Remote diagnostics of RAV4EV Tesla systems (three different methods) has been available since 2019 :)
Last edited by alflash on Tue Mar 22, 2022 12:53 am, edited 1 time in total.
Russian fascists are killing the civilian population of Ukraine.
jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

Re: 2014 RAV4 EV won't charge

Ok, partial success and a really stupid trip up.

I was checking the HV plug as everyone suggested and noticed that the one of the pins was bent. I checked the plug and something had dropped over the pin receptacle preventing the pin for connecting when installed. After carefully removing the object and bending the pins back, I reinstalled the plug. Also, I checked the plug resistance and it seemed fine.

I then used TechStream to clear the P312F error and it went away. I plugged the charge cable in, turned off the car and it started charging. Less than a minute later charging stopped. When I checked the problem it was another P312F error. I had to top of the battery coolant because it had pumped down.

A new message on the dash said "Check Power Steering System".

I removed the charge cable, turned the car off then back on. The P312F error cleared again without coming back.

When I tried to charge again, I noticed that the charger would click on and off in about 5 to 10 second intervals several times until charging would stop. Of course the P312F error reappeared.

If no one has suggestion, I will equipment that equipment that alflash is suggesting to we can get to the Tesla diagnostics.

Thanks again everyone and I appreciate any more suggest on how to further narrow down the problem. The new "Check Power Steering System" error is, of course, concerning but it hadn't popped up before I starting having these problems.
jfletter
Posts: 12
Joined: Sun Feb 06, 2022 9:43 pm

Re: 2014 RAV4 EV won't charge

alflash wrote:
jfletter wrote: ... I am having trouble locating the Tesla Diagnostic software. Or are you saying that RAV4EV can communicate with Tesla's remote diagnostic system? ...
Remote diagnostics of RAV4EV Tesla systems (three different methods) has been available since 2019 :)
alflash, I will have the parts I need to give you remote access to my RAV today. I need to solder the CAT5 cable to the ODB2 connector, configure my router, and schedule time with your team. I had filled out your online form a month or two back but did not get a reply. What is the best way to communicate, I assume not on this forum.

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