Go to: www.landiss.com/mixture.htm
Print it out!
Read it carefully paying particular attention to testing CA models under "static tests".
As a brief summary, when you turn the ignition on the duty cycle should indicate 85% for CA models.
Manipulate the X92 connector button (at the front of the battery compartment) as described to place the system in "test mode".
Start the engine and observe the duty cycle.