2000 Cadillac DeVille - Page 6 - Answered Questions & Fixed issues

may be a wiring fault as there is power to the display , follow the wiring loom backwards and see if there are any trapped, damaged wires etc

http://www.cadillacforums.com/forums/northstar-engines-system-technical-discussion/136157-p0340-camshaft-position-sensor.html

This is what I found for the code. P0502

On the side of the intake manifold follow the plastic vent line from the canister to the intake manifold. It usually is within a few inches of the test port which has a green cover on it.

You may have a torque converter not locking. At low engine load conditions at hwy speeds to save gas the engine computer will tell the trans to lock the converter which results in lower rpm. Either the TCC solenoid is not locking the converter, or the PCM has failed and not sending signal to the TCC solenoid. If this has been going on over a week, im willing to bet the PCM has failed, otherwise a good one should catch the TCC if its not working and should throw a code. Its my best guess with no tools to know for sure. Good luck :)

I would say the simplest thing to do would be to stop by an auto audio shop and he could print you a copy off...because in order for them to install an aftermarket radio they have to by.pass the factory amp and they need that diagram to do so...and Google the cadillac form that also might be a good lead

You may need to replace the abs computer.

Shift B solenoid faulty. If replacing one then I suggest replacing shift A solenoid as well. They're located in the lower vavle body of tranny. Hope this helped.

EGR is the purge valve.

With a special puller.

Need more info. Year, engine, etc. Reg y does not tell me anything.

if fuses are ok it can be a flasher relay

Your going to work on your own vehicle? I would guess your not, or you wouldn't be asking the question,in which case, why is it not at a shop If the pump is in fact not working properly, then your polluting the air & wasting fuel The check light & any codes you may have, do not indicate a need to replace any parts, until the parts are component tested & fail,repair shops don't tell you that & in may cases test nothing & throw parts at it & fail, like folks with no knowledge working in their driveway

Do you have the head lights on when you check the fuse?

big job, have to drop the gas tank-sometimes you can remove the rear seat and there is an access door to get to the pump with out removing the tank, but not all gm have this-

Bank and sensor location. Bank 1 refers to the back of cylinders that contain cylinder #1. Bank two refers to the other bank of cylinders that do not contain cylinder #1. Sensor 1 refers to the upstream O2 sensor or the O2 sensor before the catalytic convertor. Sensor 2 refers to the downstream O2 sensor or the sensor located after the Catalytic convertor. I hope that helps, let me know if you have any other questions, good luck.

remove dash to access hvac module rmove core

You can register on autozone's website and get access to basic repair info including wiring diagrams. The problem is going to be the wiring diagrams are filed under the component not the area of the car. So the fuel pump wiring is listed under fuel or engine management, the lights are under lights, and so on.

Look at the wires coming into the radio, check for an inline fuse.

have your alternator rechecked it could be bad even tho its is new this is very common .