[usatracy]

I soldered together a NO2C vD1 and am having a hardware problem I think. Running a base tune using licensed TS, 36-1 crank wheel. Stats in TS indicate sparks and injectors are firing.
I have no LEDs when the board is running. I have an ardustim connected and it is sending crank signal and TS reports the rpm and changes when I do them.
TS reports a voltage alarm, I put a voltage gauge up in TS, 12 volts is the GREEN area for this gauge, but it is reporting a red area as 2.3 volts.
I am using a 12 volt lead acid battery that has 12 volts, at the 12 volt gnd gnd 5 volt unsoldered test ports on the NO2C board I have 12 volt battery voltage. If I just plug the NO2C to the 12 volt battery with no USB both the NO2C and ardustim power up off the 12 volt and run.
I suspect I have a bad component or a reversed component that prevents the 12 volts on the NO2C board from firing up the LEDS and spark and injector outputs.
Any idea where I should look on the board for something that would cause this failure ?
Thanks


https://imgur.com/a/ThntYEy

[usatracy]

I checked all the resistor network packs, I was told they are not polarity sensitive but each has a pin 1 and a square peg on the board and I followed that on 4 of them but I see that the one nearest the 6 big tall heat sink chips may be reversed (RN4) where pin 1 is on the opposite end, I was told this would not matter but now I wonder, it is a 4608X-102-102LF

http://www.mouser.com/datasheet/2/54/4600x-776645.pdf

[usatracy]

Refer to schematic, on one side of R10 I have 12.3 volts on the other side 2.534 does that sound right ?

I am trying to trace this 12 volt low voltage fail in TS. R10 is the first step into the A4 of the mega for battery reference.

I have 1.050 volts at CPU A1

http://www.mouser.com/datasheet/2/54/4600x-776645.pdf

[PSIG]

No problem, as shown in the datasheets in this image:

4608X-102-102LF.jpg (24.98 KiB) Viewed 1424 times

You can see reversing the part still does the same thing for each pair of pins.

If you were using a 4608X-101-xxx, then it would be a problem, as each circuit would try to use the common ground connection, passing through two resistors instead of one. Just to confirm - you do not have that type of part right?

It sounds like you're already doing this, but here is the NO2C Battery Reference Voltage circuit. You can trace all the connections, and verify you have correct test voltage at each point:

NO2C_BRV_circuit.jpg (34.83 KiB) Viewed 1420 times

The resistors R10 and R11 create a voltage divider, and with 12V in on R10, and divided by R11, the output to the CPU would be 2.449V. Use an online voltage divider calculator if necessary to find the value you should be reading for whatever specific input voltage you have.

[dazq]

From what you describe about the lack of output LEDs too , check you u have the correct board type selected, this is very important.

[usatracy]

no2c was always selected in tuner studio, still no luck with this

[usatracy]

Looks to me like 2.6v go into Pin3 of RN5 (my test points are the same side of r10 and r11 cant get to RN5 pin 3) and something really low comes out on pin4 of the same RN5 (test points ADC-4 Pin 3 and brv-cpu a1) typically 100mv which then drops to 6mv

RN5 is a resistor network
https://www.digikey.com/en/products/det ... LF/1089039

If 2.6v goes into pin 3 of the RN5 what should the expected output voltage be on pin 4 ?
It seems to be 100mv or so with a drop to 6mv or so all over the components on that side of the RN4 pin


c20 is also a low voltage imo

IC2 ADC Clamping Circuit
ADC-2 Pin 1- 5.105
ADC-1 Pin 2- 21 mv drops to 3mv
ADC-4 Pin 3- 200 mv drops to 6mv
Pin 4- gnd
ADC-5 Pin 5- 5.104v
ADC-3 Pin 6- 5.104v
ADC-6 Pin 7- 100mv drops to 4 mv
Pin 8- 5.103v

r10- 12.6v & 2.6v
r11- 2.6v & 0v

c19- 2.590v & 0
c20- 6.9mv & 0

brv-cpu a1- drops to 6mv

RN5
https://www.digikey.com/en/products/det ... LF/1089039

[usatracy]

the other question is, what does voltage tuner studio expect to see on brv-cpu a1 if the 12 volt battery is at 12 volts ?

TS reports like 2 to 3 volts on my 12 volt battery and that A1 is at like 6mv after it drains down a few seconds, was like 100 200 mv when probe is first attached.

[usatracy]

ok so partial progress, I resoldered that RN5 and now I have 12 volts in TS. There is 2.56 volts on the BRV CPU A1 pin for those wondering. Lead Acid battery is 12.43

Still no flashing LEDs though even though I am pumping 3,000 rpm in with the ardustim, I will look for the next bad solder place

[usatracy]

Since all 4 LEDs do not blink, the logical question is, on the NO2C board, does it REQUIRE that the spark plugs or injectors be plugged in before the LED will blink ? (eg LED out then output target must not be plugged in, diagnostic aid)