Sanmaster 2.1

[DJay]

Yet another new user ?.

Anyone have the decoding key for all the functions this thing has? Heh heh ... I've figured out most of em, but some are throwing me for a loop.

IAC is one. Dunno what that means! Can't remember the others. Maybe i'll jot em all down next time i'm in the car....

Anyone?

TIA

 

[Chris Cornett]

Check here

http://www.geocities.com/rad87gn/tech/scanmaster.html

 

[DJay]

Chris; thx for the link. While it was very informative, it didn't tell me what half of the functions meant.

Maybe it's because I have a scanmaster 2.1 instead of 2.0?

Anyone have a link that lists all of the functions of 2.1?

TIA.

 

[OKTurbo]

Try this link at ramchargers.com

http://www.ramchargers.com/RamNews/Translator/index.htm

If you have any specific questions...just ask away...

John

 

[DJay]

well here's one:

What in the world are the cc's (i've heard them referred to as cross counts) and what do they mean to me?

TIA

 

[OKTurbo]

cc's are the O2 sensor cross counts. It lets you see how active the O2 sensor is.

The fuel injection system works by reading the MAF (Mass Air Flow) sensor to detect how much air is entering the engine....the O2 sensor on the exhaust measures (roughly) whether the mixture is rich or lean. The computer is continuously monitoring these sensors and making adjustments to the fuel injector (pulse width) to maintain the proper air/fuel mixture.

The stock O2 sensor is what is generally referred to as a "narrow band" sensor. It will not give you a very good A/F ratio...it acts mostly as a switch....letting the computer know "rich" or "lean"

Each time the O2 sensor detects a change from rich to lean it "crosses" the set point....each one of these rich/lean crossings is a "cross count".

The data comes out of the ALDL port to your Scanmaster at the rate of about one reading every 1.5 seconds. In this 1.5 second time span you should see the cc's number increase by around 15-20 counts. The cc numbers will start at 0 and count up to 255 then start all over again at 0.

When the O2 sensor starts to get "lazy"....usually lead fouling or age...the cc numbers will start to slow down. This is when you know that you need to put in a fresh O2 sensor.

Whew......hope that all made sense...

John

 

[DJay]

made total sense. thx very much for the info.

so if i don't see the cc's rising around +25 / frame i should consider replacing the o2 sensor; correct?

 

[OKTurbo]

+25 for each frame of data on the scanmaster is pretty quick.....you probably won't see the cc's move that fast unless you're driving down the road when the sensor is hot. At idle the O2 sensor will cool off a bit and the numbers will slow down.

I don't worry about it until the numbers really start slowing down...say 0-5 for each frame.

The O2 cc's aren't a number you really tune the car by, but they give you a good reference to the condition of the O2 sensor.

John