Scanmaster mode : cc

[lyonsd]

According to the instructions that came with my Scamaster 2.1, it is supposed to have the following modes:

• AF Mass airflow
• L8 Engine load
• bat Battery voltage
• int Integrator
• bL Block learn
• mph Road speed
• clt Coolant temp
• ats Air temp sensor
• r RPM
• tps Throttle position sensor
• iac Idle air control
• pl injector pulse width
• sp spark advance
• mal Malfunction code

When I'm on "iac" and hit the button to go to the next mode, instead of getting "pl" or "sp", I get "cc". And the numbers simply increment. For example, first it will show 04, then 08, then 11, then 17, etc... all the way up into the 200s. Then it will start again with low numbers (but not necessarily the exact same numbers as the previous cycle).

I see that a special prom (series Y or Z) is required for the "pl" and "sp" modes. But what is this "cc" mode?

thanks.

 

[Evans Ward]

O2 cross counts.

 

[lyonsd]

Originally posted by Evans Ward
O2 cross counts.

Thanks. What are O2 cross counts telling me?

 

[Evans Ward]

Someone correct me if I'm wrong but I believe the O2 cross counts will indicate a proper, working O2 sensor. Cross counts show continuous adjustment of proper A/F ratio from TPS by ECM. Not sure though what range the cross counts need to be within to make that determination? Maybe someone else can chime in here??

 

[Evans Ward]

lyonsd,

BTW.

Forgot to comment that I like your avator which matches the front plate on your GN.

 

[blackbuick87]

You need a special chip to use the pulse width and spark advance options. I dont know who would make a chip like that.

The cc's seem to go to 255 and then reset to 0. can someone explain the usefulness of this information?

 

[OKTurbo]

Most chip makers can change the ALDL data mode. You will have to have the chip reburned to do it though. There are about 5 different modes that can be viewed on the Scanmaster....but like everything, it's give and take. If you get the fast update mode you'll lose some of the other data. I have a page I printed out from somewhere that showed all the different options on ALDL data, but I can't put my hands on it right now. Hopefully someone will chime in and give you more info.

As far as the O2 cross counts (cc)....this tells you how active the 02 sensor is. The numbers start at 0 and go up to 255....then cycle again...and again. Each time the 02 sensors "switches" from rich to lean is call a crossing. The cc numbers let you know how many times it has switched rich/lean during the 1.5 second ALDL data cycle. As the 02 sensor fouls these numbers will slow way down....which means that it's time to change it out.

John

 

[Mr URL]

http://midwestracing.hostin.com/smdatadef.htm