indy-tech seems to be away at the moment, so I will jump in here and answer your question in the mean time.
You will need a special scan tool for normal reading of codes on this system. The ABS/TCL system can NOT be scanned with a basic scantool.
Now the upside, is that you can scan the ABS system yourself by grounding one pin on the diagnostic connector with a short wire. This will cause the system to display the ABS codes as flashes on the dash board ABS light. This will not get TCL specific codes, though, only shared codes between both systems... it may be able to detect your issue if it is on the ABS side however (both lights come on if there is a fault in either system)
To do this, you will need a short piece of wire, and connect it between pins 1 and pin 4 of the diagnostic connector (where you hook up your scan tool).
Turn the ignition key on, and the ABS flight will begin flashing at you... a long flash followed by two short flashes would indicate a 12, for example. It will display all codes then repeat when it is finished.
Get the codes from the system, and then one of us will be able to assist you in more detail regarding what could be causing your fault(s).
To help you with the pin connections, use the following diagram below:
Note that if no codes are displayed, odds are your fault will be in the TCL specific side of the system (throttle body, etc), and will require a factory scan tool to determine the causes.