The CCC operates in open and closed loop. When the engine is cold or just being started, the system is in open loop operation. This means it operates based on information stored in the CCC programming. When the engine is warm and all conditions are favorable (sensors operating) then it operates in closed loop, where fuel enrichment is based on information from the oxygen sensor.

A unique feature of the Chrysler Combustion Control Computer system is its ability to calibrate itself. The Auto Calibration Circuit compares information with the oxygen sensor to see if it is the same as pre-programmed information would be under the same conditions. If these 2 sources of information do not agree (due to temperature or altitude variations) the computer will adjust its memory to compensate. This calibration takes place at idle speed and around 55 miles per hour during steady cruising.

The electronic Spark Advance circuit is similar to other Chrysler Corp. vehicles. It provides no advance at idle or up to 1000 RPM, provides pre-programmed advance at other engine speeds, and adds additional advance based on engine load and throttle position. A single pick-up distributor is used, with no mechanical advance system.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Combustion Control Computer (CCC)

Use the Manual With the Right Hardware

When to See a Mechanic