Not getting diagnostics info from the diagnostics plug

look for your bad fuse and replace with a new one page 5-93 starts your fuse info in your owners manual https://www.carmanual.org/cadillac-owners-manuals/2004-cadillac-cts-owners-manual-1742/

We have discussed this yesterday--- I believe

You need professional help,not keep asking questions

Only a professional scan tool & checking factory info, to
(learn) about your vehicles Reduced Power issue, will get
to finding a problem

I told you to use the internet, to try & find & learn about it

I may have also told you to stop using it until resolved

that truck is equiped with an obd on board diagnostic the plug is below the dash just left of the steering wheel you can jump wire plug and get codes through dash board flashing chk eng light

You have a 4.6 single overhead cam engine in your 93 tw as that is what mine has but as you were told it is probably the catalatic converters getting plugged up with that many miles miles on her it wouldnt be surprised and as far as as the how to read diagnostic codes Auto Zone sells a scanner to do that for around 300.00 I wasnt impressed with the scanner so i returned it and got my money back then went on E-Bay and bought a Snap-On 2500 series scanner and bought the cartridge for it and read all the codes it was giving it then proceeded to fix my 93 tc ...problem was not the same as your tho letting you knopw where i bought my scanner so maybe you can too ...FYI.... the ABS brakes have a seperate hook-up that a regular scanner wont read another reason i returned the auto Zone scanner , this older snap-on will read both sets of diagnostic and there is one more item that uses its own diagnostics and that is the A/C controller you will find all infomation on how to obtain any codes to help repair it ....Sorry this is so long but i belive this info will help a lot of people owning lincolns and grand marquies and Crown vics with ATC or EATC..

yes the cat can be installed backwards especially if it is a universal fit style part
take the cat off and run the engine without it next

This is not good. Do not run the engine until after someone hooks a scanner to the computer plug and runs the diagnostic.

You can buy an adequate scanner for about $100. You can instead have it towed to someone with a scanner with part of that $100. Use your Autoclub if you have one.

Do not start the car or run the motor. The scanner plug has all the info you need to start diagnosing the problem.

TCC is torque converter clutch circuit which helps tranny shift smoother and is in front off tranny.
$250
Random cyl miss. Most likely bad plug wire or faulty coil pack $45
Transmision pressure switch sends info to computer about tranny pressure and the switch controls it. $400

If that is your only transportation you need to call other repair shops. Find out about towing fees and what diagnostic fees they have.

Before there were diagnostic scanners, there were Mechanics. Scanners come in all types and some will suggest possible solutions and others are tools which Mechanics use to find problems.

For instance, you are told you have fuel pressure. You are told they installed new spark-plugs. You were not told if the spark-plugs are getting electricity to fire. You were not told if the fuel injectors are getting electricity to allow gas to reach the cylinders. You can have fuel pressure but the fuel injectors must open to put gas into the engine.

A noid tester or plain testing light will show if the injectors are opening. A spray of starting fluid will also indicate if the engine is not getting fuel despite fuel pressure. It will try to run with starting fluid if it has spark.

When you find out whether it runs, if not, then check for spark if the starting fluid does not make a difference.

It is questionable whether new spark plugs were needed if installing them had no effect. Check other service places.

a compression check should be done to make sure that it is not a compression issue, also you can plug in a node light in place of the injector to see if the ECU is firing it off, then check for spark at the plug,

there is very little you can do by pulling out the ECU, most of the diagnostic work on the ECU is done through the OBDII port using a scanner,



hope this helps

It is under the dash on the drivers side, and yes there are certain pins that if shorted will start quick test and give the codes stored in the PCM