2nd Gen Non-Engine/Transmission "ccd" showing on overhead trip computer

[GaryKrahmer]

The other night I had to change the fuse that protects the taillights and dash lights because my black lab pup had chewed the trailer wiring harness and shorted out the circuit.

My indication that something was wrong was at 9 PM at night I fire up the truck to head home and I have no dashlights. I pull over and check and sure enough I have no taillights, but my turn lights and brake lights worked.

I found the problem easy enough due to the frayed wires hanging down from the back bumper. I cleared the mess good enough so it wouldn't short out again till I got home but in trying to find the right fuse I pulled two or three fuses from the fuse box in the front of the cab near the drivers door before I remembered the right fuse was under the hood.

Anyway, I found the right one and got home but the next morning when I fired up the truck my overhead trip computer read "ccd" I went through the process of clearing the readings and resetting it and it would give me correct readings but now every once in a while I'll look up when I'm driving and it will read "ccd" again. It will go back to normal and everything will work fine again.

This has been going on for a week!

Any Ideas?



Thanks

 

[Allnew2Me]

On my 01 this is the procedure for the self-test. Ignition switch off, press and hold the step and the metric buttons while you turn on the ignition (don't start). Continue to hold until the display goes into the test mode. All the elements will light up and go through the test. At the end you will see PASS-all is well, FAIL-the unit is bad, or

CCD-this means you need to have it scanned by a dealer with the DRB scanner to properly diagnose the problem.

 

[GaryKrahmer]

Thanks Allnew2Me.

My test returned the results of "CCd"

Looks like I'll have to have the shop look at it next time I take it in.



Thanks for the help!

 

[Mishkaya]

Usually that's a sign that it's not communicating with the PCM. Sometimes you will get lucky and it's just a bad connection at the overhead or a bad ground. It was the case for me anyway.

 

[Allnew2Me]

Raatler, try pulling the fuse again and letting it sit without power for a few minutes, who knows, maybe it will work. Or check the connections as mishkaya advised. I don't know if disconnecting the batteries for an hour would do anything but it might be worth a try, possibly it would clear the ECM, at least it is free.

 

[GaryKrahmer]

I did have to disconnect the computer a couple of months ago to replace the sunglass holder that had a broken clip. ($35 for that piece of plastic!! #@$%!)

Maybe I need to disconnect it again and spray the contacts.

I assumed it was the fuse thingy since I saw the problem right after my pup tried to eat my truck.

Anyone want a cute black lab puppy?



Headed out to the garage right now.



Thanks guys!

 

[fest3er]

On my 01 this is the procedure for the self-test. Ignition switch off, press and hold the step and the metric buttons while you turn on the ignition (don't start). Continue to hold until the display goes into the test mode. All the elements will light up and go through the test. At the end you will see PASS-all is well, FAIL-the unit is bad, or

CCD-this means you need to have it scanned by a dealer with the DRB scanner to properly diagnose the problem.

Technical note for the layman: the CCD acronym expands to 'Chrysler Collision Detect' bus. This refers to the data bus Chrysler used to transmit data among various components in the vehicle. 'Collision Detect' means, in computer terms, that a sending device will detect when the message it sent collided with the message from another device on the data bus; if it detects a packet collision, it will (probably) wait a random amount of time and send the message again. FWIW, this is how Ethernet originally worked (and may still work). CSMA-CD means Carrier Sense, Multiple Access, Collision Detect; Chrysler probably modified the concept some and dropped the first part.



Your error means that the unit is having trouble talking to other devices on the bus. If nothing else is showing an error (instrument cluster, antilock brake controller, PCM, etc. ), then the problem is likely localized to the CCD wiring between your overhead computer and where it attaches to the CCD bus.



Chrysler's CCD bus has nothing whatsoever to do with detecting and responding to a physical collision of the vehicle with some other physical object.