P1444 Code driving me nuts..

[steveo]

Hey eveyone

Thanks for all your feedback, my little mk1 is sitting parked atm with the following errors P1648 P1644

This issue is messing with my temp reading with my obd2c&c gauge reading -30 battery temp

This is a very strange issues where ive had the temp display at 24degress and then back to -30

Just to be clear, ive just recently changed the ptc strip resistor to a 82ohms 1% resistor (another member test 85ohms and was not issue with the ptc strips)

For the 4 oem temp sensor i put all 4 temp sensor wires in parrallel and am using now a 2.5k 5% resistor to trick the battery temp at always 24degrees

I dont know if the temp mods have caused something to go wrong but it hard for me to tell

I originally ran the 4 stock oem termal sensors from the stock pack with the ptc strip resistor at 24 ohms, this worked fine during summer months, however with the temp coming close to 0 degrees i noticed less assist and regen, this is why i modified the sensors with fixed resistors to simulate a fix temp

I have a spare mcm and bcm that ive modded for peters 33% hack, however i will unmod it to try to get things running fine first

Ill keep you guys posted, thanks for all your feedback

-steveo

[AbCaRed00]

DTC P1644 is MOTSTA Signal Malfunction [ a 6-9 DTC flash code]

Depending if the DTC flash for the 1648 is 6-4, or 7-5, it could alternatively be a BCM or a MCM 'communication circuit problem' so maybe check the number of DTC flashes to see.

[Eli]

I'm not sure if it relates to your codes, but something is wrong with the way you've got the temp probes set up, the OBDIIC&C should be reading whatever temp you have the resistance set to.

It sounds like having the four thermistors in parallel might be the problem. They're each supposed to have their own resistance, and the value is averaged.

Putting a 10k ohm resistor in place of each thermistor will make the computer think the battery is room temperature, and should display such on the OBDIIC&C.

[uhtrinity]

The thermistors should all have a common ground, with dedicated signal line for each. The thermistors are also of the standard variety.

[steveo]

Originally Posted by Eli

I'm not sure if it relates to your codes, but something is wrong with the way you've got the temp probes set up, the OBDIIC&C should be reading whatever temp you have the resistance set to.

It sounds like having the four thermistors in parallel might be the problem. They're each supposed to have their own resistance, and the value is averaged.

Putting a 10k ohm resistor in place of each thermistor will make the computer think the battery is room temperature, and should display such on the OBDIIC&C.

I will be doing this tonight i will report back.

Thanks


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[steveo]

10k resitor 1% is solder/wired in where the original oem 4 thermistors where.

System now functioning properly, ill report back in a week if this solves the strange problem


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[steveo]

So i haven't gotten the p1658 error over the last couple days of (THANK GOD!!)

However... i had the p1444 code show up today followed by the p1449 code comming on a moment after..

any ideas guys?... should i try a different ptc resistor value?... I've tried .24ohms & .82ohms.. and have seen the same errors with both resistors...

thanks
-steveo

[uhtrinity]

Is that 0.82 ohms or 82 ohms? Anything between 10 - ~ 350 ohms should be fine. Edit: found your post above where you said 82ohms, 1%. Btw, resistor tolerance doesn't matter in this case.

On those temp sensors, I would split them out as they are normally wired. A common leg, with each sensor having its own dedicated signal line. Better yet use real sensors instead of resistors. The only other thing, double check and make sure you don't have an open signal line. The PTC and sensor wiring is pretty simple.

[retepsnikrep]

Use the 4 oem sensors and put them into your A123 blocks. That's what I did.

P1444 is high voltage short circuit nothing to do with temp sensors.

P1449 can be four different issues.

You must read the blink codes to get the exact fault/s otherwise we are just guessing.

http://99mpg.com/Data/resources/down...nk_code_p1.gif

[uhtrinity]

When you did your custom battery pack did you split it and then run HV connections to the stock output panel. Mine is split almost 50/50% and works just fine.