Re: CCD bus
[Re: ditchdrift]
#1116010
11/18/11 04:30 PM
11/18/11 04:30 PM
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Joined: Sep 2005
Posts: 12,481 Chino Valley
RodStRace
I Live Here
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I Live Here
Joined: Sep 2005
Posts: 12,481
Chino Valley
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yep, usually bad connections, unless someone was hacking and slashing in there. Chrysler Collision Detection (CCD) Bus is how the computers (PCM,CAB {ABS}, BCM, IPC) 'talk' to each other. High speed 'blips' of voltage over a party line, with each computer picking up the signals meant for it. You will probably get confused the first few times through the manual. The BCM one is usually the one with Communication codes. Buried in the first few pages is the sentence (paraphrasing here) "Codes with an * (asterisk) in front of them are customer complaints." Like a customer is going to complain that the IPC is not getting a Bus signal! Anyway, try to pull codes and get a realistic trouble shooting chart to start with. BTW, if the (for example) Instrument Panel Cluster (IPC) is not communicating with the other modules, the OTHER modules wil report the lack of communication, NOT the IPC (It's not talking, remember?)
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Re: CCD bus
[Re: gtx6970]
#1116014
11/18/11 06:33 PM
11/18/11 06:33 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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The CCD bus is the comunication system between all the cars or trucks controllers. It makes for alot less wiring. Its like if the speed sensor is picked up by the TCM (trans controller) it can be bussed out and every other controller on the car now knows the vehicle speed so you dont have to hard wire each controller that needs to know speed. Thats why alot of newer trucks may have the oil pressure sensor monitered by the PCM and then the oil pressure is bussed to the cluster and so on. Its best to put a DRB on it because if it says No Bus the DRB will tell you if its a short or a short to battery or an open or what ever because if the bus is down the DRB will usually say why its down but of course it wont tell you what the problem is. There are some comon problems but I have had all kind of weird bus problems over the years. Good luck , Ron
Last edited by 383man; 11/18/11 06:36 PM.
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Re: CCD bus
[Re: Jim_Lusk]
#1116016
11/19/11 11:01 PM
11/19/11 11:01 PM
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Joined: Mar 2003
Posts: 18,678 Fresno, CA
Jim_Lusk
OP
I Live Here
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OP
I Live Here
Joined: Mar 2003
Posts: 18,678
Fresno, CA
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Ok, I got a good battery in there and cranked, no start. Dash reads "no bus", scan tool says no communication. All the dash lights light up when you turn the key to on, but the fuel gauge and voltmeter don't move. I checked continuity of the bus between the engine computer and CTM and it was good. I don't like how shallow the pins fit on the instrument cluster, but it looks like there is contact.
The connectors don't look real good at the engine computer and I'd still like to replace the underhood harness, but my junkyarding today turned up nothing. The odometer does flash a few times when you cycle the key on-off-on-off-on and then displays the no bus. The radio does work and so do the power windows and locks.
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