P1444 Code driving me nuts..

[steveo]

So my car is using a 50s 2p a123 battery...

Currently also have the bcm interceptor & bcm fooler installed also and running with no issues..

I noticed with the cold temp here dipping below 0 degrees... i was getting a
p1658 error..

I i have since fixed the p1658 error

I believe this was caused by a difference in temps between the 4 battery temp sensors & the ptc strip sensor...

I've bypasses the thermel sensors with resistors, for the 4 battery stick sensors.. I used 1 3k resistor.. brings the temp to 20+ degress on the obd2 gauge..

for the Ptc strip i used a .24ohm resistor to fake room temp there also..

I will have days.. i've noticed colder day where the p1444 code will come on.. and days where its a tad warmer where it doesn't at all.. i don't know if the p1444 has anything at all to do with my temp sensor mod... but it sure did eliminate the p1658 code...

by using fixed resistors i was able to also maintain full assist & regen power no matter the temp..

any ideas what it can be

thanks
-steveo

[retepsnikrep]

Originally Posted by steveo

So my car is using a 50s 2p a123 battery...

Is it really running already with this A123 pack? That's incredible?

Where are the build photos and questions.
Have you built and are running the/my bms without problems?
What software are you using if you are using my BMS?

You have done remarkably well to get it all working then without asking any other questions!!! Hat's off to you.

We really need to see full details of the assembly and construction of your A123 setup before we can answer questions about what may be wrong with it.

[uhtrinity]

.24 ohms sounds way to low for a PTC spoof. You should be able to run anywhere from 8 - ~390 ohms before getting a P1449 code. That low value might be the source of the code.

Also, PTC strips aren't used in temp calculations, only for emergency shutoff in the case of high heat (150F+). I have the four temp sensor spread over my custom pack and have had no issues with temp related codes.

PTC Strips

[retepsnikrep]

I concur with Mark re the ptc strips and you should not really spoof the 4 x temp sensors but put them in your A123 pack, then the stock BCM can give a level of protection and the OBDIIC&C gauge can also report the temperature.

[steveo]

Yes I have installed the battery!!

i've been very busy with my job on my end, however i will have time this long weekend to post some info..

With the cold weather dipping below 0 degrees i'm doing my best to pull of good numbers..

I will post more a bit later today herel...

some pics .. for now..

current install, more fixes to be done

[retepsnikrep]

Well done

Please start a new thread for your actual install and post some really good big pics on some sort of external hosting site.

Thanks and good effort!

Do you mean the temp is dipping below 0 degress celcius or Farenheit !!
Be more careful when charging the cells at low temp.

[steveo]

Originally Posted by retepsnikrep

Well done

Please start a new thread for your actual install and post some really good big pics on some sort of external hosting site.

Thanks and good effort!

Do you mean the temp is dipping below 0 degress celcius or Farenheit !!
Be more careful when charging the cells at low temp.

I meant 0 Degress sorry

What resistor values are you using to trick the ptc strips ? I'm gona give it one more try to fix this issue on the weekend..

is 3k resistor ok to trick the temp sensors at 20 degrees?

I will start a new thread shortly.

I will also try to get the current 32% hack done this weekend if possiblem, ordered the resistors.. excited on this hack!!

thanks
-steveo

[AbCaRed00]

Wondering here: Are you sure the code you saw was a P1658, [for that code indicates as an ETCS Control Relay 'ON' Malfunction, for an 'Electronic Throttle Control System'// Not certain but I thought all we had was just the cable vs. any 'by wire' throttle control. ]

At a guess, could the code above reported have been a misreading of the screen, i.e. reading a number '5' for a letter 'B' as in DTC P16B8 which would make for a 'Mode Signal Circuit High Input' IMA code??

If so, i add the material below just in case as it may be a possibly immediate safety hazard given the combination reported with a DTC P1444, a.k.a. High Voltage Short Circuit.
____________________
ref: Repair Manual, Advanced Diagnostics, page 316,
DTC P16B8 (06): MODE SIGNAL CIRCUIT 1 HIGH INPUT

The ECM (engine control module) sends the IMA control mode signals
(MAMOD1) to the MCM (motor control module) by the pulse width modulation (PWM) signal duty. The signal duty is converted into voltage via an integrator circuit in the MCM, and the CPU reads it as analog data. The duty that is used for control is set between 10 % - 90 % (equivalent to 0.5 V - 4.5 V), so it stays out of the range when a malfunction such as an open in the signal wire or a short to ground occurs. If the MCM reads voltage higher than a set range, an open in the signal wire is detected and a DTC is stored. ////
"ENABLE CONDITIONS CHART
The voltage converted in the MCM circuit is 4.741 V or more for at least 2 seconds." ///
[a full read of the diagnostics and charts around those pages would be good]

As P1444 code indicates as a High Voltage Short Circuit, and as the above P1658 may possibly have been misread with P16B8 indicating a possible short to ground, ... then perhaps check your wiring for a loose connection.
______________
fwiw: For a better protection of the wires passing through the holes, you could try cutting a length* of rubber hose [*matching the circumference of the hole] lengthwise, so to replace the light plastic wire loom dressing assumed used as seen in the pics circling the holes. The plastic may wear easily over time with vibrations and not bear up as well as the thicker rubber hose material.
Maybe good also to tape the wires too and cable-tie them down securely so there is no flexing possible to loosen connections and/or short etc.

Best success with the project!

[charlieinjax]

Nice Job, Steveo. A very sweet set up.

[Eli]

I did some testing recently and the P1449 IMA light wasn't thrown until 1000 ohms of PTC resistance.

Also, PTC resistance had no effect on assist/regen right up until the IMA light, which was surprising. The four thermistors did, however. Above ~120F, all assist/regen was cut off on any single thermistor. If any single thermistor became more than about 50 degrees warmer than the rest, the IMA light was thrown. However, if all four thermistors were the same temperature, no IMA light was thrown - all the way up to 170F!