OBD II Device

[Bob R]

Does an OBD II device have the capability to read out battery voltage
and charge / discharge current?

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Bob R <BobR@nospam.com> wrote:

Does an OBD II device have the capability to read out battery voltage
and charge / discharge current?

Depends on the car. I think it's more likely that you can get the
battery voltage. More recently (since roughly the mid-late 2000s), cars
have had a battery current sensor, so either the engine computer or the
body computer knows the battery current.

I don't think the current is one of the standardized parameters, so your
ability to read it may vary from car to car. I know that some consumer-
level scan tools allow you to load in a file from a PC that tells it how
to ask for some of the manufacturer-specific parameters and how to
interpret the numbers that it gets from the car.

Matt Roberds