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P0031 heater control circuit low


 
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c987long
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Age: 29
Joined: 16 Mar 2008
Posts: 733
Location: South bend, indiana

2001 Dodge Neon R/T

Post: #1   PostPosted: Wed Apr 26, 2017 6:47 am    Post subject: P0031 heater control circuit low Reply with quote

hello all, i have run into a headache with my 05 srt 4. I have recently been trying to resolve my issue with the heater control circuit low bank1 sensor 1 (upsteream). I have replaced the sensor (ntk 23159) I have also had a new wiring harness made from kinnettic creations. I have gotten the code to go away for a day but then it came back on. I have preformed an ohm test on the circuit as well and not found an issue. When it is working i can use my trinityh and see that the 02 htr sense voltage is ~5.39 and that the reference is ~12.23. I am really out of options at this point, i can only consider that there could be a fault on the ecu. I will be going through the wiring again later this week to make sure i didnt miss something. But i would love to hear other options or advice.
_________________
2001 neon r/t sold
98 sport turbo- built motor 2.0 ngc DOHC sold
05 neon srt-4 current

esteinmaier wrote:
We all know that an SRT4 wing is the Chuck Norris of car parts.

occasional demons wrote:

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occasional demons
Mr One World
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Age: 52
Joined: 03 May 2007
Posts: 19843
Location: Ashland, Ohio

2001 Dodge Neon ES

Post: #2   PostPosted: Wed Apr 26, 2017 8:03 am    Post subject: Reply with quote

Chris, copied this from reply on the .org...


occasional demons wrote:
FWIW:
FSM wrote:
Ground point G102 Left Front of Engine Compartment

NGC Controller - Has a common ground for the
heater in the O2S. 12 volts is supplied to the heater
in the O2S by the NGC controller. Both the upstream
and downstream O2 sensors for NGC are pulse width
modulation (PWM).
NOTE: When replacing an O2
Sensor, the PCM RAM memory must be cleared,
either by disconnecting the PCM C-1 connector or
momentarily disconnecting the Battery negative terminal.
The NGC learns the characteristics of each O2
heater element and these old values should be
cleared when installing a new O2 sensor. The customer
may experience driveability issues if this is not
performed.



Not sure what that has to do with the heater circuit, but whatever.

Does it lose or vary the 12 volt supply? Have you tried an alternate power feed to the heater inputs? You may need to get a 12 volt regultor, and externally power them to see if it cures it. That would be cheaper and simpler than replacing the factory PCM.

http://www.ebay.com/itm/5-pcsPositive-12-Volt-Regulator-1-5-amp-TO220-L7812-LM7812-78012-USA-Seller-/132138482103?hash=item1ec41139b7:g:zysAAOSwsW9Y1zgP


You could wire all 5 in parallel if the amperage is needed.

Running off of battery voltage may alter the heater output voltage, and still give you a code.

But for the cost and effort, this is a simple way to rule out the PCM supply side. It doesn't mean the input side/PWM is working correctly. :/

If the PWM driver is not regulating ground well enough, it could be the issue.

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Bill


2001 neon ES MTX with '02 R/T PCM
1999 neon 2.4 EDZ MTX
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