Stagea obd II low voltage

[thomasLait]

Hey guys I have a 2001 Nissan stagea vq25det, I don't have any engine lights and not really any issues running but I was curious to see if I could use my obd II scanner to find anything that was hidden and I plugged my scanner in and it just said "Low voltage cannot scan" does anyone know how to fix this or what this could be?

[GTSBoy]

Is the Stag even ODBII compatible?

[thomasLait]

16 hours ago, GTSBoy said:

Is the Stag even ODBII compatible?

Yes it is, the nm35 stagea has OBDII idk if the WC34 has it tho 

[Duncan]

It might have the right plug but not be real OBD, they used J-OBD and all sorts of other weird things over time.

Just checking...they ignition was ON when you tried this, right?

[MBS206]

On 11/05/2025 at 1:53 AM, thomasLait said:

Yes it is, the nm35 stagea has OBDII idk if the WC34 has it tho 

This is something to be careful of.

I did a bit of digging on the NM35, as I spend a lot of time on near brand new cars and CANBus related stuff, which uses the same "OBD2" plug for a fair chunk of making my life easy.

The NM35, does NOT support OBD2.

The data pin is actually on Pin3, which is a manufacturer specific pin, and requires Consult3 to connect to the NM35.
Your low voltage, is either because the NM35 doesn't have 12V to the constant power pin on the J1962 (OBD2) connector, OR, it is attempting the standard comms, (CanBus, K Line, etc) and can't see any voltage on those pins.

Some people have had success accessing SOME data from the vehicle on OBD2 specification, using a module that supports KPW. My assumption, like Duncan has stated, it will likely actually be JOBD, where there is some cross over with the OBD2 and JOBD standards.

Note, lots of "OBD2" dongles, do NOT support KPW, which is what you need for a lot of Japanese vehicles of this era (And even up until recent years!), EG, Subaru, Suzuki, etc. 

 

The end of this thread is probably worth a read, as some people did find a way to get a display up in the NM35 recently, looks like someone implemented all the stuff needed to make it work. (The right protocols).

 

Edited May 30 by MBS206
Add link to NM35 thread.