kiev
Posts: 1165
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: No READY. P1A15 error. Condenser charge timeout.

Fri Mar 20, 2020 6:01 pm

That's some good troubleshooting, especially adding the heater.

i would guess that there is a ceramic capacitor (C227, C229, C231) that is leaking as the temperature goes up. i chased something like this in a Volvo fuel injection computer years ago.

Maybe you can repeat this and then use a can of cold-spray with a small tube tip to aim it at those parts one at a time to find the culprit. And check this on the resistors in the voltage divider if it is not a bad cap.

Good luck and let us know what you find.
kiev = kenny's innovative electric vehicle

Sidemips
Posts: 3
Joined: Fri Mar 20, 2020 10:15 am

Re: No READY. P1A15 error. Condenser charge timeout.

Sun Apr 12, 2020 2:24 am

Yesterday I had a chance to continue troubleshooting the issue with the P1A15 error when the car is hot.

At first I have to tell you I already had a "fix" last year for this issue based on the recommandations from a member from the German forum goingelectric, unfortunately that fix worked only for a while and due to the measured voltage drop which is temperature dependant, the measured Vcap go below the threshold and does trigger the error...again.

That "fix" consisted of a 4Mohm resistor soldered between pin one on the Nihon isolation amplifier board and the soldering point right in front (pin 2 of the SMD chip)

Image


So I removed this resistor (cause the error appears anyway) and I installed the MCU back in the car:

Outside temperature 25°C/77°F
V Batt: 353.7V from BMU
V Capacitor: 340V from MCU
P1A15 triggered in the ECU

I then decided to solder again the 4MOhm resistor but now with a second one on top (Requivalent = 2MOhm)

V Batt: 353.7V from BMU
V Capacitor: 356V from MCU
No errors
I applied more heat on the board with the fan heater, VCapp dropped to 354V then 252V but still no errors, I was able to switch off the car and put back in Ready several times.

Since the 4Mohm 0806 SMD format are tricky to solder, I ordered new 1206 SMD 2MOhm resistors, so will be able to do a better soldering job, will put the covers with sealant and declare a successful fix or workarround for my issue. :-)
Last edited by Sidemips on Sun Apr 12, 2020 8:58 am, edited 1 time in total.

kiev
Posts: 1165
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: No READY. P1A15 error. Condenser charge timeout.

Sun Apr 12, 2020 8:43 am

Thank you for sharing your test results and repair notes. The photo link requires an account, so i'm reposting it over here. That mod attaches to the inverting input on pin 2 of the op amp.

Image
kiev = kenny's innovative electric vehicle

Sidemips
Posts: 3
Joined: Fri Mar 20, 2020 10:15 am

Re: No READY. P1A15 error. Condenser charge timeout.

Sun Apr 12, 2020 9:00 am

Thank you for hosting the picture, and I edited my last post, so pin2 on the op amp ;)

kiev
Posts: 1165
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: No READY. P1A15 error. Condenser charge timeout.

Sun Apr 12, 2020 10:13 am

Would you happen to have a picture of the bottom of that board? Maybe it wasn't removed for the repair, but i would be interested to see if possible.

i now realize that ChristopheFR on mymiev is user: cvelec on the French electric vehicles site, and he has some great photos of his replacement of parts in making repairs.

[edit: the scaled-down High Voltage measurement is fed thru a 100k resistor on the bottom layer the ISA215 to the inverting input pin 2 of the op amp; there is another 100k feedback from Output pin 6 to pin 2; and a 50k on the non-inverting pin 3 to ground. So it is a unity gain inverting amplifier. By adding resistance on the top side in parallel with 100k input resistor, the effective gain can be increased Vout = -(Rf/Ri)*Vin , and it can be twiddled with to get some value such that it think Vcap is within the allowed limits for the precharge by the pack.

i measured the C227, C229 and C231 surface mount capacitors as 390 nF (100Hz) for a combined ~1.2 uF at the pin 1 input of the ISA215 board. They are in parallel with the little blue precision voltage divider resistor R221, which was 6.8k in the MCU that i have dismantled. So the rise time constant is ~0.72 sec and 3x is a little over 2 seconds. So i'm guessing that the ECU waits at least 2 seconds after precharge to sense the Vcap.

i suspect that one of those capacitors is leaking. It can be tested on the bench with a 30VDC power supply at the via by R220 and measure the voltage divider at pin 1 of the ISA board. then heat those capacitors and watch the voltage for drop.]
kiev = kenny's innovative electric vehicle

Stan051
Posts: 7
Joined: Wed Apr 29, 2020 2:29 pm
Location: Norway/Poland

Re: No READY. P1A15 error. Condenser charge timeout.

Sun May 03, 2020 11:50 am

Hi, I'm new here, but as I see the problem with the code P1A15 is quite old.
I have a question for you, gentlemen, if you can instead of coding the immobilizer after changing the used MCU, replace the EEPROM on the printed circuit board or rewind its contents. Does this EEPROM 24C64 contain the necessary data to start the car, or is it some other chip.

Stan051
Posts: 7
Joined: Wed Apr 29, 2020 2:29 pm
Location: Norway/Poland

Re: No READY. P1A15 error. Condenser charge timeout.

Sun May 03, 2020 11:57 am

I have one more problem with the P1A2B code. Have any of you ever repaired it.

JoeS
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Joined: Thu Dec 15, 2011 5:47 am
Location: Silicon Valley, California

Re: No READY. P1A15 error. Condenser charge timeout.

Mon May 04, 2020 8:58 am

Hi Stan051, welcome to the forum.

I presume you have access to the i-MiEV manual?

http://myimiev.com/forum/viewtopic.php?f=19&t=2802

For example, DTCP1A2B is called a Three-phase Line Error and is discussed starting on page 54D-448, although judging by your questions it sounds as though you're ahead of the game already and I realize the manual does not answer your first question.

Good luck, and sorry, I can't be of help. Perhaps some else?
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

Stan051
Posts: 7
Joined: Wed Apr 29, 2020 2:29 pm
Location: Norway/Poland

Re: No READY. P1A15 error. Condenser charge timeout.

Mon May 04, 2020 1:40 pm

Hi. I was able to flip the content of eeproms, after mounting the used MCU the car is driving great.
But still the original inverter has not been repaired. It's infected with the P1A2B code, I'm determined to fix it.
Out of curiosity, because the car is already functional,
and the disgust of defeat remained. Thank you all for your help. and greetings from Norway.

kiev
Posts: 1165
Joined: Sun May 03, 2015 7:15 am
Location: The Heart o' Dixie
Contact: Website

Re: No READY. P1A15 error. Condenser charge timeout.

Tue May 05, 2020 6:52 am

The troubleshooting for the P1A2B code checks for loose connections, faulty shaft encoder, or degraded high voltage insulation. and if those are not found at fault, then to replace the motor.

Since you have the car working with another MCU, that would seem to point that the motor is okay and the fault was within the MCU.

Since the code relates to the measurement of the 3 phase currents of the motor windings, i would think the current sensors might be faulty, so that is the first components to check. The sensors are in the top plenum, the excitation and signal conditioning circuits are in the bottom plenum. Have fun and let us know what you find is the culprit.
kiev = kenny's innovative electric vehicle

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