Engine lockdown All starter will do is click.

Battery cable or connections or starter . Voltage drop testing the starter circuit , view wiring diagrams to see what all is involved in the starting electrical circuit . What engine size ? 1.8l
Starter Voltage Drop
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size. Under system click on engine ,then under subsystem click starting .Click the search button then the blue links one at a time . Check the main battery cable to the starter ,if ok ,check control side . Starter relay , controlled by the PCM / ECM - engine computer .
VEHICLE RELAYS Testing from the relay base

if their is a check engine light have the code read ------no such thing as lock down mode you have limp mode which will let you limp vehicle home or to a shop or off road safely sounds like a transmission problem check fluid --look and smell if it looks burnt brownish and or smells burnt try a flush with a fluid and filter change may gey lucky ---look under vehicle and check the selector cable and connections sometimes disconnect or rot away lastely possible internal problem which would need a transmission specialist to look at

Using a 9/16 or 14mm wrench remove the lockdown bolt and lift the distributor out of the engine remembering to unplug the electrical connector

celunoid ?? SOLENOID ! Could be starter , test ! VOLTAGE DROP TESTING .

Starter Voltage Drop

What size engine ???
Starter Motor, 4.6L C1020
Lower right side of engine Starter Motor, 5.4L C1020
Lower right side of engine

Starter Motor Relay, 4.6L C166
Right rear of engine compartment C167
Right rear of engine compartment Starter Motor Relay, 5.4L C166
Right rear of engine compartment C167
Right rear of engine compartment

If your trying to adjust your alternator belt, you have to loosen all the lockdown bolts before you can adjust the alternator. When you get the right tension on the belt, tighten the lockdown bolts.

If the alarm is not factory fitted:
Trace wire out of the module which will lead you to the immobiliser.Wires from the ignition barrel will be conacted there.remove module and connect wires to start car.
Wire will be from ignition switch to starter
Join wires in red and it should start.

Have you had the battery tested or replaced ?
Checked for loose cables ?

The clicking is the solenoid on the starter

That could be bad or the starter it's self

Turn on the interior lights. Try to start the engine. If the starter solenoid clicks and , the interior lights doesn't change intensity, then you have to troubleshoot the starter. If the interior lights dims then something at starter or engine is jammed.
If you suspect anything wrong with the starter let me know, and a will tell you how to troubleshoot the starter.

check to make sure starter is not stuck out in engage position.

is it a rappid clicking if so bad batt. if single click bad starter rappid click somtimes mean dirty cables or bad ground single click is bad starter could be silanoid or contacks