[GTP Dad]

Place the open end wrench on the back of one of the cam lobes particularly on the opposite end of the cam. Gently rotate the nut on the gear end until the cam is solidly held and then loosen the gear.
The CPS is the crank position sensor. It tells the ignition when the crank is in the proper position to fire. It is really a magnetic trigger that simply senses when the piston is at top dead center during the compression stroke and then the computer receives a signal and tells the coil to fire. To replace it on the 2.0 liter engine is complicated and you should take it to a shop. If you want to do the replacement yourself, I suggest you get a Chiltons manual as it describes the process in detail. However, if you have a distributer then you don't have a crank position sensor and the only problem you may have is with the distributer itself and the ignition module that is located in the distributer.